English to French Tech/Engineering Petroleum Eng/Sci

Hello,
How would one say HPS in French, described as per the definition given below, from the Bharat Petroleum website (Link: http://www.bharatpetroleum.com/EnergisingBusiness/FIP_Fuels....
)?


Low Sulphur Heavy Stock (LSHS) and Heavy Petroleum Stock (HPS)

LSHS and HPS are residual fuels produced after processing of indigenous crudes. These have high pour points and require special handling arrangements. LSHS has special advantage of having low Sulphur content and high calorific value. These are used in lieu of furnace oil in the same applications where furnace oil is suitable.

Thank you for your help.