Understanding APIICP653 Reading 2-650-Selected Reading

D O
D P
D R
D R /2
1
1
D
W
P
D R
L
Arc distance
L
One 6 mm ( 1 /4 in.) telltale hole
in reinforcing plate,
on horizontal centerline
Bend reinforcing plate to
radius of tank shell
Alternative shape
for low-type nozzles
D R /2
See Detail A or B for
bottom edge
Diamond
Reinforcing Plate
Circular
Q
J
t
T
Q
J
J
t
T
Q
Q
J
J
t
T
OD
OD
OD
(See Figure 5-7b)
(See Figure 5-7b)
(See Figure 5-7b)
B
H N
B
Tank bottom
B
Victaulic groove
or threads
Single Flange
Double Flange
Regular-type Flanged Nozzles, NPS 3 or Larger
(Bolt holes shall straddle flange centerlines)
Special Flange
Nozzle C L
(See Figure 5-7b)
C
Chip
T
t
(See Note 1) (See Note 1)
T
t
(See Note 1)
t /2 [6 mm ( 1 /4 in.) minimum]
NOTES
1. See 5.1.5.7 for information on the size of welds.
2. See 5.8.9 for information on the couplings used in shell nozzles.
3. Nozzles NPS 3 or larger require reinforcement.
60º
Detail A
Detail B
Low-type Flanged Nozzles, NPS 3 or Larger
(Bolt holes shall straddle flange centerlines)
(See Note 5)
•
4. Details of welding bevels may vary from those shown if agreed to
by the Purchaser.
5. Shop weld not attached to bottom plate.
6. See 5.7.6.2 for information on supplying nozzles flush or with an
internal projection.
Figure 5.8—Shell Nozzles (see Tables 5.6a, 5.6b, 5.7a, 5.7b, 5.8a, and 5.8b)