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(continued) hemical protective clothing constructed of materials resistant to permeation by the cargo being handled is worn by all personnel engaged in an operation listed in paragraph (b) of this section:
(1) Splash protective eyewear.
(2) Long-sleeved gloves.
(3) Boots or shoe covers.
(4) Coveralls or lab aprons.
Note: “Guidelines for the Selection of Chemical Protective Clothing”, Third Edition, 1987, available from the American Conference of Governmental Industrial Hygienists, 1330 Kemper Meadow Drive, Cincinnati, OH 45240–1634, provides information on the proper clothing for the cargo being handled.
(b) The section applies during the following operations:
(1) Sampling cargo.
(2) Transferring cargo.
(3) Making or breaking cargo hose connections.
(4) Gauging a cargo tank, unless gauging is by closed system.
(5) Opening cargo tanks.
(c) Coveralls or lab aprons may be replaced by splash suits or aprons constructed of light weight or disposable materials if, in the judgment of the person in charge of cargo handling operations,
(1) Contact with the cargo is likely to occur only infrequently and accidentally; and
(2) The splash suit or apron is disposed of immediately after contamination.
(d) Splash protective eyewear must be tight-fitting chemical-splash goggles, face shields, or similar items intended specifically for eye protection from chemical splashing or spraying.
(e) The person in charge of cargo handling operations shall ensure that each person in the vicinity of an operation listed in the paragraph (b) of this section or in the vicinity of tanks, piping, or pumps being used to transfer the cargo wears splash protective eyewear under paragraph (d) of this section.
[CGD 88–100, 54 FR 40040, Sept. 29, 1989, as amended by USCG–1999–6216, 64 FR 53227, Oct. 1, 1999]
§ 151.50-74 Ethylidene norbornene.
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When Table 151.05 refers to this section, the following apply:
(a) 151.50–5 (g) and (h)
(b) Rubber hoses or fittings may not be used in transfer operations.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981]
§ 151.50-75 Ferric chloride solution.
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A containment system (cargo tank piping system, venting system, and gauging system) carrying this solution must be lined with rubber, corrosion resistant plastic, or a material approved by the Commandant (G-MSO).
[CGD 80–001, 46 FR 63279, Dec. 31, 1981, as amended by CGD 82–063b, 48 FR 4781, Feb. 3, 1983; CGD 88–100, 54 FR 40041, Sept. 29, 1989; 55 FR 17276, Apr. 24, 1990]
§ 151.50-76 Hydrochloric acid, spent (NTE 15%).
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(a)(1) Gravity type cargo tanks must be designed and tested to meet the rules of the American Bureau of Shipping for a head of water at least 8 feet above the tank top or the highest level the lading may rise, whichever is greater. The plate thickness of any part of the tank may not be less than three-eighths inch. A shell plating of a barge may not be on the boundary of any part of the cargo tank.
(2) Gravity tank vents must:
(i) Terminate above the weatherdeck, clear of all obstructions and away from any from any source of ignition; and
(ii) Be fitted with a single flame screen or two fitted flame screens as described in §151.03–25. Neither a shut-off valve nor a frangible disk may be fitted in the vent lines.
(b) Openings in the tanks are prohibited below deck, except for access openings used for inspection and maintenance of tanks, or unless otherwise specifically approved by the Commandant (G-MSO). Openings must be fitted with bolted cover plates and acid-resistant gaskets.
(c) Where special arrangements are approved by the Commandant (G-MSO) to permit a pump suction to be led from the bottom of the tank, the filling and discharge lines must be fitted with shutoff valves located above the weatherdeck or operable from it.
(d) The outage may not be less than 1 percent.
(e) An enclosed compartment containing, or a compartment adjacent to, a cargo tank:
(1) May have no electrical equipment that does not meet or exceed class I-B electrical requirements; and
(2) Must have at least one gooseneck vent of 2.5 inch diameter or greater. The structural arrangement of the compartment must provide for the free passage of air and gases to the vent or vents.
(f) No lights may be used during the cargo transfer operations, except installed electric or portable battery lights. Smoking is prohibited and the person in charge of cargo transfer shall ensure that “No Smoking” signs are displayed during cargo transfer operations.
