Classification of Accuracy Grades for Petroleum Measuring Cans

Classification of Accuracy Grades for Petroleum Measuring Cans

Classification of Accuracy Grades for Petroleum Measuring Cans (Standard Metal Measures)

The accuracy grades of petroleum measuring cans are primarily classified in accordance with national metrological verification regulations. Fundamentally, they are divided into two levels: First-Class Standard Metal Measures and Second-Class Standard Metal Measures.
1. First-Class Standard Metal Measures

Maximum Permissible Error: ±0.01% to ±0.05% (typically ±0.025%)
Application: Serve as primary metrological standards; utilized by metrology institutes and verification agencies.
Function: Used to verify Second-Class measuring cans, flowmeters, fuel dispensers, etc., and for the dissemination of measurement values.
2. Second-Class Standard Metal Measures

Maximum Permissible Error: ±0.1% to ±0.2%
Application: Used in field settings at oil depots, gas stations, and on oil tankers.
Function: Used to directly verify fuel dispensers and flowmeters; utilized for trade settlement and on-site calibration.
Simplified Explanation:
First-Class = Laboratory Standard; used to calibrate other measuring cans.
Second-Class = Field-Work Standard; used directly to verify fuel dispensers.