Question 1

What does "on-site service" mean in the process industry?

Accepted Answer

On-site service means our specialists and equipment come directly to your plant. Repairs, machining, heat treatment and tests are performed without disassembly – saving time, transport and significantly reducing downtime cost.

Question 2

What is the difference between bolt-tensioning and torque tightening?

Accepted Answer

Bolt-tensioning hydraulically pre-loads the bolt axially – without friction losses. Torque tightening turns the nut at a defined torque, with part of the energy lost to friction. For critical high-pressure flanges, tensioning delivers significantly higher accuracy (±5–10%).

Question 3

Which standards does HSOS comply with for heat treatment?

Accepted Answer

We work to AD 2000 HP 7/1 (TÜV-certified), ASME PCC-2 and EN 13445. PWHT protocols are fully documented and handed over per project specification.

Question 4

How fast can HSOS be on site for 24/7 emergencies?

Accepted Answer

Across Germany and the Benelux we typically reach your plant within 4–8 hours. Equipment mobilises in parallel. First call any time: +44 (0)78 17365880.

Question 5

What pipe diameters can you machine?

Accepted Answer

Our fleet covers 12.5 mm to 12,000 mm. Split-frame and Trav-L-cutter machines handle cutting and bevelling of pipes from 50 mm to 30,000 mm diameter.

Question 6

Is a composite repair approved as a permanent solution?

Accepted Answer

Yes – composite repairs to ISO 24817 and ASME PCC-2 are recognised as permanent, with documented service life of typically 20+ years when correctly designed and applied.

Composite Repair

Scope of work