TABULATION OF ABBREVIATIONS, DEFINITIONS AND SYMBOLS USED IN ISO

82 Pages·2007·0.39 MB·English

ISO/TC67/SC4/WG6 N 172 Rev 2

TABULATION OF ABBREVIATIONS, DEFINITIONS AND
SYMBOLS USED IN ISO AND API SUBSEA STANDARDS

Extracted from published ISO 13628 and API 17 series of standards

Up to date as of: 2006-08-29

HOLD – TO BE COMPLETED:
Preferred abbreviations and definitions are highlighted as per agreement by API
Subcommittee 17 and ISO/TC67/SC4 Workgroup 6 in their joint meeting of 2007-
XX-YY.

Note: Where an ISO 13628 standard have been adopted by API, the definitions and
abbreviations in the ISO standard only have been included herein. This applies to:

• API RP 17A which is an identical adoption of ISO 13628-1:2005
• API RP 17J which is assumed to be an identical adoption of ISO 13628-2:2006
• API RP 17C which is an identical adoption of ISO 13628-3:2000
• API Spec 17E which is an identical adoption of ISO 13628-5:2002
• API Spec 17F which is assumed to be an identical adoption of ISO 13628-6:2006
• API Spec 17H which is an identical adoption of ISO 13628-8:2002
• API Spec 17M which is an identical adoption of ISO 13628-9:2000
• API Spec 17K which is an identical adoption of ISO 13628-10:2005

Originally compiled & updated by: Liv Skjellum Ingebretsen, Norsk Hydro, Norway

With comments from PoscCaesar (ISO 15926).

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ISO/TC67/SC4/WG6 N 172 Rev 2
DEFINITIONS

ISO 15926 comments
Defined word Definition Used in

Accidental load Load(s) which are imposed on the ISO 13628-7 The definition is too context
C/WO riser system under dependent compared with the
abnormal and unplanned term.
conditions.
EXAMPLES: Loss of vessel
station-keeping and heave
compensator lock-up.

Agreement Unless otherwise indicated, “by ISO 13628-7 The definition is too context
agreement” means “by agreement dependent compared with the
between manufacturer and term.
purchaser at the time of enquiry
and order”

Ancillary Component used to control the ISO 13628-2 General term
component flexible pipe behavior such as
bend stiffeners and buoyancy
modules.

Ancillary Components used to control the ISO 13628-10 General term
components flexible pipe behavior, such as
buoyancy aids and fire hoods/
boxes

Ancillary Accessory to an umbilical system, ISO 13628-5 General term
equipment which does not form part of the
main functional purpose.
Examples for an umbilical system
would be: weak link, buoyancy
collar and I-tube or J-tube seals.

Annulus Space between the internal ISO 13628-2 A volume defined as the space
(ANNULUS) pressure sheath and outer sheath. between the OD of an inner
sealing element and the ID of
NOTE: Permeated gas and liquid an outer sealing element of a
is generally free to move and mix concentric piping
in the annulus. configuration.

Annulus seal A mechanism which provides API SPEC
assembly pressure isolation between each 17D
casing hanger and the wellhead
housing.

Annulus seal Device which provides pressure ISO 13628-4 The definition is too context
assembly isolation between a casing hanger dependent compared with the
and the wellhead housing. term.

Anti-wear layer Non-metallic layer, either extruded ISO 13628-2
thermoplastic sheath or tape
wrapping, used to minimize wear
between structural layers

API Monogram Registered mark of the American ISO 13628-10
Petroleum Institute

Apparent weight Submerged weight including ISO 13628-7
Weight in water content minus buoyancy
Wet weight
Net lift
Submerged
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ISO/TC67/SC4/WG6 N 172 Rev 2
ISO 15926 comments
Defined word Definition Used in

weight
Effective weight
Arrhenius plot Used to plot service life against API RP 17B
the inverse of temperature for
some polymer materials by means
of a log-linear scale.

Attachment weld Fillet or full penetration weld used ISO 13628-7
for attachment of components to
pipe or coupling

Auxiliary line Conduit (excluding choke and kill ISO 13628-7
lines) attached to the outside of
the riser main pipe.
EXAMPLES: Hydraulic supply line
and annulus circulation line.

Ball joint Ball and socket assembly having ISO 13628-7 The definition is too context
a central through-passage equal dependent compared with the
to or greater than the riser internal term.
diameter.

NOTE: This can be positioned in
the riser string to reduce local
bending stresses.

Barrier Element forming part of a ISO 13628-1 ISO 15926: (agreed definition):
pressure-containing envelope “A divider that blocks or is
which is designed to prevent intended to block against
unintentional flow of passage”. To better represent
produced/injected fluids, this definition the name should
particularly to the external be changed, e.g. to “FLUID
environment. PRESSURE BARRIER”

Barrier One or several barrier elements ISO 13628-7 FORMATION PRESSURE
that are designed to prevent BARRIER?
unintended flow of formation fluid

Barrier element Device that, alone, cannot prevent ISO 13628-7 This cannot be correct? A
flow from one side to the other barrier element is a barrier –
side of itself see above.

Basket Used for storage and transport of API RP 17B The definition is too context
(PIPE BASKET) flexible pipe (all pipes are laid dependent compared with the
freely into the basket). term.

Bearing stress Average normal stress on the ISO 13628-7
contact surfaces of mating
surfaces

Bellmouth Part of a guide tube, formed in the ISO 13628-10 A bend limiter that is a part of
shape of a bellmouth, and …
designed to prevent overbending
of the flexible pipe

Bellmouth Part of a guide tube, formed in the ISO 13628-2
shape of a bellmouth and
designed to prevent over-bending
of flexible pipe.

Bend limiter Any device used to restrict ISO 13628-10 This a correct definition.
bending of the flexible pipe.
NOTE: Bend limiters include bend
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ISO/TC67/SC4/WG6 N 172 Rev 2
ISO 15926 comments
Defined word Definition Used in

restrictors, bend stiffeners and
bellmouths.

Bend limiter Any device used to restrict ISO 13628-2
bending of a flexible pipe.

NOTE: Bend limiters include bend
restrictors, bend stiffeners and
bellmouths.

Bend limiter Device for limiting the bend radius ISO 13628-5
of the umbilical by mechanical
means.

NOTE: It typically comprises a
series of interlocking metallic or
moulded rings, applied over the
umbilical.

Bend radius Radius of curvature of the flexible ISO 13628-10
pipe measured from the pipe
centreline.

NOTE: Storage and operating
minimum bend radii are defined in
5.3.1.6 and 5.3.1.7.

Bend radius Radius of curvature of the flexible ISO 13628-2
pipe measured to the pipe
centreline.

NOTE: Storage and operating
minimum bend radius (MBR) are
defined in 6.3.1.

Bend radius Radius of curvature as measured ISO 13628-3 ISO 15926: “A radius which is
(BEND POINT to the centreline of a conduit, pipe the radius of a piping bend
RADIUS) or umbilical. measured from the centre
line”.
Bend restrictor Mechanical device that functions ISO 13628-10 A bend limiter that is a part of
as a mechanical stop and limits …
the local radius of curvature of the
flexible pipe to a minimum value.

Bend restrictor Mechanical device that functions ISO 13628-2
as a mechanical stop and limits
the local radius of curvature of a
flexible pipe or umbilical to a
minimum value.

Bend stiffener Ancillary conically shaped ISO 13628-10 A bend limiter that is a part of
component, which locally supports …
the pipe to limit bending stresses
and curvature of the pipe to
acceptable levels.
NOTE: Bend stiffeners can be
either attached to an end fitting or
a support structure where the
flexible pipe passes through the
bend stiffener.

Bend stiffener Ancillary conically shaped ISO 13628-2
component which locally supports
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ISO/TC67/SC4/WG6 N 172 Rev 2
ISO 15926 comments
Defined word Definition Used in

the pipe to limit bending stresses
and curvature of the pipe to
acceptable levels.

NOTE: Bend stiffeners can be
attached to either an end fitting or
a support structure if the flexible
pipe passes through the bend
stiffener.

Bend stiffener Device for limiting the bend radius ISO 13628-5
of a flexible pipe or umbilical by
providing a localized increase in
bending stiffness.

Bending stiffness Analogous to the structural ISO 13628-10
stiffness of a rigid beam or pipe
(modulus of elasticity times the
second area moment of inertia),
except that it can vary to a large
extent with temperature and
pressure.

NOTE: It is often quantified as the
product of an applied bending
moment times the resultant bend
radius of the pipe.

Bending stiffness Ability of a flexible pipe to resist ISO 13628-2
deflection when subjected to
bending loads at constant tension,
pressure and temperature

Bird-caging Buckling of the tensile armor API RP 17B
wires, which results in significant
radial deformation. It is usually
caused by extreme axial
compression.

Bird-caging Phenomenon whereby armour ISO 13628-5
wires locally rearrange with an
increase and/or decrease in pitch
circle diameter as a result of
accumulated axial and radial
stresses in the armour layer(s).

Blow-out Device installed at the wellhead to ISO 13628-7
preventer contain well-bore pressure either
BOP in the annular space between the
casing and the tubulars or in an
open hole during drilling,
completion, testing or workover

Bonded pipe Flexible pipe where the steel ISO 13628-10
reinforcement is integrated and
bonded to a vulcanized
elastomeric material.

NOTE: Textile material is included
in the structure to obtain additional
structural reinforcement or to
separate elastomeric layers.
Bonded pipe Flexible pipe in which the steel ISO 13628-2
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ISO/TC67/SC4/WG6 N 172 Rev 2
ISO 15926 comments
Defined word Definition Used in

reinforcement is integrated and
bonded to a vulcanized
elastomeric material where
textile material is included in
the structure to obtain
additional structural
reinforcement or to separate
elastomeric layers.

Boost Pressure maintained on the ISO 13628-6
spring-return side of a subsea
actuator for the purposes of
improving closing-time response.

BOP adapter joint Tubing hanger orientation joint ISO 13628-7
BOP spanner specialized C/WO riser joint used
joint when the C/WO riser is deployed
inside a drilling riser and subsea
BOP to install and retrieve an
orientated subsea tubing hanger

BOP stack Assembly of well control ISO 13628-7
equipment including BOPs,
spools, valves, hydraulic
connectors, and nipples that
connect to the subsea wellhead
NOTE As commonly used, this
term sometimes includes the
LMRP.

Bore protector A device which protects internal API SPEC
bore surfaces during drilling or 17D
work-over operations.

Bore protector Device which protects internal ISO 13628-4 ISO 15926: “A wear bushing
bore surfaces during drilling or that is run into and set in the
work-over operations. wellhead or christmas tree to
protect the inside wall against
wear from the drill bit and drill
pipe during drilling operations”.
Breaker Textile layer impregnated with ISO 13628-10 The name does not reflect the
(TEXTILE rubber included in various layers context of the definition.
BREAKER in the pipe cross-section to give
LAYER) additional strength to the pipe, to
aid in reducing propagation of cuts
in the pipe and to aid the
manufacturing process.
NOTE: This layer can be
incorporated into either or all of
the cover, reinforcing layer and
liner.

Bundle Laid-up functional components ISO 13628-5 ISO 15926: “A grouping of
and associated fillers in the parallel lines, wires or tubes
umbilical prior to sheathing. reaching from the point of
operation to the point of
NOTE: Typical functional control.”
components in a bundle include
hoses, tubes, electric cables,
optical fibre cables.

Buoyancy module A buoy used in significant API RP 17B
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ISO/TC67/SC4/WG6 N 172 Rev 2
ISO 15926 comments
Defined word Definition Used in

numbers at discrete points over a
section of riser to achieve wave
shape riser configurations (see
4.4.6). See also definition for
subsea buoy.

Buoyancy module Structure of low-mass material, ISO 13628-7
usually foamed polymers strapped
or clamped to the exterior of riser
joints, to reduce the submerged
mass of the riser

Burst pressure Pressure across a component, or ISO 13628-6
within a system, at which failure
by burst is calculated to occur.

Burst-disk Weak points in the outer ISO 13628-2
sheath designed to burst when
the gas pressure in the
annulus exceeds a specified
value.

NOTE: The weak point is induced
by reducing the thickness of the
sheath over a localized area.

Cable Series of round wires of steel or ISO 13628-10 The generic name does not
fabric (circular cross-section) represent the context
spirally wound (stranded) together dependent definition. This
and used for structurally definition is not a cable as is
reinforcing the pipe. defined in the common
NOTE: Cable wires for flexible definition of the word. Oxford
pipes are usually brass or copper Dictionary definition: "a thick
coated to promote chemical rope of wire or hemp"
bonding of the elastomer to the
wires.

Calculation Use of analytical-based formulas ISO 13628-7 ISO 15926: "determining by
or numerical-based methods, e.g. mathematical process"
finite element method or boundary
element method, to investigate the
structural safety of a
component/system

Calendering Process of passing elastomer ISO 13628-10
compound between rollers to
produce smooth sheets of
elastomer.

NOTE: This process is also used
to cover reinforcing cables and
textiles with elastomer to form
sheets for winding onto pipes.

Candidate A polymeric material which is API 17TR1
Polymer proposed for use as the internal
pressure sheath of an unbonded
flexible pipe and is being
submitted for evaluation testing.

Carcass Interlocked metallic construction ISO 13628-10
that can be used as the innermost
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ISO/TC67/SC4/WG6 N 172 Rev 2
ISO 15926 comments
Defined word Definition Used in

layer to prevent, totally or partially,
collapse of the pipe due to pipe
decompression, external
pressure, reinforcement layer
pressure and mechanical crushing
loads.

NOTE: It can be used externally to
protect the external surface of the
pipe.

Carcass Interlocked metallic construction ISO 13628-2
that can be used as the innermost
layer to prevent total or partial
collapse of the internal pressure
sheath or pipe due to pipe
decompression, external
pressure, tensile armour pressure
and/or mechanical crushing loads.

NOTE The carcass may be used
externally to protect the external
surface of the pipe.

Carousel Used for storage and transport of API RP 17B
flexible pipe in very long lengths
and rotates about a vertical axis.
Pipe is wound under tension
around the center hub.

Carousel Storage container which can be ISO 13628-5 Name must be changed to
(STORAGE rotated by a drive about a vertical reflect definition and to avoid
CAROUSEL) axis. confusion with other technical
areas.
Caterpillar Cable engine in which an ISO 13628-5
umbilical is held between belts
which transfer motive power to the
umbilical/pipe.

Characterization Data relating to a component ISO 13628-5
data giving an indication of
performance but not giving
specific
acceptance/rejection criteria.

Charpy V-notch Test to indicate fracture ISO 13628-7
test toughness in terms of energy
absorbed or lateral expansion or
fracture appearance

Check valve A device designed to restrict flow API SPEC
in one direction. 17D

Check valve Device designed to restrict flow in ISO 13628-4 ISO 15926: “A valve that
one direction. permits fluid to flow in one
direction only.”
Chinese finger Type of gripper or stopper used to ISO 13628-5
hold a pipe or umbilical via its
outer diameter, typically
comprising a number of spirally
interwoven wires attached to a
built-in anchor arrangement.

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ISO/TC67/SC4/WG6 N 172 Rev 2
ISO 15926 comments
Defined word Definition Used in

Chinese fingers A woven steel wire or fabric API RP 17B
sleeve that can be installed over a
flexible pipe and drawn tight to
grip it for support or applying
tension to the pipe.

Chinese lantern Riser configuration used in API RP 17B
shallow water offshore loading
systems to connect a PLEM to a
buoy directly above it. The upper
and lower connections are vertical
and excess riser length is
supported by distributed
buoyancy. See Fig. 4 in API RP
17B.

Choke and kill Flexible pipe jumper located ISO 13628-10
line between choke manifold and
blow-out preventer.

Choke-and-kill Flexible pipe jumper located ISO 13628-2
line between choke manifold and
blow-out preventer.

Choke-and-kill External conduits, arranged ISO 13628-7
line laterally along the riser pipe, and
used to circulate fluids into and
out of the wellbore to control well
pressure

Circulation control Valve normally placed across a ISO 13628-3 A control valve …
valve circulation point to allow isolation.

Circulation point Location where communication is ISO 13628-3
established for fluid circulation.

Commanded Closure of the underwater ISO 13628-6 Name does not represent
closure safety valve and possibly other definition. Propose new name
valves depending on the “COMMANDED VALVE
CLOSURE” defined as:
control system design.
Closure of a valve due to a

command issued via a control
NOTE: Such commands can
system”
originate manually, automatically
or as part of an ESD.

Completion riser A riser that is designed to fit inside API SPEC
a BOP to allow installation of a 17D
tubing hanger, and may also be
suitable for connection to the tree
upper connection for use as a
means for running the tree or for
use as a workover riser (see
workover riser).

Completion riser Riser that is designed to fit inside ISO 13628-4
a BOP to allow installation of a
tubing hanger, and may also be
suitable for connection to the tree
upper connection for use as a
means for running the tree or for
use as a workover riser.

Completion riser Temporary riser that is designed ISO 13628-7
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ISO 15926 comments
Defined word Definition Used in

to run inside a BOP and drilling
riser to allow for well completion
NOTE Completion operations are
performed within the drilling riser.
A completion riser can also be
used for open-sea workover
operations.

Completion work- A temporary riser used during API RP 17G
over riser completion or workover operations
either inside a marine riser or in
open sea.

Completion/worko Temporary riser used for ISO 13628-7
ver riser completion or workover operations
C/WO riser
Component Part of the pressure-containing ISO 13628-7 A component is a generic
equipment, which can be name for all kinds of parts. ISO
considered as an individual item 15926 definition is “A
for the calculation. compound is a generic name
for all mixtures”. This is based
NOTE: Includes structural on Oxford English Dictionary.
components like pipes, Logically applicable only in
connectors, stress joints, tension plural to the whole of the
joints, landing blocks, slick joints, elements or parts of a
tubing hanger orientation joints, compound body; but in
adapter joints, etc. practice each element is called
a component.

Compound Mix of elastomer material and ISO 13628-10 A compound is a generic
(ELASTOMERIC various additives immediately name for all mixtures.
COMPOUND) prior to the curing process

Concentric bore A tubing hanger where the API SPEC
tubing hanger production bore is concentric with 17D
the O.D. of the hanger.

Conductor The top of the first casing string API SPEC
housing which forms the basic foundation 17D
of the subsea wellhead and
provides attachments for guidance
structures.

Conductor The top of the first casing string ISO 13628-4
housing which forms the basic foundation
of the subsea wellhead and
provides an attachment for
guidance structures.

Connector Device used to provide a leak- ISO 13628-10 Change name to “Mechanical
tight structural connection connector” to distinguish
between the end fitting and between electrical and
adjacent piping. mechanical connectors.
Ref. API 6H, Ch. 0
NOTE: Connectors include bolted
flanges, clamped hubs and
proprietary connectors. They can
be designed for diver-assisted
makeup or for diverless operation
using either mechanical or
hydraulic apparatus.

Connector Device used to provide a leak- ISO 13628-2
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