TPi January 2018

products & developments Remote monitoring of weld purge

up to 1km away When welding lengths of tube and pipework fabrications, as well as sections of pipelines of 20m length and more, one problem operators face is not receiving a fast and true weld purge reading from the purge zone. The PurgEye ® 1000 weld purge monitor from Huntingdon Fusion Techniques (HFT) makes it possible to have an immediate reading of the weld purge gas at the underside of the joint, from any distance up to 1,000m away. Luke Keane, distributor support for HFT, said, “By using a remote sensing head, which can be fitted onto any mechanical or inflatable tube and pipe weld purging system from 25mm (1") diameter upwards, the oxygen level can be measured directly at the weld

cause metallurgical defects leading to other problems. The PurgEye 1000 weld purge monitor has been designed and developed specifically to prevent oxidation under distance monitoring conditions, and has a sensor placed immediately next to the weld purge site. The sensor is secured in a small module that is mounted inside the purging system and is connected to the measuring instrument by a data cable. The purge reading is quickly sent back to the instrument, so operators and quality control personnel know immediately when the purge is satisfactory. The operator can be certain that the weld purge reading is correct and that the joint will not be adversely affected by oxidation, allowing welders to achieve zero-colour welds. The PurgEye 1000 measures oxygen levels from 1,000 parts per million (ppm) down to 1 ppm (accurate to 10 ppm), making it suitable for welding metals such as stainless steels, duplex steels, titanium and zirconium where oxide- free, zero-colour welds are consistently required. Huntingdon Fusion Techniques – UK

location and the information will be electronically transferred to the monitor up to 1km away. With this capability, the operator can be certain that the weld purge reading is correct and that the joint will not be adversely affected by oxidation.” The PurgEye 1000 is one of five HFT weld purge monitors to feature PurgeNet™, a networking device designed for communicating the current oxygen reading from the monitor to another piece of equipment, such as the visual warning accessory PurgeAlarm™ or a dew point monitor with additional inter-pass temperature monitoring. If exhaust gas from a normal weld purge system is piped down a hose to a distant measuring instrument, it may take many minutes, or even hours in some cases, for a stable reading to reach the sensor.

The exhaust gas may even be contaminated on the way by outgassing from the walls of the hose material or from air drawn in through a leaky connection. If the oxygen level is too high, the weld would become oxidised at best and might even have nitrogen and hydrogen absorbed into the joint at worst, which could

hft@huntingdonfusion.com www.huntingdonfusion.com Molecor widens product range with launch of DN710mm oriented PVC pipe PurgEye 1000 remote weld purge monitor with sensing head and tube

Among these characteristics are higher hydraulic capacity, enabling the conveyance of higher volumes of water for the same diameter; lightness, for easier manipulation and installation of pipes up to DN250mm; and better response to water hammer and enhanced impact resistance. The water tightness, another characteristic of the pipes, avoids leaks that would reduce the volume of water supplied. The pipe is manufactured in diameters from DN90 to DN800mm. Molecor Tecnología SL – Spain

Molecor, a company specialised in the development of molecular orientation technology applied to the manufacture of TOM ® PVC-O pipes (oriented PVC) for the conveyance of water under pressure, has implemented in its range the new DN710mm TOM pipes PN12.5, PN16, PN20 and PN25 bar. This will increase the possibilities of network design with diameters that ensure effectiveness in the required pressure and flow. The molecular orientation process is claimed to provide the TOMpipeswith better mechanical and hydraulic characteristics compared to pipelines manufactured with other materials.

info@molecor.com www.molecor.com

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TUBE PRODUCTS INTERNATIONAL January 2018

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