Good catch, as I was only looking at the stuff in the foreground.

I guess this installation could have been only temporary, but still there's something else odd about it.

Paul

I did not catch that there are two missing. It looks like an offshore platform. The inlet side uses those graylock type clamps instead of flanges.

You are correct that it is an offshore installation.

 Just checking with the Mac, works OK.

The outlet flange of the PSV does not seem to match that of the ball valve flange, they may be of different ratings.

The block Valve on the outlet of the PSV is unusual because you ordinariy want no shutoffs in the outlet piping unless there is some other way of preventing overpressure....  see B3.31.3 and Section VIII Div 1 UG-124=5 (c), UG-126-128 etc etc.

Maybe there is an interlock system on the PSV's. That might explain the valve in the exhaust line.

Raymond

At first glance, I see no way to do PSV maintance work.

Reducer on the inlet of a safety valve?

i think it is eccentric  reducers couz it gas line

so it must be eccentric one in horzental diraction