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ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
INTER SPEC, LLC Environmental Inspections Services 757-622-6299 / Office 312 West 24
th Street, Norfolk, VA 23517 757-622-9103 / Fax
www.interspecllc.net 1-800-546-7853 / Toll Free
Engineering Report – Tank # 2
Prepared for
PENINSULA OIL; Wilco, DE
April 10, 2007
API Standard 653 recommends this document
containing valuable historical information be
retained for the life of the tank.
Signature(s):
__________________________________________________________________
Gary G. Boley, Senior Inspector, API-653 # 020, API-570 # 267, API-510 # 2659
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
EXECUTIVE SUMMARY
An API Standard 653 In-Service inspection of Tank # 2 was completed on April 10, 2007 to
evaluate the tank’s integrity, collect data, and establish a data base for future inspections and
evaluations. A shell service life evaluation performed on the tank shell shows the shell as having
greater than 20 years of remaining life under current conditions. Inspection Results are listed in
section 4.1. Recommendations are listed in section 4.2. All engineering calculations are
provided in Appendix A.
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
CERTIFICATION
The following certification pertains to the inspection of Tank # 2 located at the PENINSULA
OIL facility in Wilco, DE on April 10, 2007.
“I certify under penalty of law that this document and all attachments were prepared by me. The
information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
am aware that there are significant penalties for submitting false information, including the
possibility of fines and imprisonment for knowing violations.”
Signature:
__________________________________________________________________
Gary G. Boley, Senior Inspector, API-653 # 020, API-570 # 267, API-510 # 2659
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
TABLE OF CONTENTS
1.0 Introduction
1.1 Purpose
2.0 References
2.1 American Petroleum Institute
2.2 American Society of Mechanical Engineers
2.3 Code of Federal Regulations
2.4 National Association of Corrosion Engineers
2.5 National Fire Protection Association
2.6 Underwriters Laboratories Inc
3.0 Tank Description
4.0 Inspection
4.1 Results
4.2 Maintenance Recommendations
4.3 Compliance Requirements
4.4 Serviceability
Appendices
A Engineering Calculations
B Engineering Data
C Engineering Drawings
D API Checklists
E Photographs
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
1.0 INTRODUCTION
1.1 Purpose:
1.1.1 This report provides an engineering evaluation of Tank # 2 located at the
PENINSULA OIL facility in Wilco, DE. This report summarizes the results of an
inspection meeting the requirements of API Standard 653 conducted by InterSpec,
LLC. The inspection was completed on April 10, 2007.
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
2.0 REFERENCES
2.1 American Petroleum Institute:
2.1.1 Standard 650, Welded Steel Tanks for Oil Storage
2.1.2 API Standard 653, Tank Inspection, Repair, Alteration, and Reconstruction
2.1.3 API RP 652, Lining of Aboveground Petroleum Storage Tank Bottoms
2.1.4 API RP 651, Cathodic Protection of Aboveground Petroleum Storage Tanks
2.1.5 RP 575, Inspection of Atmospheric and Low-Pressure Storage Tanks
2.1.6 API RP 577, Welding Inspection and Metallurgy
2.1.7 RP 2000, Venting Atmospheric and Low Pressure Storage Tanks
2.1.8 API RP 570, Piping Inspection Code: Inspection, Repair, Alteration, and
Rerating of In-Service Piping Systems
2.2 American Society of Mechanical Engineers Codes:
2.2.1 ASME Boiler and Pressure Vessel Code; Section V, Non-Destructive
Examination
2.2.2 ASME Boiler and Pressure Vessel Code; Section IX, Welding and Brazing
Qualifications
2.3 Code of Federal Regulations:
2.3.1 29 CFR 1910, Process Safety Management
2.3.2 40 CFR 112, Pollution Prevention Regulations
2.4 National Association of Corrosion Engineers:
2.4.1 NACE Recommended Practice, RP0184-91, Repair of Lining Systems
2.4.2 NACE Recommended Practice, RP0193-93, External Cathodic Protection of
On-Grade Metallic Storage Tank Bottoms
2.4.3 NACE Recommended Practice, RP0288-94, Inspection of Linings on Steel
and Concrete
2.5 National Fire Protection Association:
2.5.1 NFPA-30, Flammable and Combustible Liquids Code
2.5.2 NFPA-70, National Electrical Code
2.6 Underwriters Laboratories Inc:
2.6.1 UL-142, Steel Aboveground Tanks for Flammable and Combustible Liquids
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
3.0 TANK DESCRIPTION
3.1 Tank Description:
Owner/Operator: PENINSULA OIL
Location: Wilco, DE
Tank Number: 2
Service: Fuel Oil
Diameter: 43.00 feet
Shell Height: 39.50 feet
Capacity: 429,067 Gallons
Configuration: Vertical
Foundation: Earthen
Construction:
Bottom: N/A
Shell: Butt-Welded
Roof: Lap-Welded
Material:
Bottom: Carbon Steel, Unknown Grade
Shell: Carbon Steel, Unknown Grade
Roof: Carbon Steel, Unknown Grade
Built: Circa 1950
Age: Approximately 57 years
Specific Gravity: 0.90
Operating Limits:
Minimum Metal Temperature: Ambient
Maximum Metal Temperature: 200 ˚F
Minimum Pressure: Atmospheric (no vacuum)
Maximum Pressure: Product
Seismic Zone: 1
Construction Code: API-12C
Inspection Type: API-653 In-Service
Inspection Date: April 10, 2007
Inspector(s): Gary G. Boley, Thomas J. Crowe, Kevin T. Grant
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
4.0 INSPECTION
4.1 Results:
4.1.1 Foundation: The tank sits on an earthen foundation. The foundation was
visually evaluated during the inspection. The foundation is in satisfactory condition.
