Crude oil Storage Tanks-Basics
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![Page 1: Crude oil Storage Tanks-Basics](https://reader034.fdocuments.in/reader034/viewer/2022050709/55319a12550346a10b8b4b2a/html5/thumbnails/1.jpg)
Above Ground Storage Tank Design, Inspection, and Compliance
Management
By Gregory Coppola, P.E.
Kinder Morgan Energy Partners,
L.P.
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Introduction
• Kinder Morgan Overview
– Midstream Energy Company
– 900+ Storage Tanks in Pacific Region
– Critical Infrastructure for Fuel Distribution
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Completed New Tanks
El Paso, TX
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Organization of the Presentation
• Objective of the Presentation
• API Recommended Practice
• Tank Construction and Tank Components
• Out-of-Service Inspections
• Regulatory Framework
– SPCC Rule
– APSA
– DOT Regulations
– Air Regulations – Federal and Local
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Objective of the Presentation
• Provide CUPA members with an overview
of petroleum storage tanks.
• Provide an introduction to applicable
regulations.
• Assist with CUPA regulation under
Assembly Bill 1130, The Aboveground
Petroleum Storage Act.
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Aboveground Petroleum Storage Act (APSA),
Assembly Bill 1130
Effective January 1, 2008
• Transfers the responsibility for the
implementation, enforcement and administration
of the Aboveground Petroleum ACT (APSA)
from the State Water Resources Control Board
(SWRCB) to the CUPA’s.
• California Health and Safety Code Chapter 6.67,
Sections 25270 – 25270.13 are also known as
the APSA.
• APSA will be discussed in more detail later in
the presentation.
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API Recommended Practices
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API Recommended Practices
API 650
• API 650 – Design Standard for welded steel tanks for oil and fuel storage.
• Typically used for large field fabricated storage tanks operating at low pressures or atmospheric pressures.
• The standard covers materials of construction, design, fabrication/erection, construction inspection, and welding procedures.
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API 650
Welded Tanks for Oil Storage • Scope
• Reference
• Definitions
• Materials
• Design
• Fabrication
• Erection
• Methods of Inspection
• Welding Procedures
• Marking
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Tank Schematics
• The following schematics show the various
appurtenances for:
– Cone Roof Tanks
– Internal Floating Roof (IFR) Tank with Top
Foam Injection and Vapor Recovery
– Cable Suspended IFR
– External Floating Roof (EFR)
– EFR with Dome
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Cone Roof Tank
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IFR Tank w/Top Foam and Vapor Recovery
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Cable Suspended Internal Floating Roof
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External Floating Roof Tank
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EFR Tank with Aluminum Dome
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Tank Foundations
• Foundation Types
– Earth Foundations
– Gravel/Asphalt Surface
– Ring Walls
– Slab
– Piles with Ring or Slab Caps
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Tank Foundations (Con’t)
• Design Concepts
– Vertical Loading
• Liquid pressures
• Shell and roof loads
– Overturning
• Wind
• Seismic
– Foundation Settlement
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Liner Installation
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Foundation Rebar
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Concrete Tank Foundation
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Tank Bottoms
• Constructed of overlapping steel plates.
• Plates joined by manual or automatic arc
welding techniques.
• Tank bottom to shell welds undergo the
most stress and are considered critical
welds.
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Tank Bottom – In Progress
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View of Tank Bottom Beneath IFR Includes Center
Column, Roof Legs, and Reinforcing Pads
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Tank Double Bottoms
• Typical components (starting from below)
– Lower tank bottom
– HDPE liner
– Sand or concrete with drainage system
– Upper tank bottom
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Shell Design
• Tank shells are constructed from courses of steel plates.
• The designer will calculate a steel thickness for each course.
• The bottom courses are thicker steel due to hydrostatic pressure.
• Shell design criteria include hydrostatics and wind buckling.
• Thickness includes corrosion allowance.
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Construction of First Course –
Crane Inside
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Construction of First Course
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Hanging Plate for 4th Shell Course
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Nozzles and Penetrations
• Openings in the shell result in higher
stress.
