DDTOP LG Orifice Plate

Description of DDTOP LG Orifice Plate

The LG type flow measurement flow element is the most widely used flow measurement instrument. It has the advantages of simple structure, easy installation, stable performance, and high accuracy. It can be used for liquid, vapor and gas flow measurement in modern industry. The LG type flow measurement flow element produced by our company adopting advanced calculation methods and precise processing methods has a wide range of varieties (in line with GB/T2624-2006, ISO5167-1-2003, BS1042-1989, American Mechanical Engineering Association standards, etc.), With complete specifications, it is widely used in petroleum, chemical, electric power, light industry, water supply, gas transmission and other fields.

Operating Principle

In the pipeline filled with single-phase continuous fluid, install a flow element (such as an orifice). When the fluid passes through the orifice of the flow element, the vapor forms a local contraction, the flow velocity increases, the kinetic energy increases, and the static pressure decreases. There is a static pressure difference between the front and back of the flow element, that is, ΔP = P1-P2. If the area of the orifice is F, the mass flow of the fluid is qm, the volume flow is qv, and the density is ρ, according to the principle of flow continuity and Bernoulli equation can derive the relationship between pressure difference and fluid flow:

In the formula, α is the flow coefficient. It can be seen from the above relationship that if the orifice area and fluid density are constant, the flow rate is proportional to the square root of the pressure difference, that is, as long as the pressure difference is measured, the flow rate can be calculated. The flow element measures the fluid flow rate based on this principle.

Features

1.Structure is simple, easy to install, reliable to work, accuracy can meet the needs of engineering survey.

2.It has pure mechanical structure, according to the site high temperature and high pressure conditions to select appropriate structure and material. The highest pressure is 42 Mpa and the highest temperature is 500℃.

3.Flow element has a long history of use, it has rich and reliable experimental data. Design and processing has been standardized. Standard orifice plate is no need to carry out the real flow calibration and maintenance.

Applications

• Refining: Catalytic cracking, Acid-containing sedimentation tank, Hydrocracking, Coking, Isomerization, Crude oil desalination, Sulfur recovery, Catalytic reforming
• Natural Gas: Light hydrocarbon recovery
• Crude Oil Treatment: Metering station

Technical specifications of DDTOP LG Orifice Plate

• Nominal diameter：DN50~DN1000
• Nominal pressure：0~42.0MPa
• Aperture ratio：1≤β≤0.75
• Range ratio：1：10
• Accuracy：±1%
• Temperature：-196℃≤T≤+650℃

How to buy DDTOP LG Orifice Plate

Model Selection Table

Table 1 Flow Element Code and Meaning

Table 2 Tap Method and Meaning

Table 3 Nominal Diameter Code and Meaning

Table 4 Nominal Pressure Code and Meaning

Table 5 Straight Pipe Section Code and Meaning

2. Executive Standard

2.1 Flow Element Executive Standard

For example, DN50 CL300 flange tap standard orifice model is LGYF-0505A.

2.2 Flange and Gasket Executive Standard

Flange and gasket standards can be selected from HG/T20592～20614-09 (European system) or HG/T20615～20635-09 (American system) or other standards.