Calibration safety valve & pressure gauge di Johor

1. Why Calibration Is Necessary

In any pressurized system, especially air compressor systems, safety relief valves and pressure gauges are critical components for safe operation and accurate monitoring.

• A safety relief valve protects against overpressure. If it's not properly calibrated, it may fail to open on time, leading to system failure or explosion.

• A pressure gauge provides the operator with real-time pressure data. If inaccurate, it may lead to poor decisions, unsafe conditions, or damage to equipment.

     Regular calibration ensures:

• Safe operating conditions

• Accurate pressure readings

• Regulatory compliance

• Extended equipment lifespan

2. Calibration of Safety Relief Valve

 Purpose:

• Ensure the valve opens at the correct set pressure (e.g., 10 bar)

• Prevent premature discharge or delayed activation during overpressure situations

 Regulatory Requirements in Malaysia:

• Under DOSH (Department of Occupational Safety and Health) / JKKP, safety valves on pressure vessels must be inspected and calibrated annually

• A Competent Person (CP) or certified third-party must carry out the calibration

• Calibration records are required for audits and inspections

 General Calibration Process:

• Remove valve from system (if not inline testable)

• Apply pressure using a calibrated test rig

• Record set pressure (when it opens) and reseating pressure

• Adjust if necessary or replace the valve

• Attach calibration label and issue a calibration certificate

3. Calibration of Pressure Gauge

 Purpose:

• Ensure pressure readings are accurate and within acceptable error limits

• Support safe operation and reliable system monitoring

 Recommended Calibration Frequency:

• Every 6 to 12 months, depending on:

  • Usage frequency

  • Environmental conditions

  • Criticality of the application

• For high-precision or safety-critical systems: every 3 to 6 months

 General Calibration Procedure:

• Connect the gauge to a calibrated pressure source (e.g., hand pump with digital master gauge)

• Check gauge readings at various test points (0%, 25%, 50%, 75%, 100%)

• Compare with the reference standard

• Adjust if possible, or replace if outside of tolerance

• Label and document results in a calibration report

4. Important Notes and Best Practices

• Calibration must be performed by qualified personnel using traceable standard equipment

• Ensure devices are clean and in good condition before calibration

• Maintain full documentation, including:

  • Calibration date

  • Technician name

  • Equipment used

  • Results and next due date

• Replace any valve or gauge that fails calibration

5. Summary Table

Proper calibration of safety relief valves and pressure gauges is a critical part of preventive maintenance. It ensures system safety, compliance with Malaysian regulations (DOSH), and prevents costly failures or accidents.

 Recommendation: Schedule regular calibration with certified personnel, and always maintain records for audit and traceability purposes.