• Repads or thickened inserts may be
required.
• Stress relieving may be required.
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Manway with Davit Arm
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Fixed Roof Types
• Self-supported
– Cones
– Domes and Umbrellas with stiffeners
• Supported Cone Roofs
– Columns are inside tank
• Aluminum Geodesic Domes
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Roof Construction – Bull Wheel
and Center Column
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Roof Rafter Construction
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Lifting Cone Roof
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Center Column Support
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Supported Roof, Partially Completed
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Aluminum Dome, Lifting on to EFR Tank
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Frangible Roof Joints
• Roof to shell junction designed to fail first
in an emergency.
• Future piping and maintenance must not
interfere with the functioning of the
frangible roof joint.
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Fixed Roof – 24” Mushroom Circulation Vent,
Sample Vent and Skid-Proof Surface Coating
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Floating Roofs, Objectives
• Reduces air emissions
• Prevents product loss
• Meets regulatory requirements
• Improves fire safety
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Floating Roofs
• Material of Construction: Steel or Aluminum
• Roof Types
– Floating pan
– Bulkhead
– Internal pontoon
– Double deck
– Honeycomb or Foam Core
– Cable suspended Aluminum
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IFR Pontoon Construction
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Floating Roof Support Leg and Sleeve
(High Leg Position)
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Reinforcing Pad for Roof Leg
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Floating Roof Seals
• Primary Seals
– Liquid mounted foam logs
– Liquid mounted shoe seals
– Vapor mounted foam logs
– Vapor Mounted wipers
• Secondary Seals
– Elastomeric wipers
– Metallic wipers
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Mechanical Primary Shoe Seal in IFR
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Compression Plate Secondary Seal
with Wiper Tip on EFR Tank
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Other Tank Appurtenances
• Spiral stairway
• Ladders
• Level gauges
• Pressure vacuum vents
• Shell and roof manways
• Inlet diffusers
• Drain sumps
• Roof drain hoses
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Spiral Stairway Leading up the
Tank Exterior
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Internal Ladders with 8-inch Slotted
Gauge Pole
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Level Gauging Systems
• Mechanical level gauging systems are frequently used. There are multiple alarm levels.
• Radar gauges can be mounted at the fixed roof or in a gauge well.
• The gauging system often ties into the overall facility SCADA system.
• A redundant alarm is recommended by API.
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Level Gauging System
Mounted on Tank Exterior
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Sample Hatch
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Top View of IFR
Two 12” Pressure Vacuum Vents and Center
Column
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Drip Tray for Center Column with
Hold Down Chains
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Ladder Well Drip Tray
and Chained Slide Plate
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Tank Bottom Sump
Newly Painted
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Ladder, Slotted Gauge Pole, and Sump
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Slotted Inlet Diffuser
Slotted pipe
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Inlet Diffuser -- Hole Type
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Suction Line Trough
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Water Draw Piping
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Coiled Roof Drain Hose
Beneath Internal Floating Roof
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Reinstalling a Door Sheet
at the Conclusion of the Project
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Fire Systems
• Refer to NFPA 11 – Standard for Low-,
Medium-, and High-Expansion Foam.
• The Standard contains design criteria for
hydrocarbon storage tanks.
• The criteria include:
– Application rate
– Discharge time
– Minimum number of outlets
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Fire Systems (Con’t)
• Fixed roof tanks may be designed with
subsurface injections.
• Floating roof tanks will be designed with
over-the-top injection.
• Foam dams are used to focus on fighting
seal area fires.
• Other fire systems are designed for “Full
Surface Fires.”
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Foam Fire Systems
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Foam Chamber Installed in Tank
Shell
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Tank Cathodic Protection
• Galvanic Corrosion
– Can occur on the underside of a tank bottom causing oxidation, general corrosion, and pitting.
– Galvanic cell requires: • Anode – active metal at the tank bottom.
• Cathode – less active metal in the vicinity of the tank.
• Electrical path – tank bottom and soil.
• Electrolyte.
