About Hot Tapping
Pipefreezing isn't always the best solution, and in these cases, APS is able to offer clients an Under Pressure Drilling, or 'Hot Tapping' service.
Under pressure drilling is employed as a means of providing a branch connection to a live pipe in constant operation, where the consequences of a shutdown would not be practicable. This method uses a short section of pipe, to which an isolating valve is either welded or fitted mechanically. After fitting - and with the valve in the open position - the pipe is drilled to the maximum permissible size through the valve. On completion of the drilling operation the valve is closed, and the drilling equipment removed.
A comprehensive range of optional fittings is available, including corporation cocks, ferrules, sample points and various type of valves.
This process can be completed without leakage or loss of flow and can be used on almost any type of pipe (iron, steel, plastic, concrete) carrying liquids at high temperatures and under pressure.
Download our brochure here: Under Pressure Drilling Brochure
Sequence A
A pre-fabricated 6" Under Pressure Drilling Tee being fitted to a 10" main at an industrial site, where the requirement was to extend the system.
Sequence B
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Sequence C
The under pressure drilling machine is removed and, to complete the job, a blank flange is fitted to ensure that no leakage can occur should the valve be accidentally (or intentionally) opened.
