Welded Steel Tanks for Oil Storage

3-16 API STANDARD 650
D R
/2
1
D R
/2
1
W
D P
DR
;;;;;
;;;;;
;;;;;
;;;;;
;;;;;
;;;;;
L
Arc distance
L
One 6 mm ( 1 /4") telltale hole
in reinforcing plate,
on horizontal centerline
Bend reinforcing plate to
radius of tank shell
Alternative shape
for low-type nozzles
See Detail a or b for
bottom edge
D O
D P
D R
;;;;;
;;;;;
;;;;;
;;;;;
;;;;;
Diamond
REINFORCING PLATE
;
;
J
;
J
J
;
J
J ;; t
t
t
;;
;;
Q ;;;
Q ;;;
Q
Q ;;;
T
T
T
;; ;;;
;; ;;;
;;; ;;; ;;;
;; ;;;
;; ;;;
;;; ;;; ;;;
;;;;;;
;;;;;;;;;
;
; ;
;;;;;;;;;
; ;
; ;
;
; ;;
;
OD
OD
OD
; ;
;
; ;;
;
; ; (See Figure 3-4B)
; (See Figure 3-4B) ; ;;(See Figure 3-4B) ;
; ;
;
; ;;
;
;;;;;;
;;;;;;;;;
;
; ;
;;;;;;;;;
; ;
;; ;;;
H N ;; ;;;
;;; ;;; ;; ;
;; ;;;
;; ;;;
;;; ;;; ;; ;
;;;
;;;
Tank bottom
;; ;
B ;;
B ;;
B
;;;;;;
;;
Single Flange
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
Double Flange
REGULAR-TYPE FLANGED NOZZLES, NPS 3 OR LARGER
(Bolt holes shall straddle flange centerlines)
Circular
Special Flange
Victaulic groove
or threads
;;
;;
;;
;;
;;
;;
;;
Nozzle C L
Chip
(See Figure 3-4B)
;;;; ;;;;
;;;;
;;;
;;;;
;;
;;;
;;
C
;;
T
;
;;
T
;;;
;;
t
;;;
;;;
;; ;;; ;;;;;
t
;;
(See Note 1) (See Note 1)
;;
;;
;;
;;
;;
;;
;;
Detail a
Notes:
1. See 3.1.5.7 for information on the size of welds.
2. See 3.8.8 for information on the couplings used in shell nozzles.
3. Nozzles NPS 3 or larger require reinforcement.
Detail b
(See Note 1)
Figure 3-5—Shell Nozzles (See Tables 3-6, 3-7, and 3-8)
60°
;;
;;
;;
;;
;;
;;
;;
LOW-TYPE FLANGED NOZZLES, NPS 3 OR LARGER
(Bolt holes shall straddle flange centerlines)
●
t /2 [6 mm ( 1 /4") minimum]
(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.