News ISO 5167 v2022 standard

News ISO 5167 v2022 standard

Explanations on main evolutions of ISO 5167 2022 version compared to previous versions 

Which parameters have been adjusted ? How to find the correct information ? You will find answers and explanations here.

ISO 5167-1 - general principles

  • Additon of section 5 : ISO5167-5 cone meter
  • Addition of section 6 : ISO5167-6 wedge meter
  • Explanations of the mounting of several pressure transmitters with interconnections
  • Addition of an annex concerning the turndown ratio : turn-down ratio up to 1:42 with connection of 3 differential pressure transmitters - with examples and details in the standard
  • Addition of an annex concerning calculation details of measurement uncertainty 
  • Addition of an annex concerning permament pressure drop details for primary elements - with examples

ISO 5167-2 - orifice plates

  • Rewording for fittings concerning ustream straight lengths requirements

  • Minor modifications for space rules for multiple fittings

  • Description of calibration (for orifice plates out of the scope of the standard)

ISO 5167-3 - nozzles and venturi-nozzles

  • Minor modifications for harmonization with other parts of the standard

ISO 5167-4 - venturis

  • Individual pressure taps allowed (no obligation of annular chamber or "triple T" connection) 
  • Machined venturi reynolds number ReD no longer upper limited : adjusted discharge coefficient for ReD > 106  (C=1 for ReD > 10and C=0.995 for ReD < 106)

  • Cylindricality upstream of the pressure taps on a length of 2,5.D (compared to 2D)
  • Description of calibration (for venturi tubes out of the scope of the standard)

ISO 5167-5 - cone meters

  • Modifications of the cone main angles

ISO 5167-6 - wedge meters

  • Addition of an annex on the kd2 parameter linked to the discharge coefficient
  • Details on the uncertainty on discharge coefficient
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