Confused about BSP threads

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Reply to
IMM
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Those will do for the male threaded connections on the cylinder's primary coil connections (for conenction to the boiler). Cylinders[1] have female threaded connections for the hot water draw off at the top of the cylinder and cold water feed to the bottom, so you will need a 1" BSP male parallel fitting for that. I use 1" BSP male X 22mm compression connectors (and female X compression rather than union fittings for the primary connections) and arrange that one can dismantle a few compression connectors to remove the cylinder (when/if that ever becomes necessary).

Union connectors such as IMM suggests are very good for making dismantlable joints because with the nut undone the pipework requires very little pulling back to allow the cylinder (or whatever is connected with it) to be removed. This is more important with steel pipework which has /appreciably/ less give than copper, and where one doesn't have compression joints which one can readily undo.

[1] at least, the handful I have fitted.
Reply to
John Stumbles

The cylinders I've come across invariably have male threads on the primary coil connections and female on the cold water in and hot water out conections. As for parallel or taper wherever they express a preference it's for parallel: quite a few I've seen have signs saying PARALLEL THREADS MUST NOT BE USED.

Reply to
John Stumbles

I would avoid these as they take time connect using old fashioned hemp. Best use dedicated cylinder connectors.

Reply to
IMM

Not all. You can specify what you want. 1" MBSP is best and then use cylinder connectors. Quicker, easier and more professional.

connections)

dismantlable

Reply to
IMM

Hi Nick. If you use Parallel threaded fittings the seal is made on the shoulder using fibre or copper washer or "O" ring or Dowty Bonded Seal or in some cases metal to metal. If you use Tapered threaded fittings the seal is made on the thread using PTFE tape or Hemp and Boss White or a Loctite Sealant. BS21 (British Standard for pipe fittings/threads) allows Tapered Male to be Screwed into Parallel Female. Tapered is sometimes useful because it will allow you to position the fitting, like a male stud elbow, if it was parallel it would be impossible to position an elbow. If I had a choice, I would use tapered all the time. Baz

Reply to
pjdesign

Many cylinders have FBSP parallel threads, with a braid flat flange at the end. This is so a parallel MBSP threaded fitting can be screwed in using a washer between fitting and the flange. I have never managed to get one to seal using this method, so abandoned it to wishful thinking on behalf of cylinder makers. Best have:

  1. MBSP parallel threads on all cylinder connections and use cylinder connectors.
  2. Built-in compression joints on the cylinders (The Telford Typhoon has this)
  3. The Albion Albi connectors. (a bit pricy but good).

Why cylinder makers still supply FBSP parallel connectors is beyond me. The connectors should be quick and easy.

Reply to
IMM

IMM. What is that all about, you have replied to my message with something that has nothing to do with my message and you also snipped my message without any acknowledgment. Read the OP. Baz

Reply to
pjdesign

Thanks, that seems to sum up the situation, I'll try tapered male thread with ptfe because I've got the bits already.

Nick Brooks

Reply to
Nick Brooks

Do I need your permission in triplicate to do this?

Reply to
IMM

Does the maker allow taper threads?

Reply to
IMM

In message , IMM writes

What are cylinder unions? We've changed lots of direct cylinders as we're builders who have to maintain a large number of letting properties whose cylinders were fitted in the 70's. Each time I order a replacement from Plumb's or BES we get a tank with 1" female We also get male 1" bsp parallel adaptor for 22mm compression.

We had lots of fun sealing these until we discovered Builder centres jet blue. We've fitted 20 odd and all we do is smear the stuff over the threads and all is well.

I still don't like the fitting though. The only time I've seen anything different is on the odd specialist stainless steel cylinder we've fitted for un vented systems. I know I can spec what I like but when you need a cylinder off the shelf in a hurry........

Reply to
mark

If you snip a message it is normal to indicate that you did. By not doing so, my message appears out of context. And your reply is out of context with my message. And it was not what the OP was asking. Baz

Reply to
pjdesign

... But then never get around to doing anything

Reply to
raden

Well calling me a cowboy is one thing (I'm not though I'm not a professional plumber) but then calling Grunff one in the following posting is quite another. GET A LIFE !!!!!!!

Reply to
G&M

Would you like to tell us all which cylinder maker specifically says taper threads can be used ?

Reply to
G&M

I am impressed with Loctite, but if the fitting moves you have a leak in many cases. They claim no. I have seen one leak this way with Loctite. A bit pricy for what it is.

Reply to
IMM

professional

Don't use cowboy ways and people will not refer to you as one. Simple.

Reply to
IMM

And your excuse is ???????

Reply to
G&M

I gave the BES part Nos of some.

Reply to
IMM

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