Woodburner pipe connections

[oldbutnotdead]

Another (maybe silly) question here. Having to use elbows for feed and return out of the woodburner (yes it heats water as well) due to no space, original plan was 1" straight to 28mm street bend.
So, need to pack the threads on the woodburner- normally i'd use loads of ptfe and some boss white but i've had a sudden 'will ptfe cope with the heat' flap.
I've got some hemp but never used it so unsure how much/how to apply (yes i'll check on Youtube but if i can i'll stick with ptfe)
Ta

 

[muggles]

You shouldn't use tight elbows on a solid fuel appliance, they should be long radius bends

 

[oldbutnotdead]

I know, thats why i was going to use street elbows. Unfortunately i've only got 80mm behind the end of the threaded boss on the woodburner and the back of the chimney is only half brick so i'm very reluctant to try chasing into it.
To be fair the thing has done me 2 winters plumbed with 22mm elbows at the back, there is a. (pumped) loading valve going on the feed & return to the store so gravity feed doesn't have to be super-efficient, just needs to work.
Did you get a chance to look at that shoddy sketch i put up last week? https://www.diynot.com/diy/threads/any-intergas-experts-left-on-here.549498/#post-4689949

 

[muggles]

Standard street elbows aren't any less tight than normal elbows generally, but these are OK...

https://www.jtmplumbing.co.uk/search/long-radius-street

 

[oldbutnotdead]

Standard street elbows aren't any less tight than normal elbows generally, but these are OK...

https://www.jtmplumbing.co.uk/search/long-radius-street

Oh they look as if they'll do the job, ta. Will nip up there tomorrow .
Bonus is if they do fit in the gap i won't need to pack the threads but will still have to seal them. PTFE or hemp?

 

[muggles]

Loctite 55

 

[oldbutnotdead]

Well hurrah they fit the gap (just), boo time to acquire a 28mm spring & bender, need to jog f & r to get them through the wall to the store.

 

[Nige F]

28mm spring?

 

[oldbutnotdead]

Do you not use an internal spring when bending 28mm tube? Do for 15 & 22...
EDIT Apparently not

 

[muggles]

Must be built like a gorilla

 

[oldbutnotdead]

Must be built like a gorilla

I wish....always used springs with the pipe bender, don't like the nasty wrinkles. No option with the 28, nasty wrinkles boo.

 

[muggles]

I wish....always used springs with the pipe bender, don't like the nasty wrinkles. No option with the 28, nasty wrinkles boo.

Or a properly adjusted bender and no wrinkles

 

[oldbutnotdead]

Or a properly adjusted bender and no wrinkles

Mmm, funny should say that. My bender is a toy one from Toolstation, no adjustment required.
On my toy for 22mm the roller is 40mm from bottom of form, thinnest part of die is 18mm, no adjustment so this looks like a plan.
This hired one looks like a Record 35, i've set the end hook so tube is level in the form, i've set the roller so clearance from bottom of form to roller is 44 mm (thinnest point of die is 16mm, tube is 28mm). Is that anywhere near? (Had a good search on here and Youtube for setup clues, no joy. No guide marks on the side of the roller carriage, Jewson instruction sheet says put the right size form & die in and bend away. Ta

 

[Lower]

Another (maybe silly) question here. Having to use elbows for feed and return out of the woodburner (yes it heats water as well) due to no space, original plan was 1" straight to 28mm street bend.
So, need to pack the threads on the woodburner- normally i'd use loads of ptfe and some boss white but i've had a sudden 'will ptfe cope with the heat' flap.
I've got some hemp but never used it so unsure how much/how to apply (yes i'll check on Youtube but if i can i'll stick with ptfe)
Ta

Presumably, the pipe temperature will be limited to the water temperature which in turn you wouldn't expect to exceed 80 degrees C.

Would you hesitate in using PTFE tape on central heating pipework?

 

[oldbutnotdead]

Presumably, the pipe temperature will be limited to the water temperature which in turn you wouldn't expect to exceed 80 degrees C.

Would you hesitate in using PTFE tape on central heating pipework?

Yeah thats why i wasn't sure if it was a silly question, i'm not sure what sort of temperatures the metal of the waterjacket on a woodburner gets up to. All the rest of the connections will get ptfe/boss white where needed (the thermal store won't go above 95, if it does the overtemp valve will vent).