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Tank Cathodic Protection (Con’t)
• Impressed Current Systems
– Includes a DC current source created by a rectifier and a buried impressed current anode.
– Creates a current to counteract the galvanic cell and forces current to the tank bottom to prevent oxidation (loss of electrons).
• Sacrificial Anode
– The anode losses electrons rather than the tank.
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Impressed Current Corrosion
Protection
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API Recommended Practices
API 653
• API 653 – Tank Inspection, Repair,
Alteration and Reconstruction.
• Tanks are inspected to determine their
suitability for service.
• The standard includes recommendations
for tank inspection interval.
• This standard governs out of service
inspection and repair work.
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API 653 Tank Inspection, Repair, Alteration and
Reconstruction
• Scope
• Reference
• Definitions
• Suitability for Service
• Brittle Fracture
• Inspection
• Materials
• Design Considerations
• Tank Repair and
Alterations
• Dismantling/Reconstr
uction
• Welding
• Examination Testing
• Marking
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Other API Methods Relevant to Tanks
• API 651 – Cathodic Protection for Storage
Tanks.
• API 652 – Linings for Storage Tanks.
Standard for Internal Coating.
• API 2000 – Venting for Atmospheric and
Low Pressure Tanks.
• API 2350 – Overfill Protection for Storage
Tanks.
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API Recommended Inspection
Schedule
• Routine In-Service Visual Inspection
– Frequency not to exceed one month.
– Can be performed by Owner/Operator personnel.
• External In-Service Inspection
– Visual inspection of the tank exterior .
– By Authorized Inspector (API 653 Certified).
– Frequency not to exceed 5 years, but may be more frequent based on corrosion calculation.
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API Recommended Inspection
Schedule
• Ultrasonic Inspection
– Ultrasonic measurement of tank shell.
– Inspections at 15 year intervals or possibly
more frequent based on shell corrosion
calculation.
– Initial inspection in 5 years to establish a
corrosion rate.
– Corrosion rate may be estimated from tanks
in similar service.
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API Recommended Inspection
Schedule (Con’t)
• Internal Inspection
– Inspections at 20 year intervals or possibly
more frequent based on tank bottom
corrosion calculation.
– Initial inspection in 10 years to establish a
corrosion rate.
– Corrosion rate may be estimated from tanks
in similar service.
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Tank Maintenance Projects
Typical Tasks
• Empty tank.
• Isolate.
• Clean and degas.
• Inspection blast of floor coating.
• API 653 inspection.
• Issue preliminary inspection report and develop list of maintenance/repair items.
• Perform tank maintenance and repair work.
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Tank Maintenance Projects
Typical Tasks (Con’t)
• Tank strapping
• Final blast
• Tank coating
• Final inspection
• Return tank to service
• Exterior painting or concrete/asphalt work (optional)
• Final construction documentation
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Safe Work Practices
• Safety is Everyone’s Job
• Learn to Recognize Safe Work Practices
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Safe Work Permitting Procedure
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Heavy Tools are Lifted by Rope
Tag Line not Hand Carried
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Confined Space Vapor Monitoring
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Radio Communication
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Leg Setting
• The tank contractor will set the IFR legs
from high position to low position to land
the roof.
• This requires a confined space entry from
the manway on the fixed roof.
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Use Body Harness and Tripod for
Confined Space Entry
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Tripods Must Have Leg Chains for Stability
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Pulley Must be Mounted and Secure
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Body Harness Must Be Properly Attached
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Lock Out / Tag Out
• Lock out, tag out procedures are followed for piping and electrical.
• Contractors verify that all valves have been closed and locked out.
• Ensure that the terminal piping has been totally isolated (review terminal piping drawings).
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Plan Lockout/Tagout
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Gauge the Tank to Check that it is
Empty
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Close, Lock, and Tag Valves to
Isolate
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Electrical Lockout/Tagout
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Tank Valve Lockout
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Document the Valve Positions
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Tank Isolation
• For all lines, a valve is removed and blinded to create an air gap.
