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Nakakita Seisakusho Co., Ltd.

NSPB732, NSPS732, NSTBT732

Pressure Switch · Instrumentation & Gauges

Class-certified type (DNV register) · technical data sheet not yet verified​​‍⁠‍⁠​‌‍⁠‌⁠‌‍‌‍​​​‌

NSPB732, NSPS732, NSTBT732 by Nakakita Seisakusho Co., Ltd. DNV TA certificate TAA00002TU.

Inspection

Inspector Detail

Common issues

  • Signal drift or loss from antenna fouling (cargo vapour condensation or product buildup)
  • False echoes from tank internals (heating coils, ladders) causing erratic readings
  • Stillpipe/still-well misalignment or damage disturbing the radar signal path
  • Cable/connector corrosion at the tank-top junction box
  • Loss of communication with the cargo control room display/interface unit
  • Calibration drift versus manual ullage/dip readings over time

Inspection checklist

  • Cross-check the radar level reading against a manual ullage/dip at the same time
  • Inspect the antenna/stillpipe for product residue, coating, or obstruction where accessible
  • Check the junction box and cabling for corrosion, water ingress, or loose glands
  • Verify alarm setpoints (high level, high-high level) against the cargo/ballast system requirements
  • Confirm the reading is consistent across repeated checks with no erratic jumps
  • Check the power supply and communication link to the cargo control room

Service intervals

Cross-check against manual ullageevery cargo operation, or at least monthly if the tank is in continuous service
Junction box/cable inspectionannually
Alarm setpoint function testannually, and before each classification survey

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Level reading deviation vs manual dipa deviation beyond roughly 50-100 mm from a manual reference dip (indicative only) warrants recalibration or investigation - confirm the actual acceptable tolerance in the vessel's cargo system manual

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

Critical spares

  • Gauge head/transducer unit
  • Junction box terminal/cable gland set
  • Display/interface unit fuses or communication module, if held as a recommended spare

Safety

  • Level gauge failure on a cargo tank can lead to overfill if not cross-checked - never rely solely on the radar reading for critical operations
  • Work on the gauge head at the tank top may require a gas-free/hot work permit depending on the cargo
  • Electrical connections in a hazardous area must use only equipment and tools certified for that zone

Class survey

Surveys of cargo tank level gauging check calibration/cross-check records against an independent means (manual ullage or a second gauge), correct alarm setpoint function including any overfill alarm, and inclusion of the gauge in the vessel's planned maintenance system. For tankers this typically falls under cargo system periodic survey requirements.

Estimated lifetime: Radar level gauge transducer units in continuous tank service are typically expected to remain serviceable for 10-15+ years with periodic calibration checks; display/electronics units may need earlier replacement depending on environment

Classification

DNV type approval

Listed in the DNV Approval Finder at the time we recorded it. The certificate is issued by DNV, not by us; check its current status at DNV.

CertificateTAA00002TU
Open the certificate at DNV
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