General Test Procedure (Draft 7)

  1. A gasket is loaded in a Hot Blow Out Test Rig, which is comprised of NPS 3 Class 150 or Class 300 raised face flanges. Using a torque wrench and best installation practices, the specified compressive stress is applied to the gasket.
  2. A waiting period for gasket creep and relaxation of 30 minutes is observed before the gasket is reloaded to the specified gasket stress.
  3. Another 30 minutes waiting period is observed before the rig is pressurized with helium gas.
  4. For HOBT without thermal cycles, once the pressure is applied, the temperature is increased up to 648.9°C (1200°F) maximum at a 16.1°C (3°F) per minute rate until blow-out or maximum temperature of the rig is reached.
  5. For HOBT with thermal cycles, once the pressure is applied, the temperature is increased at 16.1°C (3°F) per minute rate. The fixture is then cooled to room temperature. This cycle is repeated two more times for a total of three thermal cycles per test.

The procedure consists of three tests:

Test 1: HOBT without thermal cycles.
Test 2: HOBT with 3 thermal cycles using temperature estimation from Test 1.
Test 3: HOBT with 3 thermal cycles using temperature estimation from Test 2.

Test Results for GORE GR Sheet Gasketing

  Gasket Thickness Blowout Temperature Blowout Stress Blowout Pressure Trial Gasket Temperature Tgs
HOBT with Cycling Draft 7
  • NPS 3 Class 150 Slip-on Flange
  • 34.5 +/- 1.7 MPa
    (5000 +/- 250 psi)
  • 30bar (435 psig) Helium
 3.2mm
(1/8")		 392.2°C
(738°F)		 8.8MPa
(1271 psi)		 30bar
(435 psig)		 Actual: 339°C
(635°F)

Limited to: 315°C
(600°F)

Test Results for GORE Universal Pipe Gasket

  Gasket Thickness Blowout Temperature Blowout Stress Blowout Pressure Trial Gasket Temperature Tgs
HOBT with Cycling Draft 7
  • NPS 3 Class 150 Slip-on Flange
  • 34.5 +/- 1.7 MPa
    (5000 +/- 250 psi)
  • 30bar (435 psig) Helium
 3.2mm
(1/8")		 385°C
(725°F)		 7.0MPa
(1008 psi)		 30bar
(435 psig)		 Actual: Greater than 384°C
(723°F)

Limited to: 315°C
(600°F)

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