• Metal drip pans and vacuum truck are required when isolating the tank.
• Bonding cables are required when removing valves.
• 150 lb. blind flanges and new gaskets are required.
• After blinding has been completed, the piping is visually inspected to ensure tightness.
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Inspecting Empty Vacuum Truck Prior to
Use
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Bonding Cables and Metal Drip Pan
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Valve removal including bonding cables,
respirators, gloves, fire extinguisher, metal
drip pans and vacuum truck hose.
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Isolated Tank Valve with Air Gap
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Isolated Buried Line with Barricades
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Tank Degassing
• Tank degassing is performed, when required,
based on product type and location in
accordance with EPA, State, or local air
regulations.
• Portable Thermal Oxidizers are most frequently
used to handle the combustion throughput. IC
engines or activated carbon systems can be
used.
• The units need to have the appropriate air
permit and operate in accordance with the
permits.
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Portable Thermal Oxidizer and Generator
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Degassing Unit Placed Outside of Tank
Berm
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IC Engine Degassing Unit
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Temperature and Flow Monitoring is
Typically Required by the Air Permit
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Once the Manway is Removed Plastic
Sheeting is Place over it Immediately
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The Vapor Hose Penetrates the Plastic
Sheeting
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Tank Cleaning
• Proper placement of equipment to separate vapors from ignition sources.
• Proper PPE (hard hats, rubber boots, gloves, suits, full body harness, etc.).
• Enter with supplied fresh air.
• Monitor vapors inside the manway away from inlet.
• OSHA allows tank entry below 10% LEL for fresh air work; however, the goal is to be significantly lower.
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Hose Extends from Vacuum Truck
to Tank Manway
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Vacuum Truck Exhaust Connected
to Carbon Canister
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Manway Setup – Plastic Sheet, Fire
Extinguisher, Confined Space Permits
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Intrinsically Safe Fan Mounted on
Opposite Manway from Entrance
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PPE for Tank Entry
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Interior Appurtenances Removed to
Drain Product
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Center Column Mouse Hole
Drained of Product
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Marine Chemist Certifies the Tank
as Gas Free
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The gas free
certificate is posted
over the manway.
It may have certain
restrictions to be
aware of.
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Confined Space Access is Secured when
the Contractor Leaves the Site
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Cribbing Blocks Installed to
Support Roof
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Anti-Rotational Roof Support
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API 653 Tank Inspection
Techniques
• Magnetic Flux Exclusion (MFE)
• Ultrasonic Testing (UT)
• Vacuum Box Testing
• Dye Penetrant Testing
• Bottom Settlement Survey
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Calibration of Magnetic Flux
Exclusion (MFE) Bottom Scanner
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Large MFE/UT Floor Scanner Scans within 2” of Lap Weld Seams
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Marking Corrosion Indications
Circles – Topside Corrosion
Square – Bottomside Corrosion
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Calibration of Smaller Hand
Scanner
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Smaller Scanner in Congested
Area
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Hand Scanner used at Corner
Weld
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Remaining Floor Thickness is Marked in
Area of Soil Side Corrosion
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Automated Ultrasonic Thickness Measurement
used to “Prove Up” locations marked during MFE
Scan
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Vacuum Box Testing of Corner Weld
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Vacuum Box Testing of Floor Plate Weld
Seam
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Fluorescent Dye Penetrant Applied
to Corner Weld
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Using Black Light to Find Defects
Detected with Fluorescent Dye
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Bottom Settlement Survey
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Ultrasonic Testing of Tank Shell
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Ultrasonic Testing of Shell
Reinforcement Pad and Nozzle
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Ultrasonic Testing of Internal
Floating Roof
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Tank Repairs
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Tank Repairs
• Floor Patches and Plate Replacements
• Shell Repairs
• IFR Repairs
• Nozzles
• Seal Replacement
• Tank Valve Repairs
• Calibration and Repair of Gauging System
• Follow-up Testing
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Testing of Vapors Beneath Tank Floor
Through Small Hole Drilled in the Floor
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Bottom Repair at Critical Zone
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Testing New Patch With Soapy Water
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Dye Penetrant Testing of Shell
Nozzle
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Roof Drain Hose Inspection
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Replacing Seal Apron Fabric
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Fluorescent Testing Beneath IFR
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Inspecting the Penetrant Test Above
the Roof to Search for Leaks
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Pressure Testing Pontoons
Following Repairs
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Tank Interior Coating
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SPCC Compliance
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Purpose of SPCC Rule
• Requirements help prevent oil discharges from reaching navigable waters or adjoining shorelines.
