RELIEF VALVE CALCULATIONS INCLUDE
The user should be familiar with
the ASME section 8 and relevant API publications:
The Liquid Relief - known flow calculation has options to size
for single or multiple valves or non certified valves.
The Gas Relief - known flow calculation has options for section
1, section 8 or the fire code. The reaction force and the noise
level are calculated.
The Steam Relief - known flow calculation has options for Section
1, section 8 and the fire code and calculates the reaction force
and noise level.
The Two phase - known flow calculation has options for Section
1, section 8 and the fire code and calculates the reaction force
and noise level. It has 7 different two phase calculations.
The Heat Exchanger - entrapped liquid calculation is for a blocked
in liquid filled exchanger which has the heat turned on. It calculates
the flow caused by the liquid expansion.
The Heat Exchanger - Tube failure calculation is for tube rupture
where the tube pressure is 50% greater than the shell pressure.
It assumes no vaporization of the shell side product.
The Pipeline - Entrapped liquid calculation is for liquid expansion
in long, blocked in, pipelines on a hot day. It usually only
takes a very small relief valve to avoid blowing the gaskets.
The Fire size - Liquid vaporization is the most complex calculation.
It gathers the flame wetted area of up to 15 liquid containing
vessels. The heat input is calculated either by The API 520 or
the National Fire Protection Association NFPA #30, method and
a relieving flow rate is determined. The reaction force and relieving
noise level are also calculated.
The Fire size - Gas expansion also gathers the flame wetted area,
this time of up to 15 gas containing vessels. The maximum flow
is then back calculated from the valve size. The reaction force
and relieving noise level are then calculated.
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