ASME N509 pdf free download

ASME N509-2002 pdf free download.NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS.
This Standard covers requirements for the design, construction, and qualification and acceptance testing of the air-cleaning units and components which make up Engineered Safety Feature (ESF) and other high effi- ciency air and gas treatment systems used in nuclear power plants.
1.1 Limitations The Standard does not cover sizing of a complete nuclear air treatment system, redundancy, or single-fail- ure requirements. It applies only to systems which employ particulate filtration, ambient-temperature adsorption, or both, as the principal functional mecha- nism. It does not apply to condenser off-gas systems. Also, it does not apply to other applications that employ primarily gas storage or holdup, cryogenic adsorption or fractionation, or solvent absorption as the principal method of gas treatment. Nor does the Standard cover requirements for containment isolation valves, recom- biners, comfort heating, air-conditioning, or ventilation to achieve ordinary cooling or indutrial hygiene objec- tives. Field acceptance testing of nuclear air-treatment systems is covered in ASME AG-1, Section TA (the pri- mary reference was to ASME N510-1989).
1.2 Purpose The Standard identifies and establishes requirements for filters, adsorbers, moisture separators, air heaters, filter housings, dampers, valves, fans, ducts, and other components of nuclear air-treatment systems for a spe- cific application in a nuclear power plant. The Standard also establishes requirements for operability, maintain- ability, and testability of systems necessary for the main- tenance of system reliability for the design conditions. Qualification and acceptance testing provisions are spec- ified to verify the adequacy of the air-cleaning unit and component design, to verify that components have been properly fabricated and installed, and that the system will perform in accordance with specification require- ments.
2.APPLICABLE DOCUMENTS The following documents supplement this Standard and are a part of it to the extent indicated in the text. The issue of the referenced document noted below shall be in effect. If no date is listed, then the issue of the referenced document in effect at the time of the Purchase Order shall apply.
ASME AG-1, Code on Nuclear Air and Gas Treatment’ Publisher: The American Society of Mechanical Engi- neers (ASME International), Three Park Avenue, New York, NY 10016; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300
3 TERMS AND DEFINITIONS Terms and Definitions are located in ASME AG-1, Article AA-1000 and various specific ASME AG-1 Code sections.
4 FUNCTIONAL DESIGN
4.1 General Depending on the function of the system and the conditions under which it will operate, air-cleaning units include some or all of the following internal components. (a) Prefilters are required in air-cleaning units when design inlet particulate concentrations and particle size are such that the HEPA filter may be rendered ineffective prematurely. On other air-cleaning units prefilters are recommended only when it is desired to increase HEPA filter life. (b) HEPA filters are required in all air-cleaning units when filtration of inlet particulate matter requires a min- imum efficiency of 99.97% for particles equal to 0.3 micrometer in size. (C) Adsorbers are required when air-cleaning units are designed for removal of adsorbable compounds. (d) Moisture separators (demisters) are required when entrained water droplet concentration may be greater than 1 lb (0.45 kg) of water per 1,000 cfm (1,700 m’ /hr) of airflow. (e) Heaters should be utilized for air-cleaning units with adsorbers when the relative humidity of air to the adsorber exceeds 70% based upon the 1% percentile meteorological conditions (where applicable). For nuclear air-treatment systems which are unaffected by outside air meteorological conditions, heaters should be utilized when an accident would result in an airstream exceeding 70% relative humidity for more than 1 hr.ASME N509 pdf download.