4″ Hot Tapping & Line Plugging

As part of a live water network intervention, we carried out a DN100 PN16 line plugging operation, enabling safe work without interrupting service.

The operation began with the supply and installation of a full-encirclement tapping fitting and a full-bore valve. Once our teams and equipment were mobilized, a controlled under-pressure drilling was performed, preceded by a nitrogen tightness test.

In parallel, a mechanical saddle and a secondary 1″ valve were installed to allow for network purging. A second hot tap was carried out for this purpose.

The line plug was then inserted to isolate the targeted section, allowing downstream work to be conducted under optimal conditions. Continuous monitoring was ensured throughout the plugging phase. At the end of the intervention, the system was safely removed and all components dismantled with care.

This operation reflects our expertise in live network interventions, combining safety, precision, and technical control.

Two DN65 Hot Taps on DN100 Hot Water Header

As part of an intervention on a pressurized hot water network, our teams successfully carried out two DN65 hot taps on a DN100 header, without interrupting service.

Following insulation removal by the client and precise location marking, we installed two mechanical saddles on the cleaned and prepared header.

Each tapping point was fitted with a DN65 PN16 full-bore valve. Our technicians then mounted the drilling machine, followed by a nitrogen tightness test to ensure the system’s integrity.
The under-pressure drilling (Ø 60 mm) was performed with precision, and the coupons were returned to the client.

This operation was completed with the highest level of rigor and in compliance with safety standards, ensuring uninterrupted operation of the network and providing a reliable solution for future tie-ins.

Six piquages en charge DN25 sur collecteur vapeur DN700

Dans le cadre d’une intervention sur un collecteur de vapeur de grand diamètre, nos équipes ont procédé à la réalisation de six piquages en charge DN25 sur une conduite DN700, en conditions de service. Les piquages, équipés de vannes à passage intégral et de manchons filetés 1″ NPT, ont été préalablement fournis et soudés par le client.

Nos techniciens ont ensuite pris en charge les opérations de forage sous pression. Chaque perçage, réalisé avec précision (Ø 19 mm), a été précédé d’un test d’étanchéité à l’azote afin d’assurer la fiabilité du montage. L’ensemble des opérations a été répété sur les six points de piquage, avec mobilisation maîtrisée de notre machine de forage.

Cette intervention illustre notre capacité à intervenir sur des installations sensibles en environnement vapeur, à haute température, tout en garantissant la continuité de fonctionnement du réseau et le respect des normes de sécurité les plus strictes.

DN350 Hot Tap on DN500 Potable Water Header

Our teams carried out a DN350 PN10 hot tap on a DN500 potable water header, with no service interruption.

Following the installation by the client of a welded DN350 flange connection and a full-bore valve, we proceeded with the hot tapping operations under pressure.

The tapping machine was mounted onto the valve and subjected to a nitrogen tightness test to ensure full safety before drilling. The cut, with a diameter of 324 mm, was performed with precision, and the coupon was returned to the client at the end of the intervention.

In the case of rolled or spiral-welded headers, an internal reinforcement is systematically installed to prevent any equipment blockage and ensure safe execution.

This operation highlights our expertise in large-diameter live tapping, combining technical precision, safety, and compliance with sanitary standards for potable water networks.

Execution of 10 Hot Taps on an Ammonia Water Network

As part of a large-scale technical operation, our teams carried out 10 hot taps on an ammonia water network, on headers ranging from DN200 to DN500.
The entire operation was conducted in a demanding environment—under pressure and at controlled temperature—with a high level of precision and safety.

We provided all fittings, including calculation notes, NDT inspections, gaskets, and bolting, in full compliance with the client’s technical specifications.

Hot taps were distributed as follows:

• 2 DN200 taps on a DN200 header
• 2 DN300 taps on a DN300 header
• 2 DN300 taps on a DN400 header
• 4 DN350 taps on a DN500 header

Each tap was preceded by a nitrogen tightness test to ensure system integrity. Our hot tapping machines were then mounted on full-bore valves to perform pressure drilling in a fully controlled manner.

This operation involved access constraints, heavy handling, and a sensitive environment (ammonia water at 68–75°C under 4 to 6.5 bar), and highlights our ability to efficiently operate on complex industrial installations, while meeting the highest technical and safety standards.