Crane EPRO-150 - Page 39

Salt Passage
Permeate
Flow
Pressure Drop
NORMAL to
INCREASED
DECREASED NORMAL to
INCREASED
PREDOMINATELY
FIRST STAGE
METAL OXIDE
FOULING
ANALYSIS OF METAL IONS
IN CLEANING SOLUTION
IMPROVE PRETREATMENT TO
REMOVE METALS. CLEAN WITH
ACID CLEANERS.
NORMAL to
INCREASED
DECREASED INCREASED PREDOMINATELY
FIRST STAGE
COLLOIDAL
FOULING
SDI MEASUREMENT OF
FEED WATER
OPTIMIZE PRETREATMENT FOR
COLLOID REMOVAL. CLEAN
WITH HIGH pH ANIONIC
CLEANERS.
INCREASED DECREASED INCREASED PREDOMINATELY
FIRST STAGE
SCALING (CaSO4,
CaSO3, BaSO4,
SiO2)
ANALYSIS OF METAL IONS
IN CLEANING SOLUTION
CHECK LSI OF REJECT.
CALCULATE MAX
SOLUBILITY OF CaSO4,
BaSO4, SiO2 IN REJECT.
INCREASE ACID ADDITION AND
ANTISCALANT DOSEAGE FOR
CaVO3 AND CaCO4. REDUCE
RECOVERY. CLEAN WITH ACID
CLEANERS.
NORMAL to
MODERATE
INCREASE
DECREASED NORMAL to
MODERATE
INCREASE
ANY STAGE BIOLOGICAL
FOULING
BACTERIA COUNT IN
PERMEATE AND REJECT.
SLIME IN PIPES AND
PRESSURE VESSELS.
SHOCK DOSAGE OF SODIUM
BISULFATE. CONTINUOUS FEED
OF SODIUM BISULFATE AT
REDUCED Ph. FORMALDEHYDE
DISENFECTION. CHLORINATION
AND DECHLORINATION.
REPLACE CARTRIDGE FILTERS.
DECREASED or
SLIGHTLY
INCREASED
DECREASED NORMAL ANY STAGE ORGANIC FOULING DESTRUCTIVE TESTING ACTIVATED CARBON OR OTHER
PRETREATMENT. CLEAN WITH
HIGH Ph CLEANER.
INCREASED INCREASED DECREASED MOST SEVERE IN
FIRST STAGE
CHLORINE
OXIDATION
CHLORINE ANALYSIS OF
FEED WATER.
DESTRUCTIVE ELEMENT
TEST.
CHECK CHLORINE FEED
EQUIPMENT AND
DECHLORINATION SYSTEM.
INCREASED INCREASED DECREASED MOST SEVERE IN
FIRST STAGE
ABRASION OF
MEMBRANE BY
CRYSTALLINE
MATERIAL
MICROSCOPIC SOLIDS
ANALYSIS OF FEED.
DESTRUCTIVE ELEMENT
TEST.
IMPROVE PRETREATMENT.
CHECK ALL FILTERS FOR MEDIA
LEAKAGE.
INCREASED NORMAL to
INCREASED
DECREASED AT RANDOM O-RING LEAKS, END
or SIDE SEAL LEAKS
PROBE TEST. VACUUM
TEST. COLLODIAL
MATERIAL TEST.
REPLACE O-RINGS. REPAIR OR
REPLACE ELEMENTS.
INCREASED NORMAL to LOW DECREASED AT RANDOM RECOVERY TOO
HIGH
CHECK FLOWS AND
PRESSURES AGAINST
DESIGN GUIDELINES.
REDUCE RECOVERY RATE.
CALIBRATE AND/OR ADD
SENSORS.
SYMPTOMS
TABLE 5: REVERSE OSMOSIS TROUBLESHOOTING
LOCATION
POSSIBLE
CAUSES
VERIFICATION CORRECTIVE ACTION
EPRO 150-8000 O&M MANUAL Rev.04/03 Page 37 of 55