NAKAKITA SEISAKUSHO NS-967F AIR PURGE UNIT – Complete Technical Guide for Marine Draft Gauge & Tank Level Measurement Systems
Introduction
The NAKAKITA SEISAKUSHO NS-967F Air Purge Unit is a critical component used in marine draft gauge and tank level measurement systems onboard commercial vessels. Designed and manufactured by Japan's renowned Nakakita Seisakusho, the NS-967F provides reliable pneumatic pressure generation for accurate draft and tank level monitoring.
These units are widely installed on bulk carriers, tankers, container vessels, LPG/LNG carriers, offshore support vessels, and other commercial ships where precise draft measurements are essential for navigation safety and cargo management.
NAKAKITA NS-967F Air Purge Unit
What is the NS-967F Air Purge Unit?
The NS-967F Air Purge Unit is a pneumatic device that continuously supplies compressed air into draft measuring pipes or tank sounding pipes.
By maintaining a constant airflow, the system measures the hydrostatic pressure exerted by seawater or liquid inside a tank. This pressure is then converted into draft or level readings displayed on bridge indicators and cargo monitoring systems.
The technology is simple, reliable, and highly accurate, making it one of the most trusted methods for marine draft measurement.
Main Functions of the NS-967F
Continuous Air Supply
Maintains a steady airflow through draft sensing lines.
Draft Measurement Support
Provides pressure reference for draft gauge systems.
Tank Level Monitoring
Used in ballast and service tank measurement systems.
Pressure Stabilization
Ensures accurate hydrostatic pressure measurement.
Marine Automation Integration
Works with vessel monitoring and automation systems.
Working Principle
The NS-967F operates using the well-established pneumatic bubbling principle.
Step 1
Compressed air enters the Air Purge Unit.
Step 2
The unit regulates airflow and pressure.
Step 3
Air is sent through sensing tubes installed below the waterline or inside tanks.
Step 4
Air bubbles exit from the tube opening.
Step 5
The pressure required to release the bubbles corresponds to the liquid height.
Step 6
Pressure signals are transmitted to draft indicators and monitoring systems.
Step 7
The bridge receives accurate draft or tank level readings.
Marine Draft Measurement Applications
Key Features
High Reliability
Designed for continuous operation in harsh marine environments.
Japanese Engineering
Manufactured by NAKAKITA SEISAKUSHO of Japan.
Long Service Life
Robust construction ensures years of reliable service.
Corrosion Resistance
Suitable for marine engine room and cargo environments.
Easy Installation
Simple integration with existing draft gauge systems.
Low Maintenance
Requires minimal servicing when operated correctly.
Stable Air Output
Provides accurate measurement results.
Applications on Ships
The NS-967F Air Purge Unit is commonly used on:
Bulk Carriers
Draft monitoring during cargo loading and unloading.
Oil Tankers
Ballast and cargo level measurement.
Chemical Tankers
Tank level monitoring systems.
Container Vessels
Draft indication and ballast management.
Offshore Vessels
Marine tank monitoring systems.
General Cargo Ships
Hydrostatic pressure measurement applications.
Importance of Draft Measurement
Accurate draft measurement is essential because it helps operators:
- Prevent overloading
- Ensure safe navigation
- Comply with SOLAS regulations
- Monitor ballast conditions
- Improve fuel efficiency
- Optimize cargo operations
- Maintain vessel stability
Typical Draft Gauge Installation
Main Components Associated with NS-967F
A complete draft measurement system may include:
Air Purge Unit
NS-967F
Draft Sensors
Pressure Transmitters
Draft Indicators
Tank Level Displays
Monitoring Controllers
Pneumatic Tubing
Junction Boxes
Common Problems and Troubleshooting
No Draft Reading
Possible Causes
- Air supply failure
- Blocked tubing
- Internal valve malfunction
Solution
- Check air source
- Inspect tubing
- Verify purge operation
Unstable Reading
Possible Causes
- Water ingress
- Air leakage
- Damaged tubing
Solution
- Check piping integrity
- Replace damaged components
- Verify pressure stability
Low Air Flow
Possible Causes
- Blocked filter
- Regulator issue
- Internal contamination
Solution
- Clean filters
- Inspect regulator
- Service purge unit
Maintenance Guidelines
Monthly
- Visual inspection
- Leak checking
Quarterly
- Air pressure verification
- Tubing inspection
Annually
- Complete functional testing
- Internal cleaning
- Calibration verification
Proper maintenance significantly increases service life and measurement accuracy.
Advantages of the NS-967F System
Compared with alternative technologies, the NS-967F offers:
- Proven pneumatic technology
- High reliability
- Easy maintenance
- Long operating life
- Accurate measurement
- Low operating cost
- Global service acceptance
- Marine industry approval
Marine Tank & Draft Monitoring Systems
Frequently Asked Questions (FAQ)
What does the NS-967F Air Purge Unit do?
It supplies regulated air for draft and tank level measurement systems.
Is it used only for draft gauges?
No. It can also be used in tank level monitoring applications.
Which ships use NS-967F?
Bulk carriers, tankers, container ships, offshore vessels, and general cargo ships.
Is calibration required?
Periodic verification is recommended to maintain accuracy.
Can it be integrated with automation systems?
Yes. It can work alongside various marine monitoring and automation systems.
Available Documentation
Typical documentation includes:
User Manual
- Installation Instructions
- Operating Procedures
- Safety Information
Technical Manual
- Pneumatic Diagrams
- Specifications
- Maintenance Procedures
Service Documents
- Spare Parts List
- Troubleshooting Guide
- Calibration Instructions
Why Choose SM MARINE SERVICE™?
SM MARINE SERVICE™ supplies genuine and reconditioned marine automation equipment to ship owners, ship management companies, shipyards, and marine service providers worldwide.
Available Condition
- Used
- Reconditioned
- Refurbished
- Tested Before Delivery
Services
- Worldwide Shipping
- Technical Support
- Marine Automation Solutions
- Spare Parts Supply
- Draft Gauge Equipment Supply
SM MARINE SERVICE™
Marine Automation & Navigation Equipment Specialist
???? Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
Stock Available
NAKAKITA SEISAKUSHO NS-967F AIR PURGE UNIT
- Fully Reconditioned Units Available
- Tested Before Delivery
- Worldwide Export Service
- Competitive Pricing
- Immediate Shipment Available