According to the requirements of the national metrological verification system tables. Gas transfer pump' second-class standard metal basket by first-class standard metal gauge dissemination, its verification program, including appearance inspection, leak test, exhaust and drainage ability test, material and wall thickness inspection, volume of verification and calibration measurement neck dividing volume.
The plan in detail and the method is:
Environmental requirements: external gear pump metal gauge calibration standard environmental temperature change scope of the laboratory at 20 ℃ + 5 ℃, verification, hydraulic piston pump lab environment temperature and the water temperature is not more than + / - 5 ℃, the difference between the test medium for tap water.
Verification before get ready:
1) second class standard metal gauge should be carefully cleaned with water before testing the wall;
2) one, second-class standard metal gauge should advance water injection to scale line after a certain range, hydraulic piston pump placed in the test room to keep more than 4 hours, the balance of its temperature and room temperature external gear pump;
The specific methods:
1) inspection: the inspection standard gauge of metal appearance, to meet the requirements of the standard metal basket;
2) gas transfer pump leak test: the second class standard metal basket filled with water to a certain scale line, placed in the lab more than 4 hours, each joint and the outer surface should be no leakage phenomenon.
3) gas transfer pump exhaust and drainage ability test: pushed second-class standard metal leveling, water injection to a certain scale line, beating standard metal gauge, liquid level changes must not exceed 0.2 degree volume;Will be in the form of maximum emissions second-class standard metal basket draw off, in the condition of drip wait for 2 minutes, can not have intermittent surge of continuous flow and flow discharge.
4) standard gauge metal material and wall thickness inspection: place the external gear pump magnet in the second class standard metal surface again, hydraulic piston pump should not have attracted phenomenon occurred;Using ultrasonic thickness meter testing standard metal basket of cylinder wall thickness, wall thickness should be 2.5 mm or more.