Hot Tapping

Hot tapping is a method of employing an under pressure drilling machine to cut a hole in an operating pipeline or storage vessel
which allows for a new branch connection from the existing pipe or vessel without any interruption to the flow.

Hot tapping is also the first procedure in line stopping, where a hole saw is used to make an opening the pipe,
so a line plugging head can be inserted.


We are capable of providing hot tapping service for Tapping of various pipe material including carbon,
galvanished and stainless steel, ductile and cast iron and metal pipe with concrete lining.

  • Pipeline up to 48" (1200mm) diameter
  • Operating pressure up to 2,000 psig
  • Operating temperature up to 300°C
  • Various pipe including oil, gas, water, steam or wastewater.


We provide pipe freezing service with the following advantages :

  • One-Stop Service - Hot Tap accessories & service, insulation & piping works
  • Convenient - No need for massive draining of fluid
  • Hassle Free - Installation of valves, pressure & vacuum gauge, thermowell
  • Reliable - Many years of hot tapping experience
Hot Tapping Procedure
Hot Tapping Process

The components required for a typical hot tapping operation include a hot tap fitting designed to contain system pressure,
a valve used to control the new connection and a hot tapping machine. The basic operation procedure is as follows:

  • Install hot tap fitting and valve on existing pipeline.
  • Install hot tapping machine.
  • Perform hot tap through open valve and “coupon” is retrieved.
  • Retract cutting assembly.
  • Close hot tapping valve.
  • Remove hot tap machine to allow for connection to new pipe.
Thermowell / Flowmeter Installation

Thermowells are recommended for temperature instruments in process systems where pressure, velocity, or viscous, abrasive, and corrosive materials are present individually or in combination.
A properly selected thermowell will protect the temperature instrument from damage resulting from these process variables.
Additionally a thermowell enables removal of the temperature instrument for replacement, repair or testing without affecting the process system.

Alstern Technologies specializes in the design and manufacture of all types of thermowells and we have the following thermowells available.

  • Material available in Brass, Carbon Steel, Chrome Steel, Stainless Steel, Inconel®, Incoloy®, Monel® and Hastelloy®.
  • Available in threaded, straight, tapered and limited space version.
  • Available with threaded or flanged end-connections.

Recent Photo Reference