Consolidated 19000 Series Safety Relief Valve Instruction Manual
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V. Terminology for Safety Relief Valves (Contd.)
9. Operating Pressure
The gauge pressure to which the vessel is normally
subjected in service. A suitable margin is provided between
operating pressure and maximum allowable working
pressure. For assured safe operation, the operating pressure
should be at least 10 percent under the maximum allowable
working pressure or 5 psi (.34 bar), whichever is greater.
10. Overpressure
A pressure increase over the set pressure of the primary
relieving device. Overpressure is similar to accumulation
when the relieving device is set at the maximum allowable
working pressure of the vessel. Normally, overpressure is
expressed as a percentage of set pressure.
11. Rated Capacity
The percentage of measured flow at an authorized percent
overpressure permitted by the applicable code. Rated
capacity is generally expressed in pounds per hour (lb/hr) for
vapors, standard cubic feet per minute (SCFM) or m
3
/min for
gases, and in gallons per minute (GPM) for liquids.
12. Relief Valve
An automatic pressure-relieving device, actuated by static
pressure upstream from the valve. A relief valve is used
primarily for liquid service.
13. Safety Relief Valve (SRV)
An automatic pressure-relieving device used as either a
safety or relief valve, depending upon application. The SRV
is used to protect personnel and equipment by preventing
excessive overpressure.
14. Safety Valve
An automatic pressure-relieving device actuated by the static
pressure upstream of the valve, and characterized by a rapid
opening or “pop” action. It is used for steam, gas, or vapor
service.
15. Set Pressure
The gauge pressure at the valve inlet for which the relief
valve has been adjusted to open under service conditions. In
liquid service, the inlet pressure at which the valve starts to
discharge determines set pressure. In gas or vapor service,
the inlet pressure at which the valve pops determines the set
pressure.
16. Simmer
The audible passage of a gas or vapor across the seating
surfaces just before “pop.” The difference between this start-
to-open pressure and the set pressure is called “simmer.”
Simmer is generally expressed as a percentage of set
pressure.
VI. Handling, Storage
Handling
Valves should not be shipped with the inlet flange down.
These valves should be kept in their factory foam-filled car
-
ton until installation.
ATTENTION!
!
Never lift the valve by the lifting lever.
ATTENTION!
!
Handle carefully. Do not drop or strike the valve.
Do not subject SRVs, either crated or uncrated, to sharp
impact. Ensure that the valve is not bumped or dropped
during loading or unloading from a truck. While hoisting the
valve, take care to prevent bumping the valve against steel
structures and other objects.
ATTENTION!
!
Prevent dust and debris from entering inlet or
outlet of the valve.
Storage
Store SRVs in a dry environment and protect them from the
weather. Do not remove the valve from the skids or crates
until immediately before installation.
Do not remove flange protectors and seating plugs until the
valve is ready to be bolted into place during the installation.
Screwed/portable valves should be kept in their factory foam-
filled carton until installation to avoid damage to external inlet
threads.
Summary of Contents for Consolidated 19000 DA
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