ASTM-D3923 › Historical Revision Information
Standard Practices for Detecting Leaks in Reverse Osmosis and Nanofiltration Devices
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Scope
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:
|
| Sections |
| Practice A—Tube Sheet and O-Ring Leak Test for Hollow | 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 |
1.4 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.
Significance and Use
5.1 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.
Keywords
dye test; leaks; nanofiltration; O-ring test; reverse osmosis; tubesheet leak test; vacuum test
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71.120.99 (Other equipment for the chemical industry)
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Document Number
ASTM-D3923-08(2014)
Revision Level
2008 R14 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
Feb. 15, 2014
Document Type
Practice
Page Count
3 pages
Committee Number
D19.08