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National
United States Regulations
46 CFR PART 56—PIPING SYSTEMS AND APPURTENANCES




Title 46: Shipping





PART 56—PIPING SYSTEMS AND APPURTENANCES


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Authority: 33 U.S.C. 1321(j), 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; E.O. 12777, 56 FR 54757, 3 CFR, 1991 Comp., p. 351; Department of Homeland Security Delegation No. 0170.1.

Source: CGFR 68–82, 33 FR 18843, Dec. 18, 1968, unless otherwise noted.

Subpart 56.01—General
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Note: See §50.15–10 for general adoption of standards of the ANSI (American National Standards Institute). The printing of portions of the “American National Standard Code for Pressure Piping, Power Piping,” ANSI-B31.1, is with the permission of the publisher, The American Society of Mechanical Engineers (ASME) International, Three Park Avenue, New York, N.Y. 10016—5990. The adoption of this standard ANSI-B31.1 for pressure piping and power piping is subject to specific limitations or modifications as described in this part. Those requirements in ANSI-B31.1 which are not referred to in this part are adopted without change. Table 56.01–5(a) sets forth a general reference to various paragraphs in ANSI-B31.1 which are limited, modified, or replaced by regulations in this part.

§ 56.01-1 Scope (replaces 100.1).
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(a) This part contains requirements for the various ships' and barges' piping systems and appurtenances.

(b) The respective piping systems installed on ships and barges shall have the necessary pumps, valves, regulation valves, safety valves, relief valves, flanges, fittings, pressure gages, liquid level indicators, thermometers, etc., for safe and efficient operation of the vessel.

(c) Piping for industrial systems on mobile offshore drilling units need not fully comply with the requirements of this part but must meet Subpart 58.60 of this subchapter.

[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGD 73–251, 43 FR 56799, Dec. 4, 1978]

§ 56.01-2 Incorporation by reference.
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(a) Certain standards and specifications are incorporated by reference into this part with the approval of the Director of the Federal Register in accordance with 5 U.S.C. 552(a). To enforce any edition other than the one listed in paragraph (b) of this section, notice of the change must be published in the Federal Register and the material made available to the public. All approved material is available from the sources indicated in paragraph (b) or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202–741–6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.

(b) The standards and specifications approved for incorporation by reference in this part, and the sections affected are:


American National Standards Institute (ANSI)

11 West 42nd Street, New York, NY 10036

ANSI B1.1–82 Unified Inch Screw Threads (UN and UNR Thread Form) 56.60–1; 56.25–20 ANSI B1.20.1–83 Pipe Threads, General Purpose (Inch) 56.60–1 ANSI B1.20.3–76 (reaffirmed 1982) Dryseal Pipe Threads (Inch) 56.60–1 ANSI B16.1–75 Cast Iron Flanges and Flanged Fittings, Class 25, 125, 250 and 800 56.60–1; 56.60–10 ANSI B16.3–85 Malleable Iron Threaded Fittings, Classes 150 and 300 56.60–1 ANSI B16.4–85 Cast Iron Threaded Fittings, Classes 125 and 250 56.60–1 ANSI B16.5–81 Pipe Flanges and Flanged Fittings 56.25–20; 56.30–10; 56.60–1 ANSI B16.9–86 Factory-Made Wrought Steel Buttwelding Fittings 56.60–1 ANSI B16.10–86 Face-to-Face and End-to-End Dimensions of Ferrous Valves 56.60–1 ANSI B16.11–80 Forged Steel Fittings, Socket-Welding and Threaded 56.30–5; 56.60–1 ANSI B16.14–83 Ferrous Pipe Plugs, Bushings, and Locknuts with Pipe Threads 56.60–1 ANSI B16.15–85 Cast Bronze Threaded Fittings, Classes 125 and 250 56.60–1 ANSI B16.18–84 Cast Copper Alloy Solder Joint Pressure Fittings 56.60–1 ANSI B16.20–73 Ring-Joint Gaskets and Grooves for Steel Pipe Flanges VIII, Division 1, Pressure Vessels, 1986 with addenda 56.15–1; 56.15–5; 56.15–10; 56.25–5; 56.30–10; 56.30–30; 56.60–15; 56.60–1; 56.95–10 Section IX, Welding and Brazing Qualifications, 1986 with addenda 56.70–5; 56.70–20; 56.75–20; 56.0–1 ANSI B16.24–79 Bronze Pipe Flanges and Flanged Fittings, Class 150 and 300 56.60–1 ANSI B16.25–86 Buttwelding Ends 56.60–1; 56.30–5; 56.70–10 ANSI B16.28–86 Wrought Steel Buttwelding Short Radius Elbows and Returns 56.60–1 ANSI B16.29–86 Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings—DWV 56.60–1 ANSI B16.34–88 Valves-Flanged, Threaded and Welding End 56.20–1; 56.60–1 ANSI B16.42–87 Ductile Iron Pipe Flanges and Flanged Fittings, Classes 150 and 300 56.60–1 ANSI B18.2.1–81 Square and Hex Bolts and Screws, Inch Series 56.25–20; 56.60–1 ANSI B18.2.2–87 Square and Hex Nuts 56.25–20; 56.60–1 ANSI B31.1–86 Power Piping 56.01–5 ANSI B36.10M–85 Welded and Seamless Wrought Steel Pipe 56.07–5; 56.30–20; 56.60–1 ANSI B36.19M–85 Stainless Steel Pipe 56.07–5; 56.60–1
American Society of Mechanical Engineers (ASME) International

Three Park Avenue, New York, NY 10016—5990

Boiler and Pressure Vessel Code:

Section I, Power Boilers, 1986 with addenda56.15–5; 56.15–10; 56.60–1; 56.60–1; 56.70–15; 56.95–10 56.15–1 Section VIII, Division 1, Pressure Vessels, 1986 with addenda 56.15–1; 56.15–5; 56.15–10; 56.25–5; 56.30–10; 56.30–30; 56.60–15; 56.60–1; 56.95–10 Section IX, Welding and Brazing Qualifications, 1986 with addenda 56.70–5; 56.70–20; 56.75–20; 56.85–10
American Society for Testing and Materials (ASTM)

100 Barr Harbor Drive, West Conshohocken, PA 19428–2959.

ASTM A 36/A 36M–97a, Standard Specification for Carbon Structural Steel 56.30–10 ASTM A 47–90 (1995), Standard Specification for Ferritic Malleable Iron Castings 56.60–1 ASTM A 53–98, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless 56.10–5; 56.60–1 ASTM A 106–95, Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service 56.60–1 ASTM A 126–95, Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings 56.60–1 ASTM A 134–96, Standard Specification for Pipe, Steel, Electric-Fusion (Arc)-Welded (Sizes NPS 16 and Over) 56.60–1 ASTM A 135–97c, Standard Specification for Electric-Resistance-Welded Steel Pipe 56.60–1 ASTM A 139–96, Standard Specification for Electric-Fusion (Arc)-Welded Steel Pipe (NPS 4 and Over) 56.60–1 ASTM A 178/A 178M–95, Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes 56.60–1 ASTM A 179/A 179M–90a (1996), Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes 56.60–1 ASTM A 182/A 182M–97c, Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service 56.50–105 ASTM A 192/A 192M–91 (1996), Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service 56.60–1 ASTM A 194/A 194M–98b, Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both 56.50–105 ASTM A 197–87 (1992), Standard Specification for Cupola Malleable Iron 56.60–1 ASTM A 210/A 210M–96, Standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes 56.60–1 ASTM A 213/A 213M–95a, Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes 56.60–1 ASTM A 214/A 214M–96, Standard Specification for Electric-Resistance-Welded Carbon Steel Heat-Exchanger and Condenser Tubes 56.60–1 ASTM A 226/A 226M–95, Standard Specification for Electric-Resistance-Welded Carbon Steel Boiler and Superheater Tubes for High-Pressure Service 56.60–1 ASTM A 234/A 234M–97, Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service 56.60–1 ASTM A 249/A 249M–96a, Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes 56.60–1 ASTM A 268/A 268M–96, Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service 56.60–1 ASTM A 276–98, Standard Specification for Stainless Steel Bars and Shapes 56.60–2 ASTM A 307–97, Standard Specification for Carbon Steel Bolts and Studs, 60,000 PSI Tensile Strength 56.25–20 ASTM A 312/A 312M–95a, Standard Specification for Seamless and Welded Austenitic Stainless Steel Pipes 56.50–105; 56.60–1 ASTM A 320/A 320M–97, Standard Specification for Alloy/Steel Bolting Materials for Low-Temperature Service 56.50–105 ASTM A 333/A 333M–94, Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service 56.50–105; 56.60–1 ASTM A 334/A 334M–96, Standard Specification for Seamless and Welded Carbon and Alloy-Steel Tubes for Low-Temperature Service 56.50–105; 56.60–1 ASTM A 335/A 335M–95a, Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service 56.60–1 ASTM A 350/A 350M–97, Standard Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components 56.50–105 ASTM A 351/A 351M–94a, Standard Specification for Castings, Austenitic, Austenitic-Ferritic (Duplex), for Pressure-Containing Parts 56.50–105 ASTM A 352/A 352M–93 (1998), Standard Specification for Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts, Suitable for Low-Temperature Service 56.50–105 ASTM A 358/A 358M–95a, Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe for High-Temperature Service 56.60–1 ASTM A 369/A 369M–92, Standard Specification for Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service 56.60–1 ASTM A 376/A 376M–96, Standard Specification for Seamless Austenitic Steel Pipe for High-Temperature Central-Station Service 56.07–10; 56.60–1; 56.60–2 ASTM A 395/A 395M–98, Standard Specification for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures 56.50–60; 56.60–1; 56.60–15 ASTM A 403/A 403M–98, Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings 56.60–1 ASTM A 420/A 420M–96a, Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service 56.50–105; 56.60–1 ASTM A 520–97, Standard Specification for Supplementary Requirements for Seamless and Electric-Resistance-Welded Carbon Steel Tubular Products for High-Temperature Service Conforming to ISO Recommendations for Boiler Construction 56.60–1 ASTM A 522/A 522M–95b, Standard Specification for Forged or Rolled 8 and 9% Nickel Alloy Steel Flanges, Fittings, Valves, and Parts for Low-Temperature Service 56.50–105 ASTM A 536–84 (1993), Standard Specification for Ductile Iron Castings 56.60–1 ASTM A 575–96, Standard Specification for Steel Bars, Carbon, Merchant Quality, M-Grades 56.60–2 ASTM A 576–90b (1995), Standard Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality 56.60–2 ASTM B 16–92, Standard Specification for Free-Cutting Brass Rod, Bar, and Shapes for Use in Screw Machines 56.60–2 ASTM B 21–96, Standard Specification for Naval Brass Rod, Bar, and Shapes 56.60–2 ASTM B 26/B 26M–97, Standard Specification for Aluminum-Alloy Sand Castings 56.60–2 