4.1.2 Containment: The tank sits in an earthen containment floor with earthen dike
walls. The top of the earthen containment wall is two feet or more with proper sloped
walls as per NFPA-30. The containment is sloped to allow for drainage away from the
tank as per the requirement of NFPA-30. The containment was visually evaluated during
the inspection. The size of the containment is of sufficient size to contain a total tank
loss. The containment is structurally sound. The containment has small amounts of
debris present. The containment is in satisfactory condition.
4.1.3 Bottom: The tank bottom was not evaluated during this inspection.
4.1.4 Shell: The shell is constructed of carbon steel. The shell is a butt welded
design consisting of five (5) courses. Visually inspected the exterior of the shell.
Inspected the coating for disbonding, adhesion, deterioration, and discoloration with
minor coating failure present. The shell was evaluated for remaining metal thickness
utilizing ultrasonic technology. Thickness measurements are listed in the engineering
data in Appendix B. A shell service life evaluation performed shows the shell with > 20
years of remaining life under current conditions. The engineering calculations, as per
API Standard 653, for the shell service life evaluation are shown in Appendix A under
“Shell Service Life Evaluation”.
4.1.5 Roof: The roof is constructed of carbon steel. The roof is a cone up lap welded
design consisting of twenty two (22) plates. Evaluated the roof nozzles. Inspected the
vent. Inspected the gauge hatch cover and latch, checked for proper seal integrity and
cover operation. Measured the general thickness throughout the roof utilizing an
ultrasonic thickness tester. Thickness measurements are listed in the engineering data in
Appendix B.
4.1.6 Appurtenances: Inspected and evaluated each shell nozzle. Indentified the
type and use of each shell nozzle. Measured the nozzle neck thickness on all accessible
shell nozzles. Evaluated all nozzles and reinforcement plates for leaks and corrosion.
Moderate corrosion is present around the roof light access. Evaluated the ATG and its
operation. The tank has means of grounding via ground straps. Inspected the spiral
stairway. Evaluated the handrails, platforms and frames for corrosion and structural
soundness, their conditions are satisfactory.
4.1.7 Painting/Insulation: The tank shell, roof, stairway, handrails, piping, and
appurtenances are coated. Moderate coating failure is present around the roof light
access and moderate corrosion where coating has failed. Minor coating failure is present
on the roof.
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
4.2 Maintenance Recommendations:
4.2.1 Foundation: None.
4.2.2 Containment: Remove debris from the containment area.
4.2.3 Bottom: None.
4.2.4 Shell: See Painting/Insulation section.
4.2.5 Roof: See Painting/Insulation section.
4.2.6 Appurtenances: See Painting/Insulation section.
4.2.7 Painting/Insulation: Mechanically clean and recoat the areas of coating failure
on the roof and the roof light access. All coating repairs should be accomplished using
an epoxy based coating system.
4.3 Compliance Requirements:
4.3.1 Foundation: None.
4.3.2 Containment: None.
4.3.3 Bottom: None.
4.3.4 Shell: None.
4.3.5 Roof: None.
4.3.6 Appurtenances: None.
4.3.7 Painting/Insulation: None.
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
4.4 Serviceability:
Tank # 2 is in compliance with the requirements of API Standard 653 for structural
integrity, and the following schedule may be implemented:
4.4.1 The next visual inspections should be accomplished by a Certified API-653
Inspector prior to April, 2012 in accordance with API Standard 653.
4.4.2 The next ultrasonic thickness measurement inspections should be accomplished
by a Certified API-653 Inspector prior to April, 2022 in accordance with API Standard
653.
