what would be the hydrostatic testing pressure on a G3 boiler, I get to 75psi befor the relief valves blow.
do I need to gag the reliefs to go higher ?
Hello Peter,
Normal procedure for boiler testing is to have a set of blanking plugs - for all the bushes for the safety valves, water gauge, pressure gauge, etc., except one bush which has a fitting to connect to the test pump.
These are used when doing the hydraulic test to 1.5x or 2 x working pressure (sorry, I don't have the required figure to hand, but no doubt someone will soon post to correct me).
The model pressure gauge is also tested against a master calibrated gauge whilst off the loco.
Once that is done, the fittings are all put back for the steam test - during which the safety valve opening pressure is checked.
Hope this helps,
Andy
Thanks Andy,
I left the relieve valves it to check the trip pressure. Maybe they need replacing too. I don't know what the running pressure is for G3 models, so any help please.
Peter
I believe the normal working pressure is under 80lbs for g3 models. The person to talk to is Dick Allan.
I drive a lot larger engines on a 7 1/4 guage line near Ringwood and we operate boiler pressures on a range from 100-150lbs on the various engines.
Mark
The best person to speak to is Alan Marsden. He is the G3S authorised boiler tester, so what he says goes.
Mike
Ok!, where and how would I get hold of Dick or Allan ???
Assuming you are not a member of the Gauge 3 Society and thus don't have access to a membership list, drop a note to any of the committee whose details are on their web site. I'm sure they will put you in touch one way or another.
.... and I would recommend you join the Society - its inexpensive and greatly motivating.
Mike