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Boiler Test Fitting

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Shaun Johnston29/05/2021 12:58:21
5 forum posts

Hi all,

I recently picked up a not bad looking 3.5 Rob Roy and I'd like to perform a hydro test on the boiler. I have a rothenberger hand pump with a 1/2" bsp fitting but I am struggling to find an adaptor to fit it to the boiler. Can anyone suggest to me where I could find such a fitting?

Regards

Shaun

David George 129/05/2021 20:53:43
avatar
1677 forum posts
497 photos

Any hydraulic pipe supplier can make one with the adaptors from Rothenberg pipe to the bsp fitting on the boiler or you can make an adaptor with bsp on one end and the fitting size on the other.

David

br29/05/2021 21:01:13
697 forum posts
3 photos

Joe at Maccmodels lists boiler blanking plugs.

I have bought from him before and just drilled a hole in the plug and soldered in a brass tube and conneted to pump.

bill

Paul Kemp29/05/2021 21:12:19
696 forum posts
18 photos

Just to be clear that would be a very unusual Rob Roy if it has a BSP thread on the boiler David. The likely threads will be 26tpi, 32tpi or at a push 40tpi and to the best of my knowledge you won't get a fitting from an industrial source in any of these threads. Usual way to address this is to make your own. However as pointed out by br you will probably find something that can be adapted from one of the model engineering suppliers. Measure the OD and the thread pitch and then have a scout around the web sites.

Paul.

br29/05/2021 21:36:46
697 forum posts
3 photos

Paul is spot on with thread pitch

Safety valve bush is 5/16 by 26 tpi which should do you ok

bill

Bill Dawes29/05/2021 23:01:39
494 forum posts

I don't think Shaun said 1/2" BSP on the boiler, he was referring to the pump. Easy enough to make an adaptor, assuming you have a lathe of course.

Bill D.

br30/05/2021 07:21:02
697 forum posts
3 photos
Posted by Bill Dawes on 29/05/2021 23:01:39:

I don't think Shaun said 1/2" BSP on the boiler, he was referring to the pump. Easy enough to make an adaptor, assuming you have a lathe of course.

Bill D.

That it is how I understood it.

I suggested a blanking plug in case he did not have a lathe.

Can always ask my boy to make you one if it helps..

bill

Shaun Johnston31/05/2021 15:03:55
5 forum posts

Hi guys,

First off thanks for all the advice, great community!
Yes I should have been more specific, the fittings on the rob roy are as standard and I think the smallest reducer I have for the pump is 1/4bsp.
I don’t have access to a lathe at the moment, I’m hoping to join my local club but might be a while till I can get along there so I’m stuck with trying to source the parts for now.

I had a search online and found this,

**LINK**

Would this be of any use?
You’ll have to excuse my complete ignorance of measurements I’m quite new to model engineering!

Regards

Shaun

Clive Brown 131/05/2021 15:16:28
723 forum posts
34 photos

Your linked connector isn't suitable. 5/16" JIC is 24 threads per inch. I don't know the RR boiler design, but I'm certain that it won't have any 24tpi threads in th bushes if its to ME standards.

Redsetter31/05/2021 16:19:41
192 forum posts
3 photos

Can I point out that the loco's own hand pump is perfectly adequate for a basic hydraulic test?

Edited By Redsetter on 31/05/2021 16:27:27

Shaun Johnston31/05/2021 16:33:14
5 forum posts

I did think that connector was a long shot, In regards to the side tank pump, I had considered that and tried it briefly but if anything it just highlighted some leaks along the copper pipping up to the boiler inlet valve. Perhaps if try and sort the leaks I could give that another try.

Shaun

br31/05/2021 16:43:29
697 forum posts
3 photos
Posted by Clive Brown 1 on 31/05/2021 15:16:28:

Your linked connector isn't suitable. 5/16" JIC is 24 threads per inch. I don't know the RR boiler design, but I'm certain that it won't have any 24tpi threads in th bushes if its to ME standards.

 

Quite right Clive not 24 as you say but 26tpi as I have already posted to say . Guess you missed it so copied and pasted below.

--------------------------------------------

Paul is spot on with thread pitch

Safety valve bush is 5/16 by 26 tpi which should do you ok

bill

 

Even offered to get my son to turn him up one but no response from OP.

 

Edited By br on 31/05/2021 16:46:08

Redsetter31/05/2021 17:42:22
192 forum posts
3 photos
Posted by Shaun Johnston on 31/05/2021 16:33:14:

I did think that connector was a long shot, In regards to the side tank pump, I had considered that and tried it briefly but if anything it just highlighted some leaks along the copper pipping up to the boiler inlet valve. Perhaps if try and sort the leaks I could give that another try.

Shaun

You will need a properly working hand pump for your steam test, so best to get that sorted first.

noel shelley31/05/2021 19:31:09
870 forum posts
19 photos

Hi Shaun, I would strongly recommend that the FIRST thing you do is join your local club ! The rothenberger prufpump is capable of raising in excess of 500PSI and could do irreparable damage to your boiler if not used with great care ! The rothenberger gauge is quite small. For more accurate readings I would consider T ing in a 4" 0-300psi Gauge, a good one ! If I understand correctly you are new to the hobby ? Take your time, your locomotive is a precision machine and could so easily be damaged by lack of understanding - hence joining a club where there will be many who will advise and help you to avoid pitfalls. Check the thread of your boiler ! BSP 1/2" is no problem but 5/16 X26 I do not have, 32 tpi I do have and can make up an adaptor for you. Good luck, Noel.

br31/05/2021 19:42:05
697 forum posts
3 photos

Hello Noel

Already offered services of my son on adapter - no response.

I will withdraw my offer and leave it to you.

biill

JasonB31/05/2021 20:04:27
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Moderator
21650 forum posts
2495 photos
1 articles

Br does does not look like you have sent him any PM's so unlikely to get a reply.

br31/05/2021 20:50:16
697 forum posts
3 photos

Jason

Did not send PM as you say it was an offer made in my third post down.

Third post down - last line

Can always ask my boy to make you one if it helps..

bill

Shaun Johnston01/06/2021 12:58:04
5 forum posts

Thanks again everyone for your input, much appreciated. Yes I am new to model engineering but not to steam locomotives, I have a reasonable amount of footplate experience but have spent very little time in a workshop!
Trying to get my head around all the different sizes for fittings has been the most straining part so far.
Bill I’m sorry I hadn’t replied to you previously, I’d be more than grateful if you were able to have an adaptor made, I thought I’d see if there were any other options first to save you the trouble!

Regards

Shaun

br01/06/2021 14:47:23
697 forum posts
3 photos

Shaun

Two good postd worth taking on board

Noel - comments on joining club and pump pressure

Redsetter - comment on getting your pump working.

A club will have a boiler tester and invariably the adaptors

If you want to have a go yourself, remove one of the two safety valves - strip it down and use the casing for your adaptor

bill

Shaun Johnston01/06/2021 18:23:22
5 forum posts

I think considering everything my course of action will be to get the tank hand pump fittings free of leaks, from there I can hopefully use that as a pump for the hydraulic test and continue from there and in the mean time I will contact my club nearby and see about getting along there.
With this being the case could someone be as kind as to tell me what size copper pipe I should use and the fitting sizes for the front boiler inlets?

thanks again

Shaun

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