4.4.3 The next internal inspection should be accomplished by a Certified API-653
Inspector prior to July, 2022 in accordance with API Standard 653.
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
Appendix A
Engineering Calculations
1. Shell Service Life
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
Shell Life Evaluation
To determine the remaining shell service life and maximum inspection intervals, calculate the corrosion
rate and remaining corrosion allowance for each shell course using the following:
SE
DGHt
)1(6.2min SE
DGHt
)(6.2min
API-653 4.3.3.1a API-653 4.3.3.1b
Y
ttC
actprev
r r
actut
C
ttI
2
min
r
actv
C
ttI
4
min
Where:
tmin = The minimum acceptable shell thickness for each course, in inches; however, tmin shall not be
less than 0.1 inch for any tank course.
tnorm = The nominal shell thickness, in inches.
tact = The current measured shell thickness, excluding pits and corrosion, in inches.
tprev = The previous measured shell thickness, excluding pits and corrosion or tnorm, in inches.
D = The nominal diameter of the tank, in feet.
H = The height from the bottom of each shell course to the maximum liquid level, in feet.
Hc = The calculated safe fill height, in feet, for the current product.
G = The highest specific gravity of the contents.
Y = Specified minimum yield strength of the plate; use 30,000 pounds per square inch if not
known (N/A for riveted tanks).
T = The smaller of the specified minimum tensile strength of the plate or 80,000 pounds per
square inch; use 55,000 psi if not known (N/A for riveted tanks).
S = The maximum allowable stress, in pounds per square inch. For welded tanks, use the smaller
of 0.80Y or 0.429T for the bottom and the second course or the smaller of 0.88Y or 0.472T for
all other courses. For riveted tanks, use S = 21,000 psi. For elevated temperatures above
200OF, the maximum allowable stress shall be the smaller of 2/3 the minimum yield strength
multiplied by the M-factor (M) of API-650 Appendix M or the product design stress value
listed in Table 3-2 of API-650.
E = The original joint efficiency for the tank. Use Table 2-1 from API Standard 653 if original E is
unknown; E = 1.0 when evaluating the retirement thickness in a corroded plate, when away
from welds or joints by at least the greater of one inch or twice the plate thickness. For riveted
tanks, use E = 1.0 for shell plates when greater than 6 inches from rivets; use the value of E
from API-653 Table 2-1 when within 6 inches of rivets.
Cr = The shell corrosion rate, in inches per year.
Iut = The inspection interval for the next ultrasonic inspection, in years (not to exceed 15 years).
Iv = The inspection interval for the next visual external inspection, in years (not to exceed 5 years).
ΔY = The years between the previous measured shell thickness (tprev) and the current measured shell
thickness (tact), in years.
InterSpec, LLCRev.21505-1
4/10/ 2007
Tank #: 2
Plate Specification: Unknown T 55,000
Material: Y 30,000
Manufactured Date: 1950 circa 23595
Tank Specification Unit 25960
D 43.000 feet 0.80Y 0.429T
HTank 39.500 feet Smaller of 24000 23595
HProduct 39.50 feet the two: 0.88Y 0.472T
G 0.90 N/A 26400 25960
E 1 N/A *Smaller of Two specified minimum or 80,000(lb/in²)
ΔY 57 years
Maximum Previous Current 2, 3 MinimumProduct Allowable Measured Measured Acceptable Corrosion 1 Remaining Next VT Next UT Max Fill
Course Height Stress Joint Thickness Thickness Thickness Rate Life Inspection Inspection Height
Course Height Ft (psi) Efficiency (inches) (inches) (inches) (in./yr) (ca .) (years) (years) (feet)
No. (feet) (feet) (S ) (E ) (t prev) (t act) (t min) (C r) (years) (I v) (I ut)
1 7.500 39.500 23,595 1.00 0.250 0.249 0.164 0.00002 >20 5 5 39.50
2 8.000 31.500 23,595 1.00 0.250 0.247 0.130 0.00006 >20 5 5 39.50
3 8.000 23.500 25,960 1.00 0.250 0.246 0.100 0.00007 >20 5 5 39.50
4 8.000 15.500 25,960 1.00 0.250 0.248 0.100 0.00003 >20 5 5 39.50
5 8.000 7.500 25,960 1.00 0.250 0.246 0.100 0.00006 >20 5 5 39.50
NOTE:
2 Acceptable roof thickness in any
100in.
2 shall not be less than 0.090 in
3 UL-142 Section 17.2.1 , 25.1, and 13.2.1 for Horz./Vertical and rectangular tanks <50,000 gal and
>50,000 gal. API 653 Section 4.3.2.1, 4.3.4.1 and 4.4.1
Current Maximum Safe Fill Height is not restricted.
