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A bulk container is a specialized type of shipping container designed for transporting loose, unpackaged bulk cargo such as grain, feed, spices, powders, or other granular materials. Unlike standard dry containers, bulk containers feature unique loading and unloading mechanisms to facilitate the efficient handling of bulk goods.
Key Features of Bulk Containers
Common Uses of Bulk Containers
A Specification for 20ft bulk Container as below for reference.
1.General
1.1 Scope
This specification will cover the design, construction, materials, testing and inspection performances of 6058X2438X2896 bulk containers.
1.2 Standard and Regulations
The containers must be designed and manufactured under sufficient quality control in
order to comply with following authorized classification societies, standards and
regulations.
1.2.1 American Bureau of Shipping (ABS),
Korea Classification Society (K.R.)
Bureau Veritas (BV),
Germanischer Lloyd (GL),
Lloyd Register of Shipping (LR)
1.2.2 ISO/TC-104
668 – Dimensions and Ratings. (4th Edition-1988/Amd.1-1993)
6346 – Coding, Identification and Marking. (1995 edition)
1496/ 4 – Specification and Testing.
Part 4: Non-pressurized Containers for Dry Bulk (1996 edition)
3874 – Freight containers, Handling and Securing. (4th Edition-1988)
1161 – Specification of Corner Fittings. (1984 Edition)
1.2.3 T.I.R. : Approved by an authorized classification society.
1.2.4 C.S.C. : In compliance with “International Convention for Safe Containers” and
approved by an authorized classification society.
1.2.5 Classification Society: Under sufficient quality control of the above mentioned classification societies and certified by an authorized classification society.
1.3 Handling
The containers will be constructed to be capable of being handled without permanent deformation on following basis.
1.3.1 Lifting, loaded or empty, at top corner fittings vertically by means of spreaders fitted with hooks, shackles or twist–locks, regardless of any port crane speed.
1.3.2 Lifting, loaded or empty, at bottom corner fittings using slings with terminal fittings at any angle between vertical and 45 degrees to the horizontal.
1.4 Transportation
The containers will be constructed to be suitable for transportation in normal operation condition and in the following modes.
1.4.1 Marine : Nine (9) high stacked (on a level 24,000kgs ratings) in the ship cell guide and
Four (4) high stacked and secured by suitable vertical and diagonal wire lashings on the vessel deck
1.4.2 Road : On flat bed or skeleton chassis, secured by twist–locks or equivalent ones at the bottom corner fittings.
1.4.3 Rail : Suitable for rail transport under following modes.
– COFC (Container-on-flatcar): secured by twist–locks or equivalent.
– Double stacking on the train.
– TOFC (Trailer-on-flatcar): secured to semi-trailer chassis.
a) Lifting, full or empty, at top corner fittings vertically by means of spreaders fitted with hooks, shackles ortwist–
b) Lifting, full or empty, at bottom corner fittings using slings with terminal fittings at any angles between vertical and 45 degrees to the horizontal.
2. DESIGN DATA
2.1. External Dimensions
Length 6,058 +0,-6 mm ( 20’ +0/-1/4” )
Width 2,438 +0,-5 mm (8’ +0/-3/16”)
Height 2,896 +0,-5mm (9’ -6” +0/-3/16”)
2.2. Internal Dimensions (Nominal)
Length 5,820 +0,-6mm (19’ – 1 9/64” +0/-1/4”)
Width 2,350 +0,-5mm (7’ -8 1/2” +0/-3/16” )
Height 2,675 +0,-5mm (8’ -9 23/64” +0/-3/16”)
2.3 Cubic Capacity 36.5 m3 (1,288 ft3)
2.4 Rear Personal Door Opening (Clear Opening)
Width 948 +0,-5mm （3 ’ – 1 5/16” +0/-3/16”)
Height 1,989 +0,–5mm (6‘ – 6 5/16” +0/-3/16″ )
2.5 Discharge hatch Opening (Clear Opening)
Width 2,000 +0,-5mm （6 ’ – 7 3/4” +0/-3/16”)
Height 360 +0,–5mm (1‘ – 2 3/16” +0/-3/16″ )
2.6 Weights & Ratings
Max. Gross Weight (R) 30,480 kg (67,200 lb)
Tare Weight (T) 2,680 kg (5,910 lb)
Payload (P) 27,800 kg (61,290 lb)
2.7 Forklift pocket dimensions (Nominal)
Width 360 mm ( 1′ 2 11/64″ )
Height 116 mm ( 4 23/32” )
Center distance 2,050 mm ( 6′ 8 23/32” )
3. CONSTRUCTIONS & MATERIAL
3.1 Floor
The floor is composed of cross–member ，floor plate and bottom side rail.
