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
Successful intervention at petrochemical plant in Rotterdam
ProjectMay 12, 2026

Successful intervention at petrochemical plant in Rotterdam

Our team successfully carried out an emergency repair on a high-pressure pipeline at a petrochemical plant in Rotterdam. Thanks to our rapid response and…

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ISO 45001:2018 recertification successfully completed
CertificationApril 28, 2026

ISO 45001:2018 recertification successfully completed

We are pleased to announce the successful recertification to ISO 45001:2018. This certification confirms our continuous commitment to occupational safety and…

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HSOS Industrial Services – turnarounds from a single source
TurnaroundSeptember 4, 2020

HSOS Industrial Services – turnarounds from a single source

With our TAR programme HSOS bundles all turnaround-relevant services into one team: bolt-tensioning, heat treatment, on-site machining, hot tapping, leak…

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Always available – fast on site

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