Laminar Pte Ltd Singapore

Laminar Pte Ltd


Hot Tap Service

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Hot Tap Service scaled e1710949408813


Hot tapping is the technique to make a branch connection to a pipeline without interrupting or shutting down the operating pipeline, using an under-pressure drilling machine to create a hole in the pipeline.

Pressure tapping, line tapping, and wet tapping are used interchangeably with hot tapping.

It is an effective method for making fabrication works, maintenance, and connections to pipelines while remaining operational. As such, it is a cost-effective method that saves time and the environment, as no media draining or emptying will occur.

Laminar’s hot tapping machines for gas lines can be used in operating temperature ranges from -40 °C to 70 °C, with pressure up to 10040 bar and sizes from DN10 to DN2200500. with pressure rating up to PN40 for water and up to 100bar for petrol and petrochemical pipelines. Pipeline materials can vary from PE pipes to DI & stainless steel, etc.

Our Hot Tapping Machine weighs less than 30 kg, and one man can operate it.

We offer a range of tapping machines equipped with a hydraulic drive unit as a standard. Other possible drive types are hand drive, pneumatic drive, or electric drive.

It can be completed by a wide range of hole saws, pilot drills, and adapters to fit it with all pipeline materials. Our hot tapping machine allows pipeline alteration works into pressurised natural gas pipelines without shutdowns.

Industrial applications for hot tapping machines include:

  • Water transmission pipeline & distribution networks
  • Gas and Oil transmission pipeline & distribution networks
  • District Cooling or heating networks
  • HVAC
  • Process Industry

Hot Tapping Pipeline Services by Laminar

Besides the supply & delivery of hot-tapping machines, Laminar offers high-quality hot tapping services.
Laminar’s hot tapping method allows maintenance and modification of piping systems to be done on-line under operational pressure without stopping the network or interrupting service.

Job Analysis :

The hot tap process for a water distribution or gas or HVAC pipeline begins with the evaluation of the needed connection. The information that the customer needs to provide us are the following:

  • Size and material of the main pipe?
  • Size and material of the branch pipe?
  • Wall thickness of the main?
  • Fluid material?
  • Design pressure and design temperature?
  • Operational pressure and temperature?
  • Hot tap size and pressure Class?
  • Vertical or horizontal hot tap?
  • On ground level, underground (confined space) or at height?
  • Is split-tee fitting allowed or need welding 3-way fitting?
  • Is Service Continuity Essential?
  • Is the use of electric tools allowed in the worksite or we have to go for hydraulic pack and hydraulic actuator?
  • Accessories needed: Split-tee, branch saddle, plug, basket, gasket, blind flange, stud bolt, nuts, etc

 After Laminar engineer receive the basic information, we can provide you with the budget quote for the hot tap process. We will always make recommendations on the components (valves & fittings), but we can also operate with components provided by the client.

Hot Tap Operations :

The hot tap process and requirement differ depending on the industry or the media in the line. So the requirements and fittings to hot tap a gas pipeline are different from those for HVAC or water service lines.

Laminar hot tap process is designed so that we can use standard shut-off valves (e.g. gate valve or ball valve) for the hot tap connection. Consequently, client does not need to spend a lot of time and cost on special hot tap components. Usually, in a low and medium pressure networks a normal mechanical hot tap saddle or split-tee + shut-off valve combination is sufficient solution. It provides the complete project more flexibility and convenience. Laminar is capable of making the hot tap connection to all the pipeline materials used in the potable and waste sector, gas, HVAC and petrochemical. The most common methods of hot tapping:

  • Steel pipes: welding a split-tee + shut-off gate or ball valve
  • PE pipes: electrofusion hot tap saddle + Shut-off valve (Gate or ball valve).
  • Other pipe materials: Mechanical Hot tap clamp + Shut-off valve (Gate or ball valve)

Key Features :

Key features of Laminar hot tapping service:

  • No need for service interruption
  • No water is lost/No gas released into the atmosphere.
  • No need to wait until the line is completely empty – Reduces the filling time substantially
  • Avoids costly redesign of pipeline sections and reduces the cost of long planning
  • Removes the necessity to notify of water shortages
  • Flexible service process when using standard valves and fittings.
  • Co-operation – Sharing of different working stages (welding works)
  • Turnkey planning and execution, if needed.

