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SSP, a manufacturer of leak-free instrumentation fittings, tubes and valves for the offshore oil and gas industry, has released a free white paper on Offshore Technology on Duolok instrumentation tube fittings.
With a specialised technical centre built within SSP, the Duolok tube fittings have undergone:
- Hydrostatic proof and burst pressure testing
- Air and/or helium pressure testing
- High vacuum testing
- Cyclic vibration testing
- Tensile pull testing
- Hydraulic impulse testing
- Thermal cycle testing
- Low temperature (cryogenic) testing
- High temperature testing
These tests determined, amongst other criteria, if the tube fitting assembly has adequate pressure-retaining capability, based on the ANSI / ASME B 31.3 maximum allowable working pressure of the tubing; if the tube and fitting assembly has comparable levels of assembly torque to that of Swagelok and Parker; if the tube fitting assembly has adequate pressure-retaining capability, based on the ANSI / ASME B 31.3 maximum allowable working pressure of the tubing; if the tube fitting assembly has high resistance to vibration-based fatigue when simultaneously exposed to 1.6 times tubing maximum allowable working pressure; and if all combinations of tube fitting components (nut, back ferrule, front ferrule and fitting body) of Duolok and Swagelokcan be intermixed in a tube fitting assembly, resulting in both adequate gas and liquid pressure-retaining capability.
In every case all Duolok test results met or exceeded the established design team’s acceptance criteria for these products.
To download this free white paper please click here.
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