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| Non hardening sealant to 400psi |
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| David Jupp:
Hmm - though some of my experience is to much higher pressures than you are using (and with flammable gases), I would never expect a parallel thread to seal against pressure. Tapered/Parallel combinations, though designed to seal (with compound or tape) are enough of a 'bodge'. If it works for you then fine, but I'd keep a careful eye on it and always be a little suspicious... |
| picclock:
@ DavidJupp OK, you've convinced me. I've just changed it for a male 1/2" to 1/4" tapered thread fitting. With this new sealant its a snap as its pressure tight straight away so no curing times. Best Regards picclock |
| Lew_Merrick_PE:
--- Quote from: David Jupp on April 29, 2013, 01:53:19 PM ---Hmm - though some of my experience is to much higher pressures than you are using (and with flammable gases), I would never expect a parallel thread to seal against pressure. Tapered/Parallel combinations, though designed to seal (with compound or tape) are enough of a 'bodge'. --- End quote --- O-ring seal (JIC type or MIL-SPEC type) provide much better sealing. Silicone o-rings of the proper compound can work up to nearly 600°F. At that or higher temperatures, a crush-type copper face seal works quite well. Tapered threads with any flurocarbon seals tend to die once the pressure gets much above 15,000 psi. |
| awemawson:
I used some allegedly 'non hardening' sealing compound to seal the joint between the head casing of my J&S 540 surface grinder and the Optidress wheel forming attachment. It had to seal yet be easy to remove. You guessed it - several months later when I came to remove it it was stuck utterly solid. I rang the makers help desk and their only solution was to heat it to 150 deg C - remember this is precision equipment - I wasn't best pleased! Sadly I cannot remember the make. |
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