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Understanding Maximum Working Pressure & Burst Pressure in Disc Filter
2026-06-22
What Do "Maximum Working Pressure" and "Burst Pressure" Mean for Disc Filters?
When sourcing industrial filtration equipment, maximum working pressure and burst pressure listed on technical data sheets are two core indicators that determine equipment selection, safety margins, and long-term operating costs. For disc filters widely used in water treatment, chemical processing, irrigation, and other fields, a clear understanding of these two concepts — including their definitions, testing standards, and interrelationship — is essential for making scientific procurement decisions. Based on international common standards and industry best practices, this article provides a professional analysis of these two critical pressure values.
1. Core Definitions & Key Distinctions
Maximum Working Pressure
Maximum working pressure refers to the highest permissible pressure that the filter housing and internal components can withstand under continuous, normal operating conditions. This value reflects a comprehensive combination of equipment design, material selection, and manufacturing processes, and serves as the upper pressure limit for long-term stable system operation.
For example:
- Some industrial-grade plastic disc filters have a maximum working pressure of 8 bar (116 psi).
- Filter components used in high-pressure hydraulic systems can reach 165.4 bar (2400 psi).
- In irrigation applications, maximum working pressure varies clearly by disc filter specification, ranging from 115 psi to 174 psi.
Burst Pressure
Burst pressure is the pressure value at which the filter housing or pressure boundary components rupture or lose structural integrity under gradually increasing static pressure. It represents an ultimate failure limit — the absolute upper pressure the equipment can withstand under extreme conditions.
International standard ISO 4548-6 specifies static burst pressure test methods for full-flow oil filters, and these methods are also widely applied to other types of pressure filters. The test is designed to determine both the burst pressure value and the failure mode of the filter.
2. Critical Differences & Safety Margins
The most fundamental distinction is:
- Maximum working pressure is the safe ceiling for daily operation.
- Burst pressure is the physical limit of structural failure.
A reliable filtration system must maintain a maximum working pressure substantially lower than burst pressure; the gap between them forms the safety margin.
This margin is commonly expressed as a ratio between working pressure and burst pressure. A general industry rule is that maximum working pressure should not exceed a specified percentage of the minimum burst pressure. For instance, in rupture disc technical specifications, the maximum operating ratio is set at 85% of the minimum burst pressure — a principle equally applicable to filter design.
A well-engineered filter typically has a burst pressure several times its working pressure. For example, a filter component rated for 165.4 bar working pressure may have a rated static burst pressure of 552 bar, providing a safety factor of over 3.
3. Influencing Factors in Practical Applications
In real-world use, these two pressure values are not isolated figures; they are significantly affected by the following factors:
Temperature
Mechanical strength of filter housing materials and sealing elements (such as EPDM and FKM/Viton) varies with temperature. Generally, allowable maximum working pressure decreases as operating temperature rises. For example, a disc filter may allow a maximum differential pressure of 2.07 bar at 25°C, but only 1.03 bar at 80°C.
Differential Pressure (ΔP)
Beyond system static pressure, attention must be paid to the pressure difference between inlet and outlet. As Filter Elements become clogged with contaminants, differential pressure increases, creating additional stress on the core and housing structure. For this reason, many filters specify bothmaximum working pressure and maximum allowable differential pressure.
Material & Structure
Pressure ratings are directly determined by:
- Housing materials (reinforced nylon, stainless steel, carbon steel)
- Filter media (PP, stainless steel)
- Connection types (threaded, flanged)
Plastic-housed filters generally have lower maximum working pressure than metal-housed units.
4. Implications for Procurement Decisions
For purchasers, understanding these two parameters supports more precise selection:
System Matching
Ensure the filter’s maximum working pressure exceeds the highest operating pressure your system may experience under all expected conditions — including startup, shutdown, and temperature fluctuations.
Safety Verification
Ask suppliers for burst pressure test data and applicable standards (e.g., ISO 4548-6). Third-party testing or traceable test reports provide strong evidence of product reliability.
Risk Assessment
For systems with large pressure fluctuations or water hammer risks, selecting filter models with higher burst pressure (and thus wider safety margins) is a necessary risk control measure.
Conclusion
Maximum working pressure is the rated value for normal filter operation, while burst pressure represents the ultimate limit of structural strength. Excellent engineering design maintains sufficient safety margin between the two, ensuring stable performance under complex real-world conditions and physical redundancy against abnormal pressure shocks.
Reviewing both parameters and their supporting test data during procurement is a professional approach to evaluating overall product quality and system safety.