Glass lined equipment is manufactured in-house to exacting international quality standards including ISO 9001:2015, DIN EN ISO 28-721 and ASME VIII.

We conduct rigorous inspection regimes throughout the manufacturing process, starting with receiving the raw material and ensuring full material traceability throughout the manufacturing process.


SGL has developed a skilled fabrication workforce certified to the latest ISO and ASME standards who are capable of manufacturing and fabricating products to tight tolerances and international welding specifications using precision CNC robotic welding. Our coded welders create the base fabrication which is then expertly finished to ensure no surface imperfections. After fabrication and machining, all welds are subjected to Non-Destructive Testing (NDT) in accordance with the latest ASME and international pressure vessel standards, to ensure joint integrity.

Heat Treatment

After fabrication, the product is then normalised and shot-blasted to ensure all the surfaces are clean and have the optimum surface finish for mechanical adherence of the glass coating.

Once the glass coating is applied, SGL’s automated CNC furnace affects fusion between glass particles (typically above 800 deg C) to cure the coating evenly to precise quality standards. SGL has in-house computer controlled heat treatment furnaces capable of reaching temperatures of 1000 deg C.


SGL conduct 100% inspection on all manufactured vessels and pressure containing equipment.

Our inspection process is fully detailed in our ISO 9001:2015 Quality Management System and adhered too at all times given the service criticality of the products we make.

We also welcome client inspection hold points during the manufacturing process, where, at pre-agreed times, client quality engineers can inspect the partly-manufactured products. This is typically required where inspection can not be undertaken when the product is in its final stages (i.e. reviewing the surface finish inside a welded/sealed vessel could be a requested inspection hold point).

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