1. The measurement point position of the pipe is set on the straight pipe section with stable velocity. 

2. The pipe resistance between the pressure measurement point and the combustor of primary air duct or secondary air duct of the boiler shall be equal. 

3. As for measuring the gas pressure, the measuring point is at the upper part of the pipe. 

4. As for measuring the pressure of turbid medium with dust or gas powder mixture, the pressure tapping device with anti-blocking and purging structure is adopted.