PVPS Spring 2022 Flanges university slides .pdf

Pressure Vessel

1. © Omar S. Al-Abri
Pressure Vessels and PipingSystem Design
(MEIE5106)
(Piping System Design
Week-14, 1
st
Lecture)
TTasneemPervez
Prof. Tasneem Pervez
[email protected]

2. 2
Weld NeckFlanges
features a long tapered hub that can be
welded with a pipe
used in extreme temperature or pressure
situations
Long Welding NeckFlanges
aresimilartoweldneckflanges,withthe
exceptionthattheneck(taperedhub)is
extendedandactslikeaboringextension.
generallyusedonvessels,columnsor
barrels

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3
Slip On Flanges
Aslip-onflangeisconnectedtothepipe
orthefittingsbytwofilletwelds,one
executedinsideandoneoutsidethe
cavityoftheflange
abitmorefragilethanconnectionsmade
withweldingneckflanges

4. 4
Threaded Flanges
Threadedflangesarejoinedtopipesby
screwingthepipe(whichhasamale
thread,perASMEB1.20.1)ontothe
flange,withoutseamwelds
theyareused,mostly,smallsizepipingin
lowpressureandlow-temperature
applications,likewaterandairutility
services.

5. 5
Socket Weld Flanges
Socketweldflangesareconnectedtopipes
usingasinglefilletweldexecutedonthe
outersideoftheflange(differentfromthe
slip-onflangetypethatrequirestwowelds).
AccordingtoASMEB31.1,toexecutea
flangedconnectionusingasocketweld
flange,thepipeshallbeatfirstinsertedin
thesocketoftheflangeuntilitreachesthe
bottomoftheflange,thenitshouldbelifted
by1.6mmandfinallywelded.

6. 6
blindflangesdonothaveacenterhole,andare
usedtoblindorsealapipeline,avalve/pressure
vesselandblocktheflowofthefluid.
Blind Flanges
NipoFlange WeldoFlange

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ElboFlangeand LateroFlange
Swivel Flange

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Reducing/ Expanding Flange

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15. Thedesignofaflangeinvolvestheselectionofthegasket
(material,type,anddimensions),flangefacing,bolting,hub
proportions,flangewidth,andflangethickness....etc.

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