GB/T 35989.1-2018Petroleum and natural gas industries -- Floating offshore structures -- Part 1: Monohulls, semi-submersibles and spars (English PDF)

Foreword

GB/T 35989 "Oil and Natural Gas Industry Floating Structure" is divided into two parts.

--- Part 1. Monohull, semi-submersible platform and deep draft column platform;

--- Part 2. Tension leg platform (TLP).

This part is the first part of GB/T 35989.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part uses the translation method equivalent to ISO .19904-1.2006 "Oil and natural gas industry offshore floating structure Part 1. Monomer

Boat, semi-submersible platform and deep draft platform.

This part is proposed and managed by the National Oil and Gas Standardization Technical Committee (SAC/TC355).

This section drafted by. CNOOC Research Institute.

1 Scope

This part of GB/T 35989 specifies the design of offshore floating structures used by offshore oil for drilling, production, storage and external transmission functions.

Calculate and evaluate technical requirements.

This section applies to three types of steel floating structures of monohull, semi-submersible platform and deep draft column platform.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 20660-2006 Requirements and guidelines for fire, explosion control and mitigation measures for offshore production units in the oil and gas industry

(ISO 13702.1999, IDT)

GB/T 23511-2009 General requirements for marine structures in the oil and gas industry (ISO .19900.2002, IDT)

ISO .19901-1.2005 Particular requirements for the marine structure of the oil and gas industry - Part 1

(Petroleum and naturalgasindustries- Specificrequirementsforoffshorestructures-Part 1.

Metoceandesignandoperatingconsiderations)

Petroleum and natural gas industries -- Particular requirements for marine structures - Part 7

Structure positioning system (Petroleum and naturalgasindustries-Specificrequirementsforoffshorestruc-

tures-Part 7.Stationkeepingsystemsforfloatingoffshorestructuresandmobileoffshoreunits)

ISO .19902.2007 Oil and gas industry fixed marine steel structure (Petroleum and naturalgasindustries-

Fixedsteeloffshorestructures)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1

Abnormal abnormal

Exceeding the normal design conditions, it is different from the minimum probability event.

3.2

Accident accidental

The structure or its affiliates are subject to accidents or abnormalities.

For example. impact, fire, explosion, partial failure or the pressure difference in the design disappears (eg buoyancy).

3.3

Action action

Structural external loads (direct effects) or factors that can cause deformation or acceleration factors (indirect effects).

For example, manufacturing errors, installation, seating, temperature changes, or humidity changes can cause structural deformation.

Note. Earthquake effects usually produce acceleration.

3.4

Action combination actioncombination

In the structural design check, a combination of different effects simultaneously applied to the structure in a specific limit state.

3.5

Action effect

The effect produced by the action of the structural members.

For example. internal forces, bending moments, stresses, strains, rigid body displacements or elastic deformations.

3.6

Air gap airgap

The gap between the highest point of the water surface in an extreme marine environment and the lowest point in the design that is not subject to the structure of the wave impact.

3.7

Basic parameter basicvariable

One of a series of parameters that characterize physical properties such as action, environmental impact, geometry, material properties, and soil properties.

3.8

Eigenvalue

A value inherent to a particular underlying variable, effect, or strength model that is not affected by other influencing factors.

Note. For a function and its corresponding characteristics, the eigenvalue is usually related to the period.

3.9

Design criteria designcriteria

Under each extreme operating condition, describe the formula or criteria that are required to meet the conditions.

3.10

Design form designformat

A mathematical expression for checking to verify that the limit state is not exceeded.

Note. In this section, the working stress method (WSD) and the partial coefficient method can be used.

3.11

Design service lifedesignservicelife

The expected life of a structural or structural component, provided that it can be implemented. Within this period, the structure can be allowed to enter

Maintenance, but no major repairs are required.

3.12

Design condition designation

A set of physical conditions in the structural design that do not exceed the limit state during a certain recurrence period.

3.13

Design value designvalue

The value of the underlying variables, effects, or strength models used in the design verification process.

Note 1. For the limit state (ULS) design check method based on the partial coefficient form, the design value of the strength variable or model can be divided by its typical value by the partial system.

The number is obtained and the design value of the action can be obtained by multiplying its typical value by the partial coefficient.

Note 2. For the fatigue limit state (FLS) based on the partial coefficient form, the normal operating limit state (SLS) or the accidental limit state (ALS) design checker

Method, all the partial coefficients take 1 and the design value is equal to the typical value.

Note 3. For any calibration method based on the working stress method, all the partial coefficients are taken as 1, and the design value is equal to the typical value. Approximate overall safety

The coefficient or the coefficient is used for design verification.

Note 4. For effects and related characteristics, the value can be related to the return period.

3.14

Dynamic action

The magnitude is large enough to cause structural or structural components to produce acceleration effects that require special consideration.

3.15

Dynamic positioning dynamicpositioning; DP

Dynamic positioning technology refers to the technology that mainly uses the ship's own propeller system for positioning. The propeller is resisted by generating thrust.

Often or slow drifting.

3.16

Exposure level exposurelevel

A grading system that determines structural requirements based on life safety, environmental, and economic consequences of structural failure.

3.17

Failure failure

Insufficient strength or incomplete function of structural or structural components or failure to meet their limit state requirements during structural verification.

