● Structural characteristics
1. Pipeline type integrated orifice plate: Regardless of the diameter of the pipeline, the centers of the upstream and downstream pressure tapping holes are located one inch each from the end faces of the orifice plate. This form is commonly used in refining systems.
2. Clamp type integrated orifice plate: It is widely used due to the implementation of ring chamber pressure measurement, which improves measurement accuracy and shortens the minimum length of straight pipe segments required for installation.
● Performance characteristics
1. The structure is easy to replicate, simple and sturdy.
2. Stable and reliable performance, low price, and long service life.
3. Standard orifice plates are calculated and processed according to international standards, and do not require real flow calibration.
4. Single phase flow (liquid, gas, steam) can be measured.
5. Adopting intelligent differential pressure transmitter with high accuracy and programmable range.
6. The intelligent integrated orifice flowmeter can simultaneously display cumulative flow rate, instantaneous flow rate, pressure, and temperature.
7. Equipped with a HART communication interface, it has high stability.

Nominal diameter: DN25～DN1000（mm）
Accuracy: ± 1.0% FS, ± 1.5% FS
Range ratio: standard 1:3; Expansion 1:5
Work pressure: ≤ 25MPa
Medium temperature:- 40℃-450℃
Medium viscosity: ≤ 30CP (equivalent to heavy oil)
Beta value: 0.2-0.8
Connection methods: flange type, clamp type
Pressure measurement methods: ring gap pressure measurement, inch pressure measurement
Installation method: horizontal or vertical
Power supply: 24V DC (requires differential pressure transmitter)
Display: 8-bit LCD displays instantaneous flow and cumulative flow (equipped with a flow integrator)
Output signal: (1) 4-20mA DC flow signal (2) HART protocol compliant output signal
Explosion proof performance: intrinsic safety type IbIICT5
Protective performance: IP65

1. Pipeline diameter, wall thickness, and material
2. Measuring medium
3. Medium temperature (℃)
4. Working pressure of medium (MPa): maximum pressure, normal pressure, minimum pressure
5. Medium working flow rate: maximum flow rate, normal flow rate, minimum flow rate
6. Medium operating viscosity (mPa. s)
7. Medium density (kg/m3)
8. Allow for pressure loss
9. On site pipeline laying situation and form of local resistance components.

Before installing the orifice plate, carefully check whether the standard orifice plate's number, tag number, and specifications match the pipeline conditions, flow range, and other parameters.
2. When setting up a new pipeline system, it is necessary to first flush and clean the lines before installing the orifice plate to prevent debris from blocking or damaging the orifice plate inside the pipeline.
3. The center of the orifice plate should be coaxial with the center of the pipeline, and the coaxiality error should not exceed ± 0.015 * (1/β) -0.015. And the plane of the throttling end should be perpendicular to the pipeline, with an error not exceeding ± 1 °.
When installing the orifice plate, the gasket must not protrude into the inner wall of the pipeline after clamping.
5. The installation of the orifice plate must be tight and no leakage is allowed. After installation, conduct a pressure test.
If valves need to be installed before and after the orifice flowmeter, it is best to choose gate valves and fully open them during operation; The regulating valve should be located in the downstream pipeline after 5DN.
When measuring liquid flow rate, the horizontal section of the pressure pipe should be in the same horizontal plane. If throttling devices are installed on vertical pipelines, a certain distance (perpendicular direction) between the short pressure pipes will affect the zero point of the differential pressure transmitter, which should be corrected through "zero point migration".
8. The pressure pipeline must always maintain a single-phase fluid state. When the measured fluid is a gas, the entire pressure pipeline (including the pressure chamber of the differential pressure gauge) is in the gas phase; When the measured fluid is a liquid, the entire pressure pipeline is in liquid phase and there must be no bubbles.
9. The upstream and downstream sides of the throttling device must ensure a certain length of straight pipe section, with specific requirements as shown in the table below: