Are There Compression fittings that leak at low pressure?
We use 2-ferrule compression fittings, made by Swagelok and by others, to sizes up to 3/4″, to close to the limits of the tubing. We use these successfully in all kinds of services, including hydrogen service at high pressures and relatively high temperatures. There is no problem using them at low pressures. They do not leak at low pressure.
Can a ferrule fitting leak under low pressure?
Has anyone noticed on low pressure < 100psi that ferrule fittings can leak over time, through tube creep or distortion, vibration, temperature cycling, time etc.? The gasses we are using are Hydrogen, Methane, Oxygen. I would be interested to hear of your opinions and perhaps we can settle the argument!
What causes a leak in A Swagelok fitting?
On a material like 316, with a low yield strength, it may deform under stress and reduce the force exerted by the ferrule on the tube – and thus leak? A higher pressure system may not have this problem…? RE: Swagelok Fittings – Low Pressure Applications – Leaks?
How does Swagelok measure high pressure tube fittings?
High-Pressure Fitting. ■The rating for high-pressure tube fittings and threaded connectors is determined with Swagelok hardened tubing at room temperature. ■The rating for high-pressure tube fittings and threaded connectors with annealed tubing is 30 000 psig (2067 bar) at room temperature.
We use 2-ferrule compression fittings, made by Swagelok and by others, to sizes up to 3/4″, to close to the limits of the tubing. We use these successfully in all kinds of services, including hydrogen service at high pressures and relatively high temperatures. There is no problem using them at low pressures. They do not leak at low pressure.
Has anyone noticed on low pressure < 100psi that ferrule fittings can leak over time, through tube creep or distortion, vibration, temperature cycling, time etc.? The gasses we are using are Hydrogen, Methane, Oxygen. I would be interested to hear of your opinions and perhaps we can settle the argument!
On a material like 316, with a low yield strength, it may deform under stress and reduce the force exerted by the ferrule on the tube – and thus leak? A higher pressure system may not have this problem…? RE: Swagelok Fittings – Low Pressure Applications – Leaks?
Are there any welding fittings that leak at low pressure?
There is no problem using them at low pressures. They do not leak at low pressure. We don’t use them for ultahigh vacuum or where the client gives a tight helium leak spec which is basically a code word for orbital welding and face seal fittings.