3.18

Adaptive fit-for-purpose

Although the standard requirements for locality are not met, the design intent of the standard ensures that failure of the area does not result in failure.

Accepted life safety consequences or environmental hazards.

3.19

Floating structure floatingstructure

A structure in which all weight can be supported by buoyancy.

Note. All weights include empty ship weight, pre-tension of mooring system, riser pre-tension and operating weight.

3.20

Freeboard freeboard

The vertical distance between the upper deck of the hull (or the top of the continuous structure) and the average water surface for a given draught condition.

3.21

Shanglang greenwater

The waves romantically cross the deck, causing slamming and pressure on the deck structure.

3.22

Limit state limitstate

After the structure is exceeded, the structure no longer meets the design criteria.

3.23

Mobile movable drilling unit mobileoffshoredrilingunit;MODU

The structure of drilling and workover operations can be carried out during the exploration and development of subsea oil.

3.24

Marine mobile device mobileoffshoreunit; MOU

A structure that can be moved to different sea areas to perform its specific functions.

3.25

Monohull monohul

A floating structure consisting of a single continuous casing, similar in shape to sea vessels, barges, etc.

3.26

Nominal value

The values of the underlying variables, effects, or strength models determined based on non-statistical methods are usually obtained based on empirical or actual conditions.

For example. the values given in a recognized standard or specification.

3.27

Owner owner

Representatives of single or multiple companies with development rights may represent the parties with joint development rights as operators.

3.28

Platform platform

A complete structure consisting of a structural body, an upper block, a lower foundation, or a positioning system, if any.

3.29

Well-known classification society recognizedclassificationsociety; RCS

Member of the International Association of Classification Societies (IACS), with recognized qualifications and experience in the field of floating structures, and developed for oil or day

The classification/inspection certification procedures and procedures for the production of activity facilities (these facilities are located at a particular location for a long period of time).

3.30

Reliability

The ability of a structural or structural component to meet specified requirements.

3.31

Typical value

The value of the underlying variable, action, or strength model used to check a limit state.

Note 1. Typical values can be equal to eigenvalues, nominal values or other reasonably determined values.

Note 2. For the effect, the typical value may be related to the higher or lower eigenvalue, and the value depends on which condition causes the condition to be more unfavorable. Combination should

In the process, you can multiply the coefficient by more than or less than 1.

3.32

Resistance resistance

The ability of a structure, component, or component section to withstand effects and not exceed a limit state.

3.33

Return period returnperiod

The average time interval between occurrences of an event or the average time interval over which a particular value is exceeded.

Note. The ocean engineering community usually uses years to measure the return period of environmental events. The return period measured in years is equal to the reciprocal of the probability of occurrence beyond the year of the event.

3.34

Riser riser

A pipe that connects a treatment facility or drilling equipment on a floating structure to an underwater facility, a subsea pipeline, or an oil reservoir.

Note. Possible functions of the riser include drilling and workover, production, injection, underwater system control, and oil and gas transportation.

3.35

Robust robustness

The ability of the structure to resist events occurring at a reasonable probability level, ie the structure does not cause disproportionately serious damage due to a certain

as a result of.

Note. Possible causes such as fire, explosion or collision.

3.36

Semi-submersible platform semi-submersible

A floating structure usually consisting of a deck structure, some large-span large-section support columns, and underwater buoys connected to the columns.

Note. Reasonable selection of the geometry of the pontoon/column can reduce the overall motion response of the platform under a wide range of wave loads.

3.37

Slamming slamming

Part of the structure has an impact with high pressure peaks when it collides with water.

Note. Sniping may be caused by water in the lower part of the hull or due to wave slap on the structural components.

3.38

Sloshing

The impact of fluid movement in a non-full load tank on the bulkhead.

3.39

Deep draft column platform sparplatform/spar

An upright single-column platform with a deep draft (drinking more than 100m).

3.40

Special area specialareas

A particularly important area identified by the designer that affects structural integrity and safety.

3.41

Stability

Hydrostatic stability

The floating structure produces a returning moment that deviates from the equilibrium position to return the structure to an equilibrium state.

3.42

Static action

Does not cause significant acceleration effects of structural or structural components.

3.43

Positioning system stationkeepingsystem

A system capable of limiting the offset of the floating structure within a prescribed range.

3.44

Structure

A combination of components designed to withstand and provide sufficient stiffness.

3.45

Structural component

A physically distinguishable structural part.

3.46

Structural system

A combination of structural members that work together.

3.47

Upper module topsides

A collection of structures and equipment that are placed on a support structure (fixed or floating) to provide some or all of the platform's functionality.

Note. For a monohull, the deck is not part of the upper module.

3.48

Variable action

The effect that the amplitude varies with time compared to the mean cannot be ignored, or the effect of the point of action changes with time.

3.49

Verification verification

Verification to verify that an activity, a product, or a service meets the specified requirements.

3.50

Watertight watertight

The ability to prevent water from penetrating into or entering the structure under the design of water pressure conditions in the surrounding structure.

3.51

Weathertight

When the structure is temporarily exposed to water, it prevents the ability of water to penetrate the structure.

Note. Watertight closures are also considered to be weathertight.

4 symbols and abbreviations