INTRODUCTION The objective of this report is to present procedures for estimating evaporation and handling losses of liquid petroleum products with volatility equivalent to or lower than motor gasoline. Typical conditions under which handling or storage losses may occur are as follows: 1. Breathing losses during product storage. 2. Working losses from filling terminal and bulk storage tanks. 3. Losses from filling tank cars and tank trucks. 4. Losses from filling service station tanks. 5. Losses from transfer pumps The procedures outlined in this report can be used to estimate the evaporation and handling losses for aviation gasoline and JP-4 turbine fuel. This report does not include methods for estimating losses resulting from filling vehicle fuel tanks or accidental spillages. The tabulation on the movement of less volatile products such as fuel oils is recommended as a matter of information for future reference. The handling and distribution losses for a specific product are influenced by a number of variables. For example@ losses from storage tanks are a function of tank size@ type of roof@ paint color@ outage@ and thruput. For an accurate calculation of the transfer and handling losses@ basic information on the above pertinent variables must be secured. More detailed information on the significance of these variables can be obtained from the bulletins listed in the bibliography.