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Technical Service Bulletin JANUARY 2019 TSB132.05
HYDRAcap Module Installation Instructions and Rack Design
This Technical Service Bulletin provides information required to install HYDRAcap
Ultrafiltration modules and to demonstrate a sample support rack assembly.
General Guidelines/Rack Design
HYDRAcap is a stand-alone module capable of withstanding a pressure of 73 psig (5bar)
at 20°C. The following rules are applicable to its installation:
1. The modules should be installed vertically with the filtrate connection at the top
(see figure 1). Vertical installation is highly recommended. If horizontal orientation
is the only choice, the modules should be placed with the feed and concentrate
ports facing upwards to avoid air entrapment.
Figure 1: Flow Orientation
2. Feed water should enter the bottom of the module. Under certain conditions such
as high solid loading, it may be necessary to alternate the feed direction from
bottom-to-top to top-to-bottom.
Concentrate
Feed
Filtrate
All Connections
2” Victaulic
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3. The rack structure must be capable of supporting the weight of the HYDRAcap
modules as follows:
Module
Shipping Weight
Weight Full of Water
HYDRAcap60
97 lbs (44 kg)
177 lbs (80 kg)
HYDRAcap60-LD
97 lbs (44 kg)
177 lbs (80 kg)
HYDRAcap60+
97 lbs (44 kg)
177 lbs (80 kg)
HYDRAcap40
63 lbs (28 kg)
116 lbs (53 kg)
HYDRAcap40-LD
63 lbs (28 kg)
116 lbs (53 kg)
4. A suggested rack design is shown in figure 2. Hydranautics suggests double
Victaulic flexible joints to connect all three ports of each module to the rack piping
for the following reasons:
A. The thermal expansion coefficient of PVC is 3.5 x10-5 inch/inchF. As a
result a HYDRAcap60 module can expand 4mm over a temperature range
of 70F. A double Victaulic connection can accommodate this deviation.
B. The rack headers have a certain tolerance on the side port angles.
C. A 3” spool piece with 2 Victaulic connections allows a port-to-port tolerance
of 7 mm and can handle alignment angle issues.
Figure 2: Double Victaulic flexibe joint
5. The modules should be supported at the center of the bottom end cap. At least
one strap and one saddle should be utilized to hold the modules to the support
structure.
6. A 6” section of clear PVC is required in the filtrate exit line to identify modules that
have lost integrity.
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Figure 3: System design example with straps, site glass and well supported.
7. The HYDRAcap module is preserved in a solution of 0.95% sodium bisulfite. This
solution is relatively non hazardous, with NFPA ratings of the following:
Health ………… 1
Fire ………... 0
Reactivity … 0
If the caps are removed from the modules,1L of this solution will drain. If the
modules are to be subsequently shipped, they must be re-preserved via
Hydranautics TSB131.
CAUTION: WEAR PERSONAL PROTECTIVE EQUIPMENT WHEN
HANDLING SODIUM BISULFITE. SODIUM BISULFITE CAN CAUSE SKIN
AND EYE IRRITATION.
8. THE MAXIMUM FEED PRESSURE ALLOWED FOR HYDRAcap IS 73 PSIG
(5bar) at 20°C.
2 x Support
Straps per
Module
Modules
supported on
Center
Clear PVC
site glass
End Cap
Clamps
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Figure 4: Sample Rack Assembly
Installation Procedure
The HYDRAcap modules are shipped from the factory with a preservative solution. The
end cap clamps are tightened and plastic caps are placed on all ports to retain the
preservative. Prior to installation, the user may wish to rinse the preservative from the
modules. The following is the recommended installation procedure:
1. Clean the system and it’s piping sufficiently to prevent foreign matter from
entering the modules.
2. Remove the plastic caps on the three connection ports (See figure 5 below).
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Figure 5: Module port caps and plugs.
3. Place the module on the support rack such that the bottom end cap is
supported near its center. Hold the modules in place with the strap(s) that
attach to the support structure. Utilize curved saddles to cushion the modules
to the support rack.
4. If needed, loosen the end clamps such that the upper and lower ports can be
mechanically adjusted to line up with the side ports on the headers. Line up
the ports and then tighten the end cap clamps such that there is no gap
between the metal ends (See Figure 3).
5. Connect all ports starting with the bottom (feed) port and working up. A spool
piece with double Victaulic connections is recommended. Tighten all Victaulic
clamps. Slowly pressurize the system and check for connection leaks.
6. Flush thoroughly with permeate or city water.
Hydranautics
401 Jones Rd.
Oceanside, CA 92058
Tel: (760) 901-2500
Fax: (760) 901-2578
email: info@Hy-Nitto.com
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