Polymex LP-8040

• Maximum Operating Temperature a -45°C
• Maximum Operating Pressure -600 psig 
• Maximum Element Pressure Drop -15 psig 
• pH Range, Continuous Operation a -3  – 10
• pH Range, Short-Term Cleaning (30 min.) b -2  – 11
• Maximum Feed Silt Density Index (SDI) -SDI 5
• Free Chlorine Tolerance c -< 0.1 ppm

Keep elements moist at all times after initial wetting.

• If operating limits and guidelines given in this bulletin are not strictly followed, the limited warranty will be null and void.
• To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
• The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.
• Maximum pressure drop across an entire pressure vessel (housing) is 50 psi.
• Avoid static permeate-side backpressure at all times.

Avoid any abrupt pressure or cross-flow variations on the spiral elements during  start-up, shutdown, cleaning or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended as follows:

• Feed pressure should be increased gradually over a 30-60 second time frame.
• Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.

Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved.

Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.