What's pukka for jointing fittings (compression and straight threads)
for heating oil? I heard that PTFE tape was not OK. My Purimachos
green stuff says it's OK for oil but I wonder if it'd be that
effective - I don't think it gets thick and sticky over time like the
white stuff.

Also: it's a gravity feed system and it'd be easier to arrange the
pipework with a rise & fall to accomodate the filter and a butterfly
valve, as below:

________
| |
| tank |
|________|--- ___________
| ___?_ | |
| | | | |
-------------------------- ---| appliance |
|___________|

Should I have an air bleed at a high point in the pipework? (the point
marked ?)
Or should I try not to have a fall at all (do-able, but awkward).

tia

Stan the Span

(Stanley Spanner) wrote in message . com...

Also: it's a gravity feed system and it'd be easier to arrange the
pipework with a rise & fall to accomodate the filter and a butterfly
valve, as below:

________
| |
| tank |
|________|--- ___________
| ___?_ | |
| | | | |
-------------------------- ---| appliance |
|___________|

Should I have an air bleed at a high point in the pipework? (the point
marked ?)
Or should I try not to have a fall at all (do-able, but awkward).

I believe that would be fine as youve drawn it. All that matters to
the oil is the relative heights of start and finish, and length of
pipe. Sharp bends would add more resistance to flow. As long as your
high point is below the top of the oil in the tank there is no
problem.


Regards, NT

N. Thornton wrote:

(Stanley Spanner) wrote in message . com...


Also: it's a gravity feed system and it'd be easier to arrange the
pipework with a rise & fall to accomodate the filter and a butterfly
valve, as below:

________
| |
| tank |
|________|--- ___________
| ___?_ | |
| | | | |
-------------------------- ---| appliance |
|___________|

Should I have an air bleed at a high point in the pipework? (the point
marked ?)
Or should I try not to have a fall at all (do-able, but awkward).


I believe that would be fine as youve drawn it. All that matters to
the oil is the relative heights of start and finish, and length of
pipe. Sharp bends would add more resistance to flow. As long as your
high point is below the top of the oil in the tank there is no
problem.



I used to think so, but it sadly proved not to be the case. I still do
not understand why, but with an arrangement very similar to the above, I
had to suck the bloody stuff through. Total drop of 1.45m over 50 meters
of pipe, and as far as I knew only down underground then up to the
fliter/boiler. All I can sday is that with air in it, it would not flow.




Regards, NT

Stanley Spanner wrote:

What's pukka for jointing fittings (compression and straight threads)
for heating oil? I heard that PTFE tape was not OK. My Purimachos
green stuff says it's OK for oil but I wonder if it'd be that
effective - I don't think it gets thick and sticky over time like the
white stuff.

Also: it's a gravity feed system and it'd be easier to arrange the
pipework with a rise & fall to accomodate the filter and a butterfly
valve, as below:

________
| |
| tank |
|________|--- ___________
| ___?_ | |
| | | | |
-------------------------- ---| appliance |
|___________|

Should I have an air bleed at a high point in the pipework? (the point
marked ?)
Or should I try not to have a fall at all (do-able, but awkward).

tia

Stan the Span


Compression, but beware that they are weak at the normal pipe diameter.
PTFE tape doesn't work well - use Red Loctite to seal. Try to avoid up
and under routing - you will just have to bleed it - don't put bleed
valves on, just steel yourself and suck the bloody pipe full and then
never ever let it run dry again

The Natural Philosopher wrote in message ...

Compression, but beware that they are weak at the normal pipe diameter.
PTFE tape doesn't work well - use Red Loctite to seal. Try to avoid up
and under routing - you will just have to bleed it - don't put bleed
valves on, just steel yourself and suck the bloody pipe full and then
never ever let it run dry again

Plstic bag loosely over end of pipe before sucking would make life
less unpleasant - but I can just imagine some incompetent person
breathing the bag up and choking. So I'd best say dont.

Regards, NT

N. Thornton wrote:

The Natural Philosopher wrote in message ...


Compression, but beware that they are weak at the normal pipe diameter.
PTFE tape doesn't work well - use Red Loctite to seal. Try to avoid up
and under routing - you will just have to bleed it - don't put bleed
valves on, just steel yourself and suck the bloody pipe full and then
never ever let it run dry again


Plstic bag loosely over end of pipe before sucking would make life
less unpleasant - but I can just imagine some incompetent person
breathing the bag up and choking. So I'd best say dont.


Well bugger me. Why didn't I think of that. I am sure there are some
used condoms as well around somewhere...



Regards, NT