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ASTM International , 01/01/2014
Publisher: ASTM
File Format: PDF
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1.1These practices cover detecting leaks in which there is a direct communication between the feed or concentrate, or both, and the permeate. Several types of leaks are possible with the various configurations of reverse-osmosis (RO) and nanofiltration (NF) devices.
1.2Types of Leaks:
1.2.1With hollow-fiber devices, feed or concentrate leakage, or both, into the permeate stream by leaks through the tube sheet and past the tube sheet O-ring are possible. “Leaks” caused by broken fibers are not covered by these practices.
1.2.2With spiral-wound devices, leaks may occur through damage of the membrane surface itself by punctures or scratches, by glue-line failure, and by O-ring leaks on product tube interconnectors.
1.2.3With tubular devices, leaks due to membrane damage, tube end seal leaks, and leaks from broken tubes or product headers are possible.
1.3Three leak test practices are given as follows:
Sections
Practice A-Tube Sheet and O-Ring Leak Test for Hollow Fiber Devices
8 to 9
Practice B-Vacuum Test for Spiral Wound Devices
10 to 12
Practice C-Dye Test for Spiral Wound and Tubular Devices
13 to 18
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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