LI Yun,MA Hui-jun.Selection of Pressure Reducing Mode for Excess Dynamic Pressure at Fire Hydrant Outlet[J].China Water & Wastewater,2021,37(20 20):47-51.
Selection of Pressure Reducing Mode for Excess Dynamic Pressure at Fire Hydrant Outlet
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
20 20
Page:
47-51
Column:
Date of publication:
2021-10-17
- Keywords:
- dynamic pressure of hydrant outlet; pressure reducing orifice plate; pressure reducing and stabilizing fire hydrant
- Abstract:
- When dynamic pressure of a hydrant outlet is between 0.50 MPa and 0.70 MPa, there are differences in the design and selection of pressure reducing methods. Therefore, technical characteristics of pressure reducing orifice plate and pressure reducing and stabilizing fire hydrant were analyzed, variations in technical parameters of pressure reducing and stabilizing fire hydrant in new and old standards and atlases were compared, and production testing status and pressure reducing performance of this type of hydrant were investigated. After comprehensive comparison of the two pressure reducing methods, following conclusions were obtained: the product standard of pressure reducing and stabilizing fire hydrant did not match the specification, and the type of hydrant in the product standard could not fully meet the hydrant outlet pressure requirements in the code; it was suggested that pressure reducing orifice plate should be used when hydrant outlet pressure was 0.50-0.70 MPa, and the type Ⅲ pressure reducing and stabilizing fire hydrant in the atlases should be used for pressure reduction when the hydrant outlet pressure was above 0.70 MPa.
Last Update:
2021-10-17