Taylor-Wharton Bulk Tank Safety Data - Manual (Page 13)

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The tank was pressurized at the factory with nitrogen gas. If the tank
is to be filled with any other product, the nitrogen gas must be purged
from the tank. Purge with product gas until analysis indicates acceptable
purity.
Caution
To avoid injury, do not touch fill hose or connections with bare hands.
During filling, these parts are cooled extremely low temperatures. See
Safety Precautions for recommended protection.
Nitrogen Purge
Before placing tank in service, determine container contents impurity level
with one of the following instruments:
§ Meeco Moisture Analyzer
§ Alnor Dewpoint Analyzer
§ Model 210-S Gow-Mac Gas Master Hydrogen Analyzer
§ A Bulb tester for measuring Oxygen in Nitrogen or equivalent
If container contents purity is unacceptable, perform a nitrogen purge to
reduce contaminants.
Nitrogen Precool
A large quantity of product is lost due to flash-off when a warm container
is filled with liquefied gases. To minimize loses, precool the tank container
with nitrogen before filling with highly combustible or more expensive
liquefied gases. The residual nitrogen gas should be removed from the
container and piping by a pressure purge. The tank may then be filled with
service product.
Caution
Do not exceed liquid weight quantity specified for the tank. Container
supports could be damaged by the increased weight of the liquid.