QCY Cylindrical Fenders

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QCY Cylindrical Fenders

QCY Cylindrical Fenders are high quality, strong and long lasting units.Popular for over 50 years, cylindrical fenders are simple and effective for a range of ships and applications. They are commonly used in areas with small tides and where low hull pressures and reaction forces are not significant.

QCY Cylindrical Fenders are high quality, strong and long lasting units.

Popular for over 50 years, cylindrical fenders are simple and effective for a range of ships and applications. They are commonly used in areas with small tides and where low hull pressures and reaction forces are not significant.

A.Very simple design

B.Popular and effective

C.Easy to install

D.Wide range of sizes

E.Two standard compounds

F.Tested and certified according applicable standards

Fixing methodsPerformance Testing

XINYUE Technical Solutions routinely tests fenders to verify their consistent performance and quality. Testing facilities are independently

managed by government approved operators to guarantee the accuracy and authenticity of results. Client and third party attendance during testing is also welcomed.

Test Protocol

XINYUE Technical Solutions adopts the latest verification testing protocols defined by PIANC¹ and ASTM² to confirm fenders meet the published Rated Performance Data (RPD) for QCN cones, QCL cells and QME elements³.

Calibration	Test apparatus is calibrated to ±1% and independently certified.
Identification	Fenders are identified with a unique serial number and job reference number to allow full document traceability. RFID tag identification is available on request for some fender types.
Sampling	10% (min) of randomly selected fenders are tested, rounded up to the nearest whole unit. More frequent testing can be carried out on request. Sampling of the remaining fenders is increased to 20% if any fender does not meet the required values and to 100% if further fenders do not meet the required values.
Dimensions	Primary dimensions of the fenders are measured and recorded.
Preparation	Prior to verification tests, fender samples will be preconditioned by compressing three or more times to rated deflection and allowed to recover for at least one hour. Fenders may then be normalised (see below) if required.
Test conditions	Test speed is steady state 0.3–1.3mm/s (typically 1mm/s) Fender temperature is normalised to 23°C ±5°C Testing is under axial compression (0° angl
Normalising	If fenders are stored at an ambient temperature of 23°C ±10°C for more than 8 hours, then fenders shall be “normalised” in a temperature controlled environment at 23°C ±5°C for a time not less than t=20X1.5 (where X=greatest wall thickness of rubber in metres).
Results	Reaction and deflection shall be recorded at maximum intervals of 0.01H–0.05H (where H = nominal fender height). Energy absorption is integrated from the Reaction v deflection curve.
Pass criteria	Fenders pass the verification performance test if low end energy (RPD -10% tolerance) is achieved without exceeding high end reaction (RPD +10% tolerance) at any point during the compression cycle

PIANC guidelines also recommend that all rubber fender units with RPD≥1000kN to be installed on monopiles, pilesupported jetties or other load sensitive structures shall be given at least one full compression cycle to stress relieve (condition) them prior to use.

1 PIANC Marcom Report of WG33 – Guidelines for the Design of Fender Systems (2002).

2 ASTM F 2192-05 Standard Method for Determining and Reporting the Berthing Energy and Reaction of Marine Fenders.

3 Testing of other fender types (Arch, Cylindrical etc) follows a similar format – please ask QuayQuip Technical Solutions for details.

4 Increased test frequency is an optional extra cost item.

QuayQuip Technical Solutions Type Approval test programme has

confirmed the factors below for angle, temperature and initial impact

speed that should be applied to Rated Performance Data (RPD) where

operating conditions differ from datum values. Values are derived

according to PIANC¹ and ASTM² recommendations.

Additionally, project specifications may require fender tolerances to be

considered. Engineering judgement and a probabilistic design analysis

should be used to assess if it is realistic for multiple worst case events to arise simultaneously.

In all cases the minimum energy absorption capacity of fenders or fender systems should be greater than the ‘Required Energy’ of berthing ships as recommendations by PIANC¹.

	Velocity Factors Rubber is viscoelastic so the faster the impact, the stiffer the material appears to be.
	Factors given are based on a linear deceleration over the full fender deflection.
	Small fenders at high impact speeds are more affected than large fenders at low speeds. In most common cases, variance to RPD is minimal and may be ignored.
	Angle Factors Performance varies according to the angle of compression. Standard angles are given, other angles may be interpolated
	Temperature Factors Rubber gets softer at high temperatures (lower energy) and stiffer when cooled (higher reaction), relative to PIANC WG33 - 2002 datum information

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