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Flange Isolation Kits, by GPT

Flange Isolation Kits, by GPT
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GPT Flange Isolation Kits

GPT Flange isolation kits are available for all flange sizes, types, pressure ratings and materials. Each kit is individually and securely packed in a reinforced corrugated cardboard box, which is clearly labeled as to its contents for convenience in warehousing and field use. Very large diameter gaskets are packaged separately from the sleeves and washers for convenience in storing and handling.
Each gasket is labeled with:

  • Materials (Retainer Material or Retainer / Seal Element Combination)
  • Pipe Size
  • ANSI Class
  • Date of Manufacture
  • Type Flange (Weld Neck or Slip-on)

Sleeves and washers are enclosed in a strong polyethylene bag to eliminate any possibility of loss. A chart showing the recommended sequence for tightening flange bolts is also included with each kit, as well as with each individual gasket.

Common LineBacker® & GasketSeal® Sealing Gasket Physical Properties
 
ASTM
Test
Property Plain
Phenolic
Neo-faced
Phenolic
Hi-temp
Phenolic
G-3
Silicone
Glass
G-7*
Epoxy
Glass
G-10
Epoxy
Glass
G-11
D149

Dielectric strengths,
Volts/mil

500 500 550 350-400 550 550
D695

Compressive strength,
psi

25,000 25,000 50,000 40,000 50,000 50,000+
D229

Water absorption, %

1.6 1.6 0.7 0.07 0.10 0.10
D257

Insulating Resistance,
Meg Ohms

40,000 40,000 46,000 2,500 200,000 200,000
D790

Flexural strength, psi

22,500 22,500 60,000 27,000 60,000 75,000+
D785

Hardness Rockwell "M"

85 85 115 105 115 115
D256

IZOD Impact,
Strength ft-lbs/inch

1.2 1.2 12.0 8.0 14.0 12.0
D732

Shear strength, psi

10,000 10,000 18,000 20,000 22,000 22,000
D229

Operating temp, ºF

-65 to
+220
-65 to
+175
-65 to
+392
Cryogenic
to +450
Cryogenic
to +280
Cryogenic
to +350

Operating temp, ºC

-54 to
+104
-54 to
+79
-54 to
+200
-Cryogenic
to +232
Cryogenic
to +138
Cryogenic
to +177
* = G-7 material should not be used with hydrocarbons, not even trace amounts.

 

Seal Element Temperature Limits

Nitrile Viton Teflon Neoprene EPDM
-65 to +250°F -20 to +350°F Cryogenic to +450°F -40 to +175°F -65 to +300°F
-54 to +121°C -29 to +177°C Cryogenic to +232°C -40 to +79°C -54 to +149°C

Consider both retainer and seal element temperature limits together
for GasketSeal® and LineBacker® Sealing Gaskets.