364 

49 CFR Ch. I (10–1–18 Edition) 

§ 172.102 

(500 psig) or greater and conform to Class 
105J. Each tank car must have a reclosing 
pressure relief device having a start-to-dis-
charge pressure of 10.34 Bar (150 psig). The 
tank car specification may be marked to 
indicate a test pressure of 13.79 Bar (200 
psig). 

B44

All parts of valves and safety relief de-

vices in contact with lading must be of a 
material which will not cause formation of 
acetylides. 

B45

Each tank must have a reclosing com-

bination pressure relief device equipped 
with stainless steel or platinum rupture 
discs approved by the AAR Tank Car Com-
mittee. 

B46

The detachable protective housing for 

the loading and unloading valves of multi- 
unit tank car tanks must withstand tank 
test pressure and must be approved by the 
Associate Administrator. 

B47

Each tank may have a reclosing pres-

sure relief device having a start-to-dis-
charge pressure setting of 310 kPa (45 psig). 

B48

Portable tanks in sodium metal service 

may be visually inspected at least once 
every 5 years instead of being retested 
hydrostatically. Date of the visual inspec-
tion must be stenciled on the tank near 
the other required markings. 

B49

Tanks equipped with interior heater 

coils are not authorized. Single unit tank 
car tanks must have a reclosing pressure 
relief device having a start-to-discharge 
pressure set at no more than 1551 kPa (225 
psig). 

B52

Notwithstanding the provisions of 

§ 173.24b of this subchapter, non-reclosing 
pressure relief devices are authorized on 
DOT 57 portable tanks. 

B53

Packagings must be made of either alu-

minum or steel. 

B54

Open-top, sift-proof rail cars are also 

authorized. 

B55

Water-tight, sift-proof, closed-top, 

metal-covered hopper cars, equipped with a 
venting arrangement (including flame ar-
restors) approved by the Associate Admin-
istrator are also authorized. 

B56

Water-tight, sift-proof, closed-top, 

metal-covered hopper cars are also author-
ized if the particle size of the hazardous 
material is not less than 149 microns. 

B57

Class 115A tank car tanks used to trans-

port chloroprene must be equipped with a 
non-reclosing pressure relief device of a di-
ameter not less than 305 mm (12 inches) 
with a maximum rupture disc pressure of 
310 kPa (45 psig). 

B59

Water-tight, sift-proof, closed-top, 

metal-covered hopper cars are also author-
ized provided that the lading is covered 
with a nitrogen blanket. 

B61

Written procedures covering details of 

tank car appurtenances, dome fittings, 
safety devices, and marking, loading, han-
dling, inspection, and testing practices 

must be approved by the Associate Admin-
istrator before any single unit tank car 
tank is offered for transportation. 

B65

Tank cars constructed before March 16, 

2009, must have a test pressure of 34.47 Bar 
(500 psig) or greater and conform to Class 
105A. Each tank car must have a reclosing 
pressure relief device having a start-to-dis-
charge pressure of 15.51 Bar (225 psig). The 
tank car specification may be marked to 
indicate a test pressure of 20.68 Bar (300 
psig). 

B66

Each tank must be equipped with gas 

tight valve protection caps. Outage must 
be sufficient to prevent tanks from becom-
ing liquid full at 55 

°

C (130 

°

F). Specifica-

tion 110A500W tanks must be stainless 
steel. 

B67

All valves and fittings must be pro-

tected by a securely attached cover made 
of metal not subject to deterioration by 
the lading, and all valve openings, except 
safety valve, must be fitted with screw 
plugs or caps to prevent leakage in the 
event of valve failure. 

B68

Sodium must be in a molten condition 

when loaded and allowed to solidify before 
shipment. Outage must be at least 5 per-
cent at 98 

°

C (208 

°

F). Bulk packagings 

must have exterior heating coils fusion 
welded to the tank shell which have been 
properly stress relieved. The only tank car 
tanks authorized are Class DOT 105 tank 
cars having a test pressure of 2,069 kPa (300 
psig) or greater. 

B69

Dry sodium cyanide or potassium cya-

nide may be shipped in the following sift- 
proof and weather-resistant packagings: 
metal covered hopper cars, covered motor 
vehicles, portable tanks, or non-specifica-
tion bins. 

B70

If DOT 103ANW tank car tank is used: 

All cast metal in contact with the lading 
must have 96.7 percent nickel content; and 
the lading must be anhydrous and free 
from any impurities. 

B76

Tank cars constructed before March 16, 

2009, must have a test pressure of 20.68 Bar 
(300 psig) or greater and conform to Class 
105S, 112J, 114J or 120S. Each tank car 
must have a reclosing pressure relief de-
vice having a start-to-discharge pressure of 
10.34 Bar (150 psig). The tank car specifica-
tion may be marked to indicate a test pres-
sure of 13.79 Bar (200 psig). 

B77

Other packaging are authorized when 

approved by the Associate Administrator. 

B78

Tank cars must have a test pressure of 

4.14 Bar (60 psig) or greater and conform to 
Class 103, 104, 105, 109, 111, 112, 114 or 120. 
Heater pipes must be of welded construc-
tion designed for a test pressure of 500 psig. 
A 25 mm (1 inch) woven lining of asbestos 
or other approved material must be placed 
between the bolster slabbing and the bot-
tom of the tank. If a tank car tank is 

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