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Sapag Atmospheric relief vAlve type 1100
InstallatIon and maIntenance InstructIons
4 Safety precaUtionS
proper handling, storage, installation,
maintenance and operation are essential to
the safe and reliable operation of any pressure
relief product. the relevant procedures
recommended by sapag and described in this
manual are effective methods of performing the
required tasks. some of them require the use
of tools specifically designed for an intended
purpose. these special tools should be used
when, and as recommended.
this manual contains various safety
instructions which should be carefully read in
order to minimize the risk of personal injury,
or the possibility that improper procedures will
be followed which may damage the involved
sapag product, or render it unsafe. the
precautionary statements given in this manual
are by no means exhaustive. emerson cannot
be expected to know, evaluate and advise
customers of all conceivable ways in which
tasks might be performed, or of the possible
hazardous consequences of each way.
consequently, emerson (emerson) has not
included such comprehensive evaluation,
and disclaims liability for work performed by
other than emerson personnel. All personnel
working with emerson product should be
adequately trained and thoroughly familiar with
the contents of this manual.
the installation, operation and maintenance
of valves may involve proximity to fluids at
high temperature. every precaution should be
taken to prevent injury to personnel during the
performance of any procedure. it is important
to note that emerson cannot evaluate all
conditions that might injure personnel or
damage equipment. however, emerson does
offer the following general safety precautions:
• Hearing and eye protection should be used
when working on a valve which is under
pressure
• Never strike a valve which is under pressure.
premature actuation can result.
• Never stand in front of the discharge outlet
of a pressure relief valve which is under
pressure.
• Always approach and use any pressure relief
valve with great care.
• Wear protective clothing. Hot water can be
present and superheated steam is not visible.
• Before performing any machining on valve
parts, consult sapag or its authorized
representative. Deviation from critical
dimensions can adversely affect valve
performance.
caUtion
Never lift the full weight of the valve by the lifting
lever or the valve gag.
5 Storage anD firSt hanDling
safety relief valves are often on the job site
months before they are installed. Unless
they are properly stored and protected, their
performance may be seriously affected.
rough handling may damage flanges or cause
misalignment of the parts. it is best to leave the
safety valves in their shipment cases and store
them in a dry place under cover until they are
to be installed. flange protectors, sealing plugs
and valve gag should remain installed until just
prior to installation.
Unpacked valve should be moved or hoisted
with a chain or sling using the two lifting eyes
on the top of the body in such manner as will
insure that the valve is in vertical position
during lift.
When safety relief valves are unpacked and
the flange protectors removed, immediately
prior to installation, meticulous care should be
exercised to prevent dirt from entering the inlet
and outlet ports while bolting in place.
While hoisting to the installation, care should
be exercised to prevent bumping the valve
against steel structures and other objects.
6 inStallation
general requirements
for optimum performance, safety valves
must be serviced regularly and otherwise
maintained. so that servicing can be properly
performed, valves should be located in a
manner that allows for easy access. sufficient
working space should be provided around
and above the valve to permit access to the
water ring connections and the visual gauge
indicator. if two or more valves are located
close together, the outlets should be parallel
so as to offer as much protection as possible
to personnel repairing, or working close to the
safety valve.
excessive line vibrations are known to produce
shifts in safety valve set pressures. vibrations
may possibly introduce chatter, causing
damage to the valve and reduce its capacity.
this vibration also contributes to increased
incidents of seat leakage. considerations
should be given to eliminating this problem
prior to installing the valve on the unit.
regarding flanges connections, it is utmost
importance that the gaskets used are
dimensionally correct for the specific flange
and that they fully clear the valve inlet and
outlet openings. Gaskets, flange facings and
bolting should meet the service requirements
for the pressure and temperature involved.
2
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