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API MPMS 3.1B-2001 pdf free download

API MPMS 3.1B-2001 pdf free download.Manual of Petroleum Measurement Standards Chapter 3—Tank Gauging Section 1B—Standard Practice for Level Measurement of Liquid Hydrocarbons in Stationary Tanks by Automatic Tank Gauging.
3.1B.4 General This section applies to all types of ATGs. This standard presents both Metric (SI) units and US Cus- tomary units and may be implemented in either system of units. The presentation of both units are for convenience of the user and are not necessarily exact conversions. The units of implementation are typically determined by contract, regu- latory requirement, the manufacturer or the userÕs calibration program. Once a system of units is chosen for a given appli- cation, it is not the intent of this standard to allow arbitrarily changing units within this standard. Safety precautions are listed separately from general pre- cautions that affect accuracy or performance. Note: The following precautions are given in addition to any existing federal, state, or local regulations (for example, the Occupational Safety and Health Administration) that govern practices described in this standard. Users of this standard should be familiar with all appli- cable safety and health regulations. 3.1B.4.1 SAFETY PRECAUTIONS These safety precautions represent good practice. This list is not necessarily complete or comprehensive. Refer also to the safety precautions described in API Recommended Prac- tice 2003. 3.1B.4.1.1 Tank Entry Before a tank that once contained hydrocarbon liquids, vapors or toxic material is entered, all lines to the tank shall be disconnected or blinded and a gas-free certiÞcate shall be obtained. 3.1B.4.1.2 Hazardous Areas All regulations covering entry into hazardous areas shall be observed. Electric equipment for use in electrically classiÞed areas shall meet the area classiÞcation. Refer to the following API Recommended Practices (RPs): a. RP 500. b. RP 2003. 3.1B.4.1.3 Maintenance All ATG equipment shall be maintained in safe operating condition and manufacturersÕ instructions shall be complied with. 3.1B.
3.1B.4.1.5 Sealing All ATGs shall be sealed to withstand the vapor pressure of liquid in the tank. 3.1B.4.1.6 Manual Gauging Manual tank gauging can be associated with exposure to immediately dangerous chemicals. When an ATG is checked or calibrated by manual gauging, the manual gauging should be done in accordance with MPMS Chapter 3.1A. 3.1B.4.1.7 Speed of Response ATGs should have sufÞcient dynamic response to track the liquid level during maximum rates of tank Þlling or emptying. 3.1B.4.2 GENERAL PRECAUTIONS The following general measurement precautions affect the accuracy and performance of all types of ATGs. They should be observed where they are applicable. 3.1B.4.2.1 Tank Temperatures Tank temperature should be measured at the same time the tank level is measured. The tank temperature should be repre- sentative of the tank contents in accordance with MPMS Chapter 7. 3.1B.4.2.2 Recording Levels Level measurements should be recorded as soon as they are taken, unless the remote readout equipment of the ATG system automatically records the levels periodically. 3.1B.4.2.3 Opening and Closing Gauges The same procedures should be used to measure a tank level before the product transfer (opening gauge) and after the product transfer (closing gauge). 3.1B.4.2.4 Compatibility All parts of the ATG in contact with the product or its vapor should be compatible with the product to avoid both product contamination and ATG corrosion. The ATG should be designed to meet the operating conditions. 3.1B.4.2.5 Settling Time Refer to MPMS Chapter 3.1A for guidance on settling time before tank levels are measured. 3.1B.4.2.6 ATG Security ATGs should provide security to prevent unauthorized adjustment or tampering. ATGs used in custody transfer applications should provide facilities to allow sealing for cali- bration adjustment.

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