About Us
MOSS’ specialist on‑site Machining, Repair, and Mechanical services are backed by over 25 years of industry experience. Based in the UK, the business delivers safe, reliable, and responsive support across the oil & gas, marine, defence, power generation, utilities, nuclear, and industrial sectors — working extensively with UK major shipyards while supporting onshore, offshore and international facilities.
Our expert services support critical operations including on‑site machining, leak sealing, controlled bolting, mechanical maintenance, shutdown support, engineered composite repair, and emergency engineering response.
MOSS’ on‑site machining capability covers flange facing, pipe cutting, milling, line boring, drilling, tapping, and honing. Advanced milling operations include linear milling, gantry milling, and in‑situ machining with CNC‑controlled optionality — enabling precision machining to exact tolerances directly at the asset location. Line boring capability restores and machines mating bores for shafts, bushes, and bearings to precise fits and tolerances, ensuring correct alignment, smooth operation, and extended equipment life. These capabilities support critical repairs, efficient material removal, and fine finishing without the need for component removal, significantly reducing downtime and improving operational efficiency.
Leak‑sealing services provide rapid, safe containment of leaks on pressurised systems, including steam, water, oil, gas, and chemical lines, using engineered mechanical clamps, injectable sealants, and live‑sealing techniques to restore integrity without shutdown. Engineered composite repair solutions deliver long‑term structural reinforcement, corrosion restoration, and pressure‑containing repairs for degraded piping, vessels, and equipment.
MOSS’ shutdown and turnaround services provide fully managed support for planned outages, major maintenance events, and critical path activities. On‑site teams are experienced in complex multi‑discipline shutdown execution, including equipment removal and reinstatement, machining scopes, bolting and joint integrity work in accordance with ASME PCC‑1, and the reinstatement of critical flange connections. With a focus on safety, schedule control, and minimising downtime, shutdowns are completed efficiently to return assets to service with restored integrity and reliable performance.
As part of the Denholm Energy Services group, MOSS combines deep technical expertise with industry‑leading safety standards and a commitment to excellence, helping customers maintain efficiency, reliability, and continuity across their most demanding environments.
