Tiêu chuẩn quốc tế
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Số hiệu
Standard Number
ASTM D3923-08
Năm ban hành 2008
Publication date
Tình trạng
W - Hết hiệu lực
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Tên tiếng Anh
Title in English Standard Practices for Detecting Leaks in Reverse Osmosis and Nanofiltration Devices
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Chỉ số phân loại Quốc tế (ICS)
By field |
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Số trang
Page 3
Giá:
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Phạm vi áp dụng
Scope of standard 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: SectionsPractice A-Tube Sheet and O-Ring Leak Test for Hollow Fiber Devices 8 to 9Practice B-Vacuum Test for Spiral Wound Devices10 to 12Practice C-Dye Test for Spiral Wound and Tubular Devices13 to 181.4 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.
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