ASTM B 42–96, Standard Specification for Seamless Copper Pipe, Standard Sizes 56.60–1 ASTM B 43–96, Standard Specification for Seamless Red Brass Pipe, Standard Sizes 56.60–1 ASTM B 68–95, Standard Specification for Seamless Copper Tube, Bright Annealed 56.60–1 ASTM B 75–97, Standard Specification for Seamless Copper Tube 56.60–1 ASTM B 85–96, Standard Specification for Aluminum-Alloy Die Castings 56.60–2 ASTM B 88–96, Standard Specification for Seamless Copper Water Tube 56.60–1 ASTM B 96–93, Standard Specification for Copper-Silicon Alloy Plate, Sheet, Strip, and Rolled Bar for General Purposes and Pressure Vessels 56.60–2 ASTM B 111–95, Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock 56.60–1 ASTM B 124–96, Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes 56.60–2 ASTM B 161–93, Standard Specification for Nickel Seamless Pipe and Tube 56.60–1 ASTM B 165–93, Standard Specification of Nickel-Copper Alloy (UNS NO4400) Seamless Pipe and Tube 56.60–1 ASTM B 167–97a, Standard Specification for Nickel-Chromium-Iron Alloys (UNS NO6600, NO6601, NO6603, NO6690, NO6025, and NO6045) Seamless Pipe and Tube 56.60–1 ASTM B 171–95, Standard Specification for Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers, and Heat Exchangers 56.60–2 ASTM B 210–95, Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes 56.60–1 ASTM B 234–95, Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers 56.60–1 ASTM B 241/B 241M–96, Standard Specification for Aluminum and Aluminum-Alloy Seamless Pipe and Seamless Extruded Tube 56.60–1 ASTM B 280–97, Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service 56.60–1 ASTM B 283–96, Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed) 56.60–2 ASTM B 315–93, Standard Specification for Seamless Copper Alloy Pipe and Tube 56.60–1 ASTM B 361–95, Standard Specification for Factory-Made Wrought Aluminum and Aluminum-Alloy Welding Fittings 56.60–1 ASTM B 858M–95, Standard Test Method for Determination of Susceptibility to Stress Corrosion Cracking in Copper Alloys Using an Ammonia Vapor Test 56.60–2 ASTM D 635–97, Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position 56.60–25 ASTM D 1785–96b, Standard Specification for Poly (Vinyl Chloride)(PVC) Plastic Pipe, Schedules 40, 80, and 120 56.60–25 ASTM D 2241–96b, Standard Specification for Poly (Vinyl Chloride)(PVC) Pressure-Rated Pipe (SDR Series) 56.60–25 ASTM D 2464–96a, Standard Specification for Threaded Poly (Vinyl Chloride)(PVC) Plastic Pipe Fittings Schedule 80 56.60–25 ASTM D 2466–97, Standard Specification for Poly (Vinyl Chloride)(PVC) Plastic Pipe Fittings, Schedule 40 56.60–25 ASTM D 2467–96a, Standard Specification for Poly (Vinyl Chloride)(PVC) Plastic Pipe Fittings, Schedule 80 56.60–25 ASTM D 2665–97b, Standard Specification for Poly (Vinyl Chloride)(PVC)Plastic Drain, Waste, and Vent Pipe and Fittings 56.60–25 ASTM D 2863–95, Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-like Combustion of Plastics (Oxygen Index) 56.60–25 ASTM E 23–96, Standard Test Methods for Notched Bar Impact Testing of Metallic Materials 56.50–105 ASTM F 682–82a (1993), Standard Specification for Wrought Carbon Steel Sleeve-Type Pipe Couplings 56.60–1 ASTM F 1006–86 (1992), Standard Specification for Entrainment Separators for Use in Marine Piping Applications 56.60–1 ASTM F 1007–86 (1996), Standard Specification for Pipe-Line Expansion Joints of the Packed Slip Type for Marine Application 56.60–1 ASTM F 1020–86 (1996), Standard Specification for Line-Blind Valves for Marine Applications 56.60–1 ASTM F 1120–87 (1993), Standard Specification for Circular Metallic Bellows Type Expansion Joints for Piping Applications 56.60–1 ASTM F 1123–87 (1993), Standard Specification for Non-Metallic Expansion Joints 56.60–1 ASTM F 1139–88 (1993), Standard Specification for Steam Traps and Drains 56.60–2 ASTM F 1172–88 (1993), Standard Specification for Fuel Oil Meters of the Volumetric Positive Displacement Type 56.60–1 ASTM F 1173–95, Standard Specification for Thermosetting Resin Fiberglass Pipe and Fittings to be Used for Marine Applications 56.60–1 ASTM F 1199–88 (1993), Standard Specification for Cast (All Temperature and Pressures) and Welded Pipe Line Strainers (150 psig and 150 Degrees F Maximum) 56.60–1 ASTM F 1200–88 (1993), Standard Specification for Fabricated (Welded) Pipe Line Strainers (Above 150 psig and 150 Degrees F) 56.60–1 ASTM F 1201–88 (1993), Standard Specification for Fluid Conditioner Fittings in Piping Applications above 0 Degrees F 56.60–1 ASTM F 1387–93, Standard Specification for Performance of Mechanically Attached Fittings 56.30–25 ASTM F 1476–95a, Standard Specification for Performance of Gasketed Mechanical Couplings for Use in Piping Applications 56.30–35 ASTM F 1548–94, Standard Specification for the Performance of Fittings for Use with Gasketed Mechanical Couplings, Used in Piping Applications 56.30–35
Expansion Joint Manufacturers Association Inc. (EJMA)

25 North Broadway, Tarrytown, NY 10591

Standards of the Expansion Joint Manufacturers Association, 1980 56.60–1
International Maritime Organization (IMO), Publications Section,

4 Albert Embankment, London, SE1 7SR United Kingdom

Resolution A.753(18) Guidelines for the Application of Plastic Pipes on Ships 56.60–25
Fluid Controls Institute Inc. (FCI)

