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Design Considerations - index
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Vaporizer Design Considerations


DOE-HDBK-1132-99
gas used depends on the chemical constituents of the vessel contents. Though air
purge is used in nonflammable mixtures, nitrogen purging of vessels is the most widely
used method in nonreactor facilities and is the primary subject of discussion in this
section.
Systems Design: General Purge Systems Design Considerations . Nitrogen
3.2.1
systems are normally delivered as packaged systems that include the liquid
nitrogen storage tank with appropriate pressure build-up and economizer circuits,
ambient vaporizers, interconnecting piping, and discharge pressure regulators to
maintain delivery at customer-required pressures. Procurement of a standard,
packaged system on a performance-based specification should be considered;
however, upgrading of individual components may be required in certain cases
where the failure of the inert gas supply to vessels causes undesired vapor
space mixtures to form.
Components Design Considerations: Storage Tanks . Liquid nitrogen storage
3.2.2
tanks normally are furnished to operate up to 250 psig saturation pressure. The
appropriate operating pressure selected should be based on the following
factors:
delivery pressure at the process vessels;
storage capacity required (i.e., the higher saturation pressure, the lower
the volume of free gas available per unit liquid volume);
length of service piping from vaporizer to use point (i.e., the longer the
piping, the higher the transport losses);
safety consideration of high-pressure storage (see ASME Boiler and
Pressure Vessel Code, Section VIII).
Pressure Buildup Coils Design Considerations . Pressure build-up coils in
3.2.3
tanks automatically maintain the station pressure through tank pressure
excursions. Materials used in the coils should be selected based on evaluation
of material strength and heat transfer capabilities.
II-38


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