Bottom side t4.0mm thick, Corten steel
Floor Plate t24mm thick, plywood boards
Cross-member t4.0 thick, Corten steel
Folk lift pocket top plate t4.0 thick, Corten steel
Folk lift pocket bottom plate t6.0 thick, Corten steel
3.2. Roof
The roof is composed of several Corten steel corrugated panels welded together .
3 corten steel roof hatches ( dia. 500 mm ) incorporated
Roof t1.8mm thick, Corten steel plate with corrugation.
Support tube 50x25x2.0 mm thick rectangle hollow section steel
3.3. Side Wall
The side wall is composed of several Corten steel panels welded together .
Top Side Rail 60x60x3.0 mm thick rectangle hollow section steel.
Side outer Panel t1.8mm thick, Corten steel
Side inner Panel t9.0mm thick, plywood
3.4 Front Frame and Door
The front frame is composed of Corten steel frame and front panel . A discharge hatch is located at lower position which are to be installed on the front frame.
Front Header t4.0mm thick, Corten steel
Front Sill t4.0mm thick, Corten steel
Front Outer Corner Post t6.0mm thick, Corten steel
Front inner Corner Post t3.0mm thick, Corten steel
Front outer Panel t2.0mm thick, Corten steel
Front inner t9.0mm thick, plywood
Door frame 100x50x4.0 mm thick rectangle hollow
Discharge Door outer Panel t2.0mm thick, Corten steel
Discharge Door inner Panel t2.0mm thick, Stainless steel
Gasket: E.P.D.M. “C” section double lips.
Locking rod assembly BE 2566MN
Rear end wall is composed of Corten steel frame and door. The rear door is composed of Corten steel door panel and Corten steel door frame welded together.
A personal door is arranged at right position .
Rear Header t4.0mm thick, Corten steel
Rear Sill t6.0mm thick, Corten steel
Rear Outer Corner Post t6.0mm thick, Corten steel
Rear Inner Corner Post t3.0mm thick, Corten steel
Door frame 100x50x4.0 mm thick rectangle h
Door outer Panel t2.0mm thick, Corten steel
Personal Door inner Panel t9.0mm thick, plywood
Gasket: E.P.D.M. “C” section double lips.
Locking rod assembly BE 2566MN
4.PRESERVATION
4.1 Exterior:
4.1.1 Exposed parts of steel CORTEN structure
Shop primer: Zinc rich 10 microns.
Primer: Zinc rich Epoxy Primer HEMPADUR ZINC 15360 30 microns.
Primer: Zinc phosphate Epoxy HEMPADUR 15300
HMP colour shade 11150 (RAL 7035) 40 microns
Top coat: Acrylic top coating RAL 9011 50 microns
Total dry film thickness 130 microns.
4.1.2. Underside of plywood structure ( Exposed parts of plywood structure)
– Primer: varnish top coating (RAL 3007) – 120 microns
4.2 Inner surface:
4.2.1 Inner parts of steel structure( Exposed parts of roof plate (steel structure)
Shop primer: Zinc rich 10 microns.
Primer: Zinc rich Epoxy Primer HEMPADUR ZINC 15360 30 microns.
Primer: Zinc phosphate Epoxy HEMPADUR 15300
HMP colour shade 11150 50 microns
Primer: top coating
(roof with Grafo Therm moisture absorbing paint ) 600 microns Total dry film thickness 690 microns.
4.2.2 Inner parts of plywood structure( Exposed parts of plywood structure)
Primer: varnish top coating (RAL 3007) 120 microns
5.Marking
All containers are to be marked in accordance with ISO and owner’s specifications；
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