At ONS 2008 the instrumentation products division of Parker Hannifin, the global leader in motion and control technologies, is highlighting a ground-breaking range of high-pressure tube fittings.
The novel Phastite connector can reduce assembly times for permanent connections by 20 fold or more compared with welding or cone-and-thread tube fittings, and eliminate any need for hot work permits. Moreover the fittings are designed to withstand working pressures up to 1,379 bar (20,000 PSI), providing a highly cost-effective solution for the demanding higher pressure hydraulic and instrumentation applications that are increasingly being faced in the offshore oil and gas sector.
Many applications can be found on the topsides of today's platforms, as well as on support vessels and subsea equipment and ROVs. These include hydraulic systems for wellhead control, emergency shut down, chemical injection, pumping packages, gas booster systems, and test equipment.
Phastite tube fittings can also deliver substantial material cost and weight savings as the connections do not need to be used with more expensive tubing with extra thickness to accommodate a thread -- as is the case with cone and thread fittings. Additionally, Phastite is inherently resistant to vibration and does not require any anti-vibration accessories.
New additions to the Phastite range mean that Parker now has a comprehensive portfolio of fluid connector sizes and shapes, and assembly tools, for metric or imperial tube or pipe applications up to one inch/25 mm.
Phastite's sealing mechanism is based on a series of defined internal ridges that create a secure seal, by radial compression, without weakening the tubing surface. The ridges effectively grip in a way that retains all of the tubing's strength.
These profiles also make the fitting particularly suitable for vibration prone environments. In testing to verify conformance with BS 4368 for example (which calls for 20 million vibration cycles at between 23 and 47 Hz - some 238 hours of testing in total), Phastite fittings were left on the rig until destruction. The fittings still retained their seal even in excess of 400 hours, and at this point, the test frequency was increased way beyond the range of the standard, and the fittings continued to operate for another 40 hours.
Tolerance of vibration (as well as shocks) is a critical area of performance in ROV applications for example. The maintenance free nature of a Phastite connection is an additional highly valued characteristic for this area and other subsea applications.
Phastite’s multiple profiles provide excellent sealing without any detrimental effect on the tubing. This means that thinner wall tubing can be used on gas service lines. Compared with cone and thread fittings which require thicker wall tubing sizes (because of the thread cutting), the savings in both weight and cost can be very significant. An offshore platform or FPSO might have 250,000 feet of tubing for example, and a large percentage of that might be used for gas service depending on the type of platform.
The Phastite system is already being exploited in numerous offshore applications, from new builds to repairs and refurbishment. Two recent application examples include lowering the costs of connections on a gas compression skid, and simplifying changes to heavy-wall one-inch pipe hydraulic services. The latter application was on a working production platform in the North Sea, with Phastite eliminating the need for a hot work permit and associated costly downtime.
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