Pump Head

Joe Mattiello_2

22 gpm @ 6 ft hd is your design I’m assuming the head was calculated with the 1 ¼” pipe. That isn’t bad 4.72 feet per second velocity, and 7.58 frictional loss per 100 feet pipe. Normally staying below 4 fps is preferred in a residential application because of noise, and Erosion issues. The 0010 will deliver the 22 gpm @ 7 ft hd. For your reference I have attached the submittal data information.

Joe Mattiello
Technical Support Technician
Tel. 401-942-8000 X 484
Fax. 401-942-2360
1160 Cranston St
Cranston, RI 02920
joemat@taco-hvac.com

Ron Root_2

Pump Head

A system that requires a pump to move 22 g.p.m. at 6 feet of head has a series 60 pump on the supply. My question is should the pump being on the supply be taken into account? The series 60 just doesn't look right(big). The boiler is oversized for the conditioned space (225k input), and the loop is undersized 1 & 1/4" steel pipe.

Empire_2

60 Series?

Given flow rates are well below the operating performance of this pump. Depending on what pump you have, Yea it is overkill!!!. A series 100 B&G will perform just fine at the given #'s you have provided as long as the head rating is correct.. The pump on the supply is good and remember to "Pump Away" form the expansion tank. With a net out-put of 180M your boiler should have 18gpm flowing thru it @20* "delta t". With 180M output I would rather see an
1 1/2" instead of 1 1/4" pipe. 1 1/4" is rated at 14 gpm and 140,000 capacity. With the current pump, sounds like someone had a flow problem and are trying to jam more water thru the system. Do you hear volocity noise from the pump?

Steamhead (in transit)

Mike's right

I'd pump that system with a Taco 0010, or if you preferred a 3-piece circ with a Taco 110 or B&G 100. If these circs underperform due to the undersized piping you mention, my next choice would be the Taco 0012 or 111 or B&G HV.

I bet you have little or no Delta-T between supply and return with that oversized circ. Right-size the circ and watch the difference.

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Ron Root_2

I didn't really get involved as was there for no-heat (blown fuse, 15 amp). Pump motor amped out fine per name plate, oiled bearing assembly & power pack bearings, cycled fine. Just got hired & was riding along with another service tech. Small house big boiler, fin & tube baseboard. I was just telling him the pump looked too big & expensive not to replace with a different one when it goes. Only 10% of the customers in our area have hydronic/steam systems. So it's a treat when I get a call for those type of systems. But had to go with the flow of the guy I was with as a new hire being shown the way they do things. Didn't hear any velocity noise. If I was by myself I would've looked around a bit more.

Steamhead (in transit)

The pump still might have caused that no-heat

depending on the size of the motor. It probably has a split-phase motor which draws a heavy starting current. If it starts at the same time as other split-phase motors in the system (oil burner, other zone circs if any) and the voltage is a bit low, it might be enough to trip the breaker or blow the fuse.

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