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Trends with Shop-Fabricated Storage Tanks

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Presentation on theme: "Trends with Shop-Fabricated Storage Tanks"— Presentation transcript:

1 Trends with Shop-Fabricated Storage Tanks
Wayne Geyer Steel Tank Institute November 18, 2013

2 Who and What is STI/SPFA?
Association of 180 fabricating and affiliate companies of steel construction products – shop-fab tanks, field erect tanks, pipe, pressure vessels and other special fabricated products STI members account for nearly all of the total shop fabricated underground steel storage tank production capacity in North America

3 2012 Annual Product Awards: Steel Fabricated Products
Driving traffic to our website, promoting steel and sustainability. Please take a look! Any questions? Thank you for this opportunity to share our efforts with you.

4 Steel Fact Sheets

5 What does the Steel Tank Institute do?
UST and AST tank technologies Industry standards and recommended practices License manufacturers to build tanks to STI specifications Quality control Information resource Certification 4 – 50,000 Gallon Permatanks Installed at Northwestern Univeristy

6 STI Tank Registration Every tank built with an STI labeled is inspected by tank fabricator to meet STI specification Tank is “registered” with STI STI maintains database with over 400,000 entries

7 Tank Performance Evaluation
All STI labeled UST’s subject to 3rd party warranty STICO Mutual has strong claims management program STI gets feedback on quality and performance

8 Education, Research, & Advocacy

9 STI Certification Programs
927 Certified SP001 Aboveground Storage Tank Inspectors 484 Certified Cathodic Protection Testers Over 130,000 sti-P3 tanks tested for cathodic protection through WatchDog program NEW: On Line Learning Program T*I*M Tank Integrity Management

10 STI Shop-Fabricated Tank Programs
> 100 tank shops licensed and inspected 14 tank fabrication standards 19 recommended practices for testing, installation and inspection NEW: R111 Storage Tank Maintenance Under Development: SP131- UST Inspection, Repair, & Modification

11 Years in Number after 1970

12 Coatings Provide Corrosion Protection

13 Underground Storage Tanks
Primarily used at service stations today Tanks are getting larger STI Database Average capacity in 2013 for jacketed tank exceeds 15,000 gallons 25 years ago, the typical UST at a service station was 8000 – 10,000 gallons

14 Compartment Tanks Compartment tanks have become very common for both UST’s and AST’s Multiple fuel types can be stored within one tank unit Provides user/owner versatility as more fuels develop

15 Underground Storage Tanks
UL 58 is the principle standard for steel tank construction – single wall and double wall steel UL 1746 is the principle standard for corrosion control and for jacketed (non-metallic outer wall) tank construction

16 Underground Storage Tanks
Regulations require all tanks incorporate secondary containment Today, jacketed tanks are favored by many buyers as outer containment provides a corrosion barrier and secondary containment Other corrosion systems use two walls of steel

17 Fabricating Steel Secondary Containment
After the primary tank is built and tested, the outer wall is fabricated atop the primary tank. The second wall is intimately wrapped atop the primary tank wall.

18 Testing the Interstice
Most fabricators will test the interstice by bleeding air from a 3-5 psi pressurized inner tank into the secondary tank. The volume of the interstice is very small and can get pressurized rapidly. Access to the interstice can be fabricated in different ways

19 Production Test to Verify Both Walls are Tight
Upon completion of production testing of the interstice with positive air pressure, and soap testing the welds of the secondary containment, all air is released. Then a vacuum is pulled within the interstice and monitored by the fabricator for tightness over time.

20 Preparing the Tank for Delivery
After ancillary equipment installed, coatings applied, etc. the tank is made ready for shipment. Fabricators apply a vacuum into the interstice of secondary containment tanks.

21 Interstitial Vacuum After the vacuum is applied, the tank is held in storage until it is made ready for delivery The vacuum remains on the tank during storage, delivery, and during much of the installation. An easy view of the vacuum gauge to verify retention of the vacuum assures that both walls remain tight.

22 Tank Compatibility - Biofuels
E10, E15, E85, B2, B20, B100 Steel Tank Manufacturer Certification Statements STI Web Site Performance Tanks are Cleaner – Sludge Biodiesel Shelf Life Water Concerns Phase Separation - Ethanol

23 Recent Events Biofuels
Sumps EPA ORD Research NIST Research Publications “Compatibility of UST Systems with Biofuels,” Published by ASTSWMO Case Studies Research and Work Groups Underground tanks storing E85

24 Ultra Low Sulfur Diesel Issues
Corrosion of metal components within FRP tanks storing ULSD Clean Diesel Fuel Alliance supported research from Battelle Labs - completed in 2012 Further studies under consideration STI Research Tanknology hired to visually examine the insides of steel and FRP ULSD tanks Fuel samples extracted and tested Example – Las Vegas service station tanks under same owner FRP tank vapor control fitting – top right photo Steel tank vapor control fitting – bottom right photo

25 Inspection and Maintenance of the Tank System

26 Inspection and Maintenance
STI R111 Storage Tank Maintenance STI SP001 AST Inspection

27 Aboveground Storage Tanks
Cylindrical Rectangular Vertical Horizontal Double Wall Diked Fire-protected Gen-Base FieldErected

28 Aboveground Storage Tanks
Most popular choice for shop-fabricated tanks for: Fleet motor vehicle fueling applications Fuel for emergency power generators Bulk oil and chemical storage Secondary containment

29 Aboveground Storage Tanks
UL 142 is the principle standard for steel tank construction – single wall and double wall steel. UL 2085 is the principle standard for two hour fire protected tank construction.

30 Aboveground Storage Tanks
Secondary contained shop-fabricated steel tanks are preferred: Serves as spill control to meet fire codes Meets SPCC rules with proper use of overfill prevention equipment Double wall construction preferred over diking

31 AST’s with 2-Hr Fire Test Ratings

32 Protected AST’s Protected aboveground tanks preferred when:
Installed in close proximity to buildings & property lines Dispenser mounted on tank Minimize fire safety hazards Meet codes for motor vehicle fuel dispensing

33 SPCC – AST Inspections EPA references STI SP001 standard for smaller tank inspection and integrity verification Category 1 preferred Double wall tanks can be easily tested with vacuum to prove containment integrity Category 3 – Higher Risk to Environment

34 Facilities with a mix of tanks require one type of inspector

35 Release Prevention Barrier (RPB)
Liquid containment barrier Under the AST Diverts leaks toward the perimeter of the AST where they can be easily detected

36 Risk Matrix Concept – SP001
More Risk Tank Size Category 1 Category 2 Category 3 Shop built tanks P P, E&L(10) ,000 [P, E&L(5), I(10)] or [P, E(5) & L(2)] 5, ,000 P, E(20) [P, E(10)& I(20)] [P, E(5) & L(10)] [P, E(5) & L(1)] 30, ,000 P, E&L(5), I(15) P, E&L(5), I(10) Field erected P, E(5), I(10) Portable containers P ** More Risk

37 Category 1 – Secondary Containment and CRDM
Double-wall Tank Tank in a with Overfill Prevention Concrete Dike

38 Wayne Geyer

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