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Preventive maintenance of Shutdown Valve (SDV)

Preventive maintenance of Shutdown Valve (SDV)

Preventive maintenance of Shutdown Valve (SDV)

(OP)
Dear all,

Shutdown Valve (SDV) are used for isolation of process system in case of emergency.

i) Should a preventive measure (PM) apply on SDV ?

ii) When or what conditions shall we implement preventive maintenance (PM) to shutdown valves ?

ii) Any specific reference or standard governing PM ?

Thanks in advance.

 

RE: Preventive maintenance of Shutdown Valve (SDV)

Is it a control valve (hydraulic, pneumatic, electric), or  a simple hand/motor operated gate valve?

In case of a not human-powered valve there will be some PM, even if this is walking around every month for a visual check.

Even and-operated valves, need some grease or oil, check if there are no packing leaks, and in all cases, check the function of the valve (isolating).

A missing handwheel can be a matter of life and dead, if dealing with steam.

RE: Preventive maintenance of Shutdown Valve (SDV)

(OP)
svanels,
Thanks for your response.

SDV is Emergency shutdown system (ESD) controlled automatic pneumatically actuated ball valve.

 

RE: Preventive maintenance of Shutdown Valve (SDV)

What is the effect if this valve doesn't actuate during said emergency?  It may need some detective maintenance; cycle the valve every so often just to make sure that it will work when/if called on.

RE: Preventive maintenance of Shutdown Valve (SDV)

(OP)
If SDV doesn't actuated (to close) during emergency, hazard could be transferred from one section to another section and potentially lead to catastrophe...

RE: Preventive maintenance of Shutdown Valve (SDV)



A pneumatical operated ball valve will have a risk of 'stickin' increasing torque necessary to loosen and move the ball. The seats may be damaged, the actuator may develop a leak (if not spring return operated) the solenoid valve for the actuator may be the weakest part if not especially selected for high quality or in redundance combination.

Dependability is of course given as a combination of quality and dimensioning (oversizing, mechanical safety factors) of the equipment.

Tests should be done for this whole ESD combination at a weighing between 'worst case scenario consequences' if failing and cost of test, if the test sequence is not given in any other way.

Sequence: testing at each startup, not less than once a month for good safety measure, at least not less than each quarter.

Changing of soft sealing components of actuator and ball valve after suppliers recommendation. Do not forget the solenoid valves including coils and contacts-

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