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