Oil & Gas Plant Engineers India Private Limited offers Liquid Petroleum Gas - LPG Propane Ammonia Vaporizers. Oil & Gas Plant Engineers India Private Limited has achieved ISO 9001:2000 certifications. Liquid Petroleum Gas - LPG Propane Ammonia Vaporizers is designed by dry type electrically heated vaporizers called `zimmer` and steam hot water heated vaporizers of very-very large capacities. Liquid Petroleum Gas - LPG Propane Ammonia Vaporizers is approved by explosives department. These units are approved by factory mutual, UL, CE and other statutory authorities in US and Europe.