Carbon Steel Specified minimum yield strength(lb/in ²)
Specified minimum tensile strength *(lb/in²)
Shell Life Evaluation : Data Result
Owner/Operator:
Inspection Date :
Peninsula Oil; Wilco Terminal - Seaford, DE
1The engineering data used to calculate in-service period of operation (Remaining Life) assumes the tank remains in the
same service and all corrosion rates remain constant.
All other course
SMaximum allowable stress, first and second (lb/in ²)
Maximum allowable stress, for all other (lb/in²)
Bottom and second course
0.000
0.050
0.100
0.150
0.200
0.250
0.300
1 2 3 4 5
inch
es
Course #
Shell Life Evaluation
tprev
tact
tmin
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
Appendix B
Engineering Data
1. Tank UT Readings
2. Nozzle UT Readings
InterSpec,LLCRev.21505-1
DATA Sheet : 1 Tank # 2
1 0.184 1 0.249 1 NA
2 0.183 2 0.248 Average
3 0.183 3 0.248 Std.Dev.
4 0.184 4 0.249
5 0.184 5 0.249
6 0.187 6 0.248
7 0.184 7 0.249
8 0.187 8 0.249
9 0.184 9 0.249
10 0.187 10 0.248
11 0.182 11 0.244
12 0.187 12 0.250
13 0.187 13 0.248
14 0.185 14 0.249
15 0.182 15 0.249
16 0.185 16 0.245
17 0.182 17 0.246
18 0.187 18 0.245
19 0.184 19 0.243
20 0.187 20 0.249
21 0.182 21 0.247
22 0.183 22 0.246
23 0.183 23 0.244
24 0.182 24 0.246
25 0.186 25 0.245
26 0.186 26 0.245
27 0.185 27 0.246
28 0.187 28 0.247
29 0.183 29 0.248
30 0.186 30 0.245
Average 0.185 31 0.249
Std.Dev. 0.001868062 32 0.248
33 0.250
34 0.250
35 0.247
36 0.249
37 0.246
38 0.247
39 0.249
40 0.246
41 0.244
42 0.247
43 0.247
44 0.246
45 0.248
46 0.244
47 0.248
48 0.248
49 0.248
50 0.244
Average 0.247
Std.Dev. 0.001877471
Owner/Operator:
Roof UT Readings Shell UT Readings Floor UT Readings
Peninsula Oil; Wilco Terminal - Seaford, DE
InterSpec,LLCRev.21505-2
1 0.249 1 0.244 1 0.247
2 0.248 2 0.250 2 0.246
3 0.248 3 0.248 3 0.244
4 0.249 4 0.249 4 0.246
5 0.249 5 0.249 5 0.245
6 0.248 6 0.245 6 0.245
7 0.249 7 0.246 7 0.246
8 0.249 8 0.245 8 0.247
9 0.249 9 0.243 9 0.248
10 0.248 10 0.249 10 0.245
1 0.249 1 0.244 1 NA
2 0.248 2 0.247 2
3 0.250 3 0.247 3
4 0.250 4 0.246 4
5 0.247 5 0.248 5
6 0.249 6 0.244 6
7 0.246 7 0.248 7
8 0.247 8 0.248 8
9 0.249 9 0.248 9
10 0.246 10 0.244 10
1 NA 1 NA 1 NA
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 7 7
8 8 8
9 9 9
10 10 10
Shell 7
Shell 8
Shell 9
Shell Drop (UT Readings) All Course
DATA Sheet : 1 (Continued)
Shell 6
Shell 1
Shell 2
Shell 3
Shell 4
Shell 5
InterSpec,LLCRev.21505-3
DATA Sheet: 2 Tank #:
1 0.249 1 0.270 1 0.264 1 0.211
2 0.249 2 0.267 2 0.261 2 0.214
3 0.247 3 0.271 3 0.261 3 0.211
4 0.250 4 0.267 4 0.261 4 0.211
Average 0.249 Average 0.269 Average 0.262 Average 0.212
1 0.253 1 NA 1 0.212 1
2 0.252 2 2 0.208 2
3 0.257 3 3 0.209 3
4 0.257 4 4 0.213 4
Average 0.255 Average Average 0.211 Average
Nozzle GNozzle FNozzle E
2
Owner/Operator:
Tank Nozzles UT Readings
Nozzle A Nozzle B Nozzle C Nozzle D
Peninsula Oil; Wilco Terminal - Seaford, DE
0.100
0.110
0.120
0.130
0.140
0.150
0.160
0.170
0.180
0.190
0.200
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29
inch
es
Data Points
Roof UT Readings
0.200
0.210
0.220
0.230
0.240
0.250
0.260
0.270
0.280
1 6 11 16 21 26 31 36 41 46
inch
es
Data Points
Shell UT Reading
0.200
0.220
0.240
0.260
0.280
0.300
0.320
0.340
0.360
0.380
0.400
1 6 11 16 21 26 31 36 41 46 51 56
inch
es
Data Points
Floor UT Reading
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