(g) Tanks approved for the transportation of acid cargoes subject to this section may not be used for the transportation of any other commodity, except upon authorization by the Commandant (G-MSO).
(h) Each cargo tank must be examined internally at least once in every 4 years. If the lining of the cargo tank has deteriorated in service or is not in place, the Marine Inspector may require the tank to be tested by such nondestructive means as he may consider necessary to determine its condition.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981, as amended by CGD 82–063b, 48 FR 4781, Feb. 3, 1983]
§ 151.50-77 Fluorosilicic acid (30% or less) (hydrofluorosilicic acid).
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(a) Hydrofluorosilicic acid must be carried in gravity or pressure type cargo tanks independent of the vessel's structure. The tanks must be lined with rubber or other equally suitable material approved by the Commandant (G-MSO). See §151.15–3(f)(2).
(b) Notwithstanding the provisions of §151.50–20(b)(3), no compressed air may be used to discharge hydrofluorosilicic acid from gravity type cargo tanks unless:
(1) The tanks are of cylindrical shape with dished heads, and
(2) The air pressure does not exceed:
(i) The design pressure of the tank, and
(ii) 10 pounds per square inch gauge. The tanks must be fitted with pressure relief devices.
(c) During cargo transfer, a water hose must be connected to a water supply and be ready for immediate use. Any leakage or spillage of acid must be immediately washed down. This requirement can be met by facilities provided from shore.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981, as amended by CGD 82–063b, 48 FR 4781, Feb. 3, 1983; CGD 92–100, 59 FR 17028, Apr. 11, 1994]
§ 151.50-79 Methyl acetylene-propadiene mixture.
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(a) The composition of the methyl acetylene-propadiene mixture at loading must be within one of the following sets of composition limits:
(1) Composition 1 is:
(i) Maximum methyl acetylene to propadiene molar ratio of 3 to 1;
(ii) Maximum combined concentration of methyl acetylene and propadiene of 65 mole percent;
(iii) Minimum combined concentration of propane, butane, and isobutane of 24 mole percent, of which at least one-third (on a molar basis) must be butanes and one-third propane; and
(iv) Maximum combined concentration of propylene and butadiene of 10 mole percent.
(2) Composition 2 is:
(i) Maximum methyl acetylene and propadiene combined concentration of 30 mole percent;
(ii) Maximum methyl acetylene concentration of 20 mole percent;
(iii) Maximum propadiene concentration of 20 mole percent;
(iv) Maximum propylene concentration of 45 mole percent;
(v) Maximum butadiene and butylenes combined concentration of 2 mole percent;
(vi) Minimum saturated C4 hydrocarbon concentration of 4 mole percent; and
(vii) Minimum propane concentration of 25 mole percent.
(b) A barge carrying a methyl acetylene-propadiene mixture must have a refrigeration system that does not compress the cargo vapor or have a refrigeration system with the following features:
(1) A vapor compressor that does not raise the temperature and pressure of the vapor above 60 °C (140 °F) and 1.72 MPa guage (250 psig) during its operations, and that does not allow vapor to stagnate in the compressor while it continues to run.
(2) At the discharge piping from each compressor stage or each cylinder in the same stage of a reciprocating compressor:
(i) Two temperature actuated shutdown switches set to operate at 60 °C (140 °F) or less;
(ii) A pressure actuated shutdown switch set to operate at 1.72 MPa gauge (250 psig) or less; and
(iii) A safety relief valve set to relieve at 1.77 MPa gauge (256 psig) or less anywhere except into the compressor suction line.
(c) The piping system, including the cargo refrigeration system, for tanks to be loaded with methyl acetylene-propadiene mixture must be completely separate from piping and refrigeration systems for other tanks. If the piping system for the tanks to be loaded with methyl acetylene-propadiene mixture is not independent, the required piping separation must be accomplished by the removal of spool pieces, valves or other pipe sections and the installation of blank flanges at these locations. The required separation applies to all liquid and vapor piping, liquid and vapor vent lines and any other possible connections, such as common inert gas supply lines.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981]
§ 151.50-80 Nitric acid (70% or less).
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(a) Tanks, cargo piping, valves, fittings, and flanges (where exposed to the acid) must be lined with nitric acid resistant rubber or fabricated from nitric acid resistant stainless steel. See §151.15–3(f)(2).
