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ASHRAE Standard 126 2020

ASHRAE Standard 126 2020

$38.46

ASHRAE / SMACNA Standard 126-2020 — Method of Testing HVAC Air Ducts (ANSI/SMACNA Approved)

Published By Publication Date Number of Pages
ASHRAE 2020 28
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Standard 126 provides laboratory test procedures for determining the structural strength, dimensional stability, durability, and leakage characteristics of HVAC air ducts. Changes in the 2020 revision include updated references.

PDF Catalog

PDF Pages PDF Title
1 ANSI/ASHRAE/SMACNA Standard 126-2020
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
2.1 This standard shall be used to determine the structural strength, dimensional stability, durability, and leakage characteristics of HVAC air ducts.
2.2 This standard does not address the following:
3. DEFINITIONS AND SYMBOLS
3.1 Definitions
5 3.2 Symbols
4. INSTRUMENTATION
4.1 Accuracy and Precision. Measurements from the instruments shall be traceable to primary or secondary standards calibrated by the National Institute of Standards and Technology (NIST) or to the Bureau International des Poids et Mesures (BIPM) if a…
6 4.2 Temperature
4.3 Pressure
4.4 Barometers. Barometers shall be calibrated to traceable standards per Section 4.1.
4.5 Flowmeters. Flowmeter shall be an orifice or laminar flowmeter.
4.6 Dial Indicators. Dial indicators shall have jewel bearings, a suitable range, and 0.01 mm graduations.
5. TESTS
5.1 Tests to be conducted are listed below. At the discretion of the sponsor, a specific test specimen for more than one test is permitted.
5.2 At the discretion of the sponsor, it is acceptable to omit individual tests.
5.3 When required by the sponsor, a leakage test shall be conducted before and after an individual test.
6. LEAKAGE TEST
7 6.1 Test Specimen and Test Pressure. The duct assembly and test pressure shall be specified by the sponsor. The ends of the duct assembly shall have sealed end caps.
6.2 Test Setup
6.3 Test Procedure
6.4 Leakage Rate Correction
7. STRUCTURAL TESTS
7.1 Deflection under Pressure
10 7.2 Deflection under Superimposed Loads
11 7.3 Impact Test
14 7.4 Tension Test
15 7.5 Bending Test
7.6 Pressure Cycling Test
16 7.7 Burst/Collapse Test
17 7.8 Puncture Test
19 8. DURABILITY TESTS
8.1 General. The temperature and relative humidity tests shall be conducted sequentially using the same specimen.
8.2 Temperature Test
8.3 Humidity Test
20 9. REPORT
10. REFERENCES
21 INFORMATIVE ANNEX A: COMMENTARY
22 INFORMATIVE ANNEX B: LEAKAGE TEST SETUPS AND EXAMPLE PROBLEM
B1. LEAKAGE TEST SETUPS
B1.1 Laminar Flow Test SetupB-1
B1.2 Orifice Tube Test Setup
B2. EXAMPLE PROBLEM
B2.1 Recorded Test Data
B2.2 Atmospheric Air Density Calculation
B2.3 The measured leakage rate (Qa) determined by a laminar flowmeter is 5.093 L/s at 0.750 kPa. The leakage rate referenced to standard air density is 4.86 L/s, calculated as follows:
23 B3. REFERENCES FOR ANNEX B
B4. BIBLIOGRAPHY FOR ANNEX B
25 INFORMATIVE ANNEX C: RECOMMENDED ACCEPTANCE CRITERIA
C1. DEFLECTION UNDER PRESSURE (7.1)
C2. DEFLECTION UNDER SUPERIMPOSED LOADS (7.2)
C3. IMPACT (7.3)
C4. TENSION (7.4)
C5. BENDING (7.5)
C6. PRESSURE CYCLING (7.6)
C7. BURST/COLLAPSE (7.7)
C8. PUNCTURE (7.8)
C9. TEMPERATURE (8.2)
C10. HUMIDITY (8.3)
26 INFORMATIVE ANNEX D: BIBLIOGRAPHY

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ASHRAE Standard 126 2020
$38.46