Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I’m sorry for all the spelling errors. I was on my iPhone which is even harder to see. I didn’t do a good job proof redness. I got interrupted by Amazon. I got more steam stuff. 

Anyway I’m progressing on yhe massive boiler build. A simple project has become very big and much more complicated than planned.  Now it’s threads.  I had planned on using all not  US THREADS BUT MANY  gage snd extras are ME threads. So what say yes. Should I stay with /8” NPT and add occasional 1/4” NPT OR SHOULD I JUST GO WITH ME threads. Turns out there are. Bunch of these too.then finding adaptors or making them is an iddue.  can I just tap drill ME say /4 x 40ME tap drill size and either tap it or drill it out to 1/8”. NPT and tap it.  ?  Can I drill out a 1/8” NPT  pipe plug to 1/4 x40 ME thread or do I have to come up with captors I am going to make a tap slighter so they will be straight.    How about thread sealers can I just use Teflon tape or do I need to get pipe dope. ?  I’d like to use small diameter gages if possible to keep the clutter down.
 I can get AN fittings in aluminum or stainless steel. I’d like to use a braided Teflon supply line. AN 3 I losing favor as brake line but is readily available . it takes a social tool to expand the tube and open up the braid but I can live with that. I’d prefer not to use direct hard lines but I can. My son uss stainless steel tube so it would look nice  but it is difficult to handl and leads to unwanted bend that are hard to straighten. It possible to use a crimped hoe too. There is a big hydraulic store not too far away. I’m pretty sure his hose is high temp rated.I can get red blue or black AN fittings or stainless.  Stainless is not cheap but more durable.

Byron