(b) During cargo transfer, a water hose must be connected to a water supply, ready for immediate use. Any leakage or spillage of acid must be immediately washed down. This requirement can be met by facilities provided from shore.
(c) Nitric acid contaminated by other chemicals, oils, solvents, etc. may not be transported in bulk without an authorization from the Commandant (G-MSO).
[CGD 80–001, 46 FR 63280, Dec. 31, 1981, as amended by CGD 82–063b, 48 FR 4781, Feb. 3, 1983; CGD 88–100, 54 FR 40041, Sept. 29, 1989]
§ 151.50-81 Special operating requirements for heat sensitive cargoes.
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When table 151.05 refers to this section, the following apply to the cargo:
(a) Must not be carried in a tank equipped with heating coils unless the heating supply to the coils is disconnected.
(b) Must not be carried in a tank adjacent to another tank containing an elevated temperature cargo.
(c) Must not be carried in a deck tank.
[CGD 80–001, 46 FR 63280, Dec. 31, 1981, as amended by CGD 88–100, 54 FR 40041, Sept. 29, 1989]
§ 151.50-84 Sulfur dioxide.
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(a) Sulfur dioxide that is transported under the provisions of this part may not contain more than 100 ppm of water.
(b) Cargo piping must be at least Schedule 40 pipe.
(c) Flanges must be 150 lb. A.N.S.I. Standard minimum with tongue and groove or raised face.
(d) A cargo tank must:
(1) Meet the requirements of a Class I welded pressure vessel;
(2) Be designed for a maximum allowable working pressure of at least 125 psig;
(3) Be hydrostatically tested every two years to at least 188 psig;
(4) Be provided with one or more manholes that are fitted with a cover sized not less than 15 inches by 23 inches or 13 inches nominal diameter, located above the maximum liquid level, and as close as possible to the top of the tank;
(5) Have no openings other than those required in paragraph (d)(4) of this section;
(6) Have no liquid level gauges other than closed or indirect gauges;
(7) Have all valves and the closed gauge that is required by Table 151.05 bolted to the cover or covers that are required in paragraph (d)(4) of this section;
(8) Have a metal housing that is fitted with a drain and vent connection protecting all valves and the closed gauge within this housing against mechanical damage;
(9) Have all safety relief valves discharging into the protective housing;
(10) Not be interconnected with another cargo tank by piping or manifold that carriers cargo liquid, except vapor lines connected to a common header, and
(11) Have an excess flow valve that is located on the inside of the tank for every liquid and vapor connection, except the safety relief valve;
(12) Have no bypass opening on any excess flow valve.
(e) Cargo transfer operations:
(1) May not be conducted with more than one cargo tank at a time unles each tank is filled from or discharged to shore tanks through separate lines;
(2) Must be conducted with connections between fixed barge piping and shore piping of either Schedule 40 pipe having flexible metallic joints that meet §151.04–5(h) or of flexible metallic hose that is acceptable to the Commandant (G-MSO);
(3) From barge to shore must be by pressurization with an oil free, non-reactive gas that has a maximum of 100 ppm moisture;
(4) Must be conducted with vapor return to shore connections that ensure that all vapor is returned to shore; and
(5) Must be conducted with every person on the barge carrying a respiratory protective device that protects the wearer against sulfur dioxide vapors and provides respiratory protection for emergency escape from a contaminated area that results from cargo leakage.
(f) Respiratory protective equipment must be of a size and weight that allows unrestricted movement and wearing of a lifesaving device.
(g) After the completion of cargo transfer, all liquid sulfur dioxide in the cargo piping must be removed and cargo transfer piping must be disconnected at the cargo tanks. After the cargo piping is disconnected, both ends of the line must be plugged or fitted with blind flanges.
[CGD 80–001, 46 FR 63280, Dec. 31, 1981, as amended by CGD 82–063b, 48 FR 4781, Feb. 3, 1983; CGD 88–100, 54 FR 40041, Sept. 29, 1989; 55 FR 17276, Apr. 24, 1990]
§ 151.50-86 Alkyl (C7–C9) nitrates.
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(a) The carriage temperature of octyl nitrates must be maintained below 100 °C (212 °F) in order to prevent the occurrence of a self-sustaining exothermic decomposition reaction.