LAMINAR Hot Tapping Capabilities :

  • Sizes from DN10 (3/8″) to DN2200 (88″)
  • Operating Pressures from vacuum – 4300 psi
  • Operating Temperatures from 0° C to 700° C
  • Virtually any pipe material
  • Both ASME and DIN Standards apply

To familiarize yourself with different hot tapping options, please read our articles about the hot tap and line stop service. You can also consult us directly.



Work Can Be Done Under Pressure: Hot tapping allows the work to be done under pressure without any need to shut down the pipeline.

Cost-Effective: Hot tapping is a cost-effective method as there is no need for draining or emptying the media.

Saves Time: As mentioned above, hot tapping saves time by not requiring a pipeline shutdown or an interruption of service. It means less downtime and less disruption for customers in the industry.

Environmentally Friendly: Hot tapping is an environmentally friendly technique because no materials are discharged into the environment during its execution, thus reducing environmental impact.

Before starting the hot tapping process, the operator must determine the existing pipe wall and ensure all the safety measures are taken with all appropriate equipment in place.

The first step is to mount and secure the hot-tapping machine on the pipe. After this, it is necessary to drill the hole in the pipeline using a hole saw or a pilot drill. The exact size of the hole will depend on the application and type of tap.

Once finished drilling, it is time to install a valve onto the hot tapping machine, which provides isolation between both sections of the pipeline, allowing for pressure testing and safe, continued operation.

Finally, it is time to attach a branch connection onto either side of the valve. It can be done using a flange, a clamp, or a welded connection.

When all connections are completed, the control valve should be closed with a disengaged clutch. The pipeline can be tested for pressure and any leaks detected. Once there are no more leaks, the whole process is finished!

While hot tapping is an excellent method for connecting and modifying pipelines, it has some limitations.

The fluids in the pipeline must not contain particles that can cause clogging or blockages in the valve or machine. Additionally, hot tapping is only suitable for steel or plastic pipes and may not be suitable for other materials.

Piping containing acids, chlorides, peroxides, or other chemicals that can become hazardous due to welding heat should be handled cautiously. Examples of such substances include sulfuric acid and acetylene.

The main parts of a hot tapping machine include:

  • Hole saws or pilot drills
    • These are used to cut the hole into the pipeline. It is vital to use the correct size and type for the application.
  • Adapters
    • These adapt the hot tap machine to fit different pipeline materials.
  • Control or Block Valves
    • These isolate both pipeline sections, allowing pressure testing and safe, continued operation. Ball valves and gate valves are suitable for hot tapping.
  • Branch connection
    • This can be attached to either side of the valve using a flange, a clamp, or a welded connection.

The ASME PCC-2 recommends a minimum velocity of 0.5m/s for liquid lines and 0.4m/s for gas lines. Section 216-310 also suggests a minimum flow rate of 0.4m/s for both types of lines.

A hot tap machine’s minimum flow ensures safe and efficient operation. Hot tap machines must be operated with a specific minimum flow rate to provide sufficient pressure for the drilling process and to ensure that any debris created from the drilling process is safely removed from the pipeline.

It is important to note that certain conditions may require a higher minimum flow rate. For example, larger holes or more complex connections may require a higher flow rate.

Therefore, it is always advisable to consult the applicable safety regulations and manufacturer’s guidelines before beginning hot-tapping procedures.

The American Petroleum Institute (API) has set various standards for hot-tapping operations. These standards are focused on ensuring safety and efficiency.

API RP-2201 is the API’s standard for hot tapping machines and related equipment, such as taps, drill bits, hole saws, and adapters. It outlines requirements for materials of construction, design features, and other considerations when selecting and using these tools.

API RP-2240 is an important standard that guides safe practices for hot tapping operations. This includes pressure testing before beginning work, conducting a risk assessment before drilling, verifying material compatibility with the pipeline contents, setting up adequate workspace around the tap point and controlling process fluids during drilling.

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