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:
Accuracy Typically ±3% of actual flow (equivalent to ±1.5% full scale deflection at 50% of rated maximum flow)
Repeatability Typically ±0.3%
Turndown 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.
(1”, 1½”, 2”, 2½”, 3”, 4”, 5”, 6”, 8”, 10”, 12”, 14”, 16”, 18”, 20” and 24”)
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 | BS 1449 S 316 (Stainless Steel Grade 316) |
Carrier | Passivated zinc plated carbon steel |
Gaskets | Exfoliated graphite |
Pressure tappings
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 ½” NPT.
These tappings are 25.4 mm either side of the orifice plate face in line with the requirements of BS 1042 /ISO 5167.