Application of Safety Valves in Sewage Treatment Plant Equipment

Water Treatment Industry

Customized duplex stainless steel safety valves in three types solve the traditional valve defects of poor medium adaptability, insufficient working condition compatibility and low stability, achieving precise, reliable and long-service-life overpressure protection for complex working conditions of the Tianjin Nangang ABS sewage treatment unit.

Background

Safety valves serve as core protective equipment in sewage treatment plants. Their opening-closing sensitivity and pressure relief stability directly safeguard pressure-bearing equipment and pipelines, ensuring uninterrupted process operation as well as personnel and environmental safety. Critical positions in sewage treatment require reliable overpressure protection that accommodates corrosive sewage, solid-containing properties and diverse working conditions. Customized Great safety valves are deployed for the ABS sewage treatment unit in Nangang, Tianjin, adapting to special media and supporting safe and efficient system operation.

Key challenge

  1. Poor medium adaptability: Activated sludge, chloride ions and other substances in sewage corrode valve bodies, causing seal failure and degraded pressure relief precision.
  2. Insufficient working condition compatibility: Positions including pump outlets and biogas storage cabinets have distinct requirements for pressure relief speed and discharge capacity, which conventional safety valves fail to meet accurately.
  3. Low installation compatibility: Compact layout of partial sewage treatment facilities and unreasonable structural design of traditional valves lead to poor flange matching and inconvenient installation.
  4. Inadequate long-term operational stability: Frequent pressure fluctuations trigger fatigue damage of valve opening and closing, shortening service life and raising maintenance costs and shutdown risks.
Application of Safety Valves in Sewage Treatment Plant Equipment 2 edited

Operation Condition

Product Name: Safety Valve

Application Scenario: ABS Sewage Treatment Unit, Nangang, Tianjin; applicable to pump outlet pipelines, anaerobic digesters, dosing system pressure tanks, steam & hot water heating systems

Function: Overpressure protection for key equipment and pipelines to maintain system safe operation under abnormal pressure

Medium: Activated sludge from ABS biochemical tank; solid content: 0.1%~0.2%; chloride ion concentration: ≤500~1400 mg/L

Caliber: DN40/80; DN80/100

Material: Duplex stainless steel 2205 / 316L

Connection Type: Flange connection

Nominal Pressure: PN20 / 150 LB

Set Pressure: 0.17 / 0.31 MPa

Discharge Capacity: 20~50m³/h

Design Service Life: 8-10 years

Commissioning Date: August 2025

Operating Site: ABS Sewage Treatment Unit, Nangang, Tianjin

Common Types:

  • Spring-loaded safety valve: Compact structure, rapid response, suitable for medium and low pressure systems
  • Full-lift safety valve: Large discharge volume, ideal for rapid pressure relief of biogas systems
  • Closed safety valve: Diverts discharged medium to safe areas or recovery systems, applicable to toxic, flammable and corrosive gas environments
Application of Safety Valves in Sewage Treatment Plant Equipment 1 edited

Performance Result

Adopting 2205 and 316L duplex stainless steel, the valves deliver outstanding corrosion resistance against chloride ions and activated sludge erosion, preventing seal failure, extending service life and cutting maintenance costs for long-term sewage treatment operation.

Three valve types are available to match pressure relief demands of different working positions. Stable set pressure of 0.17/0.31 MPa and discharge capacity of 20~50m³/h realize precise and rapid pressure relief and eliminate overpotential safety hazards.

Flange connection fits various pressure-bearing equipment and pipelines, facilitating installation and adapting to compact facility layout.

With 8-10 years design lifespan, the valves withstand frequent pressure variations effectively, minimizing fatigue damage and shutdown maintenance to guarantee continuous sewage treatment processes.

Closed safety valves isolate toxic and flammable discharged medium to designated safe zones or recycling systems, preventing environmental pollution and safety incidents and complying with safety and environmental protection standards.

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