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VNX CEDI Modules
Page 21 IP-MAN-VNX-1019-EN.pdf
5. START-UP PROCEDURE
5.1. Test Interlocks
· Test flow switches and other interlocks, including the RO interlock if applicable
· Test pressure relief if applicable
· Set alarm points
5.2. Startup of VNX Modules
· Make sure that modules are correctly connected to the DC power source.
· Make sure that the VNX product line is directed to drain.
· Turn on the feedwater. Adjust pump and/or valves to obtain the desired flows and
pressures in the product and reject streams. The reject flow is typically set at about
11% of the product flow (this gives a water recovery of 90%). See Section 5.4, below.
· Valves are adjusted so the product outlet pressure is about 2 to 5 psig (0.1 to 0.3 bar)
higher than the reject outlet pressure at the desired flow rates.
· Adjust the DC power supply to the current setting determined in section 4.2.
· Test all flow switches and interlocks to ensure VNX DC power is shut off when flow is
interrupted.
· Continue to direct the product water to drain until it reaches the desired quality.
· Once product reaches the desired quality, connect to process. Readjust pressures as
required to maintain product outlet pressure 2 to 5 psi (0.1 to 0.3 bar) above the reject
outlet pressure.
· Record operating data daily on suitable log sheet (see example in section 7.0). The
CEDI system should achieve steady-state operation in a few days,
5.3. Minimum Reject Flow Rate
Table 5-1 Minimum Reject Flow Rates for Various VNX Modules
Module Type gpm M
3
/hr
VNX-MINI-1 1.7 0.39
VNX-MAX-1 2.1 0.48
VNX28EP-2 0.9 0.20
VNX55EP-2 1.8 0.41
VNX55E-2 0.6 0.14
VNX55EX-2 0.9 0.20
VNX55HH-2 1.8 0.41
VNX15CDIT-2 1.6 0.36
VNX30CDIT-2 3.1 0.70
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