UK: +44 (0)78 17365880NL: +31 (0)78 6172461DE: +49 (0) 2335 91094-00BE: +32 (0)3 541 74 99PT: +351 265 424 309PL: +48 (0)66 9009078
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HSOS Industrial Services
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On-site industrial services

Choose your industry

Pick your area — we show you what matters for your industry.

All areasHSOS overview
IndustryOil & Gas, Chemicals
IndustrySteel processing
IndustryPipeline Construction
IndustryPower plants
IndustryVessel Construction
IndustryInfrastructure
IndustryMining & raw materials
IndustryShipyards & Marine
IndustryWind Power
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2007
Founded
6
Countries
100+
Turnarounds
24/7
On call
11 Specialised services

HSOS bundles all turnaround activities into one strong team – fewer interfaces, less downtime.

Flange Facing
1
Flange Facing

Flange Facing

Portable flange facers from 12.5 to 12,000 mm – ID-mounted or OD-mounted directly on site.

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On-Site CNC Machining
2
On-Site Machining

On-Site CNC Machining

Face milling, drilling, contour milling, laser alignment and 3D measurement directly at and inside your plant.

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Line Boring
3
Line Boring

Line Boring

Precise machining of cylindrical bores in cranes, engine blocks and heavy machinery on site.

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Pipe Cutting
4
Pipe Cutting

Pipe Cutting

Split-frame and Trav-L-Cutter machines for pipes from 50 to 3,000 mm in diameter.

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Bolting
5
Bolting

Bolting

Hydraulic torque wrenches and bolt-tensioning for critical flange connections with ±10% accuracy.

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Composite Repair
6
Composite Repair

Composite Repair

Composite repairs in accordance with ISO 24817 – service life of 20+ years, without taking the system out of service.

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Pipe Freezing
7
Pipe Freezing

Pipe Freezing

Temporary ice plug with liquid nitrogen or CO₂ – repairs without shutting down the installation.

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Hot Tap & Line Stop
8
Hot Tap & Line Stop

Hot Tap & Line Stop

Tapping under operation up to 24″, 100 bar and 300°C. No interruption to the media flow.

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Leak Sealing
9
Leak Sealing

Leak Sealing

24/7 emergency service. Sealing of active leaks under operation in accordance with ASME VIII Div. 1 and RToD.

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Heat Treatment
10
Heat Treatment

Heat Treatment

Preheating, PWHT, induction, normalising and tank-coating curing – rental included.

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Sales, Rental & Training
11
Rental & Training

Sales, Rental & Training

Specialised machinery available by the day or week. WFPr training in accordance with VCA-SOG guidelines.

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TAR – Turnaround Services

Europe’s largest
TAR equipment fleet

HSOS bundles all major TAR activities into one strong team of specialists. With experience from more than 100 turnarounds – ready for action even at short notice.

Turnaround Services
▸
Bolt-Tensioning
▸
Heat Treatment
▸
On-Site Machining
▸
Composite Repair
Certifications
✓
ISO 9001:2015
✓
ISO 45001:2018
✓
VCA-P 2017/6.0
✓
AD 2000 HP 7/1
✓
WHG AwSV
More about us
TAR project at petrochemical plant Rotterdam
TurnaroundMay 12, 2026

TAR project at petrochemical plant Rotterdam

HSOS team carried out bolt-tensioning, heat treatment and flange facing in parallel within one turnaround – downtime reduced by 30%.

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ISO 45001:2018 & VCA-P successfully recertified
CertificationApril 28, 2026

ISO 45001:2018 & VCA-P successfully recertified

All certifications successfully renewed by BSI – valid until 2028. HSOS confirms the highest occupational-safety standards in the process industry.

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New heat-treatment equipment fleet at the Wetter site
LocationApril 15, 2026

New heat-treatment equipment fleet at the Wetter site

The rental fleet has been extended with new induction units and mobile furnaces. 36-channel heat-treatment systems for large projects are now available as well.

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Always available – fast on site

Less downtime, less production loss. Contact us – 24/7.