Tapping out NPT to BSP

[InMyHO]

Colleagues

Has anyone ever tapped out a brass tapered NPT thread to get it to take a male non-tapered BSP threaded insert? For use with mains pressure water. I guess you use the sort of tap that can cut a thread in a blind hole. Does it work?

Thanks in advance for your answers.

 

[Onetap]

Colleagues

Has anyone ever tapped out a brass NTP thread to get it to take a male BSP threaded insert? Does it work?

Thanks in advance for your answers.

NPT?
No reason why it wouldn't work, unless you goof up the drilling and tapping. I've used Swage-lok adaptors; converts $?!! to £?!!!!!.

 

[InMyHO]

Thanks Onetap.

I used to deal with a piece of kit made by NTP so the TLA confuses the heck out of me. Sorry.

I do not know anything about Swage-lok. Do they make a converter from NPT to BSP or are you talking about something more involved than that?

 

[InMyHO]

It might help if I say that I want to go from 15mm copper tubing into an NPT fitting. I am looking for a better way than just using lots of PTFE tape on a BSP thread. It probably works but I will not be around to baby sit the connections and I want to be more sure than probably.

 

[Onetap]

It might help if I say that I want to go from 15mm copper tubing into an NPT fitting. I am looking for a better way than just using lots of PTFE tape on a BSP thread. It probably works but I will not be around to baby sit the connections and I want to be more sure than probably.

I did a search; I still have a couple of heat exchangers with NPT threads that I want to re-use. This lot make adaptors;
http://www.malcleanse.co.uk/BSP-to-NPT-Thread

I used to deal with US made equipment occasionally and Swage-lok had a comprehensive stock of fittings and were always able to supply what I needed, usually NPT to BSP adaptors. Lovely fittings, but they weren't cheap. I wasn't paying and the convenience justified the costs.

Don't try and force a BSP fitting on, the pitch is different and will strip the threads. I wouldn't try drilling and tapping the equipment, due to the risk of getting swarf in it and voiding any guarantees.

 

[InMyHO]

Thanks again. Those adapters look like they would do the job - and with a lot less risk. Much appreciated.