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ANOMALY CAUSE EFFECT ACTIONS
The safety valve doesn’t open because of
an installation mistake.
Wrong installation of the valve on the system
(i.e. connection to the system of the outlet
side instead of the inlet side).
The pressure of the plant increases over
than the fixed security limits.
Stop the system, remove the valve and
install it properly. Refer the problem to the
plant Security Manager.
Leakage (1). Seat and/or disc surfaces damaged because
of foreign matters presence (i.e. welding
residuals).
Fluid loss Stop the system and contact Besa Technical
Assistance.
Leakage (2).
Leakage (2). The operating pressure of the system is 90%
higher than the set pressure of the safety
valve.
Fluid loss. Stop the system and contact Besa Technical
Assistance.
Leakage (3).
Due to excessive vibration of the system.
Pulsating flow of medium.
Induced vibrations for mechanic causes.
Fluid loss and possible damage of seat
and/or disc tightness surfaces.
Stop the system and contact Besa Technical
Assistance.
Insufficient discharge capacity respect what
declared or estimated (1).
Fluids are different than the previously
indicated and considered.
The pressure of the plant increases over
than the fixed security limits.
Stop the system and contact Besa Technical
Assistance.
Insufficient discharge capacity respect what
declared or estimated (2).
Wrong dimensioning of the safety valve
because of a calculation mistake or wrong
information received from the
Customer/User.
The pressure of the plant increases over
than the fixed security limits.
Stop the system and contact Besa Technical
Assistance.
The pressure of the plant increases over
than the fixed security limits.
Stop the plant, remove the gag test and refer
the problem to the plant Security Manager.
“Floating”, hammering-in of the disc on
the seat.
Excessive built-up back pressure during
safety valve discharge, or excessive load
loss at the inlet (higher than 3% of the set
pressure).
Seat and/or disc surfaces damages and
reduced discharge capacity that causes a
possible increase of the pressure over than
the fixed limits.
Stop the system and contact Besa Technical
Assistance.
Delayed opening.
Excessive built-up back pressure. The pressure of the plant increases over
than the fixed security limits.
Check the dimensioning of the discharge
conveyance system and contact Besa
Technical Assistance.
Stop the system and contact Besa Technical
Assistance.
The blow down of safety valve is over than
the foreseen limit.
Overheating of the spring because the
construction material is not suitable and
because of the continuous and extended
leakage of the fluid.
Excessive discharge of the fluid and risk of
system stop.
Contact Besa Technical Assistance.
Unsuccessful closing.
Unsuccessful closing. Presence of foreign matters between seat
and disc i.e. due to the fragmentation of
rupture discs.
Loss of dangerous and/or expensive fluids
and system stop.
Contact Besa Technical Assistance.
Rupture of valve-body under stress. Operating conditions don’t match the
design data indicated on Besa Inspection
Certificate.
Loss of fluid and possible damages to
persons or things.
Stop the system and contact Besa Technical
Assistance.
Breakage of valve-body and/or of
connection pipe of the valve to the system.
Stresses caused by external loads, i.e.
thermal expansion.
Loss of fluid and possible damages to
persons or things.
Stop the system and contact Besa Technical
Assistance.
Breakage of valve-body and/or of
connection pipe of the valve to the system.
Breakage of valve-body and/or of
connection pipe of the valve to the system.
Corrosion caused by the fluid type or by the
environment conditions.
Loss of fluid and possible damages to
persons or things.
Stop the system and contact Besa Technical
Assistance.
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