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Lay out all the parts on a clean tabletop.
Make sure you have all parts. There should be a body, roughly rectangular in shape, two
end-plates, two frits, two gaskets, three end caps, one port plug and a sufficient
quantity of machine screws. You will also need an allen key to tighten and loosen the
screws. The body should have a connector already screwed in, and the end caps should have
two similar connectors screwed into them. Here is a list of all the parts::
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| Body |
One |
| end plate, small |
One |
| gasket, small |
One |
| frit, small |
One |
| end plate, large |
One |
| gasket, large |
One |
| frit, large |
One |
| packing port plugs |
one |
| packing port caps |
One |
| inlet/outlet port caps |
Two |
| Machine screws |
Sufficient quantity |
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Stand the body up on it’s large end. Insert the small frit into its location at
the small end of the body so the fine frit is facing inside.
FIGURE 1
Place the small gasket in the small end-cap.
FIGURE 2
Put this assembly face-down on the body/frit, and loosely hand-fasten with the screws
provided.. Do not tighten the screws yet.
FIGURE 3
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Check to ensure that the gasket is seated correctly , and move the end-cap around as
needed to seat the gasket properly. Use the allen key to tighten the screws, alternating
each side and gradually increasing the torque. Do not overtighten else the threads in the
body may get stripped.
Repeat these steps on the other, larger end. Your wedge should be looking like in
figure 4 at this time.
FIGURE 4
Your wedge column is now ready to be tested for proper assembly.
Use one of the end-caps to close off the packing port. Use the supplied tubing to
connect the inlet to a pressure gauge and pump, the other end through a tube and pinch
clamp to waste.
Pump clean, DI water into the wedge to displace all the air, until the water comes out
of the other end. The wedge will have to be tilted to get all the air out. Stop the pump
and shut off the outlet tube with the pinch valve provided. Restart the pump very
slowly until the pressure reaches 5 psi only. Shut off the pump. Check
for leaks, if any. If no leaks are observed, pump up the pressure up to 10 psi, stop and
check for leaks again. Repeat in 5 psi increments up to the rated pressure of the wedge,
25 psi. If no leaks have been observed, your wedge is considered ready for use. If leaks
were observed at any pressure, read on.
Checking and fixing leaks after assembly
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| Leakage at end-caps. |
The most common cause of leaks is improper
assembly. If the end-caps are not tightened down uniformly, one side will not sit flat on
the seal and body, resulting in a leak. Unscrew the end-cap, and tighten it down uniformly
all around, increasing the force applied a little each time. Ensure the gaskets are
properly seated. |
| Leakage at packing ports |
- Port plugs are loosely screwed in. Tighten.
- Port caps are loose. Tighten.
- There is insufficient PTFE tape on the threads. Wind at least 4 tight turns and
re-assemble.
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| Leakage at inlet/outlet ports |
- Port plugs are loosely screwed in. Tighten.
- Port caps are loose. Tighten.
- There is insufficient PTFE tape on the threads. Wind at least 3 tight turns and
re-assemble.
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| Leakage at body joints |
Manufacturing defect. Call Sepragen customer
service, get an RGA number and return the product. Make sure you pack the wedge properly
and write the RGA number prominently on the outside as well as inside the box. |
| I don’t know where it’s leaking, but
it is wet all over. |
- Condensation on cold surface. Let the wedge and water come to room temperature.
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