flow measurment engineering product guide

Flow Measurement Engineering Products Guide

CAT.No.CIA020-1

/ Orifice Plate

2

ISO 9001 2000

D-D/2

1.

2.

3.

4.

5.

Orice plates that ensure stable ow measurement at all times have been widely used in many elds. Although the pressure loss increases, they have such merits as low cost, easy installation/ replacement, and high reliability. Orice plates are classied into the concentric, eccentric, segmental, quadrant, and rectangular types. Flange, corners, D-D/2, and vena contract taps are used to take out the dierential pressure.

1. Concentric Orice PlateThis is the orice plate that a bore is concentric with the pipe center line and upstream square and sharp. An uncertainty is smaller than other type of orice plates for a ow rate which has a high. Reynolds number a concentric square edged orice plate is suitable for the ow measurement of the large diameter pipe.

2. Eccentric Orice PlateThis is the orice plate a bore is internally tangential to the bottom of pipe bore. It is eective for the ow measurement when the uid being mattered carries a considerable amount of sediment or material in suspension.

3. Segmental Orice PlateThe bore of this orice plate is a segment of a circle of approximately the same Demeter as the internal pipe. It s functions are similar to those of the eccentric orice plate.

4. Quarter Circle Orice PlateThe inlet edge of the bore of this orice plate is rounded o to the form of a quarter circle. This orice plate is principally used for measuring ow rates of low Reynolds Numbers.

5. Square Orice PlateThe square orice plate is used for square pipings. Its functions are similar to those of the concentric square edged orice plate.

/ Orifice Flange Assembly

3

ISO 9001 2000

25.4mm

FFRF

RTJ

The orice ange assembly is made by combining an orice plate and

anges with pressure taps, bolts and nuts, and gaskets. The anges are

equipped with pressure taps. The axes of the tappings are 25.4mm

from the upstream and downstream faces of the plate. The shape of

the gasket seat is classied into the at face (FF), raised face (RF), and

ring type joint (RTJ).

RTJ

Holder Ring Assembly

Ring joint (RTJ) ange has been produced for holder ring

assemblies. Holder ring assembly is assembled an orice

plate into a holder ring. The holder ring supports an orice

plate, and it prevents leakage of the uid.

RF WN RF Type

RTJ WN RTJ Type

/ Orifice Ring Assembly

4

ISO 9001 2000

The orice ring assembly consists of an orice plate, ring with pressure taps, and

gaskets.

Orice ring assemblies are suitable for ow measurement of smaller and

medium pipe size at lower pressure. Each assembly consists of one piece of

orice plate and one set of orice ring, and gasket. Corner tappings are used.

Types of pressure tapping connections of orice ring.

Types of Pressure Tapping Connections of Orifice Ring

/ Orifice Block

5

ISO 9001 2000

An orice block is one of the ow element which is integrated with orice plate and pressure tapping part. It is suitable for high temperature, high pressure and leaky uids. Corner and ange tappings are used.

Types of Pressure Tapping Connections of Orifice Block

/ Flow NozzleISO 9001 2000

6

60

In comparison with orice plates, the ow nozzle is strong and it allows

the ow rate more than that of the same sized orice.

Therefore, it is suitable for measurement of high-temperature

high-pressure uid. It can measure uid containing a slight amount of

solids with less diculty than orice plates.

Types of the installation are weld in, knock pin and anged type.

Weld in Type Flow Nozzle

Knock Pin Type Flow Nozzle

Flange Type Flow Nozzle

/ Venturi Tube

7

ISO 9001 2000

In comparison with orice plates and ow nozzles, the venturi tube is

expensive, because it is large and it has a complicated structure.

However, it has many merits such as the extremely small pressure loss,

less tendency of sludge and sediment deposition, high durability, and a

short straight tube that is necessary.

Venturi tube has the classical venturi tube and the venturi nozzle.

Classical venturi tube with a machined convergent and with a

rough-welded sheet-iron convergent are used commonly.

Venturi Tube with a Machined Convergent Section (Flanged End)

Venturi Tube with a Rough-Welded Sheet-Iron Convergent Section (Butt Weld)

Venturi Tube with a Rough-Welded Sheet-Iron Convergent Section (Flanged End)

/ Orifice Meter Run

8

ISO 9001 2000

1 JIS Z 8762, ISO 5167, ASME MFC-3M 2 ASME MFC-14M3 AGA, Report No.3

The orice meter run designed with orice plate, orice ange and ow conditioner if necessary. The pipe internal surface is bored and honed to obtain precise ow measurements if required. The orice meter run is designed in accordance with following standards. We can possible to deliver after calibration test using water or natural gas.

Applicable standard1. JIS Z 8762, ISO5167, ASME MFC 3MOrice meter run which used a standard concentric square edged orice plate2. ASME MFC-14MOrice meter run which was specialized in a small diameter3. AGA, Report No.3Orice meter run which was specialized in natural gas

Orifice Meter Run (Flanged End)

Orifice Meter Run (Butt Weld)

Orifice Meter Run (AGA Report No.3 )

/ Throat Tap Nozzle Pipe Assembly

9

ISO 9001 2000

ASME PTC-6

Throat tap nozzle pipe assembly consists of throat tap nozzle upstream

and downstream pipe and ow conditioner plate and design and

fabricate base on ASME PTC-6 test. The pipe internal surface is bored

and honed to obtain precise ow measurements the device which

used for the performance test of the stream turbine. We can possible to

deliver after calibration test using water.

ASME PTC-6

ASME PTC-6

/ Non Tap Venturi Tube

10

ISO 9001 2000

It is suitable when the uid being metered carries a considerable

amount of sediment or material in suspension, and corrosive uid with

low pressure loss. It is suitable for ow measurement of the liquid

which vaporizes when the temperature raises, and liquid and gas

which solidies when the temperature falls.

To use anged type pressure tappings and a transmitter with a

diaphragm prevents blockage of the pressure tappings. And it is low

pressure loss.

Wedge ow element is similar to a segment orice in that particular

matter or entrained gooses easily pass through the element. It is

possible to measure ow late for a ow rate in the low Reynolds

number. The pressure loss is small. It is suitable for bi-directional ow.

Non Tap Ventuty Tube

Wedge Flow Element

/ Others

11

ISO 9001 2000

This is use for pressure interception at the time of pressure test and

closedown of the plumbing. Spectacle blind that is united with blind

and Spacer.

Spectacle Blind, Blind and Spacer

Pitot Tube

/

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OVAL ASIA PACIFIC Pte. Ltd. 27 Kian Teck Drive, Jurong, Singapore 628844Tel. 65-6266-1178 Fax. [email protected]

OVAL Engineering Incorporated 295 Osan-ri,Dongtan-myon, Hwaseong City, Gyeonggi Province 445-813, Republic of KoreaTel. 82-31-379-3023 Fax. [email protected]

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flow measurment engineering product guide

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