373 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 172.102 

Series 8 (see UN Manual of Tests and Cri-
teria, Part 1, Sub-section 18.7) (IBR, see 
§ 171.7 of this subchapter) or an alternative 
means approved by the Associate Adminis-
trator. 

TP33

The portable tank instruction as-

signed for this substance applies for granular 
and powdered solids and for solids which are 
filled and discharged at temperatures above 
their melting point which are cooled and 
transported as a solid mass. Solid substances 
transported or offered for transport above 
their melting point are authorized for trans-
portation in portable tanks conforming to 
the provisions of portable tank instruction 
T4 for solid substances of packing group III 
or T7 for solid substances of packing group 
II, unless a tank with more stringent re-
quirements for minimum shell thickness, 
maximum allowable working pressure, pres-
sure-relief devices or bottom outlets are as-
signed in which case the more stringent tank 
instruction and special provisions shall 
apply. Filling limits must be in accordance 
with portable tank special provision TP3. 
Solids meeting the definition of an elevated 
temperature material must be transported in 
accordance with the applicable requirements 
of this subchapter. 

TP36

For material assigned this portable 

tank special provision, portable tanks used 
to transport such material may be equipped 
with fusible elements in the vapor space of 
the portable tank. 

TP37

IM portable tanks are only author-

ized for the shipment of hydrogen peroxide 
solutions in water containing 72% or less hy-
drogen peroxide by weight. Pressure relief 
devices shall be designed to prevent the 
entry of foreign matter, the leakage of liquid 
and the development of any dangerous excess 
pressure. In addition, the portable tank must 
be designed so that internal surfaces may be 
effectively cleaned and passivated. Each 
tank must be equipped with pressure relief 
devices conforming to the following require-
ments: 

Concentration of hydrogen per peroxide solution 

Total

1

 

52% or less ..............................................................

11 

Over 52%, but not greater than 60% ......................

22 

Over 60%, but not greater than 72% ......................

32 

1

Total venting capacity in standard cubic feet hour 

(S.C.F.H.) per pound of hydrogen peroxide solution. 

TP38

Each portable tank must be insu-

lated with an insulating material so that the 
overall thermal conductance at 15.5 

°

C (60 

°

F) 

is no more than 1.5333 kilojoules per hour per 
square meter per degree Celsius (0.075 Btu 
per hour per square foot per degree Fahr-
enheit) temperature differential. Insulating 
materials may not promote corrosion to 
steel when wet. 

TP39

The portable tank instruction T4 

prescribed may continue to be applied until 
December 31, 2018. 

TP40

The portable tank must not be 

transported when connected with spray ap-
plication equipment. 

TP41

The portable tank instruction T9 

may continue to be applied until December 
31, 2018. 

TP44

Each portable tank must be made of 

stainless steel, except that steel other than 
stainless steel may be used in accordance 
with the provisions of § 173.24b(b) of this sub-
chapter. Thickness of stainless steel for tank 
shell and heads must be the greater of 7.62 
mm (0.300 inch) or the thickness required for 
a portable tank with a design pressure at 
least equal to 1.5 times the vapor pressure of 
the hazardous material at 46 

°

C (115 

°

F). 

TP45

Each portable tank must be made of 

stainless steel, except that steel other than 
stainless steel may be used in accordance 
with the provisions of 173.24b(b) of this sub-
chapter. Thickness of stainless steel for port-
able tank shells and heads must be the great-
er of 6.35 mm (0.250 inch) or the thickness re-
quired for a portable tank with a design pres-
sure at least equal to 1.3 times the vapor 
pressure of the hazardous material at 46 

°

C 

(115 

°

F). 

TP46

Portable tanks in sodium metal 

service are not required to be 
hydrostatically retested. 

TP47

The 2.5 year internal examination 

may be waived or substituted by other test 
methods or inspection procedures specified 
by the competent authority or its authorized 
body, provided that the portable tank is 
dedicated to the transport of the 
organometallic substances to which this 
tank special provision is assigned. However 
this examination is required when the condi-
tions of § 180.605(f) are met. 

(9) 

‘‘W’’ codes. 

These provisions apply 

only to transportation by water: 

Code/Special Provisions 

W1 This substance in a non friable prill or 

granule form is not subject to the require-
ments of this subchapter when tested in 
accordance with the UN Manual of Test 
and Criteria (IBR, 

see 

§ 171.7 of this sub-

chapter) and is found to not meet the defi-
nition or criteria for inclusion in Division 
5.1. 

W7

Vessel stowage category for uranyl ni-

trate hexahydrate solution is ‘‘D’’ as de-
fined in § 172.101(k)(4). 

W8

Vessel stowage category for pyrophoric 

thorium metal or pyrophoric uranium 
metal is ‘‘D’’ as defined in § 172.101(k)(4). 

W9

When offered for transportation by 

water, the following Specification pack-
agings are not authorized unless approved 
by the Associate Administrator: woven 
plastic bags, plastic film bags, textile bags, 
paper bags, IBCs and bulk packagings. 

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