ASME N511:2007 pdf free download

ASME N511:2007 pdf free download.In-Service Testing of Nuclear Air Treatment, Heating, Ventilating, and Air-Conditioning Systems.
ASME N511 covers the requirements for in-service testing of nuclear safety-related air treatment, heating, ventilating, and air-conditioning systems in nuclear facilities.
1.2 Purpose
The purpose of this Standard is to provide requirements for in-service testing, the results of which are used to verify that the nuclear air treatment, heating. ventilating, and air-conditioning systems perform their intended function.
1.3 Applicability
This Standard applies to the in-service testing of nuclear air treatment, heating, ventilating, and air-conditioning systems that have been designed, built, and acceptance tested in accordance with ASME AG-i. Sections of this Standard may be used for technical guidance when testing air treatment, heating, ventilating, and air-conditioning systems designed and built to other standards.
1.4 Use of This Standard
This Standard provides a basis for the development of test programs and does not include acceptance criteria, except where the results of one test influence the performance of other tests. Based on the system design and its function(s), the owner shall develop a test program and acceptance criteria.
Nonmandatory Appendices A through C provide additional information and guidance.
1.5 Definitions
The definitions provided in this section supplement those listed in ASMI AC-I, Article AA-1(XX).
abnormal incident: any event or condition that may adversely affect the function of the nuclear air treatment, heating, ventilating, and air-conditioning systems.
acceptance test: a test made upon completion of fabrication, installation, repair, or modification of a unit, component, or part to verify to the user or owner that the item meets specified requirements.
Il-i GENERAL
This procedure is used to test the leak tightness of the ducts and housings, including installed fan housings, damper housings, and fan and damper shaft seals.
11-2 SUMMARY OF METHOD
Ducts and housings that form the pressure boundary of the system shall be leak tested with air using one of the methods listed in this procedure. Either method may be used and will produce a similar test result. The constant pressure method is useful for testing small volumes and is conducted at the maximum operating pressure for the system. The pressure decay method is useful in testing large volumes and is conducted by pressurizing to 1.25 times the maximum operating pressure, then allowing the pressure to decay for a fixed period of time or until the pressure decreases to 75°/n of the maximum operating pressure, whichever occurs first. Fans, dampers, and other components that are part of the pressure boundary shall be installed and tested with the pressure boundary to verify interface connection leak tightness. If the measured leak rate is in excess of the acceptance criteria, the leaks shall be located by one of the methods listed in this procedure. After leaks are repaired, the duct and housing shall be retested to verify leak tightness.
NOTE: This test procedure is written as if the operating pressure were pesitive, but it would be identical For negative pressure svstems with appropriate change in signs used in the data collection and calculations.
11-3 PREREQUISITES
Construction, modifications, and repairs affecting the test boundary shall be complete and the inlet and discharge openings of the duct or housing sealed before the test is started. All electrical, piping, and instrument connections shall be complete, and all permanent seals shall be installed before the test is started. For pressure decay testing, the volume of the pressure test boundary must be determined.
11-4 TEST EQUIPMENT
(a) pressuriiation source (pneumatic, test fan with flow control, etc.)
(b) covers to seal test boundaries
(c) clock or timer
(e) Start the pressurization source and operate it until the maximum operating pressure is achieved. Maintain pressure constant with the flow control device until temperature remains constant within +0.59F (0.25°C) for a minimum of 10 min. Record the initial stabilized pressure, temperature, and barometric pressure.