Appendix C
Engineering Drawings
1. Shell Layout
2. Roof Layout
Remarks/Legend:
Drawing Title: Tank Description:
Date: Rev. No.: Scale:
Drawn By:
Company:
4/10/2007 N/AInterSpec, LLC
N/A
Peninsula Oil Co., Inc.; Wilco, DEA - 20" ManholeB - 6" ProductC - 6" ProductD - 3"/2" Water Draw
AB C
1-1
39.5'
D
E1-2 1-3
2-1 2-2 2-3
3-1 3-2 3-3
4-1 4-2 4-3
5-5 5-1 5-2 5-3F
41
E - 20" ManholeF - 4" Plug
ATG
ATG
F
ED
BA C
2-5
3-5
Remarks/Legend:
Drawing Title: Tank Description:
Date: Rev. No.: Scale:
Drawn By:
Company:
4/10/2007 N/AInterSpec, LLC
N/A
Peninsula Oil Co., Inc.; Wilco, DEG - 3"/2" Water Draw
1-4
39.5'
G
1-5
2-4 2-5
3-4 3-5
4-4 4-5
5-3 5-4 5-5
14
2-3
3-3
G
Remarks/Legend:
Drawing Title: Tank Description:
Date: Rev. No.: Scale:
Drawn By:
Company:
4/10/2007 N/AInterSpec, LLC
N/A
Peninsula Oil Co., Inc.; Wilco, DEA - 20" Light HatchB - 20" Bolted Access
A
B
C - 1-1/4" Scaffold SupportD - 6" Breather
E - 8" Gauge HatchF - 20" Bolted Access
D
E
F
C
F
D
E
C
B
A
8 x 19-1/2"
InterSpec, LLCREV.112104-1
a. NA
a. X
b. X
c. X
d. X
e. X
a. NA
b. NA
a. NA
a. NA
a. X
b. X
a. X
a. X
b. X
c. X
a. NA
a. NA
b. NA
c. NA
d. NA
e. NA
a.NA
b. NA
c. NA
a. X
b. X
c. X
d. NA
e. NA
Inspect the bottom-to-foundation seal.
Inspect vertical seams to see if they have been full fillet lap welded to increase joint efficiency.
If no record exists of vertical riveted seams, dimension and sketch (or photograph) the rivet pattern: number of rows, rivet size, pitch
length, and note whether the joint is butt riveted or lap riveted.
Inspect wind girder and handrail for corrosion damage (paint failure, pitting, corrosion product buildup), especially where it occurs at tack
welded junctions, and for broken welds.
C.1.3 SHELL APPURTENANCES
C.1.3.1 Manways and Nozzles
Inspect for cracks or signs of leakage on weld joints at nozzles, manways, and reinforcing plates.
Inspect for shell plate dimpling around nozzles, caused by excessive pipe deflection.
Inspect for flange leaks and leaks around bolting.
Check operating condition of dike drains.
Inspect the area for buildup of trash, vegetation, and other inflammables buildup.
Visually inspect for paint failures, pitting, and corrosion.
Clean off the bottom angle area and inspect for corrosion and thinning on plate and weld.
C.1.1.6 Housekeeping
C.1.2 SHELLS
C.1.2.1 External Visual Inspection
Look for areas where leaching of oil has left rock filler exposed, which indicates hydrocarbon leakage.
Check for settlement into the base which would direct runoff rain water under the tank rather than away from it.
Check site for drainage away from the tank and associated piping and manifolds.
C.1.1.4 Rock
C.1.1.5 Site Drainage
C.1.1.3 Oiled Dirt or Sand
Presence of crushed rock under the steel bottom usually results in severe underside corrosion. Make a note to do additional bottom plate
examination (ultrasonic, hammer testing or turning of coupons) when the tank is out of service.
Inspect for cavities under foundation and vegetation against bottom of tank.
Check that runoff rainwater from the shell drains away from the tank.
Check for settlement around perimeter of tank.
Check for settling of tank into asphalt base which would direct runoff rain water under the tank instead of away from it.
C.1.1.2 Asphalt
Inspect drain openings in ring, back of waterdraw basins and top surface of ring for indications of bottom leakage.
