Subsea Chain Inclinometer for Mooring Inspection | iSubC

Calibrated subsea chain angle measurement tool for offshore inspection and commercial diving

The iSubC Chain Inclinometer is a mechanical subsea inspection tool used to measure the angle of mooring chains, anchor lines and underwater structures. It requires no batteries, uses a gravity-actuated pendulum pointer, and is supplied with a third-party calibration certificate for offshore inspection and commercial diving work.

The iSubC Chain Inclinometer is designed for subsea inspection, mooring surveys, offshore engineering and commercial diving operations. It provides divers and inspectors with a reliable method of verifying chain angle, alignment, tension and installation geometry.

Unlike electronic instruments, the inclinometer uses a gravity-actuated mechanical pendulum pointer, eliminating the need for batteries, charging or external power supplies. Its rugged, corrosion-resistant construction and high-visibility scale make it suitable for harsh marine and offshore environments.

Each unit is supplied with a third-party calibration certificate, providing independent verification of measurement accuracy and supporting inspection, survey and quality assurance requirements.

What is a subsea chain inclinometer?

A subsea chain inclinometer is a specialist inspection instrument used to measure the angle of underwater chains, mooring systems, anchor lines and structural components.

These instruments are commonly used during:

• Mooring inspections
• Anchor installation verification
• Offshore structural surveys
• Marine construction projects
• Commercial diving inspections
• Subsea engineering works

By accurately measuring chain and structure angles, inspectors can confirm correct installation, loading conditions and structural alignment.

Key features

Third-party calibration certificate

Supplied with an independent third-party calibration certificate to verify measurement accuracy and support inspection documentation.

Mechanical operation

Uses a gravity-actuated pendulum mechanism, eliminating:

• Batteries
• Electronics
• Charging requirements
• Electronic failure risks

High-visibility scale

Bright yellow UV-resistant scale markings provide clear underwater visibility and easy reading in low-light conditions.

Rugged marine construction

Manufactured from durable composite and anodised aluminium materials designed to withstand:

• Offshore environments
• Marine exposure
• Commercial diving operations
• Long-term field use

Precision datum bar

An integrated straight-edge mounting base provides an accurate reference surface when measuring:

• Chains
• Pipes
• Structural members
• Beams
• Equipment frames

No power required

Purely mechanical operation eliminates calibration drift caused by battery failure or power loss.

Technical specifications

Specification	Value
Measurement range	20° to 100°
Scale increments	1°
Major graduations	20°, 30°, 45°, 60°, 75°, 90°, 100°
Mechanism type	Gravity-actuated mechanical pendulum
Frame material	Composite and anodised aluminium
Scale face	UV-resistant high-visibility markings
Mounting base	Integrated datum bar
Environment rating	Marine, offshore and outdoor deployment
Calibration	Third-party calibration certificate supplied

Download the product datasheet.

Typical applications

The iSubC Chain Inclinometer is widely used for:

• Mooring chain inspections
• Offshore platform surveys
• Anchor system verification
• Marine construction projects
• Commercial diving inspections
• Wet bell orientation checks
• Offshore structural alignment surveys
• Oceanographic research operations

Its simple mechanical design makes it particularly suitable for environments where reliability and repeatability are critical.

Why chain inclination measurement is important

Accurate chain angle measurement plays a vital role in offshore operations by helping operators:

• Verify correct anchor installation
• Confirm mooring system performance
• Assess structural loading conditions
• Identify alignment issues
• Support engineering inspections
• Improve operational safety

Regular inspection of chain angles can help identify potential issues before they develop into costly failures or operational downtime.

Advantages over electronic inclinometers

Mechanical inclinometers remain popular offshore because they:

• Require no batteries
• Operate reliably underwater
• Are resistant to harsh marine environments
• Require minimal maintenance
• Provide immediate readings
• Eliminate electronic failure risks

These characteristics make them a dependable inspection tool for commercial diving contractors and offshore engineers.

Industries using chain inclinometers

Chain inclinometers are widely used in:

• Offshore oil and gas
• Offshore wind energy
• Marine construction
• Port and harbour operations
• Commercial diving companies
• Oceanographic research
• Subsea engineering projects

Frequently asked questions

What is the iSubC Chain Inclinometer used for?

The inclinometer is used to measure the angle of subsea chains, moorings, anchor systems and underwater structures during inspection and survey operations.

Does the inclinometer require batteries?

No. The unit uses a gravity-actuated mechanical pendulum and requires no electrical power.

Is the unit calibrated?

Yes. Each inclinometer is supplied with a third-party calibration certificate.

What angle range can it measure?

The instrument measures angles from 20° to 100°.

Is it suitable for offshore use?

Yes. The inclinometer is designed for marine, offshore and commercial diving environments.

Enquire about the iSubC Chain Inclinometer

For technical details, pricing, or project support:

Email: info@isubc.com

Phone: +44 (0)1253 767788