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COHMED TrainingSlide No. 1January 24, 2010 Cryogenic Cargo Tank Training Cargo Tanks - Refrigerated Liquid Transport.

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Presentation on theme: "COHMED TrainingSlide No. 1January 24, 2010 Cryogenic Cargo Tank Training Cargo Tanks - Refrigerated Liquid Transport."— Presentation transcript:

1 COHMED TrainingSlide No. 1January 24, 2010 Cryogenic Cargo Tank Training Cargo Tanks - Refrigerated Liquid Transport

2 COHMED TrainingSlide No. 2January 24, 2010 Definition of Cryogenic Liquid  A cryogenic liquid means a refrigerated liquefied gas having a boiling point colder than -90ºC (-130ºF) at kPa (14.7 psia) A material meeting this definition is subject to the requirements of the HMR without regard to whether it meets the definition of a non-flammable, non-poisonous compressed gas [see 49 CFR § (g)]

3 COHMED TrainingSlide No. 3January 24, 2010 Cryogenic Liquids and Their Boiling Points -244 º F -258 º F -273 º F Krypton Methane Ethylene Oxygen Argon Neon Nitrogen Hydrogen Helium -297 º F -410 º F -423 º F -452 º F -302 º F -320 º F NOTE: Atmospheric gases turn solid at boiling points for neon, hydrogen and helium

4 COHMED TrainingSlide No. 4January 24, 2010 Potential Hazards of Cryogenic Liquids  Frostbite on skin caused by short term exposure to very low temperatures  Large volumes of gas generated by high expansion of liquid to gas (~800x expansion ratio)  Flammable gas/air mixtures resulting from leaks  Asphyxiating atmosphere resulting from leaks of non- flammable gases  Leaks caused by components shrinking at very low temperatures  “Oxygen rich” liquid air condensing on outside of transfer hoses or piping caused by very low temperatures  Damage to carbon steel and elastomeric components resulting from exposure to cryogenic temperatures  Unexpected functioning of safety valves or bursting discs on containers

5 COHMED TrainingSlide No. 5January 24, 2010 Cutaway View - Typical Cryogenic Trailer Presented with Permission of Cryenco

6 COHMED TrainingSlide No. 6January 24, 2010 Cryogenic Container- Similar to a Thermos Bottle

7 COHMED TrainingSlide No. 7January 24, 2010 Spec v. Non-spec Cargo Tanks Why Does it Matter ? § Cryogenic liquids; exceptions. (a) Atmospheric gases and helium, cryogenic liquids, in Dewar flasks, insulated cylinders, insulated portable tanks, insulated cargo tanks, and insulated tank cars, designed and constructed so that the pressure in such packagings will not exceed 25.3 psig under ambient temperature conditions during transportation are not subject to the requirements of this subchapter when transported by motor vehicle or railcar except as specified in paragraphs (a)(1), (a)(2), and (a)(3) of this section.

8 COHMED TrainingSlide No. 8January 24, 2010 Non-spec Cargo Tanks Requirements [§ (a)] (1)Sections and of this subchapter a.Immediate notice of certain hazardous materials incidents b.Detailed hazardous materials incident reports (2)Subparts A, B, C, D, G and H of part 172 (3)Subparts A and B of part 173, and §§ 174.1, , , and of this subchapter

9 COHMED TrainingSlide No. 9January 24, 2010 Non-spec Cargo Tanks Requirements [§ (a)] (1)Sections and of this subchapter a.Immediate notice of certain hazardous materials incidents i.Fatality ii.Injury requiring admittance to hospital iii.Evacuation of public lasting longer than one hour iv.Major transportation artery is closed for longer than one hour v.Flight pattern is altered vi.Fire, breakage, spillage of radioactive material vii.Fire, breakage, spillage of infectious substance/waste viii.Spill of marine pollutant >450 liters ix.Situation of continuing danger (person in possession of haz mat determines) b.Detailed (written) hazardous materials incident reports

10 COHMED TrainingSlide No. 10January 24, 2010 Non-spec Cargo Tanks Requirements [§ (a)] (2)Subparts A, B, C, D, G and H of part 172 a.Subpart A - General b.Subpart B - Haz Mat Table & Special provisions c.Subpart C - Shipping papers d.Subpart D - Marking e.Subpart G – Emergency Response Information f.Subpart H – Training NOTE: Releases do not include a release that is the result of venting through a pressure control valve, or the neck of the Dewar flask.