C.1.1 FOUNDATION
C.1.1.1 Concrete Ring
Inspect for broken concrete, spalling and cracks, particularly under backup bars used in butt welded annular rings under the shell.
Table C-1: Tank In-Service Inspection Checklist
Measure foundation levelness and bottom elevations (see Appendix B for extent of measurements).
C.1.2.4 Wind Girder (Floating Roof Tanks)
C.1.2.2 Internal (Floating Roof Tank)
C.1.2.3 Riveted Shell Inspection
Visually inspect for grooving, corrosion, pitting, and coating failures.
Inspect external surface for rivet and seam leaks.
Locate leaks by sketch or photo (location will be lost when shell is abrasively cleaned for painting).
Inspect rivets for corrosion loss and wear.
Inspect sealing of insulation around manways and nozzles.
Check for inadequate manway flange and cover thickness on mixer manways.
Check support welds to shell for pitting, especially on shell plates.
Note whether supports have reinforcing pads welded to shell.
InterSpec, LLCREV.112104-2
a. X
b. NA
c. X
d. X
e. NA
f. X
g. NA
h. NA
a. X
b. X
c. NA
d. NA
e. NA
f. NA
g. NA
h. NA
i. NA
a. NA
b. NA
c. NA
a. NA
a. NA
b. NA
c. NA
a. NA
b. NA
c. NA
a. NA
a. NA
a. NA
b. NA
a. NA
On floating roof tanks, when the roof is in the lowest position, check that no more than two feet of tape are exposed at the end of the tape
guide.
Check for anchored piping which would be hazardous to the tank shell or bottom connections during earth movement.
C.1.3.3 Autogauge System
Identify size and construction material of autogauge tape guide (floating roof tanks).
Inspect for proper mounting flange and support.
Check for leaks at threaded and flanged joints.
C.1.3.8 Swing Lines: External Guide System
Check for water or gravity differences that would indicate a leaking swing joint.
C.1.3.11 Swing Lines: Product Sample Comparison
For non-stainless steel cable, check for corrosion over entire length.
All cable: check for wear or fraying.
Inspect for leakage.
Inspect condition of power lines and connections to mixer.
C.1.3.9 Swing Lines: Identify Ballast Varying Need
Test bracing and supports of sample system lines and equipment.
Inspect condensate drain for presence of oil indicating leakage.
C.1.3.5 Heater (Shell Manway Mounted)
C.1.3.6 Mixer
Nonfloating. Raise, then lower the swing line with the winch, and check for cable tightness to confirm that swing line lowered properly.
Floating. With tank half full or more, lower the swing line, then let out cable and check if swing has pulled cable tight, indicating that the
winch is operating properly.
Check circulation pump for leaks and operating problems.
C.1.3.4 Shell-Mounted Sample Station
Inspect sample lines for function of valves and plugging of lines, including drain or return-to-tank line.
Target should indicate direction of swing opening (up or down) and height above bottom where suction will be lost with swing on bottom
support.NAa.
Indicator. Check that the indicator moves in the proper direction: Floating swing line indicators show a lower level as cable is wound up
on the winch. Non-floating swing line indicators show the opposite.
C.1.3.10 Swing Lines: Cable Material and Condition
Check for significant difference in stock specific gravity.
C.1.3.12 Swing Lines: Target
Inspect condition of board and legibility of board-type autogauges.
Test freedom of movement of marker and float.
Table C-1: Tank In-Service Inspection Checklist
Inspect manifold piping, flanges, and valves for leaks.
Inspect fire fighting system components.
C.1.3.2 Tank Piping Manifolds
C.1.3.7 Swing Lines: Winch Operation
Check for adequate thermal pressure relief of piping to the tank.
Compare actual product level to the reading on the autogauge (maximum variation is 2 inches).
Ask operator if tape tends to hang up during tank roof movement (floating roof tanks).
Check operation of regulators for tanks with purge gas systems.
Check sample connections for leaks and for proper valve operation.
Check for damage and test the accuracy of temperature indicators.
Check welds on shell-mounted davit clips above valves 6 inches and larger.
Inspect autogauge tape guide and lower sheave housing (floating swings) for leaks.
Inspect autogauge head for damage.
Bump the checker on autogauge head for proper movement of tape.
InterSpec, LLCREV.112104-3
a. NA
a. NA
a. NA
a. NA
a. NA
a. NA
b. NA
c. NA
a. NA
b. NA
c. NA
d. NA
e. NA
f. NA
g. NA
h. NA
i. NA
j. NA
a. NA
b. NA
c. NA
d. NA
e. NA
f. NA
g. NA
h. NA
a. NA
b. NA
c. NA
d. NA
e. NA
On ultra clean stocks such as JP4, check for presence and condition of protective coating or liner inside sample hatch (preventing rust
from pipe getting into sample).
