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RO/NF Membrane Start-up, Shutdown Guidelines

  • Categories:Technical
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  • Time of issue:2018-01-15 15:40
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(Summary description)It is important to be sure that the elements are loaded and shimmed correctly to remove any excess slack that may cause disconnects.

RO/NF Membrane Start-up, Shutdown Guidelines

(Summary description)It is important to be sure that the elements are loaded and shimmed correctly to remove any excess slack that may cause disconnects.

  • Categories:Technical
  • Author:
  • Origin:
  • Time of issue:2018-01-15 15:40
  • Views:8
Information
1. RO/NF System Start-up
 
It is important to be sure that the elements are loaded and shimmed correctly to remove any excess slack that may cause disconnects. A low pressure flush to purge air from the membranes is always recommended before a high pressure startup. This can be accomplished through the use of a soft-start mechanism, or a variable frequency drive. Failure to do this can result in a water shock wave (water hammer) that can cause physical damage to the RO/NF membranes. The permeate valves should always be open to drain during this flush to prevent damage to the membranes.
 
After the air has been purged from the system the feed pressure should be increased gradually up to the working pressure of the RO/NF unit. Pressurization (and depressurization) of the membrane elements should not exceed ten (10) psi/second (0.7 bar/second) at any time.
 
2. RO/NF System Shutdown
 
Upon shutdown RO/NF systems, a flush with the feed water at low recovery (brine valve wide open) is usually sufficient to remove the high concentration of salts from the membranes. The permeate valves should be open to drain during this flush to prevent damage to the membranes.

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