Orifice Plate
Model : HOP

Overview

Even though the orifice plate has a disadvantage of permitting a greater pressure loss than other differential pressure type flow meter such as flow nozzle and venturi tube, etc., the orifice plate is popularly used for flow measurement due to high reliability, low cost, easy manufacturing and simple shape. As for bore type of orifice plate, there are Concentric, Eccentric, Segmental and Quadrant Edged types, and sizing calculation and design for the orifice plate are based on the standard codes of ISO-5167, ASME MFC-3M within a tolerance in compliance with these ISO & ASME Standards.

Concentric Bore Type

Concentric bore type is a traditional and universal type with sharp edge, one side of the bore beveled with 45° angle and it also has a simple structure. This type of orifice plate can be easily mounted and dismounted. Pressure taps for differential pressure measurement can be considered among flange tap, radius tap, pipe tap, vena contracta tap and corner tap by its characteristic.

Eccentric Bore Type

Eccentric bore type is generally used to prevent stay of solid materials in the pipe line and it is useful to measure flow of fluids such as sediment, liquid containing solid, water mixed oil and wet steam. This orifice plate is used with its eccentric bore at the bottom of the pipe in order to prevent accumulation of sediment. Likewise, for gas or vapor, eccentric bore can be located at the top of the pipe to avoid stay of gas or vapor in the pipe. Eccentric orifice plate can be used with flange or vena contracta taps but these taps should be located at 180° or 90° to the eccentric opening.

Segmental Bore Type
Segmental bore type is generally used for the same service as the eccentric orifice plate. Segmental bore opening can be placed either at the top or bottom of the pipe. However, it is generally used in service which requires the bore at the bottom of the pipe. For the best accuracy, the tap should be located at 180˚ from the center of tangency.

Quadrant Edged Type
Quadrant edged type is specially designed for flow measurement of viscous fluids such as heavy crude oil, syrup and slurry that have a low Reynolds number, and the inlet of the bore is machined with rounded edge.

Concentric Bore Type	Eccentric Bore Type	Segmental Bore Type	Quadrant Edged Type
Suitable for standard service such for clean liquid, gas and vapor, and special material should be considered for harsh service.	Applicable for liquids containing gases or solids. This orifice plate is used with its eccentric bore at the bottom to avoid stay of solid, or at the top to avoid stay of gas or vapor.	Applicable for fluids containing heavy sediments. B is 98% of line I.D and h is a height of circular segment.	Applicable for fluids that have high viscosity and/ or low Reynolds number. High durability and life cycle can be affected by the thickness of plate and rounded edge of bore.

Application of Orifice Plate

■ E : Designed for this application
■ X : Not designed for this application
■ O : Normally applicable for this application

Specification

Dimension Table of Orifice Plate

Dimension Table of Orifice Assembly

FOR ANSI 300 FLANGES

FOR ANSI 600 FLANGES

FOR ANSI 900 FLANGES

FOR ANSI 1500 FLANGES

Required Straight Pipe Length

Orifice Plate with Holder Ring
Model : HOP-RJ

Overview

Holder Ring Assembly is a combination of holder ring and orifice plate which is designed for RTJ (Ring Type Joint) flange. The holder ring has a function of holder for orifice plate and gasket to prevent a leakage of fluid. Metallic Sealing System is appropriate for high temperature and pressure condition. Flange tap is generally used as pressure taps.

Specification

Orfice Ring Assembly
Model : HOR

Overview

Orifice Ring Assembly is used for the flow measurement, especially for small sized pipe line with low pressure. It is composed of an orifice plated and two orifice rings, and corner tap is used as pressure taps.

Specification

ORIFICE RING ASSEMBLIES	ORIFICE BLOCKS	RING TYPE ORIFICE BLOCKS

Orifice Flange Assembly
Model : HOF

Typical Components of Orifice Assembly

Orifice Plate requires flanges assembly to be installed at the site after precise machining of bore diameter. It is assembled between flanges together with gasket and pressure taps are machined on the flanges for accurate differential pressure measurement.

Specification

Restriction Orifice
Model : HRO

Overview

HRO Series is an element to use for reduction of the fluid pressure in the pipeline and can be applied for all liquid, gas and steam. When the pressure is rapidly reduced from high to low, the pipe and other device can be damaged due to the noise and vibration caused by cavitation phenomenon. However, HRO Series can reduce a pressure in the pipeline without cavitation phenomenon. HRO Series has been developed with KHNP (Korea Hydro & Nuclear Power) to apply for Q class in the nuclear power plant. It is designed and manufactured according to a seismic analysis, differential pressure, beta ratio, number of holes and process conditions, etc. There are two types, flat and conical in HRO Series and flat type includes multiple and single type. HRO Series is designed and manufactured using our software developed by ourselves under the strict quality assurance system.

Flat Type	Conical Type	Multi-Stage Type