Isolation Joints

For long-term dependability, experts choose the ALFA Monolithic Isolation Joint which is welded into place for a permanent solution.

•  Industry proven double O-ring seals standard (available with triple O-ring seals based on application)

• Standard O-ring material ‘NBR’ (other materials optional based on application)

•  O-ring design in accordance with ASTM D2240, ASTM D412, ASTM D395, ASTM D1329, ASTM D1817 and ASME VIII Div.1 appendix II.

•  Isolating elements:  NEMA G10/G11 – ASTM D709 Class H

•  Back seal: silicone neutral low module/filler isolator: epoxy resin cold cured 

•  Internal and external coating of amine cure epoxy resin

•  Pipe pups API 5L X52 or API 5L Grade B (other materials available as per customer requirements)

•  Welding in accordance with ASME IX

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The Barlow Flange Isolation Joint is welded into place for a permanent solution and designed to the highest possible standards using precision machined heavy duty components.

FEATURES:

•  Thicker dielectric sleeves (1/8″) machined to precise, close tolerance dimensions, both length and diameter

•  Flange bolt holes line reamed to provide perfect alignment and close tolerance fit to the dielectric sleeves

•  Flange studs machined from Alloy Steel and heat treated to ASTM Designation A-193-52T Grade B-7 resulting in superior strength and greater resistance to stress-induced elongation

•  Coupling nuts machined from Alloy Steel and heat treated to ASTM Designation A-194 Class 2-H

•  Precision machined steel washers, flat, parallel and counterbored allowing for square alignment and clearance for the dielectric sleeves

•  Flange gasket precision cut for ideal fit with small projection into the stream to prevent bridging of the joint inside the pipe

•  Precise assembly with accurate torquing carried out in sequential pattern followed by retorquing after 24 hours

•  Flange gap sealed with epoxy resin to prevent contamination and electrical shorting

•  Dielectric strength test (minimum) 5 kV at 50 hz for 1 minute (dry air)

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The IMAC Barlow TMK Surge Arrestor has non-linear voltage current characteristics and limits potentially destructive voltage levels without interfering with cathodic protection. Nominal values are 50 ohms at 250 volts – 30,000 ohms at 3 volts.  It is self-healing and able to survive multiple strikes with your choice of wire size connections.  Designed for above or below ground installation with fiber-glass housings available for above ground installation.

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