Lloyd Specialised Coatings helps sewer pits pass manhole vacuum testing

When two newly constructed sewer pits failed sewer manhole vacuum testing, they could not be commissioned until the issue was resolved. The failure was traced back to the concrete base, which was too porous to create the airtight seal required for testing.

Lloyd Specialised Coatings was engaged to prepare, seal and coat the pits so they could meet the required standard and move forward to commissioning.

The team began by thoroughly cleaning the sewer pits, removing contaminants and preparing the concrete surfaces for coating. This preparation stage was essential to ensure the coating system could properly bond to the substrate and perform under test conditions.

Once the pits were clean and ready, Lloyd applied one coat of Altra-Lock 576 to help seal the porous concrete base and strengthen the surface. This was followed by two topcoats of Carboguard 635, creating a durable protective barrier designed to improve airtightness and provide long-term protection within the harsh sewer environment.

The coating system successfully addressed the porosity issue, allowing the sewer pits to pass manhole vacuum testing and proceed to commissioning.

By combining careful surface preparation with the right protective coating system, Lloyd Specialised Coatings delivered a practical, efficient solution that helped the client avoid further delays and achieve compliance.