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HYDRAtube Replacement
1. Remove all pressure from piping system.
2. Disconnect the power source to the drive motor.
3. Adequately flush the reagent head and associated piping with a neutralizing liquid to
remove all toxic or hazardous product.
4. Close the suction and discharge shut off valves.
5. Disconnect the unions or flanges on the piping and drain
off any liquid. Use extreme caution if the product is
hazardous.
6.
Remove the top fill plug from the HYDRAtube housing.
Next place a pan under the housing and remove the
bottom pipe plug to drain the intermediate fluid. Note –
on models equipped with a CHEMALARM the bottom
pipe plug is replaced with a conduction probe. Refer to
separate instructions for removal and reinstallation of the
probe.
Figure 28
IF THE DIAPHRAGM HAS FAILED, INTERMEDIATE LIQUID COULD HAVE PROCESS LIQUID
MIXED INTO IT. IF THE PRIMARY DIAPHRAGM HAS ALSO FAILED, PRODUCT MAY HAVE
CONTAIMINATED THE PUMP OIL. HANDLE WITH PROPER CARE.
7. Remove the tie bars, valves, and valve adaptors from both suction and discharge.
FOR ELASTOMER HYDRATUBES FOLLOW STEPS 8
THROUGH 20. FOR PFA HYDRATUBES FOLLOW STEPS 21
THROUGH 35.
8. Pick up on the edge of the HYDRAtube flange and push
that same edge down the throat of the HYDRAtube. The
balance of the flange will fold and follow. (Figure 28)
9. Pull the HYDRAtube out from the bottom of the housing
by a combination of twisting and bending sideways.
10. Inspect for any damage (i.e. cuts, cracks, chemical
attack, or excessive deformation). Replace if necessary.
Figure 29
11. When installing a HYDRAtube do not use tools which may cut or damage the tube.
12. Obtain a rubber band
13. Fold a point on the edge of the flange upward. Push the
edge down the throat of the tube. Fold the sides of the
flange inward to form a compact 45° and wrap tightly
with a rubber band. This wrapped nose should be
reasonably compact and secure. (Figure 30)
14. Work with the wrapped nose of the tube up through the
bottom hole of the housing, rotating gently to work the
tube upward to the top of the housing.
15. With a slight push at the bottom flange of the tube, guide
the nose of the tube to the center and out of the top hole
in the housing.
Figure 30
16. If the HYDRAtube is one of the larger models, (inside is greater than 1 inch or 38.1mm) the
time required to fill the housing can be reduced by pouring the intermediate liquid past the
top flange while it is still folded.
