Roof Types Selection

Configuration

Supported Design Standards

Summary

Preview

Column-Structurally Supported Cone Roof NO IFR

Column / Structurally Supported Cone Roof

Column Structurally Supported Cone Roof Tank

A common fixed-roof design for tanks with relatively low pressure.  They contain a shallow cone roof utilizing a center column of pipe or structural steel. Intermediate columns are commonly used on larger diameter tanks.  Internal framing is used to support the roof plates;  this may include supporting rafters, clips, tie bars and girders.

Column Structurally Supported Cone Roof Tank

Highlights

  • Permits for a large diameter roof design
  • Rigid structure can be designed for large snow loads

Summary

Preview

Column Structurally-Supported Cone Roof 650 NO-IFR

Column / Structurally Supported Cone Roof

Column Structurally Supported Cone Roof Tank

A common fixed-roof design for tanks with relatively low pressure.  They contain a shallow cone roof utilizing a center column of pipe or structural steel. Intermediate columns are commonly used on larger diameter tanks.  Internal framing is used to support the roof plates;  this may include supporting rafters, clips, tie bars and girders.

Column Structurally Supported Cone Roof Tank

Highlights

  • Permits for a large diameter roof design
  • Rigid structure can be designed for large snow loads
  • With an API 650 design, the tank can be re-purposed to store many additional liquids

Configuration

Supported Design Standards

Externally Stiffened

Summary

Preview

Self-Supporting-Cone Roof-AWWA-D-100-NO-IFR

Self-Supporting Cone

Suitable for small diameter tanks. Roof is supported at the shell.

Self Supporting Cone Roof Tanks

Highlights

  • Roof can be sealed

Self Supporting Stainless Cone Roof

Summary

Preview

Self-Supporting Cone Roof NO IFR Externally Stiffened

Self-Supporting Cone (Externally Stiffened)

Suitable for medium size diameter tanks.  The external stiffening can allow additional support for platforms and structures on the roof.

Self Supporting Stiffened Cone Roof Tank

Highlights

  • Suitable for tanks with internal roof coating
  • External Stiffening allows for a medium sized roof diameter
  • Roof can be sealed

Self Supporting Stiffened Cone Roof Tank

Externally Stiffened

Summary

Preview

Self-Supporting Cone Roof 650 NO IFR

Self-Supporting Cone

Suitable for small diameter tanks. Roof is supported at the shell.

Self Supporting Cone Roof Tank

Highlights

  • Roof can be sealed
  • With an API 650 design, the tank can be re-purposed to store many additional liquids

Summary

Preview

Self-Supporting Cone Roof 650 NO IFR Externally Stiffened

Self-Supporting Cone (Externally Stiffened)

Suitable for medium size diameter tanks.  The external stiffening can allow additional support for platforms and structures on the roof.

Self Supporting Stiffened Cone Roof Tank

Self Supporting Stiffened Cone Roof Tank

Highlights

  • Suitable for tanks with internal roof coating
  • External Stiffening allows for a medium sized roof diameter
  • Roof can be sealed
  • With an API 650 design, the tank can be re-purposed to store many additional liquids

Self Supporting Stiffened Cone Roof Tank

Configuration

Supported Design Standards

Externally Stiffened

Summary

Preview

Self-Supporting Umbrella No IFR

Self-Supporting Umbrella

The umbrella roof consists of a modified dome, where the horizontal section is a regular polygon with multiple sides with roof plates, supported only at the periphery.  Dome roofs are also possible at a higher cost.

Highlights

  • Can often be built from thinner material than a cone
  • The bulk of the roof work can take place at grade

Summary

Preview

Self-Supporting Umbrella No IFR Externally Stiffened

Self-Supporting Umbrella (Externally Stiffened)

The umbrella roof consists of a modified dome, where the horizontal section is a regular polygon with multiple sides with roof plates, supported only at the periphery. The roof is stiffened with structural beams, welded to the exterior of the umbrella sections as per design.  Dome roofs are also possible at a higher cost.

Self Supporting Stiffened Umbrella Roof 4

Highlights

  • Can often be built from thinner material than a cone
  • The bulk of the roof work can take place at grade
  • External stiffening allows for a medium sized tank diameter

Externally Stiffened

Summary

Preview

Self-Supporting Umbrella Roof No IFR

Self-Supporting Umbrella

The umbrella roof consists of a modified dome, where the horizontal section is a regular polygon with multiple sides with roof plates, supported only at the periphery.  Dome roofs are also possible at a higher cost.

Self Supporting Umbrella Roof Tank

Highlights

  • Can often be built from thinner material than a cone
  • The bulk of the roof work can take place at grade
  • With an API 650 design, the tank can be re-purposed to store many additional liquids

Summary

Preview

Self-Supporting Umbrella Roof No IFR Externally Stiffened

Self-Supporting Umbrella (Externally Stiffened)

The umbrella roof consists of a modified dome, where the horizontal section is a regular polygon with multiple sides with roof plates, supported only at the periphery. The roof is stiffened with structural beams, welded to the exterior of the umbrella sections as per design.  Dome roofs are also possible at a higher cost.

Self Supporting Stiffened Umbrella Roof Tank

Highlights

  • Can often be built from thinner material than a cone
  • The bulk of the roof work can take place at grade
  • External stiffening allows for a medium sized tank diameter
  • With an API 650 design, the tank can be re-purposed to store many additional liquids

Configuration

Supported Design Standards

Summary

Preview

Geodesic Dome Roof No IFR

Geodesic Dome

These clear-span, space frame structures are corrosion-resistant, easy to maintain, and customizable.

