On site pre-heating, hydrogen de-gassification and post weld heat treatment of pipework, welded fabrications and pressure vessels. Flexible electrical resistance heating elements are manufactured in a range of sizes to suit a wide range of applications and are connected to either low voltage (65 volt) or high voltage (240 volt) power sources. Each low voltage power source is rated at 50 kva, has a minimum of 6 individually controllable outlets and can power a maximum of 18 heaters of 2.7 KW. Temperature control is via pre-programmable microprocessor based modules and temperature measurement by pre-calibrated digital temperature recorders. All temperature measuring equipment is calibrated in accordance with national standards. The group has at its disposal more than 7,500 KW of applied resistance heat.