11 COHMED TrainingSlide No. 11January 24, 2010 Non-spec Cargo Tanks Requirements [§ (a)] (3) Subparts A and B of part 173, and §§ 174.1, , , and of this subchapter. a.General (Parts – ) b.Preparation of Haz Mat for transportation (Parts – )

12 COHMED TrainingSlide No. 12January 24, 2010 Cargo Tank Authorization for cryogenic liquids CGA -341TC-341MC-338/TC338 Atmospheric gases & helium <25.3 psig ONLY (subject to § ) Atmospheric gases & helium <25.3 psig ONLY Atmospheric gases & helium up to 500 psig Flammable cryogenic gases (LH 2, LNG, Ethylene, etc.)

13 COHMED TrainingSlide No. 13January 24, 2010 Construction Requirements Cryogenic Trailers

14 COHMED TrainingSlide No. 14January 24, 2010 Requirements for Pressure Relief Systems  Tanks in LO 2 or flammable cryogenic service must have two independent pressure relief systems  1 or more PRV’s  1 or more bursting discs or PRV’s  Tanks in LO 2 or flammable cryogenic service must have two independent pressure relief systems  1 or more PRV’s  1 or more bursting discs or PRV’s CGA-341 DOT-338

15 COHMED TrainingSlide No. 15January 24, 2010 Marking & Placarding Requirements for Cryogenic Trailers CGA-341TC-341MC-338/TC-338 PSNor appropriate common name (e.g., refrigerant gas) ID number of product “Emergency shutoff” if trailre has such valve OWTT (One Way Travel Time) for flammable gas “Insulation for OXYGEN”; “ Insulation Not for OXYGEN Appropriate placard(s) on both sides and each end of tank

16 COHMED TrainingSlide No. 16January 24, 2010 Non-spec vs. MC-338 Cryogenic Trailers Requirements for Pressure Relief Systems  Tanks in LHe or atmospheric gas service must have at least one pressure relief system  1 or more PRV’s  Combination of 1 or more bursting discs or PRV’s  Capacities of PR System must equal or exceed amount specified in CGA S-1.2  120% for primary device  150% for secondary device  Tanks in LHe or atmospheric gas service must have at least one pressure relief system  1 or more PRV’s  Combination of 1 or more bursting discs or PRV’s  Capacities of PR System must equal or exceed amount specified in CGA S-1.2  120% for primary device  150% for secondary device CGA-341DOT-338

17 COHMED TrainingSlide No. 17January 24, 2010 Placarding Requirements for Cryogenic Cargo Tanks

18 COHMED TrainingSlide No. 18January 24, 2010 Requalification Requirements for Cryogenic Cargo Tanks

19 COHMED TrainingSlide No. 19January 24, 2010 Inspection Checklist Cryogenic Trailers Inspection itemCGA-341/ TC-341 Indication of compliance MC-338/ TC-338 Indication of compliance Is trailer CGA/TC-341 or MC-338? 1. Dataplate 2. Pressure setting on “road relief valve” <25.3 psig 1. Dataplate 2. Pressure setting >25.3 psig 3.Emergency shutoff valve on flammable gas or oxygen cargo tanks 4.OWTT marking for flammable gas External visual inspection within one year ? CGA-341 – N/A per § TC “V” marking within 1 yr of inspection date

20 COHMED TrainingSlide No. 20January 24, 2010 Inspection Checklist Cryogenic Trailers Inspection itemCGA-341/ TC-341 Indication of compliance MC-338/ TC-338 Indication of compliance Internal visual inspection within one year ? CGA-341 – N/A per § TC-341 – CVRT after internal inspection and thereafter in lieu of internal visual inspection N/A for MC-338 – pressure test in lieu of internal visual inspection Pressure testCGA-341 – N/A per § TC “P” marking within 5 yrs of inspection date

21 COHMED TrainingSlide No. 21January 24, 2010 Contact information Tel. (203)

22 COHMED TrainingSlide No. 22January 24, 2010 Any Questions?


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