Dielectric tube fitting isolates field instruments
Dielectric tube fitting isolates field instruments
Keywords:Parker Hannifin, Tubing, Corrosion prevention
Parker Hannifin informs us that it has released a dielectric compression fitting for instrumentation tubing (Plate 3). It claims that this will provide low cost protection for any sensitive electronic measuring equipment connected to corrosion-protected industrial equipment such as pipelines and storage tanks. The new fitting incorporates a special interconnecting component made from PEEK that electrically isolates pressure, temperature or other fluid's instrumentation from the current flow employed in cathodic protection systems.
Plate 3Parker's new dielectric compression fitting for instrument tubing protects sensitive electronics connected to corrosion protected industrial equipment such as pipelines and storage tanks
According to Parker its new fitting has been designed to provide a universal solution for fluid instrumentation applications. These can be adapted for both metric and fractional tube sizes. These claim complete flexibility over the type of tube ends - allowing any combination of male/female pipe thread or tube connections using standard A-LOK or CPI compression fittings. Moreover, the fittings are optimised for high integrity applications and feature only two joints.
The Parker Dielectric Fitting range operates over a -40 to +200°C range and is rated for pressures of up to 4,000PSI (liquid) or 3,000PSI (gas). The fitting is provided with a highly visible electric blue identification ring to alert installation and maintenance staff.
A special size 6 (3/8inch) port connector is at the product's core. The PEEK ferrule is moulded around the machined end, forming a size 8 (1/2 inch)captured-nut tube-end connection. At the opposite end is a size 6 (3/8 inch) nut and ferrule(s). This may be specified with either the A-LOK double ferrule, or the CPI version single-ferrule compression sealing mechanism. The latter option reportedly halves the number of potential leak paths in the connection, boosting safety, reliability and integrity, and simplifying assembly and maintenance.
The insulating component has a dielectric resistivity of 10 x 109ohms at 500VDC.
Further details are available from Parker Hannifin. Tel: +44 (0) 1271 313131;Fax: +44 (0) 1271 373636; E-mail: ipd@parker.comor Tel: +97 1 2 788587; Fax: +97 1 2 793812.
