Oil & Gas Plant Engineers India Private Limited supplies Liquid Petroleum Gas - LPG Submersible Pumps. Oil & Gas Plant Engineers India Private Limited has been awarded ISO 9001:2000 certifications. Liquid Petroleum Gas - LPG Submersible Pumps for underground LPG tanks mainly for ALDS Systems but also for bulk storage installations or for that matter any other application. Liquid Petroleum Gas - LPG Submersible Pumps are normally installed in a 6" NB capsule which goes inside the tank to facilitate easy removal for any maintenance services etc.