API 653Tank Inspections with Susan Marie Wenner

65 Pages·2016·9.09 MB·English

by  Hill, Caroline

A P I 6 5 3 Ta n k
I n s p e c t i o n s
w i t h
S u s a n M a r i e W e n n e r
A P I 6 5 3 I n s p e c t i o n
• In-Service Inspection
• Foundation Settlement
• Shell Inspection
• Nozzle and Appurtenances
• Roof Inspection
• Venting Assessment
• Out of Service Inspection
• Bottom Assessment
• Internal Nozzle and Appurtenances
• Columns
• Internal Roof Inspection
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
• Foundation Inspection
• Does containment slope away from tank?
• Is tank adequately supported?
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
• Foundation Inspection
• Is there significant wash out under the tank?
• Are there signs of tank bottom leakage?
• Is the tank chime corroding?
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
• Foundation Inspection
• Is the tank grounded?
• Is the ground cable secured?
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
• Tank settlement can be visually
detected…
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
• Foundation Settlement - Planar
READING SHELL
# FT. DEG (IN) Z U S
1 0 0 -1.00 -0.58 -0.42 -0.71
2 13.74 45.00 -0.50 -0.42 -0.08 0.12
3 27.49 90.00 -0.25 -0.27 0.02 -0.05
4 41.23 135.00 0.00 -0.22 0.22 0.19
5 54.98 180.00 -0.25 -0.29 0.04 0.08
6 68.72 225.00 -0.75 -0.46 -0.29 -0.24
7 82.47 270.00 -0.75 -0.61 -0.14 -0.33
8 96.21 315.00 0.00 -0.66 0.66 0.94
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
• Differential Settlement
 API 653 requires a total of D/10 survey
locations with a minimum of 8.
(L2xYx11)
S 
2(ExH)
Where:
S = maximum permissible deflection inft
L = arc length between measurements
points in ft
YS = yield strength in lb/in2
f
E = Young’s modulus in lb/in2
f
H = tank height in ft
A P I 6 5 3
I n - S e r v i c e I n s p e c t i o n
• Shell Inspection
• Visual Inspection
• Ultrasonic thickness measurement