Valve Maintenance in absence of spares

[GAL02]

Dear all, Good afternoon !
Regarding the subject matter for any type of valve which may be passing, trim damaged, block etc.
and if we don't have spares in hand then what is more preferable 1) to open without spares in hand? 2) to keep as it is till spares available?
pl. discuss the consequences in both case.

With regards

 

[Danlap]

Dear GAL02,

Kindly bare in mind, that every-time you Open valves, it is highly recommended if its not mandatory to replace the soft goods. This includes Packing, Body to Bonnet Gasket, O-Ring, lip-seal, etc.

For manual valve might be do-able, but not recommended for Control valve. Control valve always advisable to use OEM parts or in some case re-engineered parts
Control valve is somehow more complicated and its performance related to dozens of factors. Shall incorrect (read: Standard market) packing installed, ones might change the performance factor e.g. friction, hysteresis, torque value, etc.

For commodity valves used for not so critical and dangerous medium e.g. water, steam, etc. its might do-able.
Commodity valves normally use standard packing.
Not to simplify but, All you have to prepare is packing (various sizes and thickness), manual IOM book (to know the torque value, etc.), welding (shall require to do welding activities) and lapping machine (if not do by hand)
Applying non approved OEM parts for critical and hazardous medium valves may lead to many consequences you could ever imagine plus no warrant from the manufacturer side.

Better to keep it as it is until spare available.
Why?
- If this is commodity valve, better to replace is for valve as a whole. most cases, its not ever worth to maintain it
- Unless the valve is stuck, no body really care shall water or steam a bit leaking for standard line
- In most cases, when ones open valves lot, unexpected things occurs which resulting unprepared tools required
- Once somebodies touch the valves, and wrapped it up again in whatever condition. End user always assume that its already fixed.. the last one who touch in (recorded in the log book) is responsible for its condition (unwritten norm)

Regards,
MR

All valves will last for years, except the ones that were poorly manufactured; are still wrongly operated and or were wrongly selected

 

[GAL02]

Dear Mr. Danlap, Good evening!
Thanks a lot for your valuable inputs.

Will come back to you.

With regards