The present Recommended Practice was released to provide applicable criteria as well as technical requirements and necessary guidance related to the quality management of the steel forgings that are applied for subsea construction. The content of the document is actually intended for general application worldwide. Note that the various governmental regulations might include some additional requirements.
The recommended practice will provide international and harmonized standard for the quality management as mentioned above, reduced lead time and increased confidence, improved stock keeping of the steel forgings and their interchangeability. Another aim is to simplify the whole process of the quality management and also avoid duplication of the associated activities.
The document will serve as a sort of contractual reference document. The material of the document is arranged in five major sections covering the general information, requirements applicable to the qualifying companies/personnel, qualification of the manufacturers, production of steel forgings and procedure qualification. There are numerous appendices with some additional information.
The present DNV GL standard was developed to provide technical requirements applicable to the certification and verification of shipboard cargo gear used for handling loads both outside and within ships while in sheltered waters or at sea or in the harbor. The content of the document is covering the design of the lifting appliances and materials used for their construction, installation of the cargo gear, their testing and commissioning.
All lifting appliances have been categorized based on their installation and function - there are shipboard and industrial lifting appliances. The main intended purpose of the lifting appliance will be defining the applicable category and standards. Note that the requirements provided in the pages of this document are minimum requirements that shall be satisfied; however, subject to acceptance by this Class Society, other minimum requirements may be developed based on the new technologies and their application agreed.
The material of the document is arranged in several sections covering documentation and certification requirements, cranes and their supporting structures, mechanical parts of the cargo gear, loose gear, electrical equipment, principles of design and calculation, testing of the cranes, their examination and other important matters.
The present standard was released by DNV GL to provide requirements for certification/verification of the lifting appliances that are intended for handling loads outside ships at sea and on board ships and offshore installations. The document is covering the design and materials, fabrication and installation, testing and commissioning of the offshore and platform lifting gear.
The book starts with the general information on the lifting appliances and their categorization, followed by the section addressing documentation and certification of cranes. The structural design and strength issues have been dealt with in a separate section.
The main part of the document covers safety matters and equipment, offshore and platform cranes, subsea operations, lifting of personnel, LARS, i.e. launch and recovery systems for ROV and diving, testing requirements and other information.
There are several appendices providing additional information, such as marking of the single sheave crane blocks, instruction on the examination of the skids and pad eyes, wind loads to be considered, verification guidelines for safety functions, lifting gear register form, certificate forms etc.
The China Register Rules for materials and welding commonly applied in construction and repair works. The content of the rulebook is arranged in three major parts. The first part is dealing with the metallic materials including general provisions, survey and testing requirements, material tests - tensile, impact, bend, z-direction tensile tests, ductility and others, steel plates, flat steel bars and sections, steel castings and forgings, tubes and pipes, aluminum alloys, iron castings, non -ferrous materials, shipboard equipment - anchors, chain cables, wire ropes, mooring chains etc.
The second part is covering non-metallic materials such as plastics and FRP, concrete, skirt materials, and fiber ropes. The last part of the book has been devoted to welding including welding consumables, approval of the procedures welding of ship hull structures, welder qualification tests, welding of various offshore structures, pressure shells, pressure pipes, submarine pipelines, and machinery components.
Particular attention has been paid to the welding and riveting of various non-ferrous materials such as aluminum and titanium alloys, marine copper and alloys. The archive includes two files with the amendments.
The present DNV GL released recommended practice contains official recommendations to be considered when performing strength analysis of the main structures of jack-up offshore units. The hull of the modern self-elevating platform usually rests on three or four legs, commonly vertical. Some special designs feature tilted legs - this is done to provide higher stability when the unit is elevated.
A drilling slot is normally cut in the aft side of the main deck, however some designs have the drilling derrick cantilevered over the unit's side. There are two bottom support concepts. Most of the self-elevating units have separate legs supported by the spud cans while other rigs have their legs connected to a huge mat preventing excessive penetration.
The present document will provide general information on the design features of the jack up rigs including general principles and stress design. The authors have paid attention to the environmental conditions to be taken into consideration as well as the design loads including deformation, environmental and accidental loads, global response analysis, structural strength and fatigue strength, accidental strength dealing with the damaged condition of the structure, stability analysis and requirements to the air gap. In the appendix you will find the simplified model of the lattice leg.
These China Register Rules have been published to apply to the vessels equipped with the LNG containment and bunkering system. The sea-going liquid natural gas bunkering vessel shall comply with all rule requirements. For the vessels featuring the function of bunkering the fuel oil with a flash point exceeding 60 degrees and LNG, the associated cargo areas shall be complying with the oil tanker requirements.
The design of the vessel, in turn, shall be fully compliant with the water environmental conditions and the operational conditions shall be duly reflected in the ship's safety operation manual. The materials used for construction of the gas tanks, equipment used for bunkering, piping and fitting, and any other part contacting LNG or the boil-off gas shall be suitable for the specified pressure and temperature.
In addition to the requirements listed in this rulebook, the materials shall also comply with all relevant requirements of the other rules. Seven chapters of this rule book are covering general provisions, the vessel's arrangements, cargo containment systems, bunkering systems, power installation, shipboard monitoring, alarm and safety systems, electric equipment and fire safety including protection and extinction arrangements.
The content of this recommended practice is dealing with the risk based abandonment of the wells drilled offshore. The offshore wells being drilled commonly need permanent abandonment to get the subsurface pressure duly controlled and also to prevent the pore fluids from free flowing to the sea floor. The purpose of the so-called P&A standing for the plug and abandonment of the offshore wells is protection of the environment; of course, all safety standards are to be maintained.
The wells to plug and abandon offshore vary. Some of them require less complex plug and abandonment operations - they can normally be plugged using the simple P&A solution or existing drilling equipment of the platform. The other wells will require a rig capable of handling heavier P&A operations that, in turn, may require casing, tubing, milling, cement repairs etc.
The older wells sometimes lack basic documentation and paperwork required for the plug and abandonment - this is especially a case if this well has changed the owner. The main objective of this publication is to provide industry with the effective risk-based framework to be applied to the design of the well abandonment and is therefore a needful one for the offshore workers.
The Rules developed and published by China Register for the lifting appliances installed on bard vessels and offshore units. The provisions of the present rulebook shall apply to the derrick rigs/cranes, submersible handling systems, crew/passenger lifts, conventional cranes, cargo/vehicle lifts. The publication opens with the general information about the survey and certification system including plans and documentation.
The main part of the book is dealing with the derrick systems including calculations of the loads and conditions, shipboard and offshore lifts, cranes and ramps covering heavy lift cranes as well, relevant machinery and electrical installations - note that this sections also covers control engineering systems. The materials and welding have been paid particular attention together with the testing of the shipboard/offshore lifting appliances.
The last chapter of the volume addresses the marking of lifting gear and lifting machinery. There are four appendices to the main body of the document providing information on the critical stress normally experienced by the compressed construction members, derrick fittings, ILO 32 and ILO 152 ratification status, and forms of the register of lifting appliances issued to the CCS classed vessels.