Hi Mical,
Thanks for your advise, since you touch on accessories of external relief valve, back pressure valve, I would like to know if there is any impact of using smaller size of accessories connection port.
Metering pump typical P & Id
Let say we have sized the BPV and PRV and Pulsation dampener and recommended based on flow and Stroke per minute is
1" Pulsation dampener
1" Back pressure valve
1" Pressure relief valve
However my discharge pump port is 2", shall this work if i maintain the 2" port and need to use reduce adaptor for every accessories ports
So to minimize the use of adaptor, trying to standardize the discharge port where the accessories would be installed.
Any situations if this exist for installation practice for metering pump where all the accessories are being installed with 1" port size.
I have read some article that we shall not downsize more than 1 size, i am not sure the technical reason behind other than this
[QUOTEDfrom whitepaper]
Discharge Side
Discharge piping in a pump system has virtu- ally
no effect on pump performance other than the
head loss that it creates. Optimal discharge
piping design will assist in minimizing installa-
tion and operating costs. Too small of pipe sizes, fittings and accessories will cause high velocities,
increased pressures and wasted energy.
Sizing the system piping too large will increase
the initial capital cost of the pipe, fittings and
[END]
However, reading another article, i believe this is not relevant to positive displacement, metering pump
[Quoted]
If the head height is smaller, the pump will move a little more water per minute; if it is larger, the capacity will diminish.
More importantly, the capacity rating of the sump pump is also based on using the right-sized discharge pipe. Most sump pumps have a built-in fitting for a certain sized discharge pipe, typically 1.25” or 1.5” inside diameter. (Because most sump pump discharge pipe is PVC, determining interior diameter is important. These pipes will be closer to 1.5” and 2” on the outside respectively.)
Using a properly sized pipe for discharge will ensure that the sump pump will perform as the manufacturer intended. Installing discharge pipe of a larger size is not a huge problem and is in fact recommended for longer runs of pipe, typically 20 feet or more.
The real problems occur when the diameter of the discharge pipe is too small. When the discharge pipe is smaller than recommended, the pump’s capacity and efficiency are reduced. The pump cannot push its rated volume of water through the small pipe and the increased friction creates back-pressure that makes it even more difficult to move the water.
End