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Title: Ageing Effects On Orifice Metering
Author: Michael Reader-Harris
Source: 2003 North Sea Flow Measurement Workshop
Year Published: 2003
Abstract: Orifice plate flowmeters are affected by upstream installation. This paper describes the effect of some changes to the installation which occur with time after the orifice plate is installed. Orifice plates require a significant upstream straight length of pipework, and one way of reducing the required upstream straight length is to use a flow conditioner. Although the former ISO 5167-1:1991 1 did not encourage the use of flow conditioners to a great extent, the new version does: see ISO 5167-1: 2003 2 and ISO 5167-2: 2003 3. However, the sharp edges of a perforated plate flow conditioner may become rounded or a perforated plate flow conditioner may with time become partially blocked. Whereas orifice plates are regularly checked in service, flow conditioners are much less frequently checked. Therefore the first set of tests assessed the effects of rounding the upstream edge of a Zanker Flow Conditioner Plate and of blocking a row of holes in the plate. The Zanker Flow Conditioner Plate was chosen as it is not patented and of the unpatented conditioners included in ISO 5167-2: 2003 it gives the shortest upstream lengths.

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