IP 317: Determination of residues in liquefied petroleum gases - Low temperature evaporation method

Overview:

This standard specifies a method for the determination of the materials weathering above 38°C which may be present in liquefied petroleum gases (LPG).

NOTE 1
The results obtained when testing liquefied petroleum gases that contain alcohols to enhance their anti-icing behaviour may be affected by the alcohols.

NOTE 2
The result may be expressed in terms of measured volumes or indices derived from these volumes. In either case, the method provides an indication of the quantity and nature of materials in the product that are substantially less volatile than the liquefied petroleum gas hydrocarbons.

NOTE 3
Control over the residue content is of considerable importance in end-use applications. In liquid feed systems residues may lead to troublesome deposits and, in vapour offtake systems, residues that are carried over may foul regulating equipment. Those that remain will accumulate, may be corrosive, and will contaminate any following product. Water, particularly if alkaline, can cause failure of regulating equipment and corrosion of metals.