By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Recycling Fire extinguisher pressure gauges

All Topics | Latest Posts

Search for:  in Thread Title in  
Chris Gunn27/09/2020 12:50:55
337 forum posts
24 photos

Has anyone tried recycling the nice 20mm diameter fire extinguisher pressure gauges for use on Models? I have some that are about 20mm diameter with a face marked in red green then red sectors.

It seems that a new face could be added once the gauge had been calibrated.

Chris Gunn

Circlip27/09/2020 12:53:57
1197 forum posts

Trust you have a calibration quality test gauge OR lots of weights and attendant fittings.

Regards Ian.

John Rutzen27/09/2020 13:13:47
264 forum posts
12 photos

I made one, it was necessary to replace the diaphragm that is in there with a lighter gauge one because the range was too high for model loco use. However I ended up buying one for the loco because I didn't know what the boiler inspectors would say. There is nothing in the boiler code however that says you can't make your own pressure gauge.

Martin Kyte27/09/2020 15:31:36
avatar
2059 forum posts
37 photos

Are gauges not just indicators and have nothing to do with boiler safety at least on models. No idea what the boiler test procedure is but I would have thought it would involve setting the safety valves to some external full size calibrated guage.

regards Martin

Chris Gunn27/09/2020 20:09:05
337 forum posts
24 photos

Ian, I do hold the club boiler testing gear, including a calibrated gauge,.

John, I did not realise the gauge on the extinguisher was was a much higher range, I should have realised the contents will be at a higher pressure then say 100PSI to be effective. I guess that is why they use coloured sectors rather than indicate the true pressure. Also the construction of the body would point to a higher pressure than is useful to us.

Martin the boiler test includes checking the pressure gauge against the calibrated test gauge.


Chris Gunn

Robert Atkinson 228/09/2020 10:29:22
avatar
770 forum posts
17 photos

These gauges are NOT suitable as they are not direct pressure gauges.They are contents gauges.

If you look closely at one with the pionter axis in the center of the dial you will see the pointer is attached to a coil of flat material. This is a bi-metallic temperature compensator. Thus the gauge indication stays the same as the pressure in the extinguisher rises and falls with changes in ambient temperature. This is obviously not a good thing for a boiler!

Robert G8RPI.

Circlip28/09/2020 12:04:52
1197 forum posts

Have a picture of the workings Chris? Gauge out of F/E body.

Regards Ian.

Chris Gunn28/09/2020 22:09:21
337 forum posts
24 photos

Robert thanks for that, and Ian, I have not taken one apart yet.

I sought advice from the forum before I did anything, and as usual the members came up trumps, and saved me wasting time on this. I have 6 old extinguishers, still viable if the gauges are to be believed, and saw how to turn them into table lamps on Find it, Fix it Flog it the other day, and this led me to think about re-purposing the gauges as well.

Thanks to all

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
ChesterUK
EngineDIY
emcomachinetools
Warco
cowells
Eccentric July 5 2018
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest