52
Ventura Flow Test
The flow test is the most useful diagnostic test for system performance, and should be done be-
fore replacing or cleaning your membrane. Changes in production or water quality are normally
caused by something other than the membrane, unless the system has been left unused for a
long time.
Before the flow test, change all filters and clean the sea strainer. Carefully check for water or air
leaks, as air in the system will cause low production and erratic salinity. Look for air bubbles in
the product flow meter, feed water hoses, and brine overboard hose.
Run the system and watch the feed pressure very closely. If the feed pressure to the Clark Pump
is asymmetrical from one stroke to another, this could be part of the problem. A difference of a
few PSI is acceptable, but anything over that is an issue. If the pump is asymmetrical, Clark Pump
repairs should be done before continuing with these tests.
If no asymmetry is noted, continue with this test.
Make sure the ShurFlo overpressure cutout switch (PL-PMP-SFPH) is set to 125 PSI. With the
pump running, close the brine discharge thru-hull or kink the brine discharge hose. The feed
pressure should rise to 125 PSI, then the pump should shut off. If the pump shuts off at a lower
pressure see Adjust ShurFlo Pressure Switch on page 45.
You will need a graduated bucket, either a graduated pitcher or large measuring cup, and a stop-
watch. Before the flow test, change all filters and clean the sea strainer. Log the voltage at the
feed pump at the same time. Confirm at least 12.5 Volts at the feed pump on 12-Volt DC sys-
tems; 25 volts on 24-Volt DC systems.
Take two measurements and compare them with the table on the following page. The first
measurement is the product flow alone. The second is the product flow combined with the brine
discharge flow to get the total flow or feed flow. You may take these measurements by two
methods:
1. Time the product flow into a graduated pitcher, then divert both the product flow and brine
discharge together into a bucket to measure total flow.
OR
2. Divert the product flow into the pitcher while diverting the brine discharge into the bucket.
Time the flow of both. After calculating the product flow, pour the pitcher of product into the
bucket of brine to measure total flow.
The ratio of product flow to total flow gives us our recovery rate, as a percentage. If the percent-
age is below the minimum it indicates an internal leak in the Clark Pump.
Summary of Contents for Ventura 150T MPC
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Page 4: ...4 ...
Page 7: ...7 Installation ...
Page 8: ...8 ...
Page 14: ...14 ...
Page 28: ...28 ...
Page 29: ...29 Operation ...
Page 30: ...30 ...
Page 38: ...38 ...
Page 39: ...39 Maintenance Storage and Troubleshooting ...
Page 40: ...40 ...
Page 60: ...60 ...
Page 61: ...61 MPC 5000 Programming and Controls ...
Page 62: ...62 ...
Page 72: ...72 ...
Page 74: ...74 ...
Page 75: ...75 Exploded Views and Part Numbers ...
Page 76: ...76 ...
Page 84: ...84 Parts HP CYL 3 4R ...
Page 85: ...85 PL MTS 3 8X1 2S HP CYL SST HP CYL CCA SO HPP ECCB HP CYL EC HP CYL R HP CYL PT Parts ...
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