Offshore Container Examination: Health and Safety

• The revision test is part of the Offshore Container Examination Advanced Programme.
• The objective is to achieve 60% or more correct answers for the test, which indicates your level of knowledge and understanding.

Module 1

• Key reasons for health and safety legislation: Moral, Legal, Financial.
• Section 6 of the Health and Safety at Work etc. Act 1974, as amended 1988, requires that suppliers provide information on the safe use of their products.
• The four primary elements of competency include Information, Instruction, Training, and Supervision.
• Five steps to risk assessments: Identify, decide, evaluate, record, and review.
• A hazard has the potential to cause harm.
• The 'essential safety requirements' for new lifting equipment are defined in the Supply of Machinery (Safety) Regulations 2008.

Machine Definition

• An assembly is an object fitted/intended to be fitted with a drive system (excluding directly applied human/animal effort), consisting of linked parts, with at least one moving part, joined for a specific purpose.
• Regulation 6 of PUWER concerns inspection.
• Employers can check an offshore container's compliance with regulations through the Declaration of Conformity.
• Regulation 9 of LOLER concerns thorough examination and inspection of lifting equipment.

Module 2

• Harmonised European Standards under European Directives are recommended.
• BS 7072 is a withdrawn standard that applied to containers manufactured prior to 1999.
• BS EN ISO 10855-3: 2018 specifically concerns lifting set design for offshore containers

Module 3

• Shown container classification: Open.
• Secondary structure component: Door
• Tare mass equals the mass of the empty container (excludes lifting set and cargo)

Module 4

• Offshore container designed to withstand minimum significant wave height during loading/unloading: 6m.
• Highest design temperature allowed for an offshore container: -20°C.
• Corner posts minimum material thickness for a container where R=5000kg: 8mm.

Welding and Design Strength

• Essential primary structural members should be welded with full penetration welds.
• Container doors should be designed to withstand a minimum of 125% of the horizontal force design strength of the primary structure.
• Lashing points within general cargo containers will each be designed to withstand a force of at least 15 kN.

Tank and Frame Clearances

• The minimum internal dimensions for container forklift pockets are 200 mm x 90 mm.
• Absolute minimum clearances: Top = 150mm, bottom = 150mm.

Module 5

• Allowable manufacturing tolerance for pad eye alignment: ±2.5%.
• The maximum pad eye hole size = 106% nominal shackle pin diameter.
• DNV 2.7-1 thickness requirement for a pad eye at the hole is 125% inside shackle width.

Module 6

• The band of solid colour around the closed container's roof perimeter must be 100mm wide.
• Container number lettering size marked on all sides of the container = 300mm.
• Fabricator's serial number's welded marking has a minimum height = 50mm.

BS EN ISO 10855-1

• The text height on a BS EN ISO 10855–1 container marking plate requires characters of at least 6mm.
• Fabricator's serial number is not a mandatory inclusion for a BS EN ISO 10855–1 container data plate.
• BS EN ISO 10855-3 container inspection plate provision: minimum of 9 inspections.
• The standard number is not required when marking a BS EN ISO 10855-2 chain sling lifting set.

Module 7

• Load cells for offshore container testing: annual calibration, ± 1% accuracy.
• Personnel performing container lifting tests, once container is clear of the ground, must clear the area of unauthorized persons before measurement.
• All-point container lifting test loading = 2.5 x MGM.

Vertical Impact Test

• Minimum drop height and impact speed = 50mm and 1m/second during vertical impact tests

Module 8

• Short link chain pitch to size ratio for lifting = 3:1 (BS EN 818).
• Tempering temperature for heat treatment = 400°C (BS EN 818-2).
• Manufacturer's proof force for chain = 2.5 x WLL (BS EN 818-2).

Chain Sling Tolerance

• Grade 8 medium tolerance short-link chain mean stress = 800 N/mm².
• EN 818-4 prescribes 5mm/m tolerance between the shortest and longest legs when constructing a chain sling with legs over 2m joined by welding.

Offshore Container Lifting

• The max offshore container lifting sets design angle: 60°.
• WLL calculation: 2 x WLL for a single leg x cosine angle to the vertical for a 4-leg chain sling under BS EN 818-4.
• "The grade mark shall be the number for medium tolerance chain designating the grade of chain. It shall be legibly stamped or embossed on every 5th link or intervals of 1 metre, whichever is the greater distance.
• Reduction in working load limit: According to BS EN 818-6, the reduction in working load limit of a grade 4 welded chain sling = 25% of the WLL.

Module 9

• 6x36 wire rope strand: 36 wires.
• Strand Construction: Thomson construction is not a recognised wire rope strand construction?

Wire Construction

• The image shows Filler strand construction.
• The wire construction rope lay can be used to construct this rope: Right hand ordinary lay
• A rope designation code does not include length.
• Advantage of zinc coating: improves corrosion resistance.

Wire Rope

• EN 13414-1, wire rope diameter 15mm: minimum distance between ferrule secured ends -> 300mm.
• The WLL of an intermediate link = 2 x WLL of single connected leg
• Effective length is not a marking requirement for single-leg wire rope sling tags.
• Multiple Leg Slings: WLL use factor adjustment: 2/3.

Module 10

• A shackle under point loading is subject to single shear.
• A screw pin may become loose due to vibration, which is a disadvantage over other types.
• Heat treatment form: Hardened and tempered in accordance with BS EN 13889.

Shackle Visual Examination

• BS EN 13889: Visual examination quantity for shackles when quality system to ISO9001 is operated to every shackle in the batch
• Shackle pins in diameter that should be marked: 13mm.
• Correctly fitted shackle pin condition: double shear.
• Crack found in shackle examination: Remove from service.

Module 11

• Minimum WLL required = 5.25t
• Wire rope in BS EN ISO 10855 offshore containers = 6 x 19, 6 x 25 and 6 x 36
• Recommended internal dimensions of a lifting set = 270mm x 140mm
• Master Height: 1.3m

Permitted Tolerance and Enhancement Factor

• Permitted tolerance: -1% to +3%
• Fixed enhancement factor for containers BS 7072: 1.5 x MGM

Module 12

• 2 x MGM proof load test: initial certification.
• IMDG code periodic tank inspection requirement = Every 30 months
• Repairs and details: Inspection body responsibilities are the repairer
• Periodic inspection plates: TNV should be added onto periodic inspection plates for offshore containers if a proof load test, NDE, and visual examination have been done.

Module 13

• Non-destructive examination: intervals > 12 months
• Load tests on containers per BS 7072 are according to The Standard.
• DNV 2.7.1 sling components undergo NDE or load testing: after significant repair or modification.

Question 80-82

• Master link wear = Less than 8% of diameter
• The max number of adjacted broken outer wire: 3
• Max allowable chain sling elongation: 0%

Module 14

• Eddy current testing advantages for container welds = It can be used on painted welds.
• Deflection allowance: the deflection allowance amount during a container lifting test can be determined as 1/300 of the beam

Container Testing

• Periodic Offshore container examination test = Charpy impact testing
• Chain sling leg test load per BS EN ISO 10855-3 = 2.5 x WLL +/-1%
• Chain sling leg test load per DNV 2.7-1 = 2.5 x WLL +/- 2%

Module 16

• Listed item not on a container inspection list: Confirmation that the container data plate was marked with the inspection date

Module 17

• Party responsible is The owner.

Revision test on health and safety legislation, risk assessment, and lifting equipment safety. Covers Section 6 of the Health and Safety at Work Act 1974 and the Supply of Machinery (Safety) Regulations 2008. Focuses on elements of competency and hazard identification.