BULL 2516-1962

Evaporation Loss from Low-Pressure Tanks

BULL 2516-1962 发布历史

Introduction The term low-pressure tank@ as used in this evaporation loss bulletin@ refers to vessels having a maximum pressure vent setting in the range from just above atmospheric pressure to 15 psig and a vacuum vent setting normally 1 to 2 oz per sq in. The tanks are used for the storage of products@ such as motor gasoline@ pentanes@ and natural gasolines@ having a Reid vapor pressure up to 30 lb. Although a storage pressure of less than 2.5 psig may be used for some products@ the type of vessel construction does not permit appreciable economy by using lower design pressures. The loss principles applying to 2.5-psig to 15-psig pressure will also apply for higher or lower working pressures than the specified range. Low-pressure tanks are constructed in many sizes and shapes@ depending upon the operating pressure range. Fig. 1@ 2@ 3@ and 4 show typical types of construction. Pressure tanks differ from other conservation tanks in that they have neither moving parts nor a variable vapor space. The principle of operation is the same as that for the conservation vented fixed-roof tank. The basic difference is the ability of low-pressure tanks to withstand higher pressure variations. Because of this@ venting loss due to boiling and breathing loss due to daily temperature changes are prevented. By increasing the tank design pressure@ liquids of higher volatility may be stored without breathing loss. The Amount of loss from pressure storage tanks has been considered by users and tank manufacturers@ but few data are available. Therefore@ a theoretical basis has been used to estimate losses resulting from various storage conditions and types of products. Four types of losses are considered: breathing loss@ boiling loss@ working loss@ and leakage loss. Factors are discussed that affect the performance of low-pressure tank storage.

BULL 2516-1962由API - American Petroleum Institute 发布于 1962-01-01，并于 2003-11-19 实施。

BULL 2516-1962的历代版本如下：

• 1962年01月01日 BULL 2516-1962

非常抱歉，我们暂时无法提供预览，您可以试试： 免费下载 BULL 2516-1962 前三页，或者稍后再访问。

注意： 点击下载后，生成下载文件时间比较长，请耐心等待......

标准号

BULL 2516-1962

发布日期

1962年01月01日

实施日期

2003年11月19日

废止日期

无

中国标准分类号

/

国际标准分类号

/

发布单位

API - American Petroleum Institute

引用标准

18

适用范围

Introduction The term low-pressure tank@ as used in this evaporation loss bulletin@ refers to vessels having a maximum pressure vent setting in the range from just above atmospheric pressure to 15 psig and a vacuum vent setting normally 1 to 2 oz per sq in. The tanks are used for the storage of products@ such as motor gasoline@ pentanes@ and natural gasolines@ having a Reid vapor pressure up to 30 lb. Although a storage pressure of less than 2.5 psig may be used for some products@ the type of vessel construction does not permit appreciable economy by using lower design pressures. The loss principles applying to 2.5-psig to 15-psig pressure will also apply for higher or lower working pressures than the specified range. Low-pressure tanks are constructed in many sizes and shapes@ depending upon the operating pressure range. Fig. 1@ 2@ 3@ and 4 show typical types of construction. Pressure tanks differ from other conservation tanks in that they have neither moving parts nor a variable vapor space. The principle of operation is the same as that for the conservation vented fixed-roof tank. The basic difference is the ability of low-pressure tanks to withstand higher pressure variations. Because of this@ venting loss due to boiling and breathing loss due to daily temperature changes are prevented. By increasing the tank design pressure@ liquids of higher volatility may be stored without breathing loss. The Amount of loss from pressure storage tanks has been considered by users and tank manufacturers@ but few data are available. Therefore@ a theoretical basis has been used to estimate losses resulting from various storage conditions and types of products. Four types of losses are considered: breathing loss@ boiling loss@ working loss@ and leakage loss. Factors are discussed that affect the performance of low-pressure tank storage.