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ASTM D3923-08

ASTM D3923-08

Standard Practices for Detecting Leaks in Reverse Osmosis and Nanofiltration Devices

2014-02-19 /Historical
Superseeded by:
Significance and Use:

These practices may be used to determine whether a RO or NF device is free of leaks if the mechanical integrity of the device is to be confirmed. They may also be used to detect leaks in RO or NF devices whose operating performance indicates a possible leak. These practices may be used for either new or used devices.


1.1 These 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.

1.2 Types of Leaks:

1.2.1 With 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.

1.2.2 With 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.

1.2.3 With tubular devices, leaks due to membrane damage, tube end seal leaks, and leaks from broken tubes or product headers are possible.

1.3 Three leak test practices are given as follows:

Practice ATube Sheet and O-Ring Leak Test for Hollow
Fiber Devices
8 to 9
Practice BVacuum Test for Spiral Wound Devices10 to 12
Practice CDye Test for Spiral Wound and Tubular Devices13 to 18

1.4 This 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.

dye test; leaks; nanofiltration; O-ring test; reverse osmosis; tubesheet leak test; vacuum test; Dye leak test; Leak testing; O-rings; Reverse osmosis (RO) installations; Spider test; Tube sheet leak test; Vacuum leak test
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