(b) Octyl nitrates may not be carried in a deck tank unless the tank has a combination of insulation and a water deluge system sufficient to maintain the tank's cargo temperature below 100 °C (212 °F) and the cargo temperature rise at or below 1.5 °C(2.7 °F)/hour, for a fire of 650 °C (1200 °F).
[CGD 88–100, 54 FR 40040, Sept. 29, 1989; CGD 92–100, 59 FR 17028, Apr. 11, 1994]
Subpart 151.55—Special Requirements for Materials of Construction
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§ 151.55-1 General.
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(a) This section provides special requirements for the materials of construction of equipment that may come into contact with various cargoes. Table 151.05 contains specific requirements for various cargoes.
(b) Copper, copper alloys, zinc, and aluminum shall not be used as materials of construction for tanks, pipelines, valves, fittings, and other items of equipment that may come in contact with the cargo liquid or vapor. (Equivalent to §151.56–1(a),(b), and (c).)
(c) Copper, copper alloys, zinc, galvanized steel, and mercury shall not be used as materials of construction for tanks, pipelines, valves, fittings, and other items of equipment that may come in contact with the cargo liquid or vapor. (Equivalent to §151.56–1(b),(c), and (g).)
(d) Aluminum, magnesium, zinc, and lithium shall not be used as materials of construction for tanks, pipelines, valves, fittings, and other items of equipment that may come in contact with the cargo liquid or vapor. (Equivalent to §151.56–1(a),(c), and (d).)
(e) Copper and copper bearing alloys shall not be used as materials of construction for tanks, pipelines, valves, fittings, and other items of equipment that may come in contact with the cargo liquid or vapor. (Equivalent to §151.56–1(b).)
(f) Aluminum or copper or alloys of either shall not be used as materials of construction for tanks, pipelines, valves, fittings, and other items of equipment that may come in contact with the cargo vapor or liquid. (Equivalent to §151.56–1(a) and (b).)
(g) Aluminum, stainless steel, or steel covered with a suitable protective lining or coating shall be used as materials of construction for tanks, pipelines, valves fittings, and other items of equipment that may come in contact with the cargo liquid or vapor. (Equivalent to §151.58–1(a).)
(h) Alkaline or acidic materials, such as caustic soda or sulfuric acid, should not be allowed to contaminate this cargo.
(i) For concentrations of 98 percent or greater, aluminum or stainless steel shall be used as materials of construction. For concentrations of less than 98 percent, 304L or 316 stainless steel shall be used as materials of construction.
(j) Zinc, alloys that have more than 10 percent zinc by weight, and aluminum may not be used as materials of construction for tanks, pipelines, valves, fittings, and other items of equipment that may come in contact with cargo liquid or vapor. (Equivalent to §151.56–1(a) and (c).)
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as amended by CGD 73–275R, 41 FR 3087, Jan. 21, 1976; CGD 75–223, 42 FR 8378, Feb. 10, 1977; CGD 88–100, 54 FR 40041, Sept. 29, 1989]
Subpart 151.56—Prohibited Materials of Construction
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§ 151.56-1 Prohibited materials.
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When one of the following paragraphs of this section is referenced in table 151.05, the materials listed in that paragraph may not be used in components that contact the cargo or its vapor:
(a) Aluminum or aluminum alloys.
(b) Copper or copper alloys.
(c) Zinc, galvanized steel, or alloys having more than 10 percent zinc by weight.
(d) Magnesium.
(e) Lead.
(f) Silver or silver alloys.
(g) Mercury.
[CGD 88–100, 54 FR 40041, Sept. 29, 1989]
Subpart 151.58—Required Materials of Construction
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§ 151.58-1 Required materials.
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When one of the following paragraphs of this section is referenced in table 151.05, only those materials listed in that paragraph may be used in components that contact the cargo or its vapor:
(a) Aluminum, stainless steel, or steel covered with a protective lining or coating. (See §151.15–3(f)(2).)
(b)–(c) [Reserved]
(d) Solid austenitic stainless steel.
(e) Stainless steel or steel covered with a suitable protective lining or coating. (See §151.15–3(f)(2).)
[CGD 88–100, 54 FR 40041, Sept. 29, 1989]