ASME N511 pdf download

ASME N511 pdf 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 ASME AG-i, Article AA-1fl(fl
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.
(d) pressure-indicating device
(e) flowmeter or totalizing gas volume meter (constant pressure method)
(f) temperature-indicating device
(g) bubble solution for detecting air leaks (bubble method)
(h) optional portable electronic sound detection equipment (audible leak method)
(i) barometer
11-5 PROCEDURE
11-6 CONSTANT PRESSURE TEST
(a) Connect the pressurization source to the duct or housing.
(b) Connect the flow meter or totalizing gas volume meter between the pressurization source and housing (downstream of the throttling valve, if used).
(c) Install temperature- and pressure-indicating devices so that they will indicate representative temperature and pressure inside the duct or housing being tested.
(d) Seal test boundaries and close access doors in the normal manner. Do not use temporary sealant, duct tape, or similar temporary materials except for sealing the temporary blank-off panels.
(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 ±0.5°F (0.25°C) for a minimum of 10 mm. Record the initial stabilized pressure, temperature, and barometric pressure.
(f) Measure the flow rate of the air being added to or removed from the duct or housing while maintaining the maximum operating pressure within ±0.1 in. wg 10.025 kPa (gage)]. When using the flow meter, record flow readings once a minute for a 5-mm continuous period, and average the readings to calculate the measured leak rate. When using a totalizing gas volume meter, measure the total volume of air for a 10-mm continuous period, and divide the measured volume by time (10 mm) to calculate the measured leak rate. Record final pressure, temperature, and barometric pressure.
(g) Convert the final calculated leak rate to standard cubic feet per minute (cubic meters per second) in accordance with the method illustrated in Industrial Ventilation (ACGIH) (see references in section 2).
11-8 ACCEPTANCE CRITERIA
Pressure boundary test results are acceptable when there are no leaks in excess of the limits specified in the applicable sections of ASME AG-I and the owner’s test program If the calculated leak rate exceeds the acceptance criteria specified in the owner’s test program, locate leaks in accordance with one of the techniques outlined in section 11-9 or 11-10.
11-9 BUBBLE LEAK LOCATION METHOD
(a) Pressurize the test boundary to the maximum operating pressure for the system.
(b) With the test boundary under continuous pressure, apply bubble solution to areas to be tested. Identify places where bubbles are found, and perform corrective actions.
(c) Following corrective actions, retest in accordance with section 11-6 or 11-7.