Pipe Intervention, AOGV & Calibration
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AOGV - increasing plant up time

The AOGV – Add On Gate Valve, is a field proven patented technology which inserts an isolation spade on a live flanged connection thereby reducing down time and eliminating the need for extensive isolation activities.


Isolation activities and process segregation in plants is necessary to create a safe barrier for intrusive maintenance:
• Drainage  (down time, large volumes)
• Venting (down time, HSE)
• Purging (down time, cost of inert Gas)
• Flushing (down time, high volume treatment)
• Recommissioning and start up

Following completion of the isolation operation the AOGV is removed and the flange couple is recommissioned to its original state.
The AOGV enables safe isolation and segregation of the process system and reduces the volume for cleaning, thereby saving volume of cleaning fluids used, time and cost.
Oil platforms and refineries and chemical processing plants are characterised by long lengths of connecting pipework and vessels containing large volumes. The contents are often hazardous substances, which may be flammable or toxic and are often at high temperatures or pressures. Any intrusive activity could allow the escape of hazardous substances. The implementation of adequate isolation practices is critical to avoiding loss of containment.
The AOGV™ is a proprietary technology which can be installed at strategic locations and significantly reduces the need for drainage, venting purging and flushing by segregating the process system and increasing plant up time.


We offer calibration of electronic and mechanical tools and instruments in our laboratory. We have a short turnaround time and providenecessary sertificates. The calibration may also be performed on site.


Pipe Intervention

We perform corrective maintenance on live process systems and facilitate the replacement of valves and repair of piping and flanges. It starts with a study through which we enable the client to make qualified decisions regarding feasibility of repair methods. Our aim is to perform essential maintenance during live operations.


The goal of Pipe Intervention is that fields, installations and facilities in a late-life phase are operated safely.

A large and growing part of the Norwegian petroleum industry is characterized by marginal profits as a result of reduced production, reduced oil price and increased costs. Efficient on-line repair of aging infrastructure supports maximising uptime.

Valves are aging on installations long out-living their initial design life. Lifetime extension is a demanding and rewarding exercise. Our techniques are useful in keeping the installation up-to-date and safe. Different methods of hot plugging or line stopping are used in particular for replacing leaking valves in difficult to  access positions.

These can be valves facing hydrostatic pressure from the sea, or valves being a part of extensive systems which are hard to isolate and access, even during a shut down. Hot pipe intervention operations are becoming more frequent. Plant uptime may increase as IK have the equipment and expertise to carry out the operation, which requires working on a pressurised system, with the appropriate attention to safety.

The operation will undergo risk assessment. Building trust with the team, including the operators of the plant is a vital part of risk management.

As part of the preparation full scale function testing plays an important role in safety management. The team of hot tapping operators, client project personnel as well as the plant operators become familiar with the operations. A mutual understanding of the different aspects of the operation is demonstrated so the team can support each other through the field operation.

IK Pipe Intervention provides safe,  engineered services for on-line repair and modifications of Hot and Cold  systems. Our solutions secure high plant up-time, and we engineer Intervention on live process systems.

Clamps for sealing leaking pipes or reinforcing piping with reduced pipe wall specially designed and fabricated clamps.

Valve isolation methods of direct valve intervention. Repair valves without shutting down the system.

The equipment is designed for pressure  according to PED / EN 13445 and the hot tapping according to API RP2210.

Freeze plugging a system is a non-intrusive method for pipe intervention on live systems. The method is available for seawater and freshwater systems in all available piping materials.

The freeze plugging is a well proven method for system isolation and is performed with qualified methods and procedures. IK has in its portfolio all the recognised methods for freezing. The plugs are normally frozen close to the minimum design temperature of the pipe.

We use liquid nitrogen or CO2 to generate the low temperatures. All the methods can be controlled temperature wise and the freeze plugs can be held over time. The freezing process is controlled during the work. Liquids other than water can be frozen for line stopping and the system liquid can be replaced in special cases. The method can be designed to suit a range of cases.

A correctly set freeze plug serves its purpose and leaves no traces.

Hot tapping and line stopping techniques can be used for the tie-in of a new system to an existing system or for maintenance and repair operations. Bolted clamps such as the hot tapping clamp are  accepted. Line stopping includes pipe  freezing, stoppling and elbow plugging.

The tie-in of a new process system to a live system during operation is becoming more common. All aspects of risk needs to be analysed and managed during the operation. There are typically two areas which have to be addressed as part of the preparation:

1. How is the new line to be fitted to the existing pipe? Selection of the welded or bolted joint method is a balance between welding on a live system and the long term effect of having a bolted joint in the system. IK can provide either option with both solutions in service as selected by our clients.

2. Performing the hot tap operation. The generic risks associated with hot tapping are addressed in the engineering and planning stages of the operation. The equipment, its use and testing as well as operational factors of the process plant all play an important part in the safe and successful accomplishment of the tie-in of a new system.

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Kenneth O. Rosén

Department Manager Pipe Intervention & Calibration
M: +47 992 79 828
T: +47 51 44 67 00

Kjetil Aamodt

Principal Engineer
M: +47 948 06 755
T: +47 51 44 32 19

Roald Kolnes

Project Manager Pipe Intervention IK-Norway
M: +47 922 64 887
T: +47 51 44 32 20

Tore Svalestad

Section Manager
M: +47 92 26 42 42
Fax: Torque and Calibration