cohmed trainingslide no. 1january 24, 2010 cryogenic cargo tank training cargo tanks - refrigerated...
TRANSCRIPT
COHMED Training Slide No. 1 January 24, 2010
Cryogenic Cargo Tank Training
Cargo Tanks -
Refrigerated Liquid Transport
COHMED Training Slide No. 2 January 24, 2010
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)]
COHMED Training Slide No. 3 January 24, 2010
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
COHMED Training Slide No. 4 January 24, 2010
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
COHMED Training Slide No. 5 January 24, 2010
Cutaway View - Typical Cryogenic Trailer
Presented with Permission of Cryenco
COHMED Training Slide No. 6 January 24, 2010
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
COHMED Training Slide No. 7 January 24, 2010
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.
COHMED Training Slide No. 8 January 24, 2010
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
COHMED Training Slide No. 9 January 24, 2010
Non-spec Cargo TanksRequirements [§173.320(a)]
(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
COHMED Training Slide No. 10 January 24, 2010
Non-spec Cargo TanksRequirements [§173.320(a)]
(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.
COHMED Training Slide No. 11 January 24, 2010
Non-spec Cargo TanksRequirements [§173.320(a)]
(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)
COHMED Training Slide No. 12 January 24, 2010
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.)
COHMED Training Slide No. 13 January 24, 2010
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
Valves and piping between frame
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
Both inner tank and outer jacket
Both inner tank and outer jacket
COHMED Training Slide No. 14 January 24, 2010
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
COHMED Training Slide No. 15 January 24, 2010
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
“Insulation for OXYGEN”; “ Insulation Not for OXYGEN
“Insulation for OXYGEN”; “ Insulation Not for OXYGEN
Appropriate placard(s) on both sides and each end of tank
Appropriate placard(s) on both sides and each end of tank
Appropriate placard(s) on both sides and each end of tank
COHMED Training Slide No. 16 January 24, 2010
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
COHMED Training Slide No. 17 January 24, 2010
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
COHMED Training Slide No. 18 January 24, 2010
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
COHMED Training Slide No. 19 January 24, 2010
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
COHMED Training Slide No. 20 January 24, 2010
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
COHMED Training Slide No. 21 January 24, 2010
Contact information
Tel. (203) 837-2294
COHMED Training Slide No. 22 January 24, 2010
Any Questions?