Marine mooring bollards provide a simple yet efficient method for fulfilling mooring requirements to allow safe securing of vessels next to jetties, wharves, berths and dolphins in ports and harbours. ESC can offer a wide range of cast iron or steel bollards in various sizes, grades and capacities.
ESC bollards are designed and manufactured in accordance to various international standards such as BS 6349 pt 4 and PIANC guidelines. Bollards are safety critical components and ESC strives to provide bollards with superior service life and resistance to physical and corrosive environments.
ESC bollards are produced to the highest specifications. The table gives indicative standards and grades but many other options are available on request.
Ductile Cast Iron
BS EN 1563 - Grades EN-GJS-450 to 500
ASTM A536 - Grades 65-45-12 to 8-55-6
GB/T 1348 - Grades QT450-10 to QT600-3
ASTM A148 - Grades 65-35 to 80-50
ISO 1030 - Grades 230-450 to 340-570
GB/T 11352 - Grades ZG230-450 to ZG340-640
BOLLARD SELECTION & LAYOUT
Bollards should be designed and laid out according to local standards. Some of the following aspects are to be considered in the design of the berth:
Mooring patterns and line types, sizes and angles
Changes in draft during loading/unloading of the vessel
Wind and current forces
Swell, wave and tidal forces
Other abnormal environmental loading
Mooring loads should be calculated where possible, but the following table can be used as an approximate guideline, also noting that if the berth is expected to experience adverse weather conditions, the bollard capacity should be increased by 25% or greater.
ESC bollards can cope with horizontal angles of ± 90° (except for pillar bollards which is in all horizontal angles) and vertical angles up to 60° depending on bollard type.
Design codes recommend that bollards are frequently placed at 15-30m intervals, often at the same spacing as fenders (either at the same point as fenders or midway). Another approximate guide is 15% of the length of the shortest ship.
Ship Displacement - Bollard Size
Up to 2000 tons - 10 tons
2000 - 10000 tons - 30 tons
10,000 - 20,000 tons - 60 tons
20,000 - 50,000 tons - 80 tons
50,000 - 100,000 tons - 100 tons
100,000 - 200,000 tons - 150 tons
Over 200,000 tons - 200 tons
Bollards are supplied as factory standard with a protective coating suitable for most projects. High performance epoxy or other specified paint system can be factory applied on request in a choice of colors and thicknesses. Standard available coatings include (uncoated, zinc oxide primer or high performance epoxy).
Bollard are also available and supplied with Hot Dip Galvanized (HDG) on special request basis. Wear and abrasion from ropes means paint coatings need regular maintenance. Ductile iron bollards are far less susceptible to corrosion than cast steel bollards, which can rust quickly and will need frequent painting to retain full strength.
Bollards must be installed correctly for a long and trouble-free service life. Anchors should accurately be installed with a template of the bolting pattern, which ESC can supply on request. Once the grout has cured to full strength, anchors can be tightened to the design preload. A thread loosening compound is frequently applied to allow future removal for replacement. Where possible, recessing the bollard in the concrete is more beneficial than surface mounting.
Fixing options for bollards include:
Bollards are safety critical items and quality is paramount. Independent third party witnessing of test is available at additional cost on request. A typical quality documentation package will include:
Dimensioned drawings of bollard and accessories
Bollard and anchorage calculations (if required)
Inspection and test plan
Certificate of conformance
Physical, chemical and material properties report for casting and anchorages