Dear Abhay,
My personal advice: "Please don't take any chances and seek general guidance on LPG storage and usage." The guidance should come from professionals who have many years of experience in handling safety and statutory requirements. Remember, you or your company will be held responsible for any mishap.
For expert advice, please contact Mec Elec Industries in Mumbai. I believe the contact person is Divekar or Godbole. You can find more information on their website:
http://www.mecelec.in/index.php
I had the opportunity to work with them some years ago, and I found them to be very proficient in SMPV act-related tasks, including audits, guidance, and license management.
Remember, safety is paramount. All the best!
Regards,
Rajeev