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Hi, I am having trouble shooting water hammer I am hearing from one radiator. I have all of Dan's books but can't get this one. I have a one pipe steam system, main insulated except for the room in picture where it provides heat, pressure less than 2, mains have gorton 1's. The one inch pipe in the middle of the room goes towards the dining room and has water hammer near the location where the supply valve connects, very loud when the boiler fires multiple times such as the current cold weather we are having. Over 32 degrees, i don't hear it that much. Before I had a sag where the T connects to the main pipe. I strapped to try to level it. The banging sound became a little less because of it but it still happens. The radiator had a Gorton 5 that I changed to Gorton 4, instead of banging all the time, its only when its real cold outside. I have a White Rodgers thermostat but I can't control the cycles per hour on it. I know one per hour is ideal. Should I change the Gorton 4 to a Gorton 3 on the radiator? Should I change the thermostat? What do you guys think? It's only one radiator that has banging issues, i have a total of 9 radiators. As always, your help is appreciated. Thanks.
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EcoSteam ES-20 Advanced Boiler Control
Boiler pictures updated 2/21/15
https://www.facebook.com/media/set/?set=a.10202744301871904.1073741828.1330391881&type=1&l=c34ad6ee78
And I would be astonished if there was enough pitch on that runout.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
1)Yes the radiator is bushed down from 1.25 to 1 inch at both the main and radiator. That was a sharp eye.
2) Supply value, brand new, fully open. Radiator pitched towards supply pipe, verified with level.
3)Picture of radiator and valve attached.
4)Where the pipe runs, there's no sheet rock there, hard to see from pic but i have space to push up. I will try this. The only hard part is, the pipes turns after it goes into the closet then goes to back of house but i should be able to get a pitch.
So what are my solutions:
1) Can a plumber cut out that bushing and replace it with a 45 degree 1.25 elbow and replace the one inch pipe with 1.25 pipe?
2) Do i take out the reducing bushing at the radiator and replace it with some other type of reducer from 1.25 to 1 inch?
3) Pitch the run which as much as a i can which i will this weekend.
The second choice is to take that bushing out of the radiator and put a 1-1/4 valve and spud on that radiator so water doesn't pool at that spot. You can then bush the bottom of the valve down to 1" to fit the existing pipeand that won't let water pool there. I don't like this approach because the supply pipe is still just 1" when the radiator was obviously sized for a 1-1/4' supply.
EcoSteam ES-20 Advanced Boiler Control
Boiler pictures updated 2/21/15
https://www.facebook.com/media/set/?set=a.10202744301871904.1073741828.1330391881&type=1&l=c34ad6ee78