A differential pressure gauge is an instrument used to measure the pressure difference between two pressure points, while a high-static-pressure differential pressure gauge is a special type that, based on ordinary differential pressure gauges, has a stronger ability to withstand high static pressure. The following will elaborate on its functions and application scenarios:

I. Functions of High-Static-Pressure Differential Pressure Gauges

1. Precise measurement of differential pressure values

• In environments with high static pressure (such as high baseline pressure in pipelines), it accurately measures the pressure difference between two points without being interfered by the background high pressure. For example, when the static pressure in a pipeline is 10 MPa, it can still precisely detect a tiny differential pressure change of 0.1 kPa.

2. Protection of instruments and system safety

• The high-static-pressure design prevents the instrument from being damaged by excessive static pressure (e.g., diaphragm rupture, housing deformation) and avoids system misjudgments caused by instrument failures (e.g., false alarms of pressure abnormalities).

3. Adaptation to complex working condition monitoring

• Suitable for scenarios with both high pressure and differential pressure fluctuations, such as monitoring the differential pressure before and after filters in high-pressure gas transportation or measuring flow differential pressure in high-pressure liquid systems.

4. Provision of stable data references

• Maintains measurement accuracy in high-pressure environments, providing reliable data for process control and equipment maintenance. For instance, it judges whether the pipeline is blocked or the valve opening is appropriate through changes in differential pressure.

II. Application Scenarios of High-Static-Pressure Differential Pressure Gauges

1. Industrial process control

• Applications: Measuring the pressure difference between hot blast stoves and blast furnaces in blast furnace air supply systems (controlling stable air supply pressure), monitoring filter differential pressure in high-pressure rolling oil systems (ensuring oil cleanliness).

• Applications: Monitoring the differential pressure of filters in steam turbine lubrication systems (preventing bearing lubrication failure caused by filter blockage), monitoring the differential pressure at the inlet and outlet of high-pressure boiler water walls (judging the normality of water circulation).

• Applications: Liquid level monitoring of materials in high-pressure reactors (calculating liquid level height through differential pressure), measurement of pressure differences across distillation column trays (judging column resistance and mass transfer efficiency).

• Petrochemical industry

• Power industry

• Metallurgical industry

2. Energy and gas transportation

• Applications: Measuring the differential pressure at the inlet and outlet of heat exchangers in high-pressure steam pipe networks (judging heat transfer efficiency), regulating differential pressure at branch points of heating pipelines (balancing heating pressure in each region).

• Applications: Measuring the pressure difference before and after valves in high-pressure gas transmission pipelines (judging valve opening or throttling), monitoring the differential pressure at the inlet and outlet of compressors (evaluating compressor efficiency).

• Natural gas transportation

• Urban heating systems

3. Aerospace and military industries

• Applications: Monitoring the pressure difference before and after oil cylinders in ship high-pressure hydraulic systems (controlling the action accuracy of shipborne weapon equipment), detecting the airtightness of submarine compartments (judging air leakage through differential pressure changes).

• Applications: Measuring the pressure difference between the combustion chamber and turbine section in engine high-altitude simulation tests (evaluating combustion efficiency and airflow resistance).

• Aero-engine testing

• Shipborne equipment monitoring

4. Scientific research and laboratories

• Applications: Measuring the pressure difference before and after models in wind tunnel experiments (calculating aerodynamic drag), monitoring pressure changes in high-pressure water impact experiments.

• Applications: Measuring the pressure difference inside and outside the experimental chamber in high-pressure gas or liquid experimental devices to ensure the stability of the experimental environment (e.g., high-pressure diamond synthesis experiments).

• High-pressure physics experiments

• Fluid mechanics research

5. Environmental protection and water treatment

• Applications: Monitoring the pressure difference between the inlet and  water (concentrated water) ends in reverse osmosis (RO) membrane devices (evaluating membrane element blockage and adjusting operation parameters).

• Applications: Measuring the differential pressure before and after membrane modules in high-pressure membrane bioreactors (MBR) (judging membrane pollution degree and performing backwashing in a timely manner).

• Sewage treatment plants

• Seawater desalination systems

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  IV. Selection Considerations

• Static pressure bearing capacity: Select a model with a static pressure capacity greater than the maximum system static pressure (usually leaving a 20%–30% safety margin).

• Differential pressure range: Ensure that the measured differential pressure value is within 10%–90% of the instrument's range to avoid accuracy degradation caused by excessively large or small ranges.

• Medium compatibility: Choose appropriate diaphragm materials (such as 316L stainless steel, Hastelloy) according to the measured medium (e.g., corrosive gases, viscous liquids).

• Protection level: In industrial fields, select a protection level of IP65 or above to prevent dust and water vapor from invading and affecting instrument performance.

• High-static-pressure differential pressure gauges provide key data support for process optimization, equipment maintenance, and safe operation in various industries by accurately measuring differential pressure in high-pressure environments, making them indispensable measurement tools in high-pressure systems.