Nearly 25 years ago, a group of innovators reasoned that proven composite technology used in other applications was highly suitable for use on pipelines worldwide.

Initially, Clock Spring Company, Inc. used composites as a crack arrestor. Crack arrestors are typically used on very high pressure CO2 lines, enriched natural gas pipelines, and various other applications where the threat of long running cracks exist. It was soon apparent that there was a need for a permanent pipeline repair system. Clock Spring Company, Inc.’s development team went to work and created derivative products.

In 1987, the Gas Research Institute (GRI) assembled a distinguished team of pipeline professionals and research organizations to direct a comprehensive program to verify the effectiveness, durability, and performance characteristics of a repair that permanently restores the serviceability of the pipe.

The decade-long testing program, which assumed worst case conditions, included extensive burst testing, stress rupture tests, field validations, cathodic shielding testing, and cathodic disbondment test.  This complete, accurate, and verifiable technical evidence was submitted to the DOT, which changed their language in the year 2000 to recognize Clock Spring® as a permanent repair. The GRI program remains the most thorough and trusted composite testing program ever conducted.

The below videos show some of the original Crack Arrestor tests conducted by Clock Spring Company, Inc. inventor Norman Fawley.


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ClockSpring|NRI has offices around the world with our global headquarters in Houston, TX, USA.

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North America (USA)
621 Lockhaven Drive
Houston, TX 77073
P: +1-281-590-8491
F: +1-281-590-9528
Unit 11 Premier Park
Acheson Way
Trafford Park
Manchester, England
M17 1GA
P: +44 161 710 3485

3875 Fiscal Court, #100,
Riviera Beach, FL 33404
P: +1 561 683 6992
F: +1 561 683 8366

4A The Causeway
Cambridgeshire, England
PE29 2HA
P: +44 148 041 4703
F: +44 148 041 4705

800 Busse Road
Elk Grove Village, IL 60007
P: +1 847 364 3700
F: +1 847 364 8883

4 Points Commercial Centre
Craigshaw Road
Aberdeen, Scotland
AB12 3AP
P: +44 122 487 9966
Eastern Europe
M. Konopnickiej Street
No 2a
Bydgoszcz, Poland
P: +48 601 707 946
Middle East
Road 1548 Block 115,
Warehouse Bld 3527
Unit 20,
Hidd, Khalifa Port
Manama, Bahrain
P: +973 3464 9577
F: +973 1728 1359

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