Test Methods

Impact Resistance

The Impact Resistance Test is conducted to determine the resistance of a material to impact damage by establishing the amount of energy necessary to cause failure of a coating.

Physical or mechanical damage to a pipeline coating may occur during shipping, installation or service in the field which will allow the environment to permeate to the metal substrate and initiate corrosive degradation. This test provides a systematic means for screening coating materials by examining the energy required to rupture the coating applied to a pipe under specified condition of impact from a falling weight. The coating examination is done visually for signs of failure such as cracking or flaking, or instrumentally with a holiday detector. The higher the amount of energy required to cause cracks or penetration of the coating film, the higher the impact resistance and durability of the coating.

Sample Requirements:

1” x 8” x ¼” (25 mm × 200 × 6 mm) one-side coated flat panels
4” x 4” x ¼” (100 mm × 100 × 6 mm) one-side coated flat panels
1” x 8” x pipe wall thickness (25 mm × 200 mm × pipe wall thickness) specimens from test rings with the 8” (200 mm) dimension parallel to the axis of the pipe
10" length x 4" ID (250 mm x 100 mm ID) coated pipe rings

Test Methods:

CSA Z245.20 Section 12.12
ASTM D2794
ISO 21809-1 Annex E
ISO 21809-2 Annex A.14
ISO 21809-3 Annex D
NACE SP0394 Appendix I
API 5L9 Appendix J
API 5L7 Appendix 14

Test Capabilities:

Test temperatures typically range from:
-40 °C (-40 °F) to 80 °C (176 °F)

Impact energy is adjusted according to the requirements
Impast Test Setup
Charter Coating’s Impact Test setup

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