API BUL 2521-1966

$39.00

Use of Pressure-Vacuum Vent Valves for Atmospheric Pressure Tanks to Reduce Evaporation Loss

Published By	Publication Date	Number of Pages
API	1966	12

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Description

FOREWORD

Evaporation loss from crude oil and its products has long been a subject of concern to the petroleum industry. Over the years, companies have studied specific loss problems and have taken numerous steps to reduce evaporation loss. Such reduction also has helped maintain product quality and promote safety.

The pressure-vacuum vent valve is an important device, which is used to reduce evaporation loss from volatile liquids stored in ked-roof tanks and in variable-vapor-space systems. The principles presented in this bulletin will aid engineers responsible for the selection of these vents by defining the factors to be considered. In addition, the bulletin serves to increase the awareness of operational and maintenance requirements.

The American Petroleum Institute takes no position as to whether any method, apparatus, or product mentioned herein is covered by an existing patent, nor as to the validity of any patent alleged to cover any such method. Furthermore, the information contained in this bulletin does not grant the right, by implication or otherwise, for manufacture, sale, or use in connection with any method, apparatus, or product covered by letters patent; nor does it insure anyone against liability for infringement of letters patent.

This bulletin may be used by anyone desiring to do so, but the American Petroleum Institute shall not be held responsible or liable in any way either for loss or damage resulting therefrom, or for the violation of any federal, state, or municipal regulations with which it may conflict.

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