cohmed trainingslide no. 1january 24, 2010 cryogenic cargo tank training cargo tanks - refrigerated...

COHMED Training Slide No. 1 January 24, 2010

Cryogenic Cargo Tank Training

Cargo Tanks -

Refrigerated Liquid Transport


Definition of Cryogenic Liquid

A cryogenic liquid means a refrigerated liquefied gas having a boiling point colder than -90ºC (-130ºF) at 101.3 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 §173.115(g)]


Cryogenic Liquids and TheirBoiling Points

-244º F-258º F

-273º F

KryptonMethane

Ethylene

OxygenArgon

Neon

Nitrogen

HydrogenHelium

-297º F

-410º F

-423º F-452º F

-302º F

-320º F

NOTE: Atmospheric gases turn solid at boiling points for neon, hydrogen and helium


Potential Hazards ofCryogenic 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


Cutaway View - Typical Cryogenic Trailer

Presented with Permission of Cryenco


Cryogenic Container-Similar to a Thermos Bottle

Cold or WarmLiquid

Va

cuu

m S

pac

e

Va

cuu

m S

pac

e

Glass Insert

Heat Is Kept In(Contents Kept Warm)

Heat Is Kept Out(Contents Kept Cold)

Protective Cap


Spec v. Non-spec Cargo TanksWhy Does it Matter ?

§173.320 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.


Non-spec Cargo TanksRequirements [§173.320(a)]

(1) Sections 171.15 and 171.16 of this subchaptera. Immediate notice of certain hazardous materials incidentsb. 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, 177.800, 177.804, and 177.823 of this subchapter



(1) Sections 171.15 and 171.16 of this subchaptera. Immediate notice of certain hazardous materials incidents

i. Fatalityii. Injury requiring admittance to hospitaliii. Evacuation of public lasting longer than one houriv. Major transportation artery is closed for longer than

one hourv. Flight pattern is alteredvi. Fire, breakage, spillage of radioactive materialvii. Fire, breakage, spillage of infectious substance/wasteviii. Spill of marine pollutant >450 litersix. Situation of continuing danger (person in possession of

haz mat determines)b. Detailed (written) hazardous materials incident reports



(2) Subparts A, B, C, D, G and H of part 172 a. Subpart A - Generalb. Subpart B - Haz Mat Table & Special provisionsc. Subpart C - Shipping papers d. Subpart D - Markinge. 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.



(3) Subparts A and B of part 173, and §§ 174.1, 177.800, 177.804, and 177.823 of this subchapter.

a. General (Parts 173.1 – 173.13)b. Preparation of Haz Mat for transportation (Parts 173.21

– 173.40)


Cargo Tank Authorization for cryogenic liquids

CGA -341 TC-341 MC-338/TC338

Atmospheric gases & helium <25.3 psig ONLY (subject to §173.320)

Atmospheric gases & helium <25.3 psig ONLY

Atmospheric gases & helium up to 500 psig

Flammable cryogenic gases (LH2 , LNG, Ethylene, etc.)


Construction Requirements Cryogenic Trailers

CGA-341 TC-341 MC-338/TC-338

Codes for tank construction

ASME Code CSA B620 ASME Code

Working Pressure

Less than 25.3 psig

Less than 25.3 psig

Between 25.3 psig and 500 psig

Manholes Required for LOX

Required for LOX

Required for LOX

Collision protection

Valves and piping between frame



Jacket Metal; LOX trlr – steel only

Metal; LOX trlr – steel only

Metal; LOX trlr – steel only

Inner Tank mat’ls

Aluminum or steel

Aluminum or steel

Aluminum or steel

Pressure relief device systems

Both inner tank and outer jacket




Requirements for Pressure Relief Systems

Tanks in LO2 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 LO2 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


Marking & Placarding Requirements for Cryogenic Trailers

CGA-341 TC-341 MC-338/TC-338PSNor appropriate common name (e.g., refrigerant gas)

PSN or appropriate common name (e.g., refrigerant gas)

PSN or appropriate common name (e.g., refrigerant gas)

ID number of product ID number of product 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




Non-spec vs. MC-338 Cryogenic TrailersRequirements 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-341 DOT-338


Placarding Requirements forCryogenic Cargo Tanks

CGA-341 MC-338

Placarding,flammable cryogens

CGA-341 cargo tanks notallowed for flammablecryogens unless underexemption

Flammagle gas (2.1)placard

Placarding, *nonflammablecryogens

* In Canada,placards are alwaysrequired

Required for oxygen,refrigerated liquid ONLY inUSA. Otherwise, notrequired in USA becausepressure is 25.3 psig or below(see 49CFR 173.20)

Nonflammable gas (2.2)placard

Placarding,poison cryogens

CGA-341 cargo tanks notallowed for poison cryogensunless under exemption

Poison gas (2.3) placard


Requalification Requirements forCryogenic Cargo Tanks

CGA-341 MC-338

External visual inspection Not required 1 year interval

Internal visual inspection Not required Not required

Lining inspection Not applicable (tank not lined)

Not applicable (tank not lined)

Leakage test Not required Not required

Pressure retest Not required 5 year interval

Thickness test Not required (non-corrosive materials being transported)

Not required (non-corrosive materials being transported


Inspection ChecklistCryogenic Trailers

Inspection item CGA-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

psig3. 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 §173.320

TC-341 -

“V” marking within 1 yr of inspection date


Inspection ChecklistCryogenic Trailers

Inspection item CGA-341/TC-341 Indication of compliance

MC-338/TC-338 Indication of compliance

Internal visual inspection within one year ?

CGA-341 – N/A per §173.320

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 test CGA-341 – N/A per §173.320

TC-341 -

“P” marking within 5 yrs of inspection date


Contact information

[email protected]

Tel. (203) 837-2294


Any Questions?

cohmed trainingslide no. 1january 24, 2010 cryogenic cargo tank training cargo tanks - refrigerated...

Documents

cryogenic fluids

cryogenic exception

term cryogenic

flammable cryogenic

liquid helium

atmospheric gases helium

specification cargo

liquid neon