Brass fitting, help needed to identifi the thread type

[Dyersy]

hello everyone, i hope someone can help me out.
i,m trying to reuse an old wrap around boiler and i have run into a snag.

to cut a long story short, there is 4 X 22mm brass fittings on the boiler so i bought a 22mm straight brass coupling to test. fits as it should on one fitting on the boiler (hot water return) but the other fittings on the boiler appear to be the same size but have a different thread and wont screw on . can anybody give me advice on this. thanks

 

[ShaunCorbs]

Any chance of a few pics of the boiler ?

 

[Dyersy]

Any chance of a few pics of the boiler ?

Shaun, thanks for getting back to me. i don't know if these pics will help.

 

[Darren Jackson]

You need a female 3/4" -22mm compression joint for that 2nd picture & the one you have already in picture 1 is a male 3/4"-22mm compression.

 

[Best]

Hard to say from those photos. The threads on the old fitting look to me to be normal threads, not fine like on old Kuterlite.
Why not just remove the old fittings and renew with whatever new fittings you need - straight male or bent male fittings?
Usually the male tappings on boiler will be 1" thread, so you will normally need 1"x 22mm or for gravity pipes 1" x 28mm fittings.
Good luck with using a second hand back boiler! I wouldn't trust them

 

[Best]

You need a female 3/4" -22mm compression joint for that 2nd picture & the one you have already in picture 1 is a male 3/4"-22mm compression.

Are you sure it is 3/4" tapping on boiler? Normally 1" as it has to be on a solid fuel boiler that heats rads etc. Have to be 28mm gravity pipework, so has to be 1" tapping

 

[Darren Jackson]

Are you sure it is 3/4" tapping on boiler? Normally 1" as it has to be on a solid fuel boiler that heats rads etc. Have to be 28mm gravity pipework, so has to be 1" tapping

Quite right Best, hard to tell on the pictures it will probably be 1" on the boiler tappings, I just thought that in picture 1 the tapping has what looks like 1" bush in it reducing it to 3/4 and the elbow in picture 2 has a 1" male reducing to 3/4" male but without being there to measure you're right cant be 100% sure.

 

[Darren Jackson]

Are you sure it is 3/4" tapping on boiler? Normally 1" as it has to be on a solid fuel boiler that heats rads etc. Have to be 28mm gravity pipework, so has to be 1" tapping

Quite right Best, hard to tell on the pictures it will probably be 1" on the boiler tappings, I just thought that in picture 1 the tapping has what looks like 1" bush in it reducing it to 3/4 and the elbow in picture 2 has a 1" male reducing to 3/4" male but without being there to measure you're right cant be 100% sure.

 

[Robert Tyrrell]

Good luck with using a second hand back boiler! I wouldn't trust them

Same here. don't forget to fit an ABV and pressure PRV as well, if it's a pumped system

Are you OFTEC (other competency schemes are available) trained? If not, who's going to commission it and get your BC notice?

 

[Robert Tyrrell]

Good luck with using a second hand back boiler! I wouldn't trust them

Same here. don't forget to fit an ABV and pressure PRV as well, if it's a pumped system

Are you OFTEC (other competency schemes are available) trained? If not, who's going to commission it and get your BC notice?