pump failures on hot water loop off steam boiler


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Old 03-01-15, 01:47 PM
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pump failures on hot water loop off steam boiler

I have 175,000 gas steam boiler with 2 hot water loops heating new additions on house.Im burning out 1 Taco 007 circulator each year for last 3 years.Would a
B&G series 100 fare better?
 
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Old 03-01-15, 02:02 PM
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No, unless you got a BRONZE series 100.

What's killing your pumps is the oxygen in the water.

Cast iron pumps are only intended for use on CLOSED (which your steam system does not qualify as) hot water systems. These systems are devoid of oxygen in the water after a couple weeks of operation.

Also, the water in a steam boiler is more acidic than hot water boiler water.

Switch to bronze and you'll get longer life.

The piping for the hot water loops should also have BYPASS piping on it so that the water isn't hot enough to flash to steam.

Are these loops ABOVE the water line of the boiler?
 
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Old 03-01-15, 02:07 PM
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Read this article......................

How to Run a Condensate Zone Off a Steam Boiler

This one is basically the same thing, but Q&A style:

https://heatinghelp.com/systems-help...-steam-boiler/
 
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Old 03-01-15, 02:23 PM
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killerkane

I tried taco bronze with no luck.I didn,t know B&G 100 made a bronze.A by pass from supply to return is installed.Hot water loops are feeding rooms on first floor
and boiler is in basement.I installed a new taco Thursday and it's getting noisy already.I removed return plug from boiler and found a lot of mud in boiler sections.
 
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Old 03-01-15, 02:39 PM
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I didn,t know B&G 100 made a bronze
Sure... it's pricey though!

106192LF - Bell & Gossett 106192LF - 1/12 HP, Series 100 AB Bronze Circulator Pump

A by pass from supply to return is installed
Is the bypass adjusted properly?

Hot water loops are feeding rooms on first floor
OK, but I don't know your home... does that mean that the boiler is in the basement and the hot water loops are above the water line of the boiler? Or, is it a rancher with the baseboards on the same level as the boiler?

Are there also the flow check valves that the article talked about?

I removed return plug from boiler and found a lot of mud in boiler sections.
How often are you blowing down the boiler?

You should read this book:

We Got Steam Heat!: Dan Holohan: 9780974396002: Amazon.com: Books
 
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Old 03-01-15, 03:50 PM
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Am I correct in assuming it is the MOTOR of the Taco pumps that is failing? I would not be surprised to learn that, especially if you have a lot of suspended solids in the boiler water. (How often do you "blow down" the boiler and how much "make-up" water does it use?)

I would recommend a three-piece pump in this situation to keep the heat of the boiler water away from the motor. The B&G pump Trooper linked to would be good.
 
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Old 03-01-15, 05:02 PM
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I have a theory: perhaps the pump is being partially clogged with gunk (due to lack of boiler blowdown), thus increasing motor amps and temperature.

I would try another cast iron pump, but 3-piece. A 3-piece pump, with a separate pump/impeller section, should be more resistant to gunking up than a wet-rotor pump. Cast iron should be OK with oxygenated water. What type of materials are used in your piping and boiler? Not bronze, of course, or else you are sitting on a gold mine
 
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Old 03-01-15, 05:22 PM
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I have no opinion about this problem, there are enough there now.
I just want to add that I've installed my share of both indirects and hot water zones off of steam and used nothing but cast iron pumps without any problems and never replaced one yet.
Gil is on the tight track. It's not the cast iron that's causing the problem.
 
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Old 03-01-15, 07:03 PM
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I always use a bronze 3 piece or a stainless steel 1 piece pump. In early days I lost a bunch of cast iron pumps also. I usually add a strainer also before the pump.
The pump should be pumping away from the boiler and as Trooper stated a bypass to blend down the supply water temperature to the heating loop.

Make sure the circulator is near the floor. For more info check this site. Keeps the steam out of the pump.
Follow this link for more info.

Piping an Indirect or heat zone to a steam boiler
 
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Old 03-02-15, 07:16 AM
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Sure cast iron may work... but 'best practice' is to use bronze for longer life.
 
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Old 03-02-15, 08:52 AM
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killerkane

I'm blowing boiler down weekly till water runs clear.
By pass is open 20% I'm going to take water temp going into pump this afternoon
hot water loops are above boiler water level.
Anybody know of a boiler cleaning solution to clean some of the gunk out.
want to cover all bases before I go for a B&G bronze 100 got a price for $800
 
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Old 03-02-15, 09:13 AM
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You looked at that link I posted, yes?

Significantly less than $800 ...
 
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Old 03-02-15, 09:20 AM
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killerkane

found one for $512
Thanks for the help
 
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Old 03-02-15, 10:07 AM
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rbeck said:

Make sure the circulator is near the floor. For more info check this site. Keeps the steam out of the pump
Where are the pumps located, relative to the water level of the boiler?
 
 

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