Tiêu đề ISO 10780-1994 - NSC 26-TC 8-WG 4.pdf ✅

ISO 10780:1994(E) Contents Page 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 Definitions and symbols ............................................................ 1 4 Principle ..................................................................................... 1 5 Apparatus ............................. .......................... ........................... 2 6 Environmental requirements .............................. ....................... 8 7 Test procedure ................................. ......................................... 9 8 Calculation of velocity and volume flowrate . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9 Accuracy .................................................................................. 15 10 Test report .............................................................. ............... 15 Annexes A Maintenance of Pitot tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 B Determination of duct static pressure with Pitot tubes ........ 17 C Determination of flow direction with Pitot tubes .................. 18 D Correction of swirling flow .................................................... 19 0 ISO 1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland ii Licensed to NSC 26/TC 8/WG 4. For reference use only; Date 12/9/2024. Single user licence only, copying and networking prohibited.

ISO 10780:1994(E) Q ISO Introduction ISO/TC 146/SC 1 prepares International Standards for the determination of concentrations of pollutants in stationary Source emissions. For the calculation of the emission rate, the volume flow of a gas stream has to be measured. This International Standard specifies methods for the de- termination of the velocity and the volume flowrate of gas streams in ducts and chimneys. lt is based largely on ISO 3966:1977, ISO 4006:1977 and ISO 9096:1990. ISO 3966 and ISO 4006 specify methods for mea- suring the flow of process streams in closed conduits using type L Pitot static tubes. ISO 9096 specifies ways to measure velocity and mass flow when sampling for particles in gas streams in ducts and chimneys. This International Standard differs from ISO 3966 and ISO 4006 in allowing the use of the type S Pitot tube (a device not mentioned in ISO 3966) as well as the type L. lt differs from ISO 9096 in that it provides considerably more information concerning the construction and use of the Pitot tubes commonly used to measure the velocity and volume flowrate of gas streams in ducts and chimneys. Licensed to NSC 26/TC 8/WG 4. For reference use only; Date 12/9/2024. Single user licence only, copying and networking prohibited.