Double steel plugs
In addition to the ranges of Nylon and Aluminium plugs and Inflatable Stoppers, the HFT Pipestoppers® Division of Huntingdon Fusion Techniques HFT®, also manufactures a range of Double Steel plugs for pressure testing and stopping all pipe work from 50mm (2") upwards.
A double seal can be even more effective for more arduous duties such as long immersion in water and use at higher temperatures or for contact with acidic or alkaline environments for which the Nylon and Aluminium plugs might be unsuitable. The test pressure capability of the single stoppers is limited and the double versions increase that capability, while offering a greater stability in the pipe. As single plugs approach their pressure limits, they can tend to tip over like a butterfly valve. The double plugs will prevent the tipping and guarantee the seal.
The Double Steel Plugs are manufactured with 1/2", 1" & 2" outlets.
1/2" outlet for plugs up to 6" ,
1" outlet for diameters 8" to 18" and
2" outlet for 20" and greater diameters.
As with the other steel, nylon and aluminium plugs the natural rubber seals
can be exchanged for Silicon, Viton, Nitrile or other chemically and
temperature resistant rubbers.
All plugs conform to British Standards BS8005 for low pressure testing and sealing of pipes.
Double length plugs give greater stability in pipes and holes. The double length prevents them from tipping or "butterflying" and losing their seals.
The double length seal give greater protection against the leakage of hazardous fluids or gasses.
Some extra resistance against higher pressures is given, however like all plugs, they should be braced for safety purposes when gas pressure testing is employed.