Seek advice on the installation of catalytic pressure-reducing orifice plates
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Are there any requirements for installing the flue pressure-reduction orifice plate in a catalytic cracking unit? Is a straight pipe section necessary? Are there any requirements regarding the distance before and after the orifice plate? Must it be installed horizontally only? What are the requirements for selection? I hope experts can give some guidance. Thank you very much
Application range of orifice plate flow meters:
1. Nominal diameter: 15 mm ≤ DN ≤ 1200 mm
2. Nominal pressure: PN ≤ 40 MPa
3. Operating temperature: -50°C ≤ t ≤ 550°C
4. Range ratio: 1:10, 1:15
5. Accuracy: Class 0.5, Class 1
Throttle devices, also known as differential pressure flow meters, consist of a primary sensing element (throttle element) and secondary components (differential pressure transmitter and flow display instrument). They are widely used for measuring the flow rate of gases, steam, and liquids, and feature a simple structure, easy maintenance, stable performance, and reliability.
Overview of orifice plate flow meters: The orifice plate throttle device uses standard throttle elements that can be manufactured directly in accordance with standards without the need for calibration. These standards include:
1. National standard GB2624-81
2. International standard ISO5167
3. Ministry of Chemical Industry standard GJ516-87-HK06
Working principle of orifice plate flow meters: The fluid filling the pipeline flows through the throttle device inside it, causing a local constriction near the throttle element, which increases the flow velocity and results in a static pressure difference on the upstream and downstream sides. Given the known parameters, the relationship between differential pressure and flow rate can be derived using the principle of fluid continuity and Bernoulli’s equation, thereby allowing the flow rate to be determined. Structure of orifice plate flow meters: Components of the throttling device. Throttling elements: standard orifice plates, standard nozzles, long-diameter nozzles, 1/4 circular orifice plates, double orifice plates, eccentric orifice plates, notched orifice plates, conical inlet orifice plates, etc. Pressure extraction devices: annular chambers, pressure extraction flanges, clamping rings, pressure guide tubes, etc. Connection flanges (**standard, various standards, and flanges designed by other parties), fasteners. Installation requirements for orifice plate flowmeters: The required straight pipe sections are generally 10D in front and 5D behind the orifice plate. Therefore, when selecting an orifice plate flowmeter, it is essential to choose one that is suitable for the actual operating conditions at the site.
1. Nominal diameter: 15 mm ≤ DN ≤ 1200 mm
2. Nominal pressure: PN ≤ 40 MPa
3. Operating temperature: -50°C ≤ t ≤ 550°C
4. Range ratio: 1:10, 1:15
5. Accuracy: Class 0.5, Class 1
Throttle devices, also known as differential pressure flow meters, consist of a primary sensing element (throttle element) and secondary components (differential pressure transmitter and flow display instrument). They are widely used for measuring the flow rate of gases, steam, and liquids, and feature a simple structure, easy maintenance, stable performance, and reliability.
Overview of orifice plate flow meters: The orifice plate throttle device uses standard throttle elements that can be manufactured directly in accordance with standards without the need for calibration. These standards include:
1. National standard GB2624-81
2. International standard ISO5167
3. Ministry of Chemical Industry standard GJ516-87-HK06
Working principle of orifice plate flow meters: The fluid filling the pipeline flows through the throttle device inside it, causing a local constriction near the throttle element, which increases the flow velocity and results in a static pressure difference on the upstream and downstream sides. Given the known parameters, the relationship between differential pressure and flow rate can be derived using the principle of fluid continuity and Bernoulli’s equation, thereby allowing the flow rate to be determined. Structure of orifice plate flow meters: Components of the throttling device. Throttling elements: standard orifice plates, standard nozzles, long-diameter nozzles, 1/4 circular orifice plates, double orifice plates, eccentric orifice plates, notched orifice plates, conical inlet orifice plates, etc. Pressure extraction devices: annular chambers, pressure extraction flanges, clamping rings, pressure guide tubes, etc. Connection flanges (**standard, various standards, and flanges designed by other parties), fasteners. Installation requirements for orifice plate flowmeters: The required straight pipe sections are generally 10D in front and 5D behind the orifice plate. Therefore, when selecting an orifice plate flowmeter, it is essential to choose one that is suitable for the actual operating conditions at the site.
The new standard is \"Measurement of fluid flow rate in fully filled pipes using differential pressure devices installed in circular cross-section pipes\" GB/T 2624-2006.
In catalytic cracking units, the flue gas pressure-reduction orifice plates can be installed either horizontally or vertically; a certain length of straight pipe section is required to facilitate inspection and maintenance
This LZ question should not be placed in the automatic control section
There are requirements for the distance between the straight pipe sections at both ends.