Related to Maximum operating pressure (MOP)

Operating pressure means the pressure at which the parts of an irrigation system are designed by the manufacturer to operate.
Working pressure means the settled pressure of a compressed gas at a reference temperature of 15 °C in a full pressure receptacle;
Reid vapor pressure means the vapor pressure of crude oil or other volatile petroleum products at 100 degrees Fahrenheit as determined by the latest edition of ASTM D6377 (RVPE): Standard Test Method for Determination of Vapor Pressure of Crude Oil.
Diameter at Breast Height (DBH) means the diameter of the trunk of a mature tree generally measured at a point four and a half feet above ground level from the uphill side of the tree. For species of trees where the main trunk divides below the 4 ½ foot height, the DBH shall be measured at the highest point before any division.
Low water pressure means water pressure below the regulatory reference level which is the minimum pressure when demand on the system is not abnormal.

Maximum operating pressure (MOP) definition