BS 4979:1986
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Methods for aerodynamic testing of constant and variable dual or single duct boxes, single duct units and induction boxes for air distribution systems
Hardcopy , PDF
12-01-2003
English
04-30-1986
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Foreword
Committees responsible
Specification
1. Scope
2. Definitions
3. Summary of tests
4. Symbols and suffixes
5. Instrumentation
6. Leakage tests
7. Test for flow rate control
8. Boxes with variable rate of air flow at constant
inlet pressure
9. Test for flow rate characteristics of single duct
units
10. Test for temperature mixing efficiency of dual
duct boxes
11. Tests for induction boxes
Tables
1. Symbols
2. Ranges and accuracies of measurement of air flow
meters not employed for determining leakage rate
3. Ranges and accuracies of measurement of air flow
meters for determining leakage rate
4. Pressure measuring instruments: range, accuracy
and scale intervals
5. Pressure differentials
Figures
1. Leakage test, air supply duct
2. Typical air supply arrangement for tests on single
duct boxes and/or units
3. Typical air supply arrangement for tests on dual
duct boxes
4. Examples of the determination of 'minimum pressure
differential'
5. Typical graph resulting from tests described in 8.4
6. Typical graph for tests on a single duct unit
7. Typical air supply arrangement for mixing efficiency
tests showing location of instrumentation
8. Mixing efficiency: typical outlet duct arrangement
(single outlet)
9. Mixing efficiency: points of temperature measurement
in outlet extension duct of multiple outlet box
10. Typical induction box test installation
Methods of test for casing leakage, valve and damper leakage, flow rate control, temperature mixing, induction flow rate and pressure requirements.
| Committee |
RHE/2
|
| DocumentType |
Standard
|
| Pages |
26
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
| Supersedes |
| Standards | Relationship |
| ISO 5220:1981 | Similar to |
| BS 1042-1.1(1981) : 1981 | MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - SPECIFICATION FOR SQUARE-EDGED ORIFICE PLATES, NOZZLES AND VENTURI TUBES INSERTED IN CIRCULAR CROSS SECTION CONDUITS RUNNING FULL |
| BS 1042-2.1:1983 | Measurement of fluid flow in closed conduits. Velocity area methods Method using Pitot static tubes |
| BS 1042-1.2(1984) : LATEST | SPEC. FOR SQUARE-EDGED ORIFICE PLATES, NOZZLES (WITH DRAIN HOLES, IN PIPES BELOW 50MM DIAMETER, AS INLET AND OUTLET DEVICES) AND OTHER ORIFICE PLATES AND BORDA INLETS |
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