C.1.4.2 Deck Plate External Corrosion
Visually inspect for paint failure, holes, pitting, and corrosion product on the roof deck.
C.1.4.3 Roof Deck Drainage
Remove small test sections of insulation and check roof deck for corrosion and holes near the edge of the insulated area.
C.1.4.7 Floating Roof Seal Systems
Table C-1: Tank In-Service Inspection Checklist
Inspect for wet insulation under the weather coat.
At several locations, measure distance from roof rim to a horizontal weld seam above the roof. A variance in the readings
indicates a nonlevel roof with possible shell out-of-round, out-of-plumb, leaking pontoons or hangup. On small diameter tanks,
an unlevel condition can indicate unequal loading at that level.
Test for explosive gas on top of the internal floating roof. Readings could indicate a leaking roof, leaking seal system or
inadequate ventilation of the area above the internal floating roof.
Visually inspect for cracks or leaks in the insulation weather coat where runoff rain water could penetrate the insulation.
Look for indication of standing water. (Significant sagging of fixed roof deck indicates potential rafter failure. Large standing
water areas on a floating roof indicate inadequate drainage design or, if to one side, an unlevel roof with possible leaking
pontoons).
C.1.4 ROOFS
C.1.4.1 Deck Plate Internal Corrosion
For safety, before accessing the roof, check with ultrasonic instrument or lightly use a ball peen hammer to test the deck plate near the
edge of the roof for thinning. (Corrosion normally attacks the deck plate at the edge of a fixed roof and at the rafters in the center of the
roof first.)
C.1.4.6 Roof Insulation
at low pump out
at midshell
at high liquid level
Measure and record maximum seal-to-shell gaps:
C.1.4.4 Level of Floating Roof
C.1.4.5 Gas Test Internal Floating Roof
Check if seal fabric on primary shoe seals is pulling shoes away from shell (fabric not wide enough).
Inspect fabric for deterioration, holes, tears, and cracks.
Inspect visible metallic parts for corrosion and wear.
Measure and record annular space at 30 foot spacing (minimum of 4 quadrants) around roof and record. Measurements should be taken in
directly opposite pairs. (a.) ,Opposite pair 1; (b) ,Opposite pair 2
Inspect for openings in seals that would permit vapor emissions.
Inspect for protruding bolt or rivet heads against the shell.
Pull both primary and secondary seal systems back all around the shell to check their operation.
Inspect secondary seals for signs of buckling or indications that their angle with the shell is too shallow.
C.1.5 ROOF APPURTENANCES
Inspect wedge-type wiper seals for flexibility, resilience, cracks and tears.
Inspect visible portion of the gauge well for thinning, size of slots, and cover condition.
C.1.5.1 Sample Hatch
Inspect condition and functioning of sample hatch cover.
Test operation of system.
Check for corrosion and plugging on thief and gauge hatch cover.
Check for reinforcing pad where sample hatch pipe penetrates the roof deck.
On tanks governed by Air Quality Monitoring District rules, check for the condition of seal inside hatch cover.
Where sample hatch is used to reel gauge stock level, check for marker and tab stating hold off distance.
On floating roof sample hatch and recoil systems, inspect operation of recoil reel and condition of rope.
C.1.5.2 Gauge Well
Check for a hold off distance marker and tab with hold off distance (legible).
If tank has a gauge well washer, check valve for leakage and for presence of a bull plug or blind flange.
On floating roofs, inspect condition of roof guide for gauge well, particularly the condition of the rollers for grooving.
If accessible, check the distance from the gauge well pipe to the tank shell at different levels.
InterSpec, LLCREV.112104-4
a. NA
a. NA
b. NA
a. NA
b. NA
a. NA
b. NA
c. NA
a. NA
a. NA
a. NA
a. NA
a. NA
a. NA
b. NA
a. NA
b. NA
c. NA
a. X
b. X
c. X
d. X
e. NA
f. NA
a. X
b. X
c. NA
d. NA
e. X
a. X
b. NA
c. NA
d.NA
Identify and report type (steel pipe, galvanized pipe, square tube, angle) and size of handrails.
Inspect for pitting and holes, paint failure.
Check reinforcing pads where supports are attached to shell or roof.
Inspect the surface that deck plate or grating rests on for thinning and holes.
Inspect the attachment of frame to supports and supports to tank for corrosion and weld failure.
C.1.6.2 Platform Frame
Inspect attachment welds.
