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Baker Hughes
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Know all valve exhaust/
leakage points to
avoid possible severe
personal injury or death.
installation. Proper adjusting ring position can then be recorded and
maintained when valves are serviced.
Vent and drain piping should have a union connection to facilitate valve
removal or servicing in place (Figure 4.)
B. Outdoor Safety Valve Installation
Safety valves operating under the best possible conditions (i.e., favorable
operating gap, relatively stable ambient temperatures, the absence of dirt
and in relatively still air) will provide the maximum degree of safety, tightness
and dependability.
When a safety valve is installed in an outdoor location, it may be exposed to
wind, rain, snow, ice, dirt and varying temperatures. Therefore, the following
recommendations are made for proper protection and to ensure that
operational dependability can be restored to a level near that of the valve
installed under ideal conditions:
The inlet neck of the safety valve and safety valve body, up to the top of the
base, should be insulated. The exterior surface of any such insulation should
be made weather-proof by any suitable means. In addition to maintaining
a more even temperature within the valve body, especially during widely
fluctuating ambient temperatures, this insulation will effectively reduce
thermal stresses due to high temperature gradients through the walls of the
safety valve nozzle.
Spring covers should be used to stabilize, as nearly as possible, the
temperature of the spring to prevent the accumulation of snow and
ice between the coils of the spring and to prevent dirt and fly ash from
accumulating between the coils of the spring.
Lifting gear covers should be installed to prevent ice, dirt and fly ash from
accumulating in areas inside the safety valve cap.
C. Indoor Safety Valve Installation
Indoor valve installations should have inlet necks insulated only up to the
underside of the valve body. Considerations should be given to ambient
temperature changes greater than 100°F (37.8°C), because of possible set
point changes that may occur.
XI. Recommended Installation Practices (Cont.)