API 650 Tank Geodesic Dome Roof

Highlights

  • They are Light weight
  • Naturally corrosion resistant. No coatings required
  • Can be constructed either on tank or elsewhere on site

Geodesic Dome Assembly at Grade

Summary

Preview

Geodesic Dome Roof No IFR

Geodesic Dome

These clear-span, space frame structures are corrosion-resistant, easy to maintain, and customizable.

Geodesic Dome Roof Tank

Highlights

  • They are Light weight
  • Naturally corrosion resistant. No coatings required
  • Can be constructed either on tank or elsewhere on site

API 650 Tank Geodesic Dome Roof

Configuration

Supported Design Standards

Summary

Preview

Open Top

These tanks are commonly found in mining and waste water facilities where the open top design does not have a negative effect on the stored product.

Water Purification Tank

Highlights

  • Simple Design
  • Highly customizable
  • Ideal for external process equipment. i.e. an agitator

Clarifier Tank WLS Clarifying Tank

Summary

Preview

Open Top

These tanks are commonly found in mining and waste water facilities where the open top design does not have a negative effect on the stored product.

Highlights

  • Simple Design
  • Highly customizable

API 650 Tanks under Construction

External Options

  • Ideal for external process equipment. i.e. an agitator

 

API 650 Tank Open Top Agitator

Design Specifics

Adhering to the AWWA D-100 standard, our tanks are constructed with ASTM A36 carbon steel as the primary material, while other approved materials are used to construct external components.  Ensuring the safety, integrity and function of your finished tank is our highest priority. That’s why we support in-house, custom fabrication and hire certified welders with intimate knowledge of AWWA D-100 Section 10, which provides specific instructions for tank erection.  With over a century in tank design & field erection, we’ve continually developed and critiqued our design and construction process. Some design specifics considered include:

Considerations

  • Allowable external loads on tank shell openings
  • Environmental loads (wind, seismic, snow, importance factors)
  • Foundation design

Requirements

  • Maximum capacity

Materials of Construction

  • Carbon steel, stainless steel or duplex steel

Corrosion Protection

  • Linings, coatings
  • Cathodic protection

Access Systems

  • Radial or spiral stairways
  • Roof access systems

Heat Conservation

  • Various insulation products

Standards

TIW designs tanks to both AWWA D-100 and API standards, each having its benefits based on the storage application. We have the capability to design your AWWA D-100 welded steel tank in various sizes and capacities.  TIW tanks are large vertical and cylindrical structures requiring  field erection. Aboveground, flat bottom, ground supported, welded steel in various sizes and capacities for internal pressures not to exceed specific atmospheric temperatures.

  • AWWA D-100 Standard

    Requirement

    The American Water Works Association has set these guidelines for the construction of welded carbon steel tanks for water storage. The American National Standards Institute has adopted them as best practices within the industry for designing and building tanks to be used in water systems where the internal pressure does not to exceed atmospheric pressure.

  • API 650 Standard

    Requirement

    The American Petroleum Industry (API) has established the 650 standard, setting minimum requirements for the design, material, construction, and testing of aboveground, open and closed-top, cylindrical welded steel storage tanks of various capacities and sizes.
    They are designed as non-refrigerated tanks with a minimum material thickness of 3/16 inch of carbon steel, austenitic duplex stainless steel, and aluminium. Supporting an internal pressure of 2.½ PSI or less and an operating temperature of -40° F to 500° F. They are commonly used to store products such as crude oil, petroleum by-products, chemicals and process water.

    Repairs, Modifications & Testing

    The API 650 Standard provides details for the minimum testing to be performed to ensure quality workmanship of the tank along with a separate standard, API 653, dedicated to providing a complete set of procedures and tests, specifically for the repair of API 650 tanks.

    We are well-known for our expertise in performing repairs and modifications for a wide range of customers. Please see our API 653 Repair Services for more details.

     

    Goto API 650 Product Page: api-650-tanks-various-configurations

  • API 620 Standard

    Requirements

    The API 620 Standard governs the design and construction of large, welded, low-pressure storage tanks. These tanks require an elevated, flat or cone bottom, and a minimum material thickness of 3/16 of an inch in carbon steel, austenitic stainless steel and nickel alloys (low temperature only). These tanks operate as low as -325° F to 250° F with an operating pressure of up to 15 PSI. They are generally utilized for cryogenic liquefies such as LOX, LIN or LNG as well as other chemicals which require internal design pressures exceeding those allowed by 650 tanks.

Appurtenances

Our design engineers can customize a wide ranges of appurtenances on the interior and exterior of your water tank.  With our in-house, 200,000 sq ft material processing plant, we look after the fabrication of everything from nozzles, vents and piping to custom stairways, platforms and ladders.

Here are some typical components we design, fabricate and install on our AWWA D-100 tanks…

Internal Components

  • Internal Ladders with Fall Arrest Systems
  • Piping Subsystems for Multi-Level Sampling
    • Overflow
    • Pumping

External Attachments

  • Nozzles (with flanges, elbows, couplings and more)
  • Ladders and Safety Railings
  • Stairways: Spiral and Radial:
    • Single and Double Stringer Designs with Handrail Variations
  • Roof Walkways, Platforms, Joining Catwalks and 360 Degree Handrails
  • Shell Manways
  • One Roof Access and Two Shell Access Manways
  • Rectangular and Circular Hatches
  • Insulation Rings
  • Rescue Davits
  • Shell Vents
  • Piping Supports and Grounding Lugs

Managed Services

Protective Coatings & Insulation

TIW offers a wide variety of protective coatings for corrosion prevention including external coating and full internal lining.  We also offer alternate corrosion options such as hot dip galