How does bspp seal

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I've got quite a few BSP fittings in my system. Getting my head around these isn't straight forward. Hence this topic just to have a sanity check with Nickfromwales et all, and for others new to this confusion. Even so it is still not simple as on any fitting there is an inner male and outer female part and BSPP fittings do not have a consistent approach to whether the seal is at the female end or the male one.

Taps have the seal at the end of the male end and the female is also male in that it has an inner guide that slots inside the male. Fittings like my Hep2O manifolds have the seal at the female end and in fact the male end doesn't even have a decent face to put an O ring against it you wanted to. Fittings like my PHE and TMV have the seal at the end of the male end, but the inside diameter won't accept a tap connector, so I need a female fitting with a flat plate inner face and matching washer.

Tap washers will fit but the seem unnecessarily narrow. So any words of wisdom on this mess? One last comment here is that I came across a recommendation to use liquid PTFE if you want a good seal. Is this a good idea? A revelation on threaded fittings.

Lubes and seals. No more squeaky brass compressions or weeps. Think Nickfromwales favourite is "Gasseal". The Jet Blue is labelled specifically for potable water, is why I went for that instead. BSPT Fittings and Adapters With a tapered thread, the fitting generally seals via metal-to-metal wedging of the threads. However, the seal is made with an O-ring or bonded washer.

These fittings provide the best seal when assembled with a lubricant or sealant to form a pressure-tight joint. Both BSP thread styles are found in hydraulic applications from the oil and gas industry to heavy equipment and industrial machinery. Keep up to date with the latest from the Brennan Blog by subscribing to blog notifications below. Every month we will send you a brief digest of the latest posts with a link where you can read more. Thread sealant is needed to seal but only 2 turns of thread sealant is required.

Any more than that and the seal can leak around the thread sealant. The angle across the flanks of threads if you sliced the fitting in half long-ways and measured the angle from root to crest to root is 55 degrees instead of 60 degrees as it is for NPT.