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Multi-bore orifice plates

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viceotvorove_01Except for all advantages of centric orifice plates (such as simplicity, replaceability, reliability), multi-bore orifice plates have lower built-in lengths enabling wider possibilities of their use.

Design of multi-bore orifice plate enables using of straight lengths in front of and behind orifice plate in length of 2D or max. 3D in dependency on b coefficient (D symbol indicates inside diameter of piping). There is a similarity with centric orifice plates, however, in the plate there are more bores.
Flow of measured medium through several narrowed diameters make lower demands on minimal straight lengths of piping in front of and behind the plate which are essential for proper functioning of these meters. Use of multi-bore orifice plates is limited only by bcoefficient (b=d/D). Multi-bore orifice plates are ready for use as working meters without verification or as verified meters with meter tube included. These meters have its own pattern approvals which are in compliance with ISO 5167 and ISO TR 15377 standards.

Multi-bore orifice plate are manufactured for DN15-DN1000 inner diameters for a range of b coefficient limited by b=0,4 and b=0,65.

Multi-bore orifice plate with chamber tapings of pressure differential as working meter without verification

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Multi-bore orifice plate with chamber tapings (as working meter without verification) is manufactured in range of nominal inner diameters DN15-DN1000. Its main part is made of two-part flange with annular chambers and a plate. Plate is clapped between two parts of flange and it is sealed by a seal. In the flanges there are outlets of differential pressure tappings. Plate is replaceable. Working position of flow meter can either be horizontal or vertical. Usual construction width of orifice plate with chamber taping is 60 mm.
For the production of flange used for multi-bore orifice plates we usually use 11 grade or 17 grade steel. Plate is manufactured of 17 grade steel. On request we can make plate or flanges of special materials such as nickel and titanium based alloys event. tantalum.
Multi-bore orifice plates as working meters without verification can also be delivered with ANSI B 16.36 pressure taping flanges.

Multi-bore orifice plate with individual tapings of pressure differential as working meter without verification

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Multi-bore orifice plate with individual tapings as working meter without verification is manufactured in range of nominal inner diameters DN 15-DN 1000. This type of orifice plate has one-piece flange and plate is placed directly in the orifice plate body. Individual tappings are made in front of and behind plate. Multi-bore orifice plate can be used in metering places with higher operational pressure nad temperature. Due to the fact that the orifice plate is unreplaceable, there is lower probability of leakage. Plate can not be replaced. Working position of the flow meter can either be horizontal or vertical. Usual construction width of orifice plates with individual tapings is 40 mm.
Multi-bore orifice plate with individual tapings is made of 15 or 17 grade steel. On request it can also be made of special nickel and titanium based alloys event. tantallum.

Multi-bore orifice plate with verification

Verified multi-bore orifice plate is manufactured in design of meter tubes containing not only built-in orifice plate (flange joint incl. distance bolts) but also straightening section of piping in front of and behind orifice plate ensuring supply of stabilised fluid flow. Meter tube is manufactured for all nominal inside diameters with corner pressure tapings in the flange.

Meter tubes are manufactured in the range of nominal inside diameters DN15-DN1000.

Working position of the flow meter can either be horizontal or vertical. For the meter tube there can be used pattern approved readers (indicators) of differential pressure, pressure reader, thermometers and evaluation units.

For production of meter tubes we usually use 11 grade steel. It can also be made of 15 and 17 grade steel as well as of plastic. Plate is usually made of 17 grade steel. Plate is carefully centred between taping flanges by simple construction placing.

Diagram of plates

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Plate for DN15-DN200 meter tube

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Plate for DN250 – DN1000 meter tube
Diagram of meter tubes with multi-bore orifice plate

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Diagram of DN15-DN200 meter tube
 Diagram of DN250-DN1000 meter tube

 

Multi-bore orifice plate with chamber tapings of pressure differential as working meter without verification

Nominal inside
diameter and
nominal pressure
of meter tubes		 Outside
diameter
of piping
(mm)		 Thickness
of piping
(mm)		 Inside
diameter
of piping
(mm)		 Outside
diameter
of flange
(mm)		 Weight
of meter
tube
(kg)		 Approximate
construction
length of meter
tube approx. (m)
DN 15 PN 40 21,3 2,6 16,1 95 3,2 0,11
DN 20 PN 40 26,9 2,6 21,7 105 4,5 0,14
DN 25 PN 40 33,7 2,6 28,5 115 5,1 0,16
DN 32 PN 40 42,4 2,6 37,2 140 7,1 0,20
DN 40 PN 40 48,3 2,6 43,1 150 9,1 0,23
DN 50 PN 40 60,3 2,9 54,5 165 17,9 0,28
DN 65 PN 40 76 3,2 69,6 185 25,1 0,34
DN 80 PN 40 89 3,6 81,8 200 29,8 0,40
DN 100 PN 40 114 4 106 235 43,6 0,50
DN 125 PN 40 140 4,5 131 270 61,8 0,60
DN 150 PN 40 168 5 158 300 70,2 0,72
DN 200 PN 40 219 6,3 206,4 375 128,5 0,93
DN 250 PN 16 273 7 259 405 95,7 0,67
DN 250 PN 40 273 7 259 450 191,4 0,74
DN 300 PN 16 324 8 308 460 102,9 0,78
DN 300 PN 40 324 8 308 515 258,2 0,86
DN 350-1000
PN 16-40		 Inside diameters of piping are
determined by discussion with customer