Hello njjicheng,
If you will run the new pump in parrallel with the old two it is not a good idea to have a smaller pump since they will have a constant TDH (HEAD) and combined capacity. Just I said you have to provide the pump curve (curve characteristic) of the old two pumps to the pump manufacturer for them to have proper pump size selection.
If you have problem communicating with the EOM of your existing pump you may contact me at
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.
Regards,
