Hellenbrand HRO 6 Series, User Manual

Page: 27 / 59

27
HRO 6 07/26/12
MEMBRANE REMOVAL AND REPLACEMENT
Replacing membranes in the pressure vessels is an easy process if you have the proper information and
tools at hand. Please refer to the following instructions when removing and replacing membrane
elements:
WARNING: ALL PRESSURE GAUGES MUST READ ZERO BEFORE PROCEEDING.
BEFORE ATTEMPTING, DISCONNECT THE POWER FROM THE SYSTEM AND BLEED ALL WATER
PRESSURE FROM THE SYSTEM.
1. Remove the end plugs from the top of the pressure vessels. This is done by removing the two
half-moon retaining disks using a #5 Allen wrench; the end plugs should then freely slide out of
the pressure vessel.
2. Remove the replacement membrane element(s) from the shipping box; the membrane(s) should
be contained within a plastic oxygen barrier bag.
NOTE: WEAR GLOVES FOR THE FOLLOWING STEPS IN ORDER NOT TO CONTAMINATE THE
MEMBRANE.
3. Cut the bag open as close as possible to the seal at one end of the bag, so the bag may be re-
used if necessary.
4. Make sure that all parts are clean and free from dirt. Examine the brine seal, and permeate tube
for nicks or cuts. Replace the O-rings or brine seal if damaged.
5. Flow directions should be observed for installation of each element into their respective pressure
vessels.
REPLACING THE MEMBRANE ELEMENT:
WARNING: THE BRINE SEAL MUST BE IN THE SAME POSITION FOR EACH
MEMBRANE ELEMENT HOUSING, SO MARK EACH HOUSING PRIOR TO REMOVING THE
MEMBRANE ELEMENTS. THE BRINE SEAL IS A RUBBER SEAL THAT PROTRUDES ON
ONE SIDE OF THE MEMBRANE AND IS ALWAYS ON THE FEED SIDE OF THE
MEMBRANE ELEMENT.
1. Remove one membrane element at a time from the pressure vessels, from the top of each
housing. Long nose pliers may be necessary to pull the old membrane element out of the
membrane element housing.
2. Lubricate the brine seal with a non-petroleum based lubricant, such as Dow Corning® 111.
3. Install membranes with brine seal location depicted in (Figure 4, Page 26).
4. For brine seals that are on the bottom: At a slight angle insert the membrane while slightly
rotating the element being careful not to tear or flip the brine seal. A slow twisting motion should
be used to insert the membrane element, for every couple of turns pull up ½” to make sure the
brine seal doesn’t flip.
5. With a smooth and constant motion, push the membrane element into the housing so the brine
seal enters the housing without coming out of the brine seal groove.