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The primary application of this test is for determination of relative resistance to gouging damage for pipe coatings that are intended to protect the steel during pulls through directional drilled holes or other physically demanding operations. It may be applied to primary corrosion coatings, such as FBE, multi-layer FBE, extruded polyolefins, liquid epoxies and coal tar enamel, as well as weld-area coatings like liquid epoxies, shrink sleeves, and tapes. The apparatus consists of a movable cart under a fixed point. The point can be loaded with weights to any desired level up to about 100 kilograms. Typically, the contact point for this test is a replaceable carbide burr with a 20-degree angle cone point terminating in a hemispherical tip. The specimen is placed on the cart and the cart is pulled at a rate of 25 centimeters per minute (10 inches per minute) under the loaded point. This apparatus uses an electric motor and a screw driver mechanism to move the cart.

Test Capabilities:

  • Test conditions may be varied of different temperature and different weight typically between 25 and 100 kg
  • The contact point travels at a speed of 25.4 cm/min

Sample Requirements:

  • Laboratory-coated flat plate specimens shall measure approximately 76 × 102 mm (or be sized to suit the test apparatus)
  • Pipe coupon specimens shall be of the same dimensions as the laboratory-coated samples
  • Specimens from test rings shall be sized to suit the test apparatus, the maximum diameter of the specimen is 4.5” OD

Test Method:

  • CSA Z245.20 Section 12.15
  • CSA Z245.21 Section 12.7
  • NACE STG 35/TG 04
Charter Coating’s Gouge Tester and setup showing pipe ring platform