Section 172.102

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

conditions of incipient opening, with the
portable tank in a level attitude. No outage
is required for helium.
TP6 The tank must be equipped with a
pressure release device which prevent a tank
from bursting under fire engulfment conditions (the conditions prescribed in CGA pamphlet S-1.2 (see Section 171.7 of this subchapter) or
alternative conditions approved by the Associate Administrator may be used to consider
the fire engulfment condition), taking into
account the properties of the hazardous material to be transported.
TP7 The vapor space must be purged of
air by nitrogen or other means.
TP8 A portable tank having a minimum
test pressure of 1.5 bar (150 kPa) may be used
when the flash point of the hazardous material transported is greater than 0 SectionC (32 SectionF).
TP9 A hazardous material assigned to
special provision TP9 in Column (7) of the
Section 172.101 Table may only be transported in a
portable tank if approved by the Associate
Administrator.
TP10 The portable tank must be fitted
with a lead lining at least 5 mm (0.2 inches)
thick. The lead lining must be tested annually to ensure that it is intact and functional. Another suitable lining material may
be used if approved by the Associate Administrator.
TP12 This material is considered highly
corrosive to steel.
TP13 Self-contained breathing apparatus
must be provided when this hazardous material is transported by sea.
TP16 The portable tank must be protected against over and under pressurization
which may be experienced during transportation. The means of protection must be approved by the approval agency designated to
approve the portable tank in accordance
with the procedures in part 107, subpart E, of
this subchapter. The pressure relief device
must be preceded by a frangible disk in accordance
with
the
requirements
in
Section 178.275(g)(3) of this subchapter to prevent
crystallization of the product in the pressure
relief device.
TP17 Only inorganic non-combustible materials may be used for thermal insulation of
the tank.
TP18 The temperature of this material
must be maintained between 18 SectionC (64.4 SectionF)
and 40 SectionC (104 SectionF) while in transportation.
Portable tanks containing solidified methacrylic acid must not be reheated during
transportation.
TP19 The calculated wall thickness must
be increased by 3 mm at the time of construction. Wall thickness must be verified
ultrasonically at intervals midway between
periodic hydraulic tests (every 2.5 years).
The portable tank must not be used if the
wall thickness is less than that prescribed by
the applicable T code in Column (7) of the
Table for this material.

TP20 This hazardous material must only
be transported in insulated tanks under a nitrogen blanket.
TP21 The wall thickness must not be less
than 8 mm. Portable tanks must be hydraulically tested and internally inspected at intervals not exceeding 2.5 years.
TP22 Lubricants for portable tank fittings (for example, gaskets, shut-off valves,
flanges) must be oxygen compatible.
TP24 The portable tank may be fitted
with a device to prevent the build up of excess pressure due to the slow decomposition
of the hazardous material being transported.
The device must be in the vapor space when
the tank is filled under maximum filling
conditions. This device must also prevent an
unacceptable amount of leakage of liquid in
the case of overturning.
TP25 Sulphur trioxide 99.95% pure and
above may be transported in tanks without
an inhibitor provided that it is maintained
at a temperature equal to or above 32.5 SectionC
(90.5 SectionF).
TP26 The heating device must be exterior
to the shell. For UN 3176, this requirement
only applies when the hazardous material reacts dangerously with water.
TP27 A portable tank having a minimum
test pressure of 4 bar (400 kPa) may be used
provided the calculated test pressure is 4 bar
or less based on the MAWP of the hazardous
material, as defined in Section 178.275 of this subchapter, where the test pressure is 1.5 times
the MAWP.
TP28 A portable tank having a minimum
test pressure of 2.65 bar (265 kPa) may be
used provided the calculated test pressure is
2.65 bar or less based on the MAWP of the
hazardous material, as defined in Section 178.275 of
this subchapter, where the test pressure is
1.5 times the MAWP.
TP29 A portable tank having a minimum
test pressure of 1.5 bar (150.0 kPa) may be
used provided the calculated test pressure is
1.5 bar or less based on the MAWP of the hazardous materials, as defined in Section 178.275 of
this subchapter, where the test pressure is
1.5 times the MAWP.
TP30 This hazardous material may only
be transported in insulated tanks.
TP31 This hazardous material may only
be transported in tanks in the solid state.
TP32 Portable tanks may be used subject
to the following conditions:
a. Each portable tank constructed of metal
must be fitted with a pressure-relief device
consisting of a reclosing spring loaded type,
a frangible disc or a fusible element. The set
to discharge for the spring loaded pressure
relief device and the burst pressure for the
frangible disc, as applicable, must not be
greater than 2.65 bar for portable tanks with
minimum test pressures greater than 4 bar;
b. The suitability for transport in tanks
must be demonstrated using test 8(d) in Test

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