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ASHRAE 126 08:2008 Edition

ASHRAE 126 08:2008 Edition

$21.13

ASHRAE Standard 126-2008 Method of Testing HVAC Air Ducts and Fittings (ANSI/ASHRAE/SMACNA Approved)

Published By Publication Date Number of Pages
ASHRAE 2008 22
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PDF Pages PDF Title
4 FOREWORD
FOREWORD
1. PURPOSE
1. PURPOSE
2. SCOPE
2. SCOPE
2.1 This standard may be used to determine the structural strength, dimensional stability, durability, and leakage characteristics of HVAC air ducts and fittings.
2.1 This standard may be used to determine the structural strength, dimensional stability, durability, and leakage characteristics of HVAC air ducts and fittings.
2.2 This standard does not cover:
2.2 This standard does not cover:
3. DEFINITIONS
3. DEFINITIONS
5 4. NOMENCLATURE
4. NOMENCLATURE
5. INSTRUMENTS
5. INSTRUMENTS
5.1 Accuracy and Precision. Measurements shall be made with an instrument or instrument system, including read-out devices, that meets the accuracy and precision requirements specified in Sections 5.2 through 5.5. The systematic error in an instrumen…
5.1 Accuracy and Precision. Measurements shall be made with an instrument or instrument system, including read-out devices, that meets the accuracy and precision requirements specified in Sections 5.2 through 5.5. The systematic error in an instrumen…
5.2 Temperature Measurement
5.2 Temperature Measurement
5.3 Pressure Measurement
5.3 Pressure Measurement
5.4 Flowmeters. Flowmeters shall have an accuracy of 2% (of reading).
5.4 Flowmeters. Flowmeters shall have an accuracy of 2% (of reading).
5.5 Dial Indicators. Dial indicators shall have jewel bearings, a suitable range, and 0.01 mm graduations.
5.5 Dial Indicators. Dial indicators shall have jewel bearings, a suitable range, and 0.01 mm graduations.
6. TESTS
6. TESTS
6.1 Tests to be conducted are listed below. A specific test specimen may be used for more than one test at the sponsor’s discretion.
6.1 Tests to be conducted are listed below. A specific test specimen may be used for more than one test at the sponsor’s discretion.
6.2 Individual tests may be omitted by the sponsor.
6.2 Individual tests may be omitted by the sponsor.
6.3 When required by the sponsor, a leakage test shall be conducted before and after an individual test. If a specific test specimen is to be used for a group of tests, a leakage test may be conducted before and after the test series. Exclusive leaka…
6.3 When required by the sponsor, a leakage test shall be conducted before and after an individual test. If a specific test specimen is to be used for a group of tests, a leakage test may be conducted before and after the test series. Exclusive leaka…
7. LEAKAGE TEST
7. LEAKAGE TEST
7.1 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.
7.1 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.
7.2 Test Setup
7.2 Test Setup
6 Figure 1 Generic leakage test setup.
Figure 1 Generic leakage test setup.
7.3 Test Procedure
7.3 Test Procedure
7.4 Leakage Rate Correction
7.4 Leakage Rate Correction
8. STRUCTURAL TESTS
8. STRUCTURAL TESTS
8.1 Deflection Under Pressure
8.1 Deflection Under Pressure
7 Figure 2a Deflection measurement locations for externally reinforced ducts (rectangular ducts).
Figure 2a Deflection measurement locations for externally reinforced ducts (rectangular ducts).
Figure 2b Deflection measurement locations for externally reinforced ducts (flat oval ducts).
Figure 2b Deflection measurement locations for externally reinforced ducts (flat oval ducts).
Figure 2c Deflection measurement locations for externally reinforced ducts (round ducts).
