22 w (.)
3/a-
! ~
,2"
'.
..
,.
\
\
\
\ \ \\
J
for sizes under 16" 3/8" toper per foot on diometer
\
\
\
\BOX
COUPLING
\ \ \ ~
\ \ \"
"K\\\
\~\
B O , x .C:RESI.T"J"/ ~ " 2 / A ~ \ N I ~ ' N I ~ , ~r ~,{/" ";~ 5 ,,;,,~/////~ "/
C//'Y
\
j-- 1/2"
tL
,.
\(LEAD) P ~ T C . ~ \
,~_J
&";
,, \
\
\
\
l~/
for sizes 16" end Iorger 1" toper per foot on diometer
"~'7/_PIN.
9~
\
(BOX)
,d
\
(PIPE): /P~#E
\
\BOX
LOAD FLANK PIN (PIPE)
p,N FACE
"
".~S
COUPLING
\
-1- ~" "I- ,~d E" ~; o /
/
7-,./.
PIPE AXIS
I
I
Fig. 1.11" (a) API Buttress thread configuration for 13g3 in. outside diameter and smaller casing; (b) API Buttress thread configuration for 16 in. outside diameter and larger casing. (After API RP 5B1, 1988.)
NL
,,~20" Spec;~l bevel
]n R
L 4 --------
"O
Fig. 1.12" Vallourec VAM casing coupling. (After Rabia, 1987; courtesy of Graham & Trotman)