ASTM D3923-23 - 1.1.2023
 
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.

 
1. 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 ATube Sheet and O-Ring Leak Test for Hollow
Fiber Devices

8 to 9

Practice BVacuum Test for Spiral Wound Devices

10 to 12

Practice CDye Test for Spiral Wound and Tubular Devices

13 to 18

1.4?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5?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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 
2. Referenced Documents

D1193-24

Standard Specification for Reagent Water

D1129-24

Standard Terminology Relating to Water

E275-08(2022)

Standard Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers

D6908-25

Standard Practice for Integrity Testing of Water Filtration Membrane Systems

D4194-23

Standard Test Methods for Operating Characteristics of Reverse Osmosis and Nanofiltration Devices

E60-11(2022)e1

Standard Practice for Analysis of Metals, Ores, and Related Materials by Spectrophotometry (Includes all amendments and changes 6/29/2022).

D6161-19

Standard Terminology Used for Microfiltration, Ultrafiltration, Nanofiltration, and Reverse Osmosis Membrane Processes