Overhaul needs on API6FA Valves 1

[KjetilK]

Currently I am working on a mantenance program for an export oil pipeline.

In discussions with suppliers of valves (16" side monted on/of ball valve, type with trunnion mounted ball valve, direct action), there is no clear answer to if there should be a defined interval for overhaul of these valves.

There is only a description of periodical functional tests of the valves.

Does anyone know if there is a requirement in API or equial for such overhaul/classing interval for such valve?

Regards KjetilK

 

[BigInch]

depends on fluid properties and corrosiveness, pressure, temperature, velocity and erosion, installed location and the frequency and service, i.e. if used for throttling, don't expect it to last long.

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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[KjetilK]

Operating temperature is 60 degrees celcius. Operating pressure is 4 bar. Fluid is crude oil with relatively high content of sulfur.

KjetilK

 

[BigInch]

Velocity + sand = possibility of erosion
Partially Open = erosion, cutting, wash out of lubrication, sand trapped in seals, ring wear.
Heat = deterioration of elastomerics
Water + sulfur + oil = possibility of sulfuric acids and internal corrosion.

If the above is assumed to have minimum effect, check yearly. Moderate, check every 6 months. If severe, check every 3 months.


**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/