HOKE Gyrolok® Dielectric Fittings

Features	Benefits
Thermoplastic insulators with:	Maximum safety and protection to critical monitoring station instrumentation
Metal components made of 316 stainless steel	Long component life in rugged environment
Appropriate orifice for fitting size (e.g. 0.422″ orifice in 1/2″ fitting)	Maximum flow capability provided by all sizes of HOKE Gyrolok® dielectric tube fittings
HOKE Gyrolok® tube fitting ends	The unique value and performance offered by HOKE Gyrolok®

The HOKE Gyrolok® dielectric tube fittings are for use in applications where electrical current flowing through a pipe or tube line must be interrupted to protect vital instrumentation and metering equipment

Technical Data

Body Contruction Material	316 Stainless Steel	Electrical Resistance of Insulators	7.0 x 10⁸ ohms @ 10 Volts DC @ 70° F and 50% relative humidity 1.0 x 10⁶ ohms @ 10 Volts DC @ 100° F and 90% relative humidity
Insulator	Molded thermoplastic	Electrical Resistance of Insulators
O-ring Material	90 Durometer Viton®	Pressure Rating	4000 psig @ 70° F (276 bar @ 21° C)
Back-up Washer	Virgin TFE	Temperature Rating	−40° F to +200° F (−40° C to +93° C)

Design

The dielectric tube fitting must perform three primary functions
1. Electrical insulation
2. Reliable fluid containment
3. Appropriate flow for line size

In the HOKE design, the insulation function is performed by thermoplastic insulators which provide performance unequalled by any similar product.

A Viton® o-ring and TFE back up ring provide the containment function within the fitting. Gyrolok®'s 2-ferrule system provides sealing with the impulse line tubing.

Appropriate flow for line size is achieved by providing the appropriate inside diameter for tubing size. See "E" dimensions in Dimensional Table.

WARNING: A "NO WRENCHING" label is placed on the hex of the nut in the insulation sections. Do not disconnect at this point. Instructions are provided with every HOKE dielectric fitting.

Application

Commonly used in the Natural Gas Transmission industry, the dielectric fitting will prevent current flow resulting from Impressed Current Cathodic Protection Systems, static electricity or even lightning strikes, from reaching sensitive monitoring station equipment.

Impressed Current Cathodic Protection Systems involve the application of a low voltage, low amperage direct current to a pipeline and eventual transfer of corrosive effects to a typically underground anode bed.

If the current flow is not interrupted before reaching the monitoring station critical equipment could be damaged or rendered inaccurate.

By installing HOKE's Gyrolok® dielectric tube fitting on impulse lines between the pipeline and the monitoring station, current flow is interrupted while full fluid flow is permitted.

Viton® is a registered trademark of of DuPont Dow Elastomers.

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