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Read all parts of this section before replacing elements. These procedures are provided for
general information only. Elements should be installed in accordance with the element
Always remove and install elements in the direction of feed flow. The feed end (upstream end) is
A record of element serial numbers and locations should be made and checked during loading.
Do not scratch or damage vessel bore when removing or installing elements.
Preliminary Steps
Do not proceed with step by step instructions
until...
1. All pressure has been relieved from the
vessel,
following
recommendations.
2. Both heads have been removed from vessel
following step by step instructions in the
"Opening the Vessel" section.
Step 1. Remove Element Interface Hardware.
1. Remove thrust ring from the downstream
(concentrate) end.
2.
Remove adapters from elements at each
end.
Step 2. Element Removal
1. Remove elements from the vessel following
element manufacturer's instructions. Clean
off any excess lubricant from vessel inside
diameter before removing elements.
Step 3. Element Loading
1. Examine the inside diameter of the vessel for
scratches or imperfections that may affect
sealing capability of head or element seals.
Corrosion deposits or other foreign matter,
including any excess lubricant, should be
removed as described in Section – Closing
the Vessel.
REPLACING ELEMENTS
IMPORTANT
manufacturer's recommendations.
the end plumbed most directly to the pump.
system
manufacturer's
2. Flush out the vessel with clean water to
remove any dust and debris.
Examining for scratches
3. Examine membrane element surfaces
for any imperfection which could scratch
the vessel bore. Pay particular attention
to
edges
of
(ATD/brine seal carrier).
4. Using an approximate 50% mixture of
glycerin in water, lubricate the inside of
the
vessel.
accomplished using a suitably sized
swab soaked in the mixture. This
procedure will ease membrane element
loading and reduce chance of scratching
the vessel bore.
NOTE:
If the brine seal is not installed on the
element and the element supplier does not
specify otherwise, a brine seal should be
placed on the upstream end of the
elements. Open side of a seal must face
upstream.
anti-telescope
device
This
may
best
Page 13 of 38
be
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