Is it necessary to install a check valve at the boiler inlet of the chemical dosing pipeline for the high-pressure boiler?
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Is it necessary to install a check valve at the boiler inlet of the boiler dosing pipeline? There is a check valve at the outlet of the chemical dosing pump.
Yes, otherwise there will be backflow after the pump stops.
Wrong, no need. One check valve is sufficient.
The outlet pressure of the centrifugal pump exceeds 4 MPa, so two check valves are installed.
The dosing pump is a hydraulic diaphragm metering pump that delivers very small amounts of dosage.
A check valve is installed on the chemical dosing pipe at the boiler inlet of Unit 135 in a certain plant, while there is no check valve on the chemical dosing pipe at the boiler inlet of Unit 300. I would like to know if there are any regulations regarding this.
It’s optional to include personal suggestions, but there are issues related to design patterns and actual installation; however, a stop valve must be installed at the entrance.
Our unit’s outlet is equipped with a check valve; it would be bad if flow reversed back
With a bunch of reasons added on. Even without it, there are tons of reasons. There is simply no regulatory basis. . . . . . . . . . . .
If it has already been added, there is no need to make any changes. If it hasn’t been added yet, you can discuss it with the designer to reduce the number by one. However, it should be noted that if there are still branch pipes between the pump outlet check valve and the air tank, then two of them are necessary