Spark & Leak Testing


offering meaningful results

Process Fabrications Ltd. can provide site spark testing to GRP, Rubber and plastic tanks and pipes.

Process Fabrications Ltd. can provide high and low voltage spark testing on painted; glass lined or coated pipes and vessels to detect damages of interior coating applications on surfaces. A test voltage is applied to the coating by moving a brush probe across the surface and where there is either a pinhole or flaw, the voltage will spark through the coating at the flawed location, a red flashing indicator will flash and an audible alarm will sound. The detected flaw can now be marked for subsequent repair and testing resumed for the remaining surface area. If no flaws are detected the test will therefore be non-destructive.

The value of the test voltage is determined by the dielectric or voltage strength of the coating thickness. As a rough guide the test voltage can be approximated between 3 to 5 volts per micron of coating thickness, therefore 1000 micron would be approx 3kV to 5kV test voltage.

The purpose of the test is to determine the presence of pinhole leaks, punctures, cuts, etc., that expose passages to the base metal. Please note that a spark test is not complete without a full and thorough visual inspection of the entire lining completed at the same time as the spark test itself. Spark testing is not an absolute test, meaning that it is not 100% fail safe. Technique, visual inspection, equipment maintenance and rubber lining application experience are all essential in reducing errors, misinterpreting results and completing the spark test with meaningful result.

Contact Process Fabrications Ltd. to discuss your Spark testing, Hardness Testing Needs and Requirements.

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Audited & Accredited

Process Fabrications Ltd. are driven to ensure a better performing supply chain, hence we have achieved vendor compliance with Achilles, Achilles UVBD and Browz, eliminating risk for our clients, whilst comitting to ongoing supplier assurance.


Process Fabrications Ltd. offer of comprehensive range of products covering a diverse range of applications from piping systems to storage tanks to complex tailor-made process equipment. We deliver innovative composite and plastic materials and services by putting effort into research and development of our products and performance.


Process Fabrications Ltd. provide worldwide industries with corrosion resistant solutions for storage and processing with curved composite products and related services. Industries specialising in include Chemical Processing, Metal Finishing Plants, Waste Water Treatment Processing and most recently Water to Energy Technologies.

Support Services

Process Fabrications Ltd. have a proven track record in being able offer the complete Support, Service, Maintenance and Repair solutions required across our extensive range of products and services. With over 50 year of experience we can guarantee our clients total peace of mind, ensuring smooth day to day operations.

Specialists in Corrosion Protection

Contact Us

Units C, D and E
John Harper Street
West Midlands
WV13 1RE

t: +44 (0)1922 418005


Process Plant Solutions

Process Fabrications Ltd. are specialists in the fabrication of tanks for the process and chemical industries and acknowledged leaders in the field. Process Fabrications Ltd. offer a specialist service in corrosion protection including tank linings, coverings and insulation. All these come in a variety of materials such as rubber, PVC, glass fibre, glass flake, lead and special epoxy.