Heavy Lift Operation

Heavy lift operations are one of the critical operations that needs the combination of knowledge and experience. The most primary and basic information comes in the mind when any one talks about heavy lifting task is the weight of the lifting object. How much weight to lift? Which is the primary information needed to initiate the planning. Other contributing factors for making a lifting plan includes but not limited to Dimensions, Center of Gravity (CoG), Lifting Point etc. These informations were used to develop the lifting plan, decide on the lifting crane specification and numbers, lifting gears becomes the most important element in the lifting operation. For a Marine Warranty Surveyor or the Supercargo main challenge comes for the availability of the lifting gears. Weather the Working Load Limit (WLL) of the lifting sling is sufficient to lift the cargo.

Often stevedore and foreman have the thumb rule for using the 100t WLL sling for 100 tons cargo or they will use 200t sling combination for lifting 100 tons cargo. Thumb rule for them becomes either match the WLL of the lifting sling with the weight of cargo or double the WLL for the lifting sling. Doubling the WLL for lifting sling may looks as a safer option and more conservative approach. However, it is not practical when the cargo weights more than 100 tons and also the technical approach for finding the correct WLL sling is on the fact that how the lifting is going to be.

Is it a straight sling lift or inclined sling lift?
Lifting through the lifting lug on the cargo or lifting a basket lift.
Center of gravity or say load distribution on the lifting slings.

It is therefore become important to prepare the lifting plan, decide the lifting slings and get the review of the MWS surveyor on the lifting plan in order to take practically experience persons view on the lifting plan and the due diligence for the safety of the cargo.

An example for the lifting sling inclination factor is illustrated in image 1. Tension in the lifting sling is high when the sling inclination with the vertical axis is high and vice versa. During the single hook lifting operation it impossible to keep the sling straight. To determine the tension in the sling it become important to find the angle / inclination of the sling which depends on the length of the sling, distance between the lifting point and the center of gravity of the cargo.

Lifting calculation was then also includes the safety factors based on the dynamic accelerations, yaw effect, skew load factor. We at Constellation Marine Services use the class standard guideline from DNV-GL for lifting operations and below are the few pictures from the heavy lift operation supervised by our Marine Warranty Surveyor / Master Mariners.

Tandem crane operation for lifting Cargo Weighing 770 M tons x 60m length under our Marine Warranty Surveyor Observation.

Discharging of 1200 M tons x 48m length Pressure Vessel under Observation of our Marine Warranty Surveyor.

We constellation marine services have the experience marine warranty surveyor and team of engineers to complete the combination of technical knowledge and field experience for successful completion of the task.

Team Constellation a highly professional Team Constellation a highly professional Team Constellation a highly professional Team Constellation a highly professional Team Constellation a highly professional Team Constellation a highly professional Team Constellation a highly professional & experienced Master Mariners, Naval Architects, Tanker Masters, Engineers, Consultants, Marine Asset Valuers and a team of Qualified Surveyors with expertise and experience in different areas of marine activities offering round the clock services to the clients in shipping and insurance industry with direct presence at all sea ports in UAE and with offices in Dubai, Abu Dhabi and Fujairah just a call away from these ports. Constellation has international offices in UK and Singapore and associates all over Middle East and UAE, London, Holland, Germany, West Africa, Cape Town, Oman, China, Singapore. Survey, Inspection,investigation Risk and Root Cause Analysis Load Test of Lifting Gears Certification Mrine & Insurance Clam Consultancy Vessel Valuation Dry Cargo Bulk Break Bulk Project Cargo Dry Container Survey Draught Survey Pre-shipment Condition Pre-shipment Condition Pre-discharge Condtion Pre-dischsrge Condition Stuffing Unstuffing Stow Cargo Damage Surey Loading Discharging Survey Taly Cagrgo Container Damage Sampling & Analysis Damage Short Landing Survey Dangerous Cargo Survey Pre-shipment Condition Stowage Plan Preparation Reefer Container Short Landing Investigation Cargo Hold Inspection Truck Inspection Lashing & Securing Certification Pti Inspection Survey Loading off Loading on Board Stowge Supervision Container Condition Survey Supervision Uld Inspection of Hatch Covers Temp Set. Vent Inspection Cargo Hold/hatch Inspection Cargo Land Transportation Stuffing Unstuffing Stow Weighment Witnessing Cargo Damage Investigation Reefer Cargo Damage Survey Sealing/unsealing Short Landing Investigation Reefer Cargo Damage Investigat Bunker Survey Petroleum On Hire/off Hire Rob Survey Vessel Tank Inspetion and Certification On Hire Off Hire Bunker & Condition Survey. Petrolem Prduct Quantify Survey Sampling & Sealing Prduct Loading Dischrging and Sampling Witnessing Sample Lab Analysis. Cargo Contamination Investigation Magnetic Compass Adjustment & Deviation Card Hull & Machinery Damge Survey Sts Operation Ism, Isps and Mlc Audits Project Cargo Transportation Loading discharging Marine Warranty Surveys Project Management & Decommissioning Supervision for Off Shore Structures Rig Moves, Location Approvals and Off Shore Warranty Inspection Prior & During Moves. Heavy Cargo Lifting Plan Review, Preparation of Stowage& Lashing Plan Towing Arrangement Plan and Tow Approvals. Collision Damage Survey, Repair Cost Estimation and Investigation P&i Pre-entry Vessel Conition Surveys Hull & Machinery Conditon Surveys Root Cause Analysis of Maritime Accidents. Issuance of Charterd Engineer Certificate for Export Machinery. Valuation Pre-purchase Conditiion Surveys & Sea Trials Marine Vessel Condition Inspection&valuation Vessel Valuation. Valuation Marine Asset, Machinery& Equipment Constellation Marine is managed by four board members UK, connected with various facets of the marine business like Maritime Law & Marine insurance individually. Constellation Marine Surveyors & Consultants are independent and professional in every of our conduct. take up appointments for ship owner, trader or insurance companies Constellation Marine has registered offices in UK, Singapore and Middle East specializing in Maritime and energy claims, offshore marine warranty inspection, ship and cargo inspections for principals, insurance companies and charterers and P&I Clubs as our main principals instructing us repeatedly global company with branches in Dubai, London, Singapore, Abu Dhabi, Fujairah, Ras Al Khaimah, Bahrain, Kuwait, Qatar, Oman, Yemen Liason offices at Germany, Holland, China, west South Africa.

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Heavy Lift Operation - Know your lifting gears