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HPS boiler plant

HPS boiler plant

HPS boiler plant

(OP)
This was posted over at HVAC by me:

I am reviewing a set of plans for a hospital boiler plant in PA. The existing boilers are being replaced by a Contractor. There are 3-400bhp-150lb Cleaver Brooks 4-pass boilers connected to a 8"HPS header.

For each boiler there is a stop/check valve on the outlet, ATC valve, short length of pipe then an elbow, then a straight pipe section with a orifice and meter, then a stop valve at the header.

My questions are:

Is it permissible per ASME Sec 1 to put the atc valve and orifice meter between the stop/check and stop valve. The piping between them has to be welded by ASME qualified welders. I haven't seen a detail yet showing a free blowing drain valve per ASME Sec 1 between the stop/check and stop.

I can't think of a reason to put a ATC valve there.

They indicate 2 separate bottom blowdown assemblies complete with quick and slow opening valves. Why 2?

Are blowdown separators or tanks permissible with current codes?

Its been a while since I put in a HP boiler plant.

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