ISO 19901-5:2021 石油および天然ガス産業—オフショア構造の特定要件—パート5：重量管理 | ページ 6

3.1

approved variation

approved scope change affecting the predicted weights (3.32) and changing the control weights (3.11)

3.2

assembly

designed and fabricated group of discipline bulks (3.12) and tagged equipment (3.34) that form one unit

3.3

brownfield

modifications made to an existing facility (3.16)

3.4

budget weight

weight and centre of gravity (3.5) reference values as part of the control weights (3.11)

3.5

centre of gravity

CoG

point in a body or system of bodies at which the entire weight is considered to act

Note 1 to entry: For assemblies, the aggregate CoG is the mathematical weighted mean of the CoGs of the individual items (comprising the completed assembly) measured from a common reference point.

3.6

centre of gravity envelope

CoG envelope

defined volume within which the centre of gravity (3.5) of an assembly (3.2) is constrained for a specified loading condition (3.23)

3.7

conceptual design

phase of design during which several concepts are evaluated, and preferred concepts are selected

3.8

conceptual design weight

sum of the predicted weight (3.32) and the conceptual design weight reserve (3.9)

Note 1 to entry: This weight is used for engineering purposes and for checking fabrication/installation strategies during conceptual design.

3.9

conceptual design weight reserve

provision during conceptual design to allow for reserves when control weights are determined

3.10

consumable

material used and replenished during normal operation of a facility (3.16)

3.11

control weights

budget weight (3.4) [and associated centre of gravity envelope (3.6) ], not-to-exceed weight (3.28) [and associated centre of gravity envelope (3.6) ] and reserves [e.g. management reserve (3.24) , planned future reserve (3.31) , un planned future reserve (3.38) ] for each loading condition (3.23)

3.12

discipline bulks

all dry weight items (3.43) excluding tagged equipment (3.34)

3.13

dry weight

weight of a component, weight item (3.43) or an assembly (3.2) in its dry installed condition including permanent contents in closed systems in tagged equipment (3.34)

Note 1 to entry: Examples of permanent contents are gearbox oil, hydraulic oil, filter sand, coolant, etc.

Note 2 to entry: Excludes variable weights.

Note 3 to entry: Dry weight results in permanent actions, defined as G1 and G2 in ISO 19902 and ISO 19901-3.

3.14

estimate to complete

ETC

estimated weight (3.15) of discipline bulks (3.12) and/or tagged equipment (3.34) with insufficient definition measured by weight take-off

3.15

estimated weight

weight derived by using norm-based calculations or previous experience

3.16

facility

topsides (3.36) and substructure that is built and installed to serve a particular purpose

3.17

front end engineering design

FEED

phase following conceptual design (3.7) phase, during which the selected concept is matured, and design parameters normally are fixed

3.18

greenfield

new facilities that are fabricated onshore and installed offshore

3.19

gross weight take-off

gross WTO

net weight take-off (3.27) plus net weight allowance (3.26)

3.20

hook-up and commissioning

HUC

installation of components or assemblies (3.2) after the topsides (3.36) have been installed to complete a functioning facility (3.16)

3.21

lift weight

weight of a component or assembly (3.2) at its lift points, including permanent items and temporary items (3.35) , but excluding the lift rigging

3.22

lightship weight

displacement of the complete floating facility (3.16) (i.e. ready for service) with all its machinery, equipment and outfitting, including permanent ballast, required spare parts, constant process fluids and liquids in tagged equipment (3.34) and piping at their working levels but without liquids in storage or reserve supply tanks, items of consumable or variable loads, stores or crews and their effects

3.23

loading condition

condition for which the weight and centre of gravity (3.5) of an assembly (3.2) is required to be managed

Note 1 to entry: See 5.5.

3.24

management reserve

reserve to take account for scope changes after setting the control weights (3.11)

3.25

master equipment list

MEL

project specific list for compiling and managing technical data for tagged equipment (3.34)

3.26

net weight allowance

addition applied to net weight take-off (3.27) to account for weight growth due to item weight uncertainty, design development and construction

Note 1 to entry: Guidance on net weight allowances is given in Annex J.

3.27

net weight take-off

net WTO

weight take-off based on the actual designed data from 3D model, engineering drawings or supplier data

3.28

not-to-exceed weight

NTE weight

maximum acceptable weight and centre of gravity envelope (3.6) for the respective loading condition (3.23)

3.29

operating reserve

weight difference between the predicted weight (3.32) and the not-to-exceed weight (3.28) during the operations phase

3.30

operating weight

dry installed weight plus variable weight (3.40)

3.31

planned future reserve

reserve to account for planned modifications (e.g. additions, removals or relocations) during the operations phase of the facility (3.16)

3.32

predicted weight

expected (median) weight, the sum of gross weight take-off (3.19) and estimate to complete (3.14) through all project phases

Note 1 to entry: The median (P50) weight estimate has a 50-50 chance of being lesser or greater than the out-turn weight.

Note 2 to entry: During the conceptual design phase, the net and gross WTO’s can be zero.

3.33

reconciled weighed weight

actual weight at the time of the weighing, including any weighing correction(s)

3.34

tagged equipment

equipment identified and tracked in the master equipment list (3.25)

3.35

temporary items

items temporarily installed during a loading condition (3.23) and removed afterwards

Note 1 to entry: Temporary items do not form part of a structure’s permanent dry or operating weight.

3.36

topsides

assemblies placed on a substructure (fixed or floating) to provide some or all of a facility's (3.16) functions

Note 1 to entry: For floating facilities and jack-ups, the hull deck is not typically part of the topsides, however, some of the equipment and discipline bulks mounted in or on the hull can be defined as part of the topsides.

Note 2 to entry: A separate fabricated deck or module support frame is part of the topsides.

3.37

uncertainty allowance

allowance, based on risk analysis or experience, to account for the immaturity of the conceptual design scope

3.38

unplanned future reserve

reserve to account for the addition of unplanned modifications during the operations phase of the facility (3.16)

3.39

upper bound weight constraint

maximum weight during conceptual design (3.7) phase

3.40

variable weight

weights of fluid and powders in tagged equipment (3.34) and piping, including process and non-process fluids (e.g. brine, potable water and diesel storage), drill pipe, drill casing, drilling consumables (3.10) (e.g. fluids and powders), scaffolding, laydown areas and storage areas, that occur coincidently

Note 1 to entry: A more comprehensive list of variable weight is given in Table D.1.

Note 2 to entry: Variable weight results in variable actions, defined as Q1 in ISO 19902 and ISO 19901-3.

3.41

weight database

database containing the net weight take-off (3.27) , gross weight take-off (3.19) and/or estimate to complete (3.14) for each weight item (3.43) that sums to the predicted weight (3.32) and centre of gravity (3.5) for each loading condition (3.23)

Note 1 to entry: See Annex G.

3.42

weight database custodian

WDC

organization tasked with the responsibility for maintaining the weight database (3.41) during operations phase

Note 1 to entry: The weight database custodian should be appointed at the start of operations.

3.43

weight item

individual or group of discipline bulks (3.12) and/or tagged equipment (3.34) , variable weights (3.40) or assembly (3.2) identified for weight reporting purposes

3.44

weight management objective

set of engineering goals necessary to fulfil weight and centre of gravity (3.5) requirements

3.45

weight sensitive

predicted weight is 95 % or more of the capacity of the transport and installation (T&I) marine equipment or the predicted weight is 95 % or more of the not-to-exceed weight (3.28)