31 South Street, Suite 303, Morristown, NJ 07960

FCI 69–1 Pressure Rating Standard for Steam Traps 56.60–1
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. (MSS)

127 Park Street NE, Vienna, VA 22180

SP–6–85 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings 56.25–10; 56.60–1 SP–9–87 Spot Facing for Bronze, Iron and Steel Flanges 56.60–1 SP–25–88 Standard Marking System for Valves, Fittings, Flanges and Unions 56.15–1; 56.20–5; 56.60–1 SP–44–85 Steel Pipe Line Flanges 56.60–1 SP–45–87 Bypass and Drain Connection Standard 56.20–20; 56.60–1 SP–51–86 Class 150LW Corrosion Resistant Cast Flanges and Flanged Fittings 56.60–1 SP–53–85 Quality Standard for Steel Castings and Forgings for Valves, Flanges and Fittings and Other Piping Components—Magnetic Particle Examination Method 56.60–1 SP–55–85 Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components—Visual Method 56.60–1 SP–58–83 Pipe Hangers and Supports—Materials, Design and Manufacture 56.60–1 SP–61–85 Pressure Testing of Steel Valves 56.60–1 SP–67–83 Butterfly Valves 56.60–1 SP–69–83 Pipe Hangers and Supports—Selection and Application 56.60–1 SP–72–87 Ball Valves with Flanged or Butt-Welding Ends for General Service 56.60–1 SP–73–86 Brazing Joints for Wrought and Cast Copper Alloy Solder Joint Pressure Fittings 56.60–1 SP–83–87 Steel Pipe Unions, Socket-Welding and Threaded 56.60–1
Society of Automotive Engineers (SAE)

400 Commonwealth Drive, Warrendale, Pa 15096

J1475–84 Hydraulic Hose Fittings for Marine Applications 56.60–25 J1942–89 Hose and Hose Assemblies for Marine Applications 56.60–25

[CGD 77–140, 54 FR 40599, Oct. 2, 1989; 55 FR 39968, Oct. 1, 1990, as amended by CGD 88–032, 56 FR 35822, July 29, 1991; CGD 95–012, 60 FR 48049, Sept. 18, 1995; CGD 95–027, 61 FR 26000, May 23, 1996; CGD 96–041, 61 FR 50728, Sept. 27, 1996; CGD 97–057, 62 FR 51044, Sept. 30, 1997; CGD 95–028, 62 FR 51200, Sept. 30, 1997; USCG–1999–6216, 64 FR 53224, Oct. 1, 1999; USCG–1999–5151, 64 FR 67178, Dec. 1, 1999; USCG–2004–18884, 69 FR 58346, Sept. 30, 2004]

§ 56.01-3 Power boiler external piping (Replaces 100.1.1, 100.1.2, 111.6, 122.1, 132 and 133).
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(a) Power boiler external piping and components must meet the requirements of this part and §§52.01–105, 52.01–110, 52.01–115, and 52.01–120 of this chapter.

(b) Specific requirements for power boiler external piping and appurtenances, as defined in §§100.1.1 and 100.1.2, appearing in the various paragraphs of ANSI B31.1, are not adopted unless specifically indicated elsewhere in this part.

[CGD 77–140, 54 FR 40602, Oct. 2, 1989; 55 FR 39968, Oct. 1, 1990]

§ 56.01-5 Adoption of ANSI (American National Standards Institute) Code B31.1 for pressure and power piping, and other standards.
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(a) Piping systems for ships and barges shall be designed, constructed, and inspected in accordance with B31.1, the “Code for Pressure Piping, Power Piping,” of the ANSI (American National Standards Institute), as limited, modified, or replaced by specific requirements in this part. The provisions in the appendices to ANSI-B31.1 are adopted and shall be followed when the requirements in ANSI-B31.1 or the regulations in this part make them mandatory. For general information Table 56.01–5(a) lists the various paragraphs, etc., in ANSI-B31.1 which are limited, modified, replaced, or reproduced by regulations in this part.


Table 56.01-5(a)_Limitations and Modifications in the Adoption of ANSI-
B31.1 Code for Pressure and Power Piping
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Section or paragraph in ANSI-B31.1, and
disposition Unit in this part
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100.1 replaced by......................... 56.01-1.
100.2 modified by......................... 56.07-5.
101 through 104.7 modified by............. 56.07-10.
101.2 modified by......................... 56.07-10(a), (b).
101.5 replaced by......................... 56.07-10(c).
102.2 modified by......................... 56.07-10(d).
102.2.5(d) replaced by.................... 56.50-40.
102.3 and 104.1.2 modified by............. 56.07-10(e).
104.3 modified by......................... 56.07-10(f).
104.4 modified by......................... 56.07-10(e).
104.5.1 modified by....................... 56.30-10.
105 through 108 replaced by............... 56.10-1 through 56.25-20.
110 through 118 replaced by............... 56.30-1 through 56.30-35.
119.5.1 replaced by....................... 56.35-10, 56.35-15, 56.35-
35.
119.7 replaced by......................... 56.35-1.
122.3 modified by......................... 56.50-97.
122.6 through 122.10 replaced by.......... 56.50-1 through 56.50-80.
123 replaced by........................... 56.60-1.
Table 126.1 is replaced by................ 56.30-5(c)(3), 56.60-1.
127 through 135.4 replaced by............. 56.65-1, 56.70-1 through
56.90-10.
136 replaced by........................... 56.95-1 through 56.95-10.
137 replaced by........................... 56.97-1 through 56.97-40.
------------------------------------------------------------------------


(b) When a section or paragraph of the regulations in this part relates to material in ANSI-B31.1 Code (American National Standard Code for Pressure Piping, Power Piping), the relationship with this code will be shown immediately following the heading of the section or at the beginning of the paragraph as follows:

(1) (Modifies ___.) This indicates that the material in the ANSI-B31.1 so numbered for identification is generally applicable but is being altered, amplified or augmented.

