Section 172.102

49 CFR Ch. I (10-1-18 Edition)

(500 psig) or greater and conform to Class
105J. Each tank car must have a reclosing
pressure relief device having a start-to-discharge 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 devices in contact with lading must be of a
material which will not cause formation of
acetylides.
B45 Each tank must have a reclosing combination pressure relief device equipped
with stainless steel or platinum rupture
discs approved by the AAR Tank Car Committee.
B46 The detachable protective housing for
the loading and unloading valves of multiunit tank car tanks must withstand tank
test pressure and must be approved by the
Associate Administrator.
B47 Each tank may have a reclosing pressure relief device having a start-to-discharge 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 inspection 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
Section 173.24b of this subchapter, non-reclosing
pressure relief devices are authorized on
DOT 57 portable tanks.
B53 Packagings must be made of either aluminum 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 arrestors) approved by the Associate Administrator are also authorized.
B56 Water-tight,
sift-proof,
closed-top,
metal-covered hopper cars are also authorized if the particle size of the hazardous
material is not less than 149 microns.
B57 Class 115A tank car tanks used to transport chloroprene must be equipped with a
non-reclosing pressure relief device of a diameter 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 authorized 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, handling, inspection, and testing practices

must be approved by the Associate Administrator 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-discharge 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 becoming liquid full at 55 SectionC (130 SectionF). Specification 110A500W tanks must be stainless
steel.
B67 All valves and fittings must be protected 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 percent at 98 SectionC (208 SectionF). 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 cyanide may be shipped in the following siftproof and weather-resistant packagings:
metal covered hopper cars, covered motor
vehicles, portable tanks, or non-specification 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 device having a start-to-discharge 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).
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 construction 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 bottom of the tank. If a tank car tank is

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