ASTM D7601-2019 pdf free download
ASTM D7601-2019 pdf free download.Standard Practice for Pressure Driven Membrane Separation Element/Bundle Evaluation
1. Scope
1.1 This practice covers the inspection, performance testing, autopsy, and analytical work associated with evaluating pres- sure driven membrane separation elements (microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO)). 1.2 This practice is applicable for elements when newly manufactured or at any time during their operation in a water treatment facility. The Analytical section (6.4) covers only membrane surface and foulant analyses. 1.3 The data derived from these tests should be evaluated versus newly manufactured elements/bundles or against oper- ating systems when they were initially brought on-stream, or both. Industry norms can also be used for comparative pur- poses. 1.4 The values stated in inch-pound units are to be regarded as standard. No other units ofmeasurement 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Practice
4.1 This practice discusses the inspection of the pressure driven membrane separation elements required for individual units to be readied for a visual inspection or an autopsy that can be performed to ascertain structural integrity (Practice D6908) and cleanliness. Visual inspection is non-destructive testing; autopsy requires the dismantlement of the element. 4.2 Performance testing ofan element are discussed that can be accomplished on or off line, in a single or multi-element housing under conditions proscribed by the user or element manufacturer or Test Methods D4194. The data collected (Guides D4472 and D7285) must then be normalized (Practices D4516 and D5090) to a set of conditions that permit the element’s performance to be compared to an as-new unit. 4.3 Laboratory analyses are presented that include visual, usually non-destructive, as well as specialized instrumentation, usually destructive testing.
5. Significance and Use
5.1 Water treatment membrane devices can be used to produce potable water from brackish supplies and seawater as well as to upgrade the quality ofindustrial water. This standard permits the evaluation of the integrity and performance of membrane elements using visual observations and standard sets of conditions and are for short-term testing (<24 h). This standard can be used to determine changes that may have occurred in the operating characteristics ofelements but are not intended to be used for plant design.
6. Tests
6.1 Physical Inspection: 6.1.1 Spiral Wound Elements: 6.1.1.1 Disconnect element housing from the operating system and remove element to be inspected from housing, placing it on a work table. 6.1.1.2 Examine the element for cracked or dislodged, or both, end caps, telescoping, discolored scrolls, fiberglass dis- coloration and cracks, contaminants on fiberglass surface and in product tube, and any other abnormalities. 6.1.1.3 Weigh element and compare to the nominal as-new unit weight supplied by the manufacturer. 6.1.1.4 Record findings. 6.1.1.5 If element is to be reinserted into operating system or other flow tests are to be performed at a later time, visual testing should not be too long as to dry out the element. 6.1.2 Hollow Fiber Elements: 6.1.2.1 Visual Inspection: (1) Disconnect element from the operating system, placing it on a work table. (2) Examine the element for cracked nub or tube sheet, or both, telescoping, outer wrapping discoloration and cracks, contaminants on outer wrapping surface and in feed tube, and any other abnormalities. (3) Weigh element and compare to the nominal as-new unit weight supplied by the manufacturer. (4) Record findings.
