Profile: Raychem RPG Pvt.Ltd specializes in providing engineered electronic components, industrial products and network solutions & systems for telecommunications. We are an ISO 9001:2008 and ISO 14001:2004 certified company. We also offer wireless systems for critical communications. In hermetically sealed transformers, pressure variation due to oil expansion is absorbed by the flexible corrugated steel tank (variable volume tank design), where by the maximum operating pressure remains at only a fraction of the usual. Bushings can be exchanged from the outside without draining the oil below the top of the active part. The tank cover is equipped with a filling pipe which is high enough to ensure a safe oil filling level in the insulating elements at all times for bushings.