(2) (Replaces ___.) This indicates that the material in the ANSI-B31.1 so numbered for identification does not apply.

(3) (Reproduces ___.) This indicates that the material in the ANSI-B31.1 so numbered for identification is being identically reproduced for convenience, not for emphasis.

(c) As stated in §50.15–10 of this chapter, the standards of the ANSI (American National Standards Institute) specifically referred to in this part shall be the governing requirements for the subject matters covered unless specifically limited, modified or replaced by other regulations in this subchapter. See §56.60–1(b) for the other adopted commercial standards applicable to piping systems which also form a part of this subchapter.

[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9978, June 17, 1970; CGFR 72–59R, 37 FR 6189, Mar. 25, 1972; CGD 73–254, 40 FR 40164, Sept. 2, 1975; CGD 77–140, 54 FR 40602, Oct. 2, 1989]

§ 56.01-10 Plan approval.
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(a) Plans and specifications for new construction and major alterations showing the respective piping systems shall be submitted, as required by subpart 50.20 of this subchapter.

(b) Piping materials and appliances, such as pipe, tubing, fittings, flanges, and valves, except safety valves and safety relief valves covered in part 162 of subchapter Q (Specifications) of this chapter, are not required to be specifically approved by the Commandant, but shall comply with the applicable requirements for materials, construction, markings, and testing. These materials and appliances shall be certified as described in part 50 of this subchapter. Drawings listing material specifications and showing details of welded joints for pressure-containing appurtenances of welded construction shall be submitted in accordance with paragraph (a) of this section.

(c)(1) Prior to installation aboard ship, diagrams of the following systems shall be submitted for approval:

(i) Steam and exhaust piping.

(ii) Boiler feed and blowoff piping.

(iii) Safety valve escape piping.

(iv) Fuel oil service, transfer and filling piping. (Service includes boiler fuel and internal combustion engine fuel piping.)

(v) Fire extinguishing systems including fire main and sprinkler piping, inert gas and foam.

(vi) Bilge and ballast piping.

(vii) Tank cleaning piping.

(viii) Condenser circulating water piping.

(ix) Vent, sound and overflow piping.

(x) Sanitary drains, soil drains, deck drains, and overboard discharge piping.

(xi) Internal combustion engine exhaust piping. (Refer to part 58 of this subchapter for requirements.)

(xii) Cargo piping.

(xiii) Hot water heating systems if the temperature is greater than 121 °C(250 °F).

(xiv) Compressed air piping.

(xv) Fluid power and control systems (hydraulic, pneumatic). (Refer to subpart 58.30 of this subchapter for specific requirements.)

(xvi) Lubricating oil piping.

(xvii) Refrigeration and air conditioning piping. (Refer to part 58 of this subchapter for specific requirements.)

(2) Arrangement drawings of the following systems shall also be submitted prior to installation:

(i) All Classes I, I-L, and II-L systems.

(ii) All Class II firemain, foam, sprinkler, bilge and ballast, vent sounding and overflow systems.

(iii) Other Class II systems only if specifically requested or required by regulations in this subchapter.

(d)(1) The drawings or diagrams shall include a list of material, furnishing pipe diameters, wall thicknesses, design pressure, fluid temperature, applicable ASTM material or ANSI component specification, type, size, design standard, and rating of valves, flanges, and fittings.

(2) Pump rated capacity and pump shutoff head shall appear on piping diagrams. Pump characteristic curves shall be submitted for all pumps in the firemain and foam systems. These curves need not be submitted if the following information is shown on the drawing:

(i) Rated capacity and head at rated capacity.

(ii) Shutoff head.

(iii) Head at 150 percent rated capacity.

(3) Standard drawings of the following fabrication details shall be submitted:

(i) Welding details for piping connections.

(ii) Welding details for nonstandard fittings (when appropriate).

(d–1) Plans of piping for industrial systems on mobile offshore drilling units must be submitted under subpart 58.60 of this subchapter.

(e) Where piping passes through watertight bulkheads and/or fire boundaries, plans of typical details of piping penetrations shall be submitted.

(f) Arrangement drawings specified in paragraph (c)(2) of this section are not required if—

(1) The location of each component for which there is a location requirement (i.e., shell penetration, fire station, foam monitor, etc.) is indicated on the piping diagram;

(2) The diagram includes, or is accompanied by and makes reference to, a material schedule which describes components in sufficient detail to substantiate their compliance with the regulations of this subchapter;

(3) A thermal stress analysis is not required; and

(4) A dynamic analysis is neither required nor elected in lieu of allowable stress reduction.

[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9978, June 17, 1970; CGFR 72–59R, 37 FR 6189, Mar. 25, 1972; CGD 73–251, 43 FR 56799, Dec. 4, 1978, CGD 77–140, 54 FR 40602, Oct. 2, 1989; CGD 95–012, 60 FR 48049, Sept. 18, 1995]

Subpart 56.04—Piping Classification
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§ 56.04-1 Scope.
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Piping shall be classified as shown in Table 56.04–1.


Table 56.04-1_Piping Classifications
------------------------------------------------------------------------
Section in
Service Class this part
------------------------------------------------------------------------
Normal.............................. I, II................. 56.04-2
Low temperature..................... I-L, II-L............. 56.50-105
------------------------------------------------------------------------


[CGD 72–206R, 38 FR 17229, June 29, 1973, as amended by CGD 77–140, 54 FR 40602, Oct. 2, 1989; CGD 95–012, 60 FR 48049, Sept. 18, 1995]

§ 56.04-2 Piping classification according to service.
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The designation of classes according to service is found in Table 56.04–2.


