3.4.1

Flowmetering

Orifice plate flowmeters

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification without notice.

© Copyright 2014

TI-P176-02

MI Issue 5

M410

Orifice Plate Flowmeter

and Carrier Assembly

Description

The M410 orifice plate and carrier assembly is a primary flow element

consisting of a tab handled square edged orifice plate and optional

carrier. The orifice plate is designed and manufactured to meet the

requirements of British Standard BS 1042 and International Standard

Organisation ISO 5167 in all respects and is suitable for the

measurement of the rate of flow for most liquids, gases and steam.

The tab handled orifice plate can be used for either:

a: on its own fitted between flanges with pressure tappings in the

users pipework or flanges.

or

b: fitted into a carrier with integral flange tappings designed to fit

between customer flanges.

Limiting conditions

The pressure and temperature limitations of both the tab handled plate

and the carrier assembly are the same as the specified flange ratings.

Performance

To BS 1042 and ISO 5167.

The performance of an orifice plate flowmetering system can be

greatly influenced by installation variables, so the figures given below

are for guidance only:

M410 orifice plate

Accuracy

Repeatability

Turndown

Typically ±3% of actual flow

(equivalent to ±1.5% full scale deflection at 50%

of rated maximum flow)

Typically ±0.3%

Typically 4:1

Pipe sizes available

Tab handled plates with or without carriers are available to suit the

following pipe sizes:

DN25, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200,

DN250, DN300, DN350, DN400, DN450, DN500 and DN600.

Connections

Tab handled plates and carriers are available to suit the following

flange specifications:

EN 1092 PN16, PN25 and PN40.

BS 10 Table H.

ASME B 16.5 Class 150, 300, 600.

Japanese Industrial Standard JIS 20.

Korean Standard KS 20.

Materials

Tab handled orifice plate

Carrier

Gaskets

Pressure tappings

BS 1449 S 316

Passivated zinc plated carbon steel

Exfoliated graphite

When the tab handled orifice plates are used without the optional

carrier, it is the responsibility of the user to provide appropriate

presssure tappings in either his flanges or upstream and downstream

pipework in line with BS 1042 / ISO 5167.

The optional carrier assembly incorporates upstream and downstream

pressure tappings threaded 1⁄2" NPT. These tappings are 25.4 mm

either side of the orifice plate face in line with the requirements of BS

1042 / ISO 5167.

M410 orifice plate

and carrier assembly