4S-SERIES PRESSURE EXCHANGER ENERGY RECOVERY DEVICES
Energy Recovery, Inc.
32
ERI Document Number 80022-01-04
5.
Entrained or trapped air or other gasses must be purged from the SWRO system before pressurization.
Large bubbles in a pressurized system can result in damage to piping and equipment including the PX
unit.
6.
Feedwater flowing to the PX unit must be treated with nominal 10 micron cartridge filters.
7.
The PX unit must be isolated from the RO system when the membranes are being cleaned. If isolation
valves are not provided in the system design, the PX unit must be removed during cleaning.
8.
Chemicals that are not acceptable to the SWRO membrane manufacturers for application to the
membranes used at the plant are not acceptable to ERI. Chemical application levels and frequencies
must follow membrane manufacturer’s guidelines. Buyer will make a list of chemicals and their
application criteria (doses, residence times, etc.) available to ERI. In the unlikely event that it does
occur, Buyer is solely responsible for cleaning up any fouling of PX equipment which may result
from the dosing of any chemicals. Accordingly, warranty Limitations apply.
9.
In preparation for extended plant shutdowns, PX units must be flushed with permeate and a biocide as
instructed in ERI’s written Installation, Operation and Maintenance instructions.
10.
Flushing flow rates must not exceed the maximum allowable flow rate per PX unit.
