Old steel pipe thread size

[ma701ss]

Hi, I tried to fit a new basin yesterday, the taps are connected to old steel pipe in my 30's house. The thread on the steel t-piece is slightly larger than 22mm, more like 23mm or perhaps of imperial it's supposed to be 7/8 inch. I need a coupler from this thread to 15mm but can't find any. Does anybody know where I could get one? I'm not a plumber and just wanted to do the bare minimum as temporary solution.

 

[antdad]

Sounds like it's probably 5/8 bsp, a decent plumbers merchants should be able to help.

https://en.wikipedia.org/wiki/British_Standard_Pipe

 

[ma701ss]

Hi, thanks I think you're right. I understand it now having looked at bspt.co.uk. I'm trying to connect up to old steel and lead pipework. Think it may be time to renew but in the words of my good friend Mick Hucknall, money's too tight to mention. I have lead mains going into loft and then back down to the kitchen. From the tank in the loft to the bathroom there is also lead cold pipework. I found online a 50m coil of speedfit plastic pipework for £40. Just wondered if I could use this and find a larger size for the water main, and then run all of it in one length without any joints (except where needed to branch off)? Might be easy for me to do then.

 

[ShaunCorbs]

Have you tried a 3/4 fitting ?

 

[ma701ss]

No didn't try that, I don't have one. It measures 23mm so assuming it must be 5/8 bsp.

 

[ShaunCorbs]

No didn't try that, I don't have one. It measures 23mm so assuming it must be 5/8 bsp.

prob 3/4 as they didnt use funny sizes

 

[plumben]

You should really replace all the lead and steel pipe work, that lead will be 85 years old and well past its time, any slight movement or stress could cause it to leak, not to mention it breaking down into the water your drinking

 

[ma701ss]

prob 3/4 as they didnt use funny sizes

But 3/4" is 26.441mm (to be precise!). I measured across the thread and the internal diameter is 23mm.

 

[ma701ss]

You should really replace all the lead and steel pipe work, that lead will be 85 years old and well past its time, any slight movement or stress could cause it to leak, not to mention it breaking down into the water your drinking

If it's also lead in the ground outside the house though, probably not much point changing it for health and safety reasons?

 

[ShaunCorbs]

But 3/4" is 26.441mm (to be precise!). I measured across the thread and the internal diameter is 23mm.

should say on an iron fitting but 80% it should be 3/4

 

[gmartine]

Take the T - piece off and go to your local merchants.