• Certain facilities are required to develop SPCC Plans that describe equipment, workforce, procedures, and training to prevent, control, and provide adequate countermeasures to a discharge of oil. – Must comply with the rule requirements.
– Must also implement the written Plan.
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What does the SPCC Rule Require?
• Requires facilities to develop and implement a site-specific SPCC Plan to address: – Containment and procedures to prevent oil discharge
(operating procedures, inspections & tank testing, training, etc.)
– Control measures to keep an oil discharge from entering navigable waters (containment, drainage valves
– Countermeasures to contain, clean up, and mitigate any oil discharge that affects navigable waters (spill response measures)
• Performance-based rule designed to implement the Congressional policy of “no oil discharges” to waters of the United States
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Aboveground Petroleum Storage
Tank Act (APSA)
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What is an Aboveground Petroleum
Storage Tank?
• 55 gallons or more.
• Located substantially above ground.
• Tanks are either UST or AST, but not
regulated as both.
• The volume for mixtures is based on the
total tank capacity not the volume of
petroleum in the mixture.
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APSA Exemptions
• Two broad exemptions:
– Exempt Tanks (HSC §25270.2(a)(1 – 6)) • Some exemption conditions (and compliance with
those conditions) should be verified
– Exempt Facilities (HSC §25270.4.5(b)) • Exempt only from APSA requirement to prepare
and implement an SPCC Plan
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Tanks Exempted Under APSA
• Boilers & pressure vessels
• Waste & used oil tanks – Located at DTSC permitted hazardous waste
TSD facilities (and listed on the permit), or specifically listed on a facility’s PBR Tiered Permit
• Crude oil production tanks
• Most oil-filled electrical equipment
• CUPA regulated USTs
• Transportation-related tank facility
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APSA (and SPCC Rule) Exempt Tanks
• ‘Transportation-related facilities’ are not regulated under federal SPCC rules or APSA
• Facilities are divided into three categories: – Transportation-related facilities (exclusively regulated
by DOT / DOI)
– Non-transportation-related facilities (not exclusively regulated by DOT / DOI)
– Complexes (regulated by both)
• Jurisdiction was established through a series of Executive Orders (EOs) and Memoranda of Understanding (MOUs)
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EOs and MOUs
• Executive Order 11548 delegated responsibilities for regulating oil discharges (later superseded by E.O. 11735 and 12777). – EPA: Non-transportation-related facilities
– DOT: Transportation-related facilities
• EPA-DOT MOU (1971) defines transportation- and non-transportation-related.
• DOT-DOI-EPA MOU (1994) establishes responsibilities for offshore facilities, including pipelines.
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Non-Transportation-Related Facilities (CUPA Jurisdiction under APSA)
• Oil refining and storage facilities
• Industrial, commercial, non-exempt agricultural, and public facilities that use and store oil
• Waste treatment facilities
• Loading areas and racks, transfer hoses, loading arms, and other equipment used to transfer oil in bulk to or from highway vehicles or railroad cars
• Highway vehicles, railroad cars, and pipelines used to transport oil within confines of non-transportation-related facility
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Transportation-Related Facilities (DOT Jurisdiction)
• Onshore and offshore terminal facilities, including transfer hoses, loading arms, and other equipment used to transfer oil in bulk to or from a vessel; including storage tanks and appurtenances for the reception of oily ballast water or tank washings from vessels
• Transfer hoses, loading arms, and other equipment appurtenant to a non-transportation-related facility used to transfer oil in bulk to or from a vessel
• Interstate and intrastate onshore and offshore pipeline systems
• Highway vehicles and railroad cars that are used for the transport of oil
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Complexes (CUPA and DOT Jurisdiction)
• A facility with both transportation-related
and non-transportation-related activities is
a “complex facility” and is subject to the
dual jurisdiction of the CUPA under APSA
and DOT.
