Insitu Seat test of Top entry ball Valve 2

Where is the plug? A drawing would help.

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here I attached GA and see POS 52 the drain plug.

It's not really clear what void that drain plug has access to. So you can't really see if when the valve is closed it will be able to see the fluid inside the valve.

You could test each seat from outside to in, but not really inside to out.

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Also: If you get a response it's polite to respond to it.

That’s not the best design on many fronts...

Looks like single pistons effect seats so you wouldn’t be able to pressurise the cavity and the seat seal.

ESV? Emergency shut-down valve? My recollection is that these are 1 SPE and 1 DPE seat? Seats look the same to me??

You’ve also got a cavity relief hole drilled in the ball? On a clad ball? That’s going to be tricky at best to achieve...