Again, pressure is of little consequence in water hammering. You can get a
nice bang out of 4 psi if you stop it suddenly.

s


"dpb" wrote in message ...
But if it hasn't been an issue previously, it's a good indication there
may be a pressure problem now...it's the first thing to check as I said.
If that turns out to not be a problem, then the next step is to see if
there are any accumulators in the system or not -- most houses don't have
any and are fine w/o them. If OP's is in that category, he didn't have
hammer before and does now, then they're not the culprit--may as well find
that out before searching further.

--