How do you prove the seams are sound?

Dual wedge seams are air channel pressure tested along their full length, so the entire seam is verified rather than sampled. Extrusion welds at details are spark or vacuum box tested. A seam log recording every weld, welder, machine and test result is issued at handover.

What thickness of liner do you install?

The common range for containment is 1.0 mm to 2.0 mm HDPE, selected against the service, the subgrade and the design life. We will advise against the application rather than quote a default.

Can you repair an existing lagoon liner?

Yes. Locating the defect is usually the larger part of the job; the repair itself is extrusion welded and tested like any other detail.

Geomembrane & HDPE Liner Installation Bahrain

A containment liner either holds or it does not, and the failure is almost always at a seam or a detail — a penetration, a corner, a termination at the crest. Sheet is the easy part.

Welding and testing

Dual wedge welding

The primary seaming method. Two parallel weld tracks with an air channel between them, which allows the complete seam to be pressure tested along its full length rather than sampled. If the channel holds pressure, the seam is continuous.

Extrusion welding

For patches, penetrations, corners and details that a wedge welder cannot run. Tested by spark testing or vacuum box, depending on the detail.

Scope

Subgrade acceptance and anchor trench preparation
Deployment, panel layout and seaming
Pipe and structure penetrations with boots and collars
Destructive and non-destructive seam testing with records
Anchor trench backfill and crest termination
Repair of existing liner systems

Records: a seam log identifying every weld, its welder, its machine, its test method and its result is issued at handover. Panel layout drawings are marked up as built.

Standards we work to

GRI GM13
GRI GM19
ASTM D6392
ASTM D5820
ASTM D4437
DVS 2225

Geomembrane installation