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Re: Water hammer
Posted: Fri Apr 25, 2014 10:16 pm
by marinesteam
swedtug wrote:the engine is fairly well insulated, I have even isolated the underside of the cylinders, so think not that I am getting condensation from there. but have had problems with priming in the boiler. in times when oil separation has been failing in the hotwell.
but that has not happened since I cleaned the boiler last time.
the needle on the pressure gauge behaves similarly when sound is heard as it is silent. It shows between 1.5-2.5 kg 20-36 psi of pressure .
improperly sized receiver is very possible, douse I have designed everything without any drawing.
Is the needle steady, or erratic? There should be pressure spikes if it is indeed a water hammer (hydraulic shock). You implied that this started when the gauge was installed in the wheelhouse. Is it possible that the line to the gauge is slapping against something or flexing the case of the gauge?
Ken
Re: Water hammer
Posted: Sat Apr 26, 2014 10:30 pm
by swedtug
the needle is not steady, its moveing, with pressure in the reciever,
and it sounds like the sound is coming from the pressure gauge.
I know that it is not so,but it is what it sounds like. I have observed the tube but nothing that seems to be lose.
Re: Water hammer
Posted: Sun Apr 27, 2014 1:55 am
by DCSmith
Could you try a glycerin filled gauge? How fast does the needle move?
Re: Water hammer
Posted: Sun Apr 27, 2014 5:10 pm
by barts
The liquid-filled gages are much more rugged; I've switched to using them on Otter as I've had problems with the ordinary variety failing after several years of trailering.
- Bart
Re: Water hammer
Posted: Sun Apr 27, 2014 6:31 pm
by Oilking
A few points:
1. If you disconnect the gage from the receiver does the sound go away?
2. If water hammer is the cause, in a dry gage without a snubber, the needle should be bouncing all over the plce with each "hammer" event.
3. Trouble shooting is not looking for what's wrong, but eliminating what is not.
Steam on
Dave
Re: Water hammer
Posted: Sun Apr 27, 2014 7:36 pm
by Lopez Mike
Here! Here!
Re: Water hammer
Posted: Mon Apr 28, 2014 8:31 pm
by swedtug
Thanks for all the answers and tips, I'm going to continue to trouble shoot , start with the timing of LP slide valve i Think.
I've noticed that the valve seems to leak.
Re: Water hammer
Posted: Wed Aug 13, 2014 10:00 pm
by Double Dutch
I think your waterhammer has nothing to do with your engine, it might be produced in your impulse line.
I have heared it at a Dutch steam tug, also the the receiver gauge.
After draining the impulse line the sound was gone.
A loop in your impulse line near the receiver, to keep your line filled with condensate might help.
Re: Water hammer
Posted: Thu Aug 14, 2014 4:56 pm
by swedtug
Thank you Double dutch that sounds like a good solution. but the problem is almost gone since I adjusted and removed some shims at the exenter driving the LP valve. all the endplay made the valve a litle off in timing.
the gauges in the wheelhouse, with the LP gauge at the right
Re: Water hammer
Posted: Sat Aug 16, 2014 8:12 am
by johngriffiths
Are the pipe to nipple joints silver soldered?
JohnG