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11 The design pressure for pressure relief is the maximum design pressure permitted, considering all components in the piping system.
12 Set pressure is the pressure at which the device begins to relieve, e.g., lift pressure of a spring-actuated relief valve, bursting pressure of a rupture disk, or breaking pressure of a breaking pin device.
13 Maximum relieving pressure is the maximum system pressure
during a pressure relieving event.
402.2.3 Normal Operating Conditions. For normal
operation the maximum steady state operating pressure
shall not exceed the internal design pressure and pressure
ratings for the components used.
402.2.4 Ratings - Allowance for Variations From
Normal Operations. Surge pressures in a liquid pipeline
are produced by a change in the velocity of the moving
stream that results from shutting down of a pump
station or pumping unit, closing of a valve, or blockage
of the moving stream.
Surge pressure attenuates (decreases in intensity) as
it moves away from its point of origin.
Surge calculations shall be made, and adequate controls
and protective equipment shall be provided, so
that the level of pressure rise due to surges and other
variations from normal operations shall not exceed the
internal design pressure at any point in the piping
system and equipment by more than 10%.
402.2.3 Normal Operating Conditions. For normal
operation the maximum steady state operating pressure
shall not exceed the internal design pressure and pressure
ratings for the components used.
451.1 Operating Pressure
(u) Care shall be exercised to assure that at any
point in the piping system the maximum steady state
operating pressure and static head pressure with the
line in a static condition do not exceed at that point
the internal design pressure and pressure ratings for
the components used as specified in para. 402.2.3, and
that the level of pressure rise due to surges and other
variations from normal operation does not exceed the
internal design pressure at any point in the piping
system and equipment by more than 10% as specified
in para. 402.2.4.
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456
(c) In no case shall the maximum steady state operating
pressure of a piping system be raised to a value
higher than the internal design pressure permitted by
this Code for a new piping system constructed of the
same materials.