Table 56.04-2_Pressure Piping Classification
----------------------------------------------------------------------------------------------------------------
Pressure
Service Class \1\ (p.s.i.g.) Temp. (°F)
----------------------------------------------------------------------------------------------------------------
Class B and C poisons \2\....... I................. any............... and............... 0 and above.
I-L............... any............... and............... below 0.
II................ (\3\ )............ (\3\ )............ (\3\ )
II-L.............. (\3\ )............ (\3\ )............ (\3\ )
Gases and vapors \2\............ I................. above 150......... or................ above 650.
I-L............... above 150......... and............... below 0.
II................ 150 and below..... and............... 0 to 650.
II-L.............. 150 and below..... and............... below 0.
Liquefied flammable gases \2\... I................. above 150......... and............... 0 and above. \1\
I-L............... above 150......... and............... below 0.
II................ 150 and below..... and............... 0 and above.
II-L.............. 150 and below..... and............... below 0.
Molten sulphur.................. I................. above 225......... or................ above 330.
II................ 225 and below..... and............... 330 and below.
Cargo liquids Grades A through D I................. above 225......... or................ above 150.
\2\.
I-L............... above 225......... and............... below 0.
II................ 225 and below..... and............... 0 to 150.
II-L.............. 225 and below..... and............... below 0.
Cargo liquids Grade E........... I................. above 225......... or................ above 400.
I-L............... above 225......... and............... below 0.
II................ 225 and below..... and............... 0 to 400.
II-L.............. 225 and below..... and............... below 0.
Water........................... I................. above 225......... or................ above 350.
II................ 225 and below..... and............... 350 and below.
Fuels (Bunker, diesel, gasoline, I................. above 150......... or................ above 150.
etc.).
II................ 150 and below..... and............... 150 and below.
Lubricating oil................. I................. above 225......... or................ above 400.
II................ 225 and below..... and............... 400 and below.
Asphalt......................... I................. above 225......... or................ above 400.
II................ 225 and below..... and............... 400 and below.
Heat transfer oil............... I................. above 225......... or................ above 400.
II................ 225 and below..... and............... 400 and below.
Hydraulic fluid................. I................. above 225......... or................ above 400.
II................ 225 and below..... and............... 400 and below.
----------------------------------------------------------------------------------------------------------------







Flammable or Refer to specific requirements of part 40 of
combustible this chapter.
dangerous
cargoes.
Other dangerous Refer to specific requirements of part 98 of
cargoes. this chapter.
----------------------------------------------------------------------------------------------------------------

\1\ Where doubt exists as to proper classification, refer to the Commandant for resolution.
\2\ For definitions, see 46 CFR parts 30, 151, and 154. Note that the category ``B and C'' poisons is not used
in the rules applying to self-propelled vessels (46 CFR part 153).
\3\ Not permitted except inside cargo tanks approved for Class B and C poisons.


[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGD 73–254, 40 FR 40164, Sept. 2, 1975; CGD 73–96, 42 FR 49024, Sept. 26, 1977]

§ 56.04-10 Other systems.
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Piping systems and appurtenances not requiring plan approval may be accepted by the marine inspector if:

(a) The system is suitable for the service intended,

(b) There are guards, shields, insulation and similar devices where needed for protection of personnel,

(c) Failure of the systems would not hazard the vessel, personnel or vital systems, and

(d) The system is not manifestly unsafe.

[CGD 77–140, 54 FR 40602, Oct. 2, 1989]

Subpart 56.07—Design
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§ 56.07-5 Definitions (modifies 100.2).
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(a) Piping. The definitions contained in 100.2 of ANSI-B31.1 apply, as well as the following:

(1) The word piping within the meaning of the regulations in this subchapter refers to fabricated pipes or tubes with flanges and fittings attached, for use in the conveyance of vapors, gases or liquids, regardless of whether the diameter is measured on the inside or the outside.

(b) Nominal diameter. The term nominal diameter or diameter as used in this part, means the commercial diameter of the piping, i.e., pipe size.

(c) Schedule. The word Schedule when used in this part refers to specific values as given in American National Standards B36.10 and B36.19.

(d) Fittings and appurtenances. The word fitting and the phrase fittings and appurtenances within the meaning of the regulations in this subchapter refer to pressure containing piping system components other than valves and pipe. This includes piping system components whose function is to join branches of the system (such as tees, wyes, elbows, unions, bushings, etc.) which are referred to as pipe joining fittings, as well as components which operate on the fluid contained in the system (such as traps, drains, strainers, separators, filters, meters, etc.), which are referred to as “fluid conditioner” fittings. Thermometer wells and other similar fittings which form part of the pressure barrier of any system are included under this heading. Expansion joints, slip joints, rotary joints, quick disconnect couplings, etc., are referred to as special purpose fittings, and may be subject to such special design and testing requirements as prescribed by the Commandant. Refer to subpart 56.15 for design requirements for fittings.

(e) Nonstandard fittings. “Nonstandard fitting” means a component of a piping system which is not fabricated under an adopted industry standard.

(f) Vital system. A vital system is one which is essential to the safety of the vessel, its passengers and crew.

(g) Plate flange. The term plate flange, as used in this subchapter, means a flange made from plate material, and may have a raised face and/or a raised hub.

[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9978, June 17, 1970; CGD 77–140, 54 FR 40602, Oct. 2, 1989]

§ 56.07-10 Design conditions and criteria (modifies 101–104.7).
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(a) Maximum allowable working pressure (modifies 101.2). (1) The maximum allowable working pressure of a piping system shall not be greater than the internal design pressure defined in 104.1.2 of ANSI-B31.1.

