TPT January 2016

Technology News

Freeze sealing for pipe repairs CONTRACTORS and maintenance personnel involved in repairing pipework in buildings and other constructions have long faced the problem of making repairs on tubes and pipes when they are full of fluid and may not be economically viable to drain. either side of a repair zone, isolating it, to allow work to be carried out without draining the whole system. Luke Keane, technical support at Huntingdon Fusion Techniques (HFT), said, “Accu-Freeze utilises liquid nitrogen (LN 2 ) in a controlled way to

It does not expand outside of this area and does not create enough pressure to affect the integrity of the pipe. The primary advantages of the patented Accu-Freeze system include the increased freezing capability of LN 2 and the ability to control the pipe wall temperature throughout the freeze process. The LN 2 injections are automated, which reduces the operator’s workload and reduces the amount of LN 2 that is consumed. Accu-Freeze can also be operated remotely, which makes it suitable for use inside ‘hot’ nuclear areas where personal exposure must be kept below certain limits. The Accu- Freeze technique is able to freeze large diameters and control the entire freeze process. Huntingdon Fusion Techniques – UK Fax: +44 1 554 836 837 Email: pipefreezing@huntingdonfusion.com Website: www.huntingdonfusion.com

The Accu-Freeze ® pipe freezing system is able to freeze a plug in fluid Accu-Freeze uses liquid nitrogen to freeze stationary liquids, to form an ice plug inside the tube

freeze stationary liquids in a selected section of pipe or tube. By controlling the surface temperature of the pipe or tube, Accu-Freeze can accurately and safely form an in-line ice plug, capable of withstanding 136 bar in diameters up to 12" (300mm).” To form an ice plug, the water or liquid inside the pipe or tube is brought to a static condition and a specially designed insulated jacket is placed around the section to be frozen, upstream from the repair zone. Once the plug is formed, maintenance and repair can take place without draining or shutting off the entire system. The controlled ice plug only forms beneath the Accu-Freeze jacket.

since 1910

MADE IN JAPAN

. . . ASK TENRYU !

 EXCELLENT QUALITY  INNOVATION  EXPERI ENCE FOR MORE THAN 100 YEARS  GLOBAL NETWORK  FOR THE BEST RESULTS IN CUTTING  ANY SIZE OF BLADE FOR ALL MACHINES

TCT-CIRCULAR SAW BLADES FOR CUTTING BAR/TUBE/PIPE

TENRYU SAW MFG. CO., LTD. | Japan, Fukuroi, www.tenryu-saw.com TENRYU EUROPE GMBH | Germany, Aalen, www.tenryu.de TENRYU AMERICA INC. | USA, Hebron KY, www.tenryu.com

TENRYU SAW DE MEXICO, S.A. DE C.V. | México, Silao, Guanajuato, www.tenryu.mx TENRYU (CHINA) SAW MFG. CO., LTD. | P.R. of China, Langfang, Hebei, www.tenryu.cn TENRYU SAW (THAILAND) CO., LTD. | Thail., Amiphur P., Rayong, www.tenryu-saw.com TENRYU SAW INDIA PVT. LTD. | India, Neemrama, Rajasthan, www.tenryu-saw.com

52

www.read-tpt.com

J anuary 2016