Worm in there or find some young skinny Homey to take a look. Make sure its under 70 psi, go for 50 psi. It also can be the PRV.....
I suggest you move all the Engineering so its easy to get at next time. Sounds like now is the time.
Plumbers charge more when they are pissed at a job. We call it the BS Factor.
I've got this frequent and irritating pipe hammer that appears to be
> originating around the water meter. I live in a four plex with individual
> meters and have been told that it may be the meter.....or.....it may be the
> pressure reducing valve that is before the meter. The hammer can happen, out
> of the blue, when no water is being used in my unit. How can this be? and
> if i do nothing to try and remedy the situation, what are the possible
> problems that could happen with a malfunctioning pressure reducing
> valve?......I know the feeling will be, why not just replace the
> valve.....well, you can't even see the valve, let alone read the water meter
> cuz of it's location under stairs and behind the water heater!! So, i would
> hate to be the plumber that was called to repair it. it will most likely
> require the removal of the water heater first , to get at the
> valve.......thanks for your thoughts....bob
>
>