Identify cold joints and sharp edges. Inspect the handrails and midrails.
Inspect safety drop bar (or safety chain) for corrosion, functioning and length.
Inspect frame for corrosion and paint failure.
When equipped with a recoil reel opening device, check for proper operation.
Check condition of screens, locking and pivot pins.
Check for leg racks on roof.
C.1.5.8 Gauging Platform Drip Ring
C.1.5.9 Emergency Roof Drains
C.1.5.7 Roof-Mounted Vents (Internal Floating Roof)
Check grating tie down clips. Where grating has been retrofitted to replace plate, measure the rise of the step below and above the grating
surface and compare with other risers on the stairway.
Check the hatch for corrosion and missing bolts.
Look for corrosion on the tape guide's and float guide's wire anchors.
Check overall conditions.
C.1.5.3 Fixed Roof Scaffold Support
Inspect for corrosion.
Check tape cable for wear or fraying caused by rubbing on the cover.
C.1.5.10 Removable Roof Leg Racks
C.1.5.4 Autogauge: Inspection Hatch and Guides (Fixed Roof)
Inspect scaffold support for corrosion, wear, and structural soundness.
Table C-1: Tank In-Service Inspection Checklist
C.1.5.6 Sample Hatch (Internal Floating Roof)
C.1.5.12 Rim Vents
C.1.5.13 Pontoon Inspection Hatches
Check condition of the screen on the rim vent cover.
Check for plating off or removal of rim vents where jurisdictional rules do not permit removal.
C.1.5.11 Vacuum Breakers
On fixed roof tanks with drip rings under the gauging platform or sampling area, inspect for plugged drain return to the tank.
Inspect vapor plugs for emergency drain: that seal fabric discs are slightly smaller than the pipe ID and that fabric seal is above the liquid
level.
Report size, number and type of vacuum breakers. Inspect vacuum breakers. If high legs are set, check for setting of mechanical vacuum
breaker in high leg position
When equipped with a fabric seal, check for automatic sealing after sampling.
Inspect the handrail between the rolling ladder and the gauging platform for a hazardous opening when the floating roof is at its lowest
level.
Check that flat-surface to flat-surface junctures are seal welded.
Inspect plate-to-frame weld for rust scale buildup.
Inspect grating for corrosion-caused thinning of bars and failure of welds.
Inspect deck plate for corrosion-caused thinning or holes (not drain holes) and paint failure.
C.1.6.3 Deck Plate and Grating
C.1.6.1 Handrails
C.1.6 ACCESSWAYS
Open pontoon inspection hatch covers and visually check inside for pontoon leakage.
Test for explosive gas (an indicator of vapor space leaks).
If pontoon hatches are equipped with locked down covers, check for vent tubes. Check that vent tubes are not plugged up. Inspect lock
down devices for condition and operation.
C.1.5.5 Autogage: Float Well Cover
InterSpec, LLCREV.112104-5
a. NA
b. NA
c. NA
a. NA
b. NA
c. NA
d. NA
e. NA
f. NA
g. NA
h. NA
i. NA
j. NA
k. NA
l. NA
m. NA
C.1.6.4 Stairway Stringers
Table C-1: Tank In-Service Inspection Checklist
Inspect spiral stairway stringers for corrosion, paint failure and weld failure. Inspect attachment of stairway treads to stringer.
Inspect steel support attachment to concrete base for corrosion.
C.1.6.5 Rolling Ladder
Inspect stairway supports to shell welds and reinforcing pads.
Inspect rolling ladder stringers for corrosion.
Identify and inspect ladder fixed rungs (square bar, round bar, angles) for weld attachment to stringers and corrosion, particularly where
angle rungs are welded to stringers.
Inspect top surface of rolling ladder track for wear by wheels to assure at least 18 inches of unworn track (track long enough).
Inspect rolling ladder wheels for freedom of movement, flat spots and wear on axle.
Inspect alignment of rolling ladder with roof rack.
Check for wear and corrosion where rolling ladder attaches to gauging platform.
Inspect pivot bar for wear and secureness.
Inspect operation of self-leveling stairway treads.
Inspect for corrosion and wear on moving parts.
Inspect rolling ladder track welds for corrosion.
Inspect track supports on roof for reinforcing pads seal welded to deck plate.
If rolling ladder track extends to within five feet of the edge of the roof on the far side, check for a handrail on the top of the shell on that
side.
Check by dimensioning, the maximum angle of the rolling ladder when the roof is on low legs. Maximum angle. __________
ER-PENINSULA OIL-WILCO, DE-TANK#2-APRIL/2007
20" manway
Coating failure and corrosion around chime
CP test station