moffat hot stab data sheet
TRANSCRIPT
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Moffat2000Limited
RemscheidWay
JubileeIndustrialEstate
Ashington
Northumberland
NE638UJ
Tel: +44(0)1670840850
Fax:
+44(0)1670
810154
Email: [email protected]
Web: http://www.moffat2000.com
Copyright2010 Allrightsreserved
Page1of9 ABCDEFLRQA:0959195 FPAL:10044531
Moffat
Subsea
Stab
Connector
TheMoffatSubseaStabConnectorisacompact,lightandcosteffectiveconnectorthatallowsahosetobe
connected /disconnected subsea. Theproducthasbeen inservice since1995andhasbeen refinedand
developed up until the present day as the demands of the subsea market have increased. It is now
recognisedbymanyoperatorsas the 'bestofbreed' industry standard item for subseapigging, chemical
injection,gasinjection,floodingandventingoperations.
DesignCode: API6A(ISO10423),API17D/H,ASMEB31.8,ASMEVIIDIV.2,PD5500andPED
(Othersavailable
upon
request)
Sizes: ",1",2",2",3",4",6"and8"NominalBore
PressureRange: 6,000PSI(414BAR),10,000PSI(690BAR)and15,000PSI(1035BAR)
MaxWaterDepth: 3,000m
MaterialSelection: 316St.Stl,DuplexUNS31803,SuperDuplexUNS32760, Inconel625,Nitronic60
andHiduron(Othersavailableuponrequest)
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KeyFeatures
EaseOfUse Themaleandfemalecomponentsofthestabconnectorareeasytoassembleinservice. All
thatisrequiredisfortheROVtoalignthemalewiththereceptacleandpush. Carefullyshapedlowfriction
guides on the two components correct any inaccuracies in the alignment of the initial makeup as the
connectionismade.
Pressure Balanced Design The seal arrangement of the connector is such that all pressure forces are
retainedinthebodyofthemale/femalecomponents. Nonetforceactsalongtheaxisofthestaboronthe
retaining mechanism. This means that in the case of an emergency the male stab connector can be
disconnectedunderpressure.
RotatingHandleandCollarThemalestabhandleisfittedwitharotatingcollar. Thecollarallowsthestab
bodytorotatethroughafull360independentofthehandle. ThisallowstheROVtomanipulatethemale
stabwhilstanytorsioninthehoseplaysoutduringdeployment.
'J'SlotLockingMechanismAfterinsertioninthefemalereceptaclethemalestabhandlecanberotated30
insidea'J'
Slot
machined
into
the
cap
of
the
female
receptacle.
This
serves
two
purposes:
1)
it
shows
visually that thestab is locatedcorrectly inside the female receptacleand2)providesaphysical restraint
againstanyaxialforceonthehose. Astheassemblyispressurebalancedtherearenoforcesonthe'J'slot
lockingmechanismduetopressure.
EaseOfMaintenanceTheassemblyisincrediblyrobustandduetothesimpleminimalmovingpartdesign
it requires very littlemaintenance. Themale stab sealsdooccasionallyneed replacing. This isa simple
operationandMoffatcanprovidesparesealsandchangetoolstocarryouttheprocedure.
ManyConfigurationOptionsTheMoffatSubseaStabConnectorhasbeendeployed worldwideformany
differentuses. Assuchmanystandardconfigurationsarealreadypossible;someofwhichareshownwithin
thisdatasheet.
If
you
require
aparticular
adaption
please
contact
our
sales
team
who
will
be
pleased
to
help.
Double Sided Solution It is sometimesnotpossible topredict theorientationof the female receptacle
when it is subsea (e.g.duringpipelayoperations). If this isa concernand there isapossibility that the
female receptaclemaybe inaccessible then it isnecessary touseadoublesided female receptacle. This
receptacleissymmetricalandallowsthemalestabtoenterfromeitherside.
SurplussingValve Solution Male stabs can be fitted with a Moffat Surplussing Valve. This option is
typicallyused topreventhose collapsedue toexternal seawaterpressure fordeepwateroperations. A
surplussingvalveisacheckvalvethatsealsinonedirectionandallowsflowafterapredeterminedcracking
pressurein
the
other.
This
allows
ahose
to
be
deployed
with
an
internal
pressure
applied
to
balance
the
externalhydrostaticpressure. Duringoperationthepressureisraisedbeyondthecrackingpressureandthe
valvewillopenandallowflow. Ifthepressuredropsbelowthecrackingpressurethevalveclosestoprotect
thehose.
ForgedFemaleReceptacle Whereweldedoutletconnectionsarenotallowedbyprojectspecificationitis
possibletoprovidethefemalereceptacle&outletconnectionmachinedfromasingleforgingofthechosen
material. Pleasecontactoursalesdepartmentformoredetails.
Hydrogen Induced StressCracking (HISC) When supplied in Super Duplex (UNS32760)orDuplex (UNS
31803)partscanbesupplied inaccordancewithDNVRPF112 RecommendedPractice Designofduplex
stainlesssteel
subsea
equipment
exposed
to
cathodic
protection.
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MaleStab
ApproximateDimensions:
NominalBore A(mm) B(mm) C(mm) W(kg)
3/4" 290 595 120 6.0
1" 360 595 120 7.5
2" 590 775 175 18.0
21/2" 600 790 175 20.0
3" 670 830 200 28.0
4" 800 960 215 53.0
6" 915 1100 350 155.0
8" 955 1150 400 195.0
Notethat
the
dimensions
above
are
based
on
astandard
male
stab
with
a'fish
tail'
handle
and
female
hammerlugunioninlet. Drawingsand3DModelstomatchyourpreciserequirementsareavailableviaour
salesdepartment.
InletConnection
Standardhoseendconnectionsinclude:FemaleHammerLugUnion(Fig.1502,602,206,etc.),Flanged(API
6AorANSI),HuborFemaleThreaded(NPT,BSPorAutoclave).
Handle
Manycombinationsofhandlearepossible,commononesareshownbelow. Otherssuchas:Paddle,Goal
Post,Circular
or
Inline
Pull
are
available
upon
request.
FishTail
'T'
Bar
'D'
Type
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FemaleReceptacle
ApproximateDimensions:
NominalBore A(mm) B(mm) W(kg)
3/4" 90 230 8.0
1" 90 230 8.0
2" 135 360 29.0
21/2" 150 375 35.0
3" 170 425 39.0
4" 185 455 51.0
6" 360 835 340.0
8" 370 840 560.0
OutletConnection
Thestandard
outlet
is
butt
weld
end
to
suit
the
nominal
bore
of
the
female
receptacle.
Pipe
schedule
can
be
sizedtomatchcustomerrequirements. Inordertoprovidematerialcompatibilityandeaseof installation
thereceptaclecanbefabricatedcompletewithwelded 'pup'piecestomatchmatingpipework. Unitscan
alsobesuppliedwithflangedoutletconnection(i.e.ANSIorAPI).
Receptacle
Mounting
Femalereceptaclesshouldbesupportedtopreventflexingofmatingpipeworkduringstabbingoperations.
Forthispurposefemalereceptaclescanbeprovidedwithmountingflanges. Ifthisisnotnecessary(i.e.the
femalereceptacleissupportedinsomeothermanner),themountingflangecanbeomitted.
Earthing
Device
In longterm installationswhereablindstab istobepermanently inserted intothefemalereceptacle it is
oftennecessarytoensureelectricalcontinuitytotheblindsothatitisprotectedbythecathodicprotection
system. Inthiscase, it ispossibletosupplythe femalereceptaclecompletewithaspringloadedearthing
contactpointtoensurecontinuity.
TestReceptacle
Toallowthecompletehoseassemblytobetestedtopsidepriortodeploymentitisoftennecessarytousea
dedicated female test receptacle. Thesecanbe supplied completewithconvenientpressure tapings (i.e.
NPT,BSPorAutoclave)tomatchupwithtestequipmentandsupportfeetforinstallationondeck.
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BlindStab(pressureretaining)
ApproximateDimensions:
NominalBore
A
(mm)
B
(mm)
C(mm)
W
(kg)
3/4" 290 595 120 6.0
1" 290 595 120 6.0
2" 490 775 175 14.0
21/2" 500 790 175 16.0
3" 550 830 200 21.0
4" 700 960 215 38.0
6" 765 1100 350 140.0
8" 805 1150 400 175.0
Blind stabs are rated to the same working pressure as the equivalent male stab and are often used for
hydrotest.They
can
be
left
in
place
for
long
term
emersion
in
order
to
protect
the
female
receptacle
and
/
ortoactasanadditional'block'inthesubseasystem.
Sacrificial
Pressure
Relief
Device
Where it is thought possible that internal
pressuremaybuildupbehindtheblindstabit
is possible to fit a sacrificial pressure relief
device to allow pressure to be dissipated
without having to remove the whole stab.
This device is cut by the ROV and it allows
pressure
from
the
pipework
to
be
more
safely
vented. This can be provided as a hose
connection (as shown) or for deepwater
operation as a thin blind pipe. A range of
material options are possible depending on
desiredlengthofservice.
RetainingStrap
Toprevent theROVaccidentallydropping theblind stab they canbe supplied completewith a retaining
strapthatfixestheblindtothefemalereceptacle. Thisstrapcanalsobeprovidedinconductivematerialsto
doubleasanearthingpathforcathodicprotection.
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DummyPlug(non-pressureretaining)
A dummy plug is a simple plastic stab that fits inside the female receptacle. It can be used during
deploymentorduring longtermemersion toprovideaneffectivemeansofpreventingdebrisandmarine
growthenteringthefemalereceptacle. Dummyplugsareavailableforallsizesoffemalereceptacleandina
range of materials depending on the service required. As for blind stabs they can be provided with a
retainingstrap
to
prevent
against
accidental
drop
and
to
provide
electrical
continuity
to
the
metal
handle
if
required.
SealKit&ChangeTool
The stab assembly requires very little maintenance
howeverthemale&blindstabsealsdooccasionally
need replacing. It is very important that this
operation is carried out using the dedicated seal
change tool for the stab and using procedures
providedbyMoffat. Thisensures that the sealsare
installedcorrectly
in
their
grooves
and
are
sized
correctly. Training for stab operators can be
providedatourworks.
ProtectionSleeve
Protectionsleevescanbeprovidedtoprotectmale/blindstabsealswhilstawaitingdeploymentorduring
transit. Thisisarigidplasticcoverthatprotectsthesealsandhelpskeepthemcorrectlysized. Thesleeve
shouldberemovedpriortodeployment.
Parking
Receptacles
In order to assist with manipulation of stabs during operation it is
oftennecessarytoprovideaplacetotemporarilystoreonestab(e.g.
ablindstab)whilstanotherisinserted intothefemalereceptacle. A
Parking receptacle can be provided for this purpose. Parking
receptaclesareplasticcomponentsthatmatchtheboreofthefemale
receptacleandareprovidedwithaconvenientmountingflange.
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FlowData
Theflowratetodifferentialpressure(DP)curvesforthevarioussizehotstabassembliesareshown inthe
chartsbelow. Thesecurveshavebeenderivedbyphysicalflowtestingoftheequipmentandverifiedusing
computational fluidmechanics (CFD). The charts show theexpected flowagainstpressuredrop for sea
water.Curves
for
other
flow
media
(e.g.
MEG
mix,
Nitrogen,
etc.)
are
available
upon
request.
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
0 5 10 15 20
FlowR
ate(Li
tresperminute)
Pressure Diff erential (Bar)
Moffat 2000 Stab Conn ector Assembly Flow Rate / DP Curves (SeaWater)
3"
2"
1"
Fig.1 Flowrate/DPcurvefor1",2"and3"Assembly
0
2500
5000
7500
10000
12500
15000
17500
20000
22500
25000
27500
30000
0 5 10 15 20
FlowR
ate(Litrespreminute)
Pressure Differential (Bar)
Moffat 2000 Stab Connecto r Assembly Flow Rate / DP Curves(Sea Water)
4"
6"
8"
Fig.2
Flowrate
/DP
curve
for
4",
6"
and
8"
Assembly
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API6A(ISO10423)PR2Verification
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Moffat2000Ltd,based intheNorthEastofEngland,offersdesignandfabricationservicesforasignificant
rangeofpipelineproductsaimedatthepetrochem,process,offshoreandsubseamarketsbothintheUnited
KingdomandOverseas.
The company has engineering experience and expertise to provide a wide range of bespoke engineered
productsincluding:piglaunchers&receivers,manifoldskids,suctionpilehatches(hingedorbutterfly),filter
separatorpackagesandpullinheads.
Ancillarysubseaequipmentassociatedwiththeaboveisalsosuppliedbythecompanyandincludes:Moffat
Subsea
Stab
Connectors,MoffatSurplussingValves,subseaball/checkvalves,pigretainer(lock)devices
and
ROV
valve
interfaces.
Aprime componentof the successof the company is the commitment toquality andhealthand safety.
MoffatholdsLRQAaccreditationtoISO9001:2008andaHealthandSafetypolicyinlinewithISO18001.
ThecustomerbasecoversbothendusersandEPCcontractorsincluding:
ACERGY
AKER
BELVALVES
BIBBYOFFSHORE
BHP
BJSERVICES
BP
CAMERONSUBSEASYSTEMS
CHEVRON
DAEWOO
EXXONMOBIL
FMC
VETCOGRAY(GEOILANDGAS)
HALLIBURTON
MCDERMOTT
OCEANEERING
PETROBRAS
SAIPEM
SAPURAACERGY
SHELLEXPLORATION&PRODUCTION
SUBSEA7
TECHNIP
VECTORINTERNATIONAL
WEATHERFORD
MOFFAT(2000)LTD
REMSCHEIDWAY
JUBILEE
INDUSTRIAL
ESTATE
ASHINGTON
NORTHUMBERLAND
UNITEDKINGDOM
NE638UJ
TEL:+44(0)1670840850
FAX:+44(0)1670810154
EMAIL :[email protected]
WEB:www.moffat2000.com
Moffat2000Ltd.reservetherighttochangetheinformationprovidedinthisdocumentwithoutnotice. Informationinthisdocumentisprovidedas
iswithout
warranty.
Moffat
2000
Ltd
can
assume
no
liability
or
responsibility
for
inaccuracies
or
omissions
in
the
information
provided.