Figure 2c Deflection measurement locations for externally reinforced ducts (round ducts).
8 Figure 3 Deflection measurement locations for unreinforced ducts.
Figure 3 Deflection measurement locations for unreinforced ducts.
8.2 Deflection Under Superimposed Loads
8.2 Deflection Under Superimposed Loads
9 Figure 4 Test specimen loading.
Figure 4 Test specimen loading.
10 8.3 Impact Test
8.3 Impact Test
8.4 Tension Test
8.4 Tension Test
11 Figure 5 Sandbag details. Reproduced with permission of Underwriters Laboratories, Inc.4
Figure 5 Sandbag details. Reproduced with permission of Underwriters Laboratories, Inc.4
8.5 Bending Test
8.5 Bending Test
12 Figure 6 Test specimen impact configurations and strike points.
Figure 6 Test specimen impact configurations and strike points.
Figure 7 Tension test setup.
Figure 7 Tension test setup.
Figure 8 Bend test setup.
Figure 8 Bend test setup.
8.6 Pressure Cycling Test
8.6 Pressure Cycling Test
13 8.7 Burst/Collapse Test
8.7 Burst/Collapse Test
8.8 Puncture Test
8.8 Puncture Test
14 Figure 9 Puncture test apparatus.
Figure 9 Puncture test apparatus.
9. DURABILITY TESTS
9. DURABILITY TESTS
9.1 General. The temperature and relative humidity tests shall be conducted sequentially using the same specimen.
9.1 General. The temperature and relative humidity tests shall be conducted sequentially using the same specimen.
9.2 Temperature Test
9.2 Temperature Test
15 Figure 10 Puncture test specimen strike-point locations.
Figure 10 Puncture test specimen strike-point locations.
9.3 Humidity Test
9.3 Humidity Test
16 10. REPORT
10. REPORT
11. REFERENCES
11. REFERENCES
informative APPENDIX A— COMMENTARY
informative APPENDIX A— COMMENTARY
informative APPENDIX B— LEAKAGE TEST SETUPS AND EXAMPLE PROBLEM
informative APPENDIX B— LEAKAGE TEST SETUPS AND EXAMPLE PROBLEM
B1. LEAKAGE TEST SETUPS
B1. LEAKAGE TEST SETUPS
B1.1 Laminar Flow Test SetupB-1
B1.1 Laminar Flow Test SetupB-1
B1.2 Orifice Tube Test Setup
B1.2 Orifice Tube Test Setup
17 Figure B-1 Example of leakage measurement by a laminar flow system for positive pressure tests.
Figure B-1 Example of leakage measurement by a laminar flow system for positive pressure tests.
Figure B-2 Example of leakage measurement by a laminar flow system for negative pressure tests.
Figure B-2 Example of leakage measurement by a laminar flow system for negative pressure tests.
18 Figure B-3 Example of leakage measurement by an orifice tube system for positive pressure tests.
Figure B-3 Example of leakage measurement by an orifice tube system for positive pressure tests.
B2. Example Problem
B2. Example Problem
B2.1 Recorded Test Data
B2.1 Recorded Test Data
B2.2 Atmospheric Air Density Calculation
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:
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:
B3. REFERENCES for APPENDIX B
B3. REFERENCES for APPENDIX B
B4. BIBLIOGRAPHY for APPENDIX B
B4. BIBLIOGRAPHY for APPENDIX B
informative APPENDIX C— RECOMMENDED ACCEPTANCE CRITERIA
informative APPENDIX C— RECOMMENDED ACCEPTANCE CRITERIA
19 C1. Deflection under pressure (8.1)
C1. Deflection under pressure (8.1)
C2. Deflection under Superimposed Loads (8.2)
C2. Deflection under Superimposed Loads (8.2)
C3. Impact (8.3)
C3. Impact (8.3)
C4. Tension (8.4)
C4. Tension (8.4)
C5. Bending (8.5)
C5. Bending (8.5)
C6. Pressure Cycling (8.6)
C6. Pressure Cycling (8.6)
C7. Burst/Collapse (8.7)
C7. Burst/Collapse (8.7)
C8. Puncture (8.8)
C8. Puncture (8.8)
C9. Temperature (9.2)
C9. Temperature (9.2)
C10. Humidity (9.3)
C10. Humidity (9.3)
informative APPENDIX D— BIBLIOGRAPHY
informative APPENDIX D— BIBLIOGRAPHY

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