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Maintenance :
Monitoring the water quality.
The performance of the RO system is directly related to the quality of the incoming raw water. It is critical
that an on-site water-sampling schedule be originated to monitor the performance of the RO system.
By comparing specified rejection rates to those experimentally observed, the performance of the RO
system is determined. For example, if the raw water feed and RO clean water total hardness are
measured at 200 ppm and 5 ppm respectively, this is indicative that the system is performing adequately,
as the normal rejection level for this compound is [200 ppm x 95% = 10 ppm].
Three (3) water test drains (gg, qq, and uu) have been provided to retrieve samples of the raw, clean, and
injection water flows – make sure to run the test valve for a few seconds to get a fresh water sample. It is
recommended that the following devices be available to check the water quality:
•
Test strips. Hach (1-800-227-4224) supplies a vial with 50 strips which monitor 5 different
water parameters (total chlorine, free chlorine, total hardness, total alkalinity, and pH) in a
single paper strip (Cat. No. 27552-50). One other vial with 25 strips, monitors total iron (Cat.
No. 27453-25), a very common contaminant (rust) in water pipes. A test only involves
inserting the test strip in a water sample and comparing the resulting color changes to a
chart printed on the vial. The results indicate gross water quality for trending purposes and
serves as an early warning of upsets conditions that may require a formal laboratory
analysis.
•
TDS analyzer. Hach (1-800-227-4224) has available a pocket unit, Cat. No. 44400-00, which
measures the total dissolved solids in water samples.
CAUTION
It is recommended that the quality of the water be checked weekly after the
package is commissioned or after major repairs (e.g., airend exchange) take
place. If consistent results are obtained, the testing interval can be extended to
longer testing periods, but these should not exceed 4 weeks.
CAUTION
The use of make-up water exceeding the quality limits outlined in the “RO Water
Filter”, SECTION 8, may result in damage to critical compressor components by
corrosion and/or scaling action of impurities in the water.
Содержание PUREAIR EWC99C
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