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Underground Piping Associated
with Aboveground Tanks
• APSA does regulate buried piping.
• The federal SPCC regulations contain
requirements for buried piping at a
regulated facility and APSA requires the
implementation of the SPCC Plan for
ASTs.
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APSA Regulated Piping
• Must be connected to the tank.
• APSA applies to:
– Piping in the containment area.
– Piping up to the first valve or flange outside the
containment area.
– If there is no containment, piping connected to the
first flange or valve.
• Federal SPCC rules for the facility may be
broader and include piping not integrally related
to the storage tank.
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APSA (SPCC) Compliance Verification
• Written Plan review – All rule-required content (and format)
– Facility-specific descriptions, procedures, etc. • Can be narrative, generic
• Inspect for compliance with the detailed rule requirements – Whether adequately described in the Plan or not
• Verifying the written Plan is consistent with field conditions
• Verifying that the facility is implementing the Plan as written
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DOT Compliance
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Applicable DOT Regulations
• Applicable to breakout tanks and pressure
relief tanks at petroleum transportation
facilities.
• DOT views the tanks as part of the
pipeline.
• CFR Title 49 – Transportation.
– Part 195 – Transportation of Hazardous
Liquids by Pipeline.
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Applicable Sections of DOT
Regulations for Tanks
• 195.132 -- Design and Construction of
Above Ground Breakout Tanks.
• 195.307 -- Pressure Testing Above
Ground Breakout Tanks (hydrostatic
testing).
• 195.432 -- Inspection of In-Service
Breakout Tanks.
• Subpart G -- Operator Qualification (OQ)
Training Program.
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DOT Applicable Regulations
Part 195.432 “Each operator must inspect the
physical integrity of in-service atmospheric and
low-pressure steel aboveground breakout tanks
according to API Standard 653 (incorporated by
reference, see §195.3). However, if structural
conditions prevent access to the tank bottom,
the bottom integrity may be assessed according
to a plan included in the operations and
maintenance manual under §195.402(c)(3).”
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Air Regulations
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Air Compliance
• Air Compliance rules are confusing, complex, and sometimes conflicting.
• This presentation will just provide a broad outline of rules.
• Rule applicability determination depends on:
– the year the tank was built,
– tank volume,
– vapor pressure of liquid.
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Clean Air Act (CAA) Regulations
• Ozone Precursors (VOCs) – Title 1, the
source is the individual tank.
– NSPS Rule, 40CFR Part 60
• Subpart K – Effective 6/11/73
• Subpart Ka – Effective 5/18/78
• Subpart Kb – Effective 7/23/84
– Control Technology Guidelines (CTG),
Reasonably Available Control Technology
(RACT) rules
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Clean Air Act Regulations (Con’t)
– Control Technology Guidelines (CTG),
Reasonably Available Control Technology
(RACT) rules.
• Applies to existing source in non-attainment areas.
• 1977 Fixed Roof Tank.
• 1978 EFR Tank.
• 1994 ACT for VOL Storage.
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Clean Air Act Regulations (Con’t)
• Air Toxics – Hazardous Air Pollutants
(HAPs Rule), Title III
– NESHAPS (40 CFR Part 61).
• These rules are specific to individual chemical in
individual tanks.
• Subpart Y is for Benzene.
– NESHAPS (40 CFR 63)
• Rule applies to all HAPs and the source is the
entire facility.
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Clean Air Act Regulations (Con’t)
– NESHAPS (40 CFR 63) – Continued
• SOCMI HON
• Gasoline Distribution
• Petroleum Refineries
• Oil and Gas Production (a.k.a. – E&P MACT)
• Organic Liquids Distribution (a.k.a. – Old MACT)