As you have asked about the Hindustan Petroleum Corporation Limited (HPCL), I am giving you information about it

Hindustan Petroleum Corporation Limited (HPCL) is a type of an Indian state-owned oil and natural gas company.
It was formed in the year 1974.
It’s headquarter is located in Mumbai, Maharashtra India.
Its products are:
Petrol
Diesel
Lubricants
Liquified petroleum gas
Aviation Turbine Fuel
Bitumen
Emulsion

Refineries

HPCL has a number of refineries in India. Some are listed below:

Mumbai Refinery - 6.5 Million Metric Tonnes (MMT) Capacity
Visakhapatnam Refinery - 8.3 MMT at Visakhapatnam
Mangalore Refinery Pvt. Ltd. - 9.69 MMT at Mangalore, Karnataka(HPCL has 16.65% Stake).
Guru Gobind Singh Refinery - 9 MMT at Bathinda, Punjab (HPCL & Mittal Energy each have 49% stake).
Barmer Refinery -9 MMT Capacity. It is a Joint Venture with Rajasthan Government.

Contact:
Hindustan Petroleum Corporation Limited.
Petroleum House,
17, Jamshedji Tata Road,
Mumbai 400020.
Maharastra, India.