(2) Where the maximum allowable working pressure of a system component, such as a valve or a fitting, is less than that computed for the pipe or tubing, the system pressure shall be limited to the lowest of the component maximum allowable working pressures.

(b) Relief valves (modifies 101.2). (1) Every system which may be exposed to pressures higher than the system's maximum allowable working pressure shall be safeguarded by appropriate relief devices. (See §52.01–3 of this subchapter for definitions.) Relief valves are required at pump discharges except for centrifugal pumps so designed and applied that a pressure in excess of the maximum allowable working pressure for the system cannot be developed.

(2) The relief valve setting shall not exceed the maximum allowable working pressure of the system. Its relieving capacity shall be sufficient to prevent the pressure from rising more than 20 percent above the system maximum allowable working pressure. The rated relieving capacity of safety and relief valves used in the protection of piping systems only shall be based on actual flow test data and the capacity shall be certified by the manufacturer at 120 percent of the set pressure of the valve.

(3) Relief valves shall be certified as required in part 50 of this subchapter for valves, and shall also meet the requirements of §54.15–10 of this subchapter.

(c) Ship motion dynamic effects (replaces 101.5.3). Piping system designs shall account for the effects of ship motion and flexure, including weight, yaw, sway, roll, pitch, heave, and vibration.

(d) Pressure temperature ratings (modifies 102.2). The material in 102.2 of ANSI-B31.1 is applicable with the following exceptions:

(1) The details of components not having specific ratings as described in 102.2.2 of ANSI B31.1 must be furnished to the Marine Safety Center for approval.

(2) Boiler blowoff piping must be designed in accordance with §56.50–40 of this part.

(e) Pressure design (modifies 102.3, 104.1.2 and 104.4). (1) Materials for use in piping must be selected as described in §56.60–1(a) of this part. Tabulated allowable stress values for these materials shall be measured as indicated in 102.3.1 of ANSI-B31.1, Tables 56.60–1 and 56.60–2(a).

(2) Allowable stress values, as found in the ASME Code, which are restricted in application by footnote or are italicized shall not be used. Where multiple stresses are listed for a material, the lowest value of the listing shall be used unless otherwise approved by the Commandant. In all cases the temperature is understood to be the actual temperature of the component.

(3) Where the operator desires to use a material not listed, permission must be obtained from the Commandant. Requirements for testing found in §56.97–40(a)(2) and §56.97–40(a)(4) may affect design and should be considered. Special design limitations may be found for specific systems. Refer to subpart 56.50 for specific requirements.

(f) Intersections (modifies 104.3). The material of ANSI-B31.1 in 104.3 is applicable with the following additions:

(1) Reinforcement calculations where applicable shall be submitted.

(2) Wherever possible the longitudinal joint of a welded pipe should not be pierced.

[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9978, June 17, 1970; 37 FR 16803, Aug. 19, 1972; CGD 73–254, 40 FR 40164, Sept. 2, 1975; CGD 77–140, 54 FR 40602, Oct. 2, 1989; CGD 95–012, 60 FR 48050, Sept. 18, 1995; CGD 95–028 62 FR 51200, Sept. 30, 1997; USCG–1998–4442, 63 FR 52190, Sept. 30, 1998]

Subpart 56.10—Components
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§ 56.10-1 Selection and limitations of piping components (replaces 105 through 108).
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(a) Pipe, tubing, pipe joining fittings, and piping system components, shall meet material and standard requirements of subpart 56.60 and shall meet the certification requirements of part 50 of this subchapter.

(b) The requirements in this subpart and subparts 56.15 through 56.25 shall be followed in lieu of those in 105 through 108 in ANSI-B31.1; however, certain requirements are marked “reproduced.”

[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9978, June 17, 1970]

§ 56.10-5 Pipe.
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(a) General. Pipe and tubing shall be selected as described in Table 56.60–1(a).

(b) Ferrous pipe. ASTM Specification A 53 (incorporated by reference, see §56.01–2) furnace welded pipe shall not be used for combustible or flammable liquids within machinery spaces. (See §§30.10–15 and 30.10–22 of this chapter.)

(c) Nonferrous pipe. (See also §56.60–20.) (1) Copper and brass pipe for water and steam service may be used for design pressures up to 250 pounds per square inch and for design temperatures to 406 °F.

(2) Copper and brass pipe for air may be used in accordance with the allowable stresses found from Table 56.60–1(a).

(2–a) Copper-nickel alloys may be used for water and steam service within the design stress and temperature limitations indicated in ANSI-B31.1.

(3) Copper tubing may be used for dead-end instrument service up to 1,000 pounds per square inch.

(4) Copper, brass, or aluminum pipe or tube shall not be used for flammable fluids except where specifically permitted by this part.

(5) Aluminum alloy pipe or tube may be used within the limitation stated in 123.2.7 of ANSI-B31.1 and paragraph (4) of this section (c)5.

(d) Nonmetallic pipe. Plastic pipe may be used subject to the conditions described in §56.60–25.

[CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69–127, 35 FR 9978, June 17, 1970; CGFR 72–59R, 37 FR 6189, Mar. 25, 1972; CGD 77–140, 54 FR 40602, Oct. 2, 1989; CGD 95–028, 62 FR 51200, Sept. 30, 1997; USCG–2000–7790, 65 FR 58460, Sept. 29, 2000]

Subpart 56.15—Fittings
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Source: CGD 77–140, 54 FR 40602, Oct. 2, 1989, unless otherwise noted.

§ 56.15-1 Pipe joining fittings.
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(a) Pipe joining fittings certified in accordance with subpart 50.25 of this subchapter are acceptable for use in piping systems.

(b) Threaded, flanged, socket-welding, buttwelding, and socket-brazing pipe joining fittings, made in accordance with the applicable standards in Tables 56.60–1(a) and 56.60–1(b) of this part and of materials complying with subpart 56.60 of this part, may be used in piping systems within the material, size, pressure, and temperature limitations of those standards and within any further limitations specified in this subchapter. Fittings must be designed for the maximum pressure to which they may be subjected, but in no case less than 50 pounds per square inch gage.

(c) Pipe joining fittings not accepted for use in piping systems in accordance with paragraph (b) of this section must meet the following:

(1) All pressure-containing materials must be accepted in accordance with §56.60–1 of this part.

(2) Fittings must be designed so that the maximum allowable working pressure does not exceed one-fourth of the burst pressure or produce a primary stress greater than one-fourth of the ultimate tensile strength of the material for Class II systems and for all Class I, I-L, and II-L systems receiving ship motion dynamic analysis and nondestructive examination. For Class I, I-L, or II-L systems not receiving ship motion dynamic analysis and nondestructive examination under §56.07–10(c) of this part, the maximum allowable working pressure must not exceed one-fifth of the burst pressure or produce a primary stress greater than one-fifth of the ultimate tensile strength of the material. The maximum allowable working pressure may be determined by—

(i) Calculations comparable to those of ANSI B31.1 or Section VIII of the ASME Code;

(ii) Subjecting a representative model to a proof test or experimental stress analysis described in paragraph A–22 of Section I of the ASME Code; or

(iii) Other means specifically accepted by the Marine Safety Center.

(3) Fittings must be tested in accordance with §56.97–5 of this part.

(4) If welded, fittings must be welded in accordance with subpart 56.70 of this part and part 57 of this chapter or by other processes specifically approved by the Marine Safety Center. In addition, for fittings to be accepted for use in piping systems in accordance with this paragraph, the following requirements must be met:

(i) For fittings sized three inches and below—

(A) The longitudinal joints must be fabricated by either gas or arc welding;

(B) One fitting of each size from each lot of 100 or fraction thereof must be flattened cold until the opposite walls meet without the weld developing any cracks;

(C) One fitting of each size from each lot of 100 or fraction thereof must be hydrostatically tested to the pressure required for a seamless drawn pipe of the same size and thickness produced from equivalent strength material, as determined by the applicable pipe material specification; and

(D) If a fitting fails to meet the test in paragraph (c)(4)(i)(B) or (c)(4)(i)(C) of this section, no fitting in the lot from which the test fitting was chosen is acceptable.

(ii) For fittings sized above three inches—

(A) The longitudinal joints must be fabricated by arc welding;

(B) For pressures exceeding 150 pounds per square inch, each fitting must be radiographically examined as specified in Section VIII of the ASME Code;

(C) For pressures not exceeding 150 pounds per square inch, the first fitting from each size in each lot of 20 or fraction thereof must be examined by radiography to ensure that the welds are of acceptable quality;

(D) One fitting of each size from each lot of 100 or fraction thereof must be hydrostatically tested to the pressure required for a seamless drawn pipe of the same size and thickness produced from equivalent strength material, as determined by the applicable pipe material specification; and

(E) If a fitting fails to meet the test in paragraph (c)(4)(ii)(C) or (c)(4)(ii)(D) of this section, no fitting in the lot from which the test fitting was chosen is acceptable.

(d) Single welded butt joints without the use of backing strips may be employed in the fabrication of pipe joining fittings of welded construction provided radiographic examination indicates that complete penetration is obtained.

(e) Each pipe joining fitting must be marked in accordance with MSS Standard SP–25.

§ 56.15-5 Fluid-conditioner fittings.
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(a) Fluid conditioner fittings certified in accordance with subpart 50.25 of this subchapter are acceptable for use in piping systems.

(b) Fluid conditioner fittings, not containing hazardous materials as defined in §150.115 of this chapter, which are made in accordance with the applicable standards listed in Table 56.60–1(b) of this part and of materials complying with subpart 56.60 of this part, may be used within the material, size, pressure, and temperature limitations of those standards and within any further limitations specified in this subchapter.

(c) The following requirements apply to nonstandard fluid conditioner fittings which do not contain hazardous materials as defined in §150.115 of this chapter:

(1) The following nonstandard fluid conditioner fittings must meet the applicable requirements in §54.01–5 (c)(3), (c)(4), and (d) of this chapter or the remaining provisions in part 54 of this chapter, except that Coast Guard shop inspection is not required:

(i) Nonstandard fluid conditioner fittings that have a net internal volume greater than 0.04 cubic meters (1.5 cubic feet) and that are rated for temperatures and pressures exceeding those specified as minimums for Class I piping systems.

(ii) Nonstandard fluid-conditioner fittings that have an internal diameter exceeding 15 centimeters (6 inches) and that are rated for temperatures and pressures exceeding those specified as minimums for Class I piping systems.

(2) All other nonstandard fluid conditioner fittings must meet the following:

(i) All pressure-containing materials must be accepted in accordance with §56.60–1 of this part.

(ii) Nonstandard fluid conditioner fittings must be designed so that the maximum allowable working pressure does not exceed one-fourth of the burst pressure or produce a primary stress greater than one-fourth of the ultimate tensile strength of the material for Class II systems and for all Class I, I-L, and II-L systems receiving ship motion dynamic analysis and nondestructive examination. For Class I, I-L, or II-L systems not receiving ship motion dynamic analysis and nondestructive examination under §56.07–10(c) of this part, the maximum allowable working pressure must not exceed one-fifth of the burst pressure or produce a primary stress greater than one-fifth of the ultimate tensile strength of the material. The maximum allowable working pressure may be determined by— (continued)