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Water hammer/ Hardford loop

Norm Harvey
Norm Harvey Member Posts: 684
in THE MAIN WALL
Post some pictures of the loop and near boiler piping, and we can better identify any problems.



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Comments

  • John Milette
    John Milette Member Posts: 8
    Water hammer/ Hardford loop

    I am getting a lots of water hammer in the hardford loop. Does any of you guys have and advise for this problem?

    Thanks, John
  • Patrick Linhardt, \"Linhardt's Field Guide to Ste
    Patrick Linhardt, \"Linhardt's Field Guide to Ste Member Posts: 152
    things to check

    Hi John,

    Water hammer in the Hartford loop can happen if the horizontal portion is too long or positioned too close to the waterline. Every manufacturer recommends the horizontal portion to be at most a close nipple. Anything more than that gives the potential to set up water hammer. It is also generally agreed that the horizontal portion should be between 2 to 4" below the normal waterline. I like 2" for gravity return and 4" for pumped return, but thats just me.

    Does the hammer happen when the pressure is the highest, like the end of a long burner run cycle?

    Best regards, Pat
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