Pump /pipe noise

eleft_4

How about a differential pressure regulator in a loop back to the return after the pump? Then you can set the flow that works quietly without all the complex stuff.


al

Dan m_2

Last heating season my installer installed a Taco circulator pump on my 2 pipe hot water heating system. The pump is a model 0011-f4 1/8 horse 3250 rpm. The pump replaced a smaller Taco pump that did not circulate as well . The new pump also runs 24 hrs a day . The pipes were large old gravity system but are now a 1 inch copper system. The smaller pump made no sound .The new pump sends a hum throught-out the house and makes a very fine vibration in the pipe. The "Pro" has gone on to bigger jobs and gave up. I have placed rubber spacers wherever the pipes might contact anything. Is their anything I can do to reduce the noise( add somthing inline to dampen etc)The smaller pump might work with my new pump

John Abbott

0011

The 0011 circ is a high head high volume circulator that we frequently use on commercial radiant jobs. It sounds like you are getting velocity noise which is very common with misapplied 0011 circs. It sounds like you should consult a local hydronic proffessional.
John

Steve Ebels

Details needed........

You didn't say how many btu's you're trying to herd around your piping. Also approx length of the longest run of pipe would be good to know. What was the model of the pump that was replaced? With this info we can take a pretty good guess at what should be on your system.

I'd bet my best hat (it ain't worth much) that the 0011 is WAY too much pump for your application. If you have a high head (a lot of restriction) piping system you may need a 009 which is lower flow rate{less gpm} but will still circulate through a long piping run.

Get it made right because you can actually erode your piping over time with excess flow velocity.

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[Deleted User]

steamhead has a really good article on this

its located in the HOT TECH TIPS section to the left. i believe its called ''sizing circulators for hot water heating'' ---january 2002.

Dan Peel

Turn it down

The 0011 is a great pump, but sometimes it can set up system harmonics. Two low cost options are available that may solve your problem. By installing a rheostat (think dimmer switch) you can turn the flow down a little, this usually works. Another option would be to throttle the flow - unless the piping system contains a great deal of very restrictive piping the circ may be trying to run ahead of it's curve, inducing head can often pull it back into balance. Enjoy...Dan

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kevin

are the key words...

Gravity conversion. I thought you would be trying to mimic gravity flow? Wuold not a Taco110 or B&G series 100 be beter better choices in pumps. The 0011 will have way to much head. Check out the Q&A section of the website under gravity heating. kpc

Steamhead

Thanks, Gerry

for the kind words!

Dan M., on a residential job I'd tend to agree that the 0011 is too big, but before passing judgement we need to know the following:

1. Amount of radiation in square feet (EDR). If you're not familiar with these ratings, get Dan H.'s book "EDR" (available on the Books and More page of this site) which almost certainly has your rating charts in it.

2. Piping details. Is that 1-inch copper you mentioned just connecting the boiler to the big old gravity mains, or did they repipe all the mains with the 1-inch copper?

3. Then go to the article Gerry mentioned (on the Hot Tech Topics page of this site) to see how much flow you need, and select a circulator that will produce the proper flow.

Most of the circulators I've seen on old gravity systems are oversized- some severely so. I put a smaller circulator on my own system and will be installing a slightly smaller oil burner nozzle this year- that's how much difference it made!

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Dan M

More info on noisey system

The boiler puts out 140000 btu the longest run of pipe is approx about 40 feet one way . I tried to lower the flow by shuting a valve ahead of the system circulator( PARTIALLY) but the noise remained.

Phil Steiner

In addition to a lower head pump, you might think about reducing the RPM to 1750, or 1150. A 3500 RPM pump is pretty fast, and can result in noise throughout the system.

Dan M

Thanks everyone for all the ideas

Your right steamheads article is well written and full of info.
I greatly appreciate everyones help

Steamhead

Thank YOU, Dan

for the rave review!

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