Inspection of ASTs

7/29/2019 Inspection of ASTs

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Inspection of Shop FabricatedASTs per the SPCC Rule

Inspection of Shop FabricatedInspection of Shop Fabricated

ASTs per the SPCC RuleASTs per the SPCC Rule

Wayne B. Geyer, P.E.

Steel Tank InstituteA Division of STI/SPFA

Wayne B. Geyer, P.E.Wayne B. Geyer, P.E.

Steel Tank InstituteSteel Tank InstituteA Division of STI/SPFAA Division of STI/SPFA


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Few states have any certifications for ASTinstallers and it shows in the creativeways the tank systems are installed.

- J ohn Cignatta, course instructor forSTI AST inspector certification


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Doorways in dikes No overfill alarms

..

adequatecontainment

Leaking tank

Major Facility

Review of 28 tanks at a

Nearly 90% lackedadequate venting

Over 50% lacked


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Review of 28 tanks at aMajor Facility

0 20 40 60 80 100

Serious Other

Emergency Vent

Overfill

UL Listing

Containment

Normal Vent

Spill Control

% of tanks

Missing i

tem


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API 653 or STISP001

Requires Integrity

Revised SPCC Rules

References industrystandards

Tank inspection per

Testing

Visual inspectionalone no longersufficient


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Test Each AbovegroundContainer for Integrity

Section 112.8(c)(6) On a regular schedule

Combine visual inspection withanother testing technique Hydrostatic testing Radiographic testing

Ultrasonic testing Other nondestructive shell testing

Frequently inspect the outside of

Acoustic emissions testing

container


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Show me some tanks!!!


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AST Standardsfor Shop Fabricated Tanks

API - American Petroleum Institute

UL - Underwriters Laboratories

SwRI - Southwest Research Institute


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API Specifications

API 12F Specification for Shop Welded Tanks for

Storage of Production Liquids

Vertical, cylindrical only API 650, Appendix J

Shop Assembled Welded Steel Tanks

for Oil Storage

Vertical, cylindrical only


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API Vertical Tanks


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API Vertical-UL Horizontal Tanks


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Underwriters Laboratories

UL 142 SteelAboveground Tanks forFlammable and

Combustible Liquids UL 2085 Protected

Aboveground Tanks for

Flammable andCombustible Liquids


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UL 142 Steel thickness


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UL 142 type tanks


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UL 142 type tanks


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STI SP001-03

Standard for Inspection ofInService Shop

Fabricated AbovegroundTanks for Storage of

Combustible andFlammable Liquids


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How STI SP001 differs fromAPI 653

API 653 emphasis is the large, fieldconstructed tanks per API 650.

Strictly vertical tanks.

The bottom of the tank is not visible.

API 653 requirements are needed

because Large volume

Large pressure


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API 650 includes equations forcalculating the steel thickness neededfor a particular tank.

API 653 allows for / requires more

judgement by inspector


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Shop fabricated tanks Tables that specify the steel thickness

Manufactured in controlled shopenvironments


based on tank diameter and capacity.

Smaller capacities and smaller hydrostaticpressures

Capacity up to 50,000 gallons.


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50,000 gallon tank


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Corrosion concerns

Check corroded

areas to findminimum thickness


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Single wall tanks restingdirectly on the ground are a

concern!!


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Periodic Inspection by tank owner

>Water inside tank

> Vents> Pipe connections> Exterior paint> Foundation

www.steeltank.com/library/pubs/waterinfueltanks.htm


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Certified Inspection

Performed by Qualified Tank Inspector STI Trained and Certified

API Certified

Every 10 Years

All types of tanks (single and double

wall, on ground and elevated)


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September 20 - 24 Tennessee

J une 14 - 18 California

J uly 19 - 23

STI AST Inspector Training

Michigan May 24 - 28

New York

NEW for 2004 Level 1

Tank inspector

Level 2 Tank system

inspector


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Level 2 Tank System


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Tank type dictates inspection method:Single wall not in contact with

ground

Single wall in contact withground

Double wall or double-bottom

STI Certified Inspection


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Double wall or double-bottom

Check leak

detection system

Check for water orfuel in interstice


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STI Certified Inspection UT Testing by

scanning if possible Most reliable method

for determining wallthickness

Qualified UT inspectornecessary (ASNTSpecifications)


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Must compare remaining wallthickness to original thickness

6. Certified Inspection Criteria


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STI SP031-04

Standard for Repair ofInService ShopFabricated

Aboveground Tanksfor Storage of

Combustible andFlammable Liquids


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Patches New bottoms

SupervisingPersonnel

STI inspectors

SP031 Repair Standard

Adding openings

Supportmodifications

API inspectors

Repair Personnel

Tank manufacturer Testing of repairs

ASME welders

AWS welders


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Tank owner surprises

Not all that meets the eye!


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Tank #1


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Tank #1

No grounding anywhere

Unsecured AST's in a flood plain (Not a single anchorbolt)

Many Electric Code Violations

Improperly Secured Conduits

OSHA Access Issue on the back stairs and topplatform

PVC Caps atop various nozzles (No Fire Rating forPVC)

Labeling Issues


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Tank #2


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Tank #2

Fuel Piping

Unsupported Pipes

Leaking SubmersibleTurbine Pump

No CP on buried fuelpipe runs

Electric Code Violations

Kinked Flex Connector

Improperly Installed

Combustible Materialsstored inside dike

Poor Control on Tank

Pipes and conduits too

close in pipe trench Unsupported Conduits

Missing Fire Diamonds

Filling Routine Spillage

Conduits between fuelpipes in pipe trench


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Tank #3


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Tank #3

Unsupported conduits

Valve on Return Piping

tank's annular space

No Vehicle Damage

PVC Caps on various tanknozzles

Flex Fuel lines secured toUnistrut with conduitclamps

Normal vent on secondary

No fire diamonds

Improper labeling ofnozzles

bottom)

Veeder-Root bottomwater floats can get hungup on shafts if rustymuck/mud forms in

Tank not being stickedto check either ATGSaccuracy oraccumulation of water

Protection (i.e., bollards)


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Get the BIG picture first


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Enough openings ontop?

underground? Tank next to river, is

it anchored?

Supports more than12 in. high?

Condition offoundation?

From 20 feet away.

Dirt spots on tank,fuel spilled?

Coated for Adequate

containment? Paint condition?

Level gauge visible?


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Adequate supports?

condition? Weep holes? Use

UV light here

Closer inspection

Emergency ventcondition?

Normal vent

Look inside tank, butwith proper trainingonly.


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New STI StandardsCommittee

To review inspection standards

SP001

SP031


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Does this Comply?


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I ti f T k


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Inspection of TanksKeeps Things Happy

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Inspection of ASTs

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