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.
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.
