Pipe Size from Feeder Pump to Multiple Boilers??

JUGHNE

I will have 2 boilers with solenoid controls fed by a single boiler feeder pump.
(ShipCo 60-DMS-MU1; 1/3HP; 6 GPM @ 10 PSI; 34 gallon tank)

I was thinking of using 1/2" black pipe from the pump to each boiler.
(M&M 150 feeder/LWCO controls on each)

I have another site with the same pump feeding 2 slightly larger boilers that sends water thru 3/4" blk pipe too quickly and knocks the steam down. It has a nearly full port 3/4" bypass from pump discharge directly back into the tank. There are 2 throttling ball valves on each boiler plus the drop thru 3/4" electric valves. It still fill too quickly.

I thought 3/4 at the pump reduced to 1/2" to each boiler might knock the flow down better. Boilers are PB-05L with 12.4 gallons of water and PB-04, 10.8 gallons.

If 3/4" is highly recommended then how about 3/4" hard type L copper? (my stock cost less than 3/4" blk pipe does today).........also have old stock of 1/2" black pipe.

Trying to empty shop of old stock.....this is probably my last major piping job.

Jamie Hall

Unless the runs are very long, 1/2 vs. 3/4 isn't going to make that much difference...

How about using a globe valve on each run? They can throttle more effectively than a ball valve (I know -- pain in the neck to maintain,, but.)

Or just get a less enthusiastic pump?

JUGHNE

The runs are pretty short, 4-6'.

In addition to isolation ball valves, I was going to try iron gas cocks, sometimes referred to as "I bibs", IIRC.
They have the slotted tapered plug, that rotates only 1/4 turn.
Heavy iron seems like it should not wear down like ball valves.

This is the smallest pump available, least GPM.
Unique pump tank is only 9" tall, 30 X 30 square. Needed as inlet is 6 1/2" AFF, existing true "dry" pipe is 9" AFF. 2 pipe system. F&T on EOM....2" return.

Thanks for your input Jamie.

I am sure all of us are thankful and remembering the reason for long week end.

EBEBRATT-Ed

I would use the 3/4 copper. If you put in 1/2" and it's too small your stuck. 3/4" with a valve in it to throttle the flow would be better IMHO

dopey27177

Dole makes in line flow control valves 1/2 & 3/4".
These are inline orificed fittings fixed at a specific flow rate.
Can be had from 1/2 gpm and up/

Jake