Baker Hughes Consolidated 1811 FA-0-3X1-20, Инструкция по эксплуатации

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Consolidated 1811 Series Safety Valve Instruction Manual
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• Outlet Size
Outlet size is the nominal pipe size of the outlet
passage of a safety valve, unless otherwise
designated.
• Overpressure
Overpressure is a pressure increase over the set
pressure of a safety valve, usually expressed as a
percentage of set pressure.
• Popping Pressure
Popping pressure is the value of increasing inlet
static pressure at which the disc moves in the
opening direction at a faster rate as compared
with corresponding movement at higher or lower
pressures. It applies only to safety or safety relief
valves on compressible fluid service.
• Pressure Containing Membe r
A pressure containing member of a safety valve is
a part which is in actual contact with the pressure
media in the protected vessel.
• Pressure Retaining Member
A pressure retaining member of a safety valve is a
part which is stressed due to its function in holding
one or more pressure containing members in
position.
• Rated Lift
Rated lift is the design lift at which a valve attains
its rated relieving capacity.
• Safety Valve
A safety valve is a pressure relief valve actuated
by inlet static pressure and characterized by rapid
opening or pop action.
• Set Pressure
Set pressure is the value of increasing inlet
static pressure at which a safety valve displays
the operational characteristics as defined under
“Popping Pressure.” It is one value of pressure
stamped on the safety valve.
• Seat
A seat is the pressure containing contact between
the fixed and moving portions of the pressure
containing elements of a valve.
• Seat Diameter
Seat diameter is the smallest diameter of contact
between the fixed and moving members of the
pressure containing elements of a valve.
• Seat Tightness Pressure
Seat tightness pressure is the specific inlet static
pressure at which a quantitative seat leakage
test is performed in accordance with a standard
procedure.
• Simmer
Simmer is the audible or visible escape of fluid
between the seat and disc at an inlet static
pressure below the popping pressure and at no
measurable capacity. It applies to safety valves on
compressible fluid service.
• Warn
See “Simmer” (definition above).
V. Valve Terminology for Safety Valves (Cont.)