Member postings for STEVE mirfin 1

Thanks Paul, Yes it runs via air supplied via S/V boss. Taking advice previously given this morning i checked the with soapy water (pressurised air not steam) and found the super heater header flange leaking when opening the regulator and suspect a little air leak at the bottom of the boiler/ smoke box ring judging by the lack of sealant in one spot. Would this explain the fire was dull and seem a long time to get pressure up?

So now I will have to reassemble and try again. I will of course keep you informed. Thanks again, Steve

Thanks Martin, I never thought of that, I was so concerned about lapping the surfaces. I did think I left sufficient clearance but i will bear that in made if I take them apart yet again.

Steve

Thank you Simon, Nigel, Brian , Julian for your comments I will reread and study them all and take them all into account.

I put springs under the valve nuts (after reading a comment on a forum) because I was experiencing blow through the chimney at the same time I lapped the valves onto the port face to best of my ability!

I suspect Julian may be right as the pressure loss is dramatic and continues to fall but runs on steam at 15/20psi.

Steve

Thanks Nigel for your comments, The springs are to keep he valves on the port face. Pressure loss is when loco on blocks, notching up does slow down the pressure loss.

I have made a 3.5in Rob Roy and it has passed the boiler test with fittings. On air it runs easily on 15 psi. However when on steam I open the regulator at 80psi the boiler pressure drops away quickly. I have put springs under the valve nuts and raised the blast nozzle. Has anyone got suggestions to solve this problem?