SG CS Performance Monitoring System

Common issues

• Radar signal loss or erratic readings from foam, turbulence, or vapor condensation on the antenna
• Antenna or still-pipe fouling from cargo residue or wax buildup affecting accuracy
• Communication link failure between the tank unit and the cargo control room display
• Calibration drift over time versus manual dip/ullage readings
• Power supply or intrinsically-safe barrier fault causing loss of reading
• Water ingress into the tank-top junction box affecting signal integrity

Inspection checklist

• Cross-check radar reading against manual ullage/dip measurement
• Inspect antenna horn/still-pipe for residue buildup or damage where accessible
• Verify junction box and cable gland sealing at the tank top
• Check intrinsically-safe barrier and power supply status
• Confirm high-level and high-high alarm setpoints against the cargo plan
• Review historical trend data for drift or erratic behaviour
• Test the communication link to the cargo control room / IAS
• Verify still-pipe venting, where fitted, is not obstructed

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Antenna/radar sensor unit of matching type
• Junction box seal and cable gland set
• Intrinsically-safe barrier module
• Display/interface unit fuses
• Communication cable

Safety

• False level readings can lead to tank overfill - a major fire/explosion and pollution hazard
• Work on tank-top electrical connections requires intrinsically-safe procedures and gas-free verification
• High-level alarm bypass or failure removes a critical overfill safeguard - never disable without compensating measures
• Static discharge risk when opening tank fittings on tanks carrying flammable cargo

Class survey

Class and cargo surveys typically check that the high-level alarm is independently tested from the primary gauging system, that calibration records exist, and that the installation matches the tank's approved custody-transfer/overfill protection arrangement.