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Post by Nexuas on Jul 5, 2006 13:04:05 GMT
OK I have completed the new Boiler for my 3 1/2" RUSSELL, (in a little over seven weeks start to finish) I had the hydraulic test last thursday which it passed (second attempt).
I have spent all day saturday and sunday and most of monday and tuesday night putting the thing back together, to the point I could steam test it last night, first by sticking a blow torch in the fire hole door and heating to get a few PSI in it, this relealed a leak round the regulator gland and on one of the guage glass flanges, so dismantled regulator and repacked gland and put some hermitite green on the flange.
Second attempt on wood fire, was fine upto 40PSI when a leak appeared round the bottom flange of the other glass, the water level fell moderatly quickly, so tried the injectors neither would pick up... (60PSI) Well I say they did not pick up, but they sounded like they were running but loads of water was coming out of the over flow and the water level in the glass continued to drop... Seamed odd neither injector would put water in the boiler
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Post by greasemonkey on Jul 5, 2006 15:16:20 GMT
Hi Nexuas
Well done on building your own boiler. I like to do a hydraulic test on my boilers to working pressure after mounting the fittings to check for leaks.
Injectors can be awkward to get working,but at the risk of teaching granny to suck eggs have you made sure all bends in the pie work are as of large a radius as possible with no kinks, that you havent got any air leaks in the water pipes or valves and that the delivery pipe isnt blocked (i had to unblock mine last night after not having used it for 5 weeks) and that the clack valve has enough lift and the ball can not block the exit into the boiler. Are you switching the water on before the steam? Some injectors will work either way but some have to be worked this way, what make of injector are they?
Try the injector itself by disconecting the delivery pipe from the outlet, turning on the steam and water supplies and you should get a jet of water if you dont then the problem lies in the supply side, if you do then you have a problem on the delivery side.
let us know how you get on.
Andy
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mott
Hi-poster
Posts: 151
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Post by mott on Jul 6, 2006 11:31:44 GMT
Hi Nexuas, Just a thought based on personal experience, you can fit injectors the wrong way round quite easily. The water feed should be before the overflow, obvious of course but easy to do it the wrong way round the first time of fitting. Mott
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Post by Nexuas on Jul 6, 2006 15:50:19 GMT
Cheers for the reply, I have re-read my question and there does not seam to be a question there...
I will try disconnecting from the injector towards the boiler to see what happens. I assume all the pipe work must be OK as I am refitting exactly what was on the engine before. My suspision is that the feed pipes are blocked at the boiler flange due to some over zelous use of Hermitite green during the hydraulic test and then again on reassembly. I will take the injector turret off and clean up the flange and try and blow the feed pipes through with some compressed air. I think Meths will remove the hermitite?
Will citric acid dissolve any scale in the injectors/clacks? or Do I need to get kettle descaler? When I was looking for a source of citric acid most places pointed me to the descalers...
Iwas was a shame as I was hoping to get the model steam tested this evening, but a heavy week at work has put pay to that, I was hoping to only do a half day today but am still here...
It is fairly important to get the injectors as relible as possible as the these are the only means of water feed to the boiler, I am looking at fitting a hand pump, but I will not get round to this till the autumn and I was hoping to get it in steam for the end of July so I could take it to the WHR(p) RUSSELL 100 not out birthday celebrations. This is now looking rather unlikely...
Cheers Greasemonkey for the comment, I was please to get it complete without too much hassle and I am sure the next one will go together much easier (Lilla in 3 1/2") Even our boiler inspector ate his words when I had it complete for testing so quickly...
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Post by greasemonkey on Jul 6, 2006 19:12:14 GMT
Hi Nexuas
Citric acid will work fine for descaling injectors, personally I use kettle desacler as I find it easier to get hold of. I know the feeling, ive only just got back into the workshop today for the first time in 5 weeks due to work.
It was very satisfing when I built my simplex boiler to have it pass its hydraulic test and after today it shoudn't be long till the steam test, just got the water gauge to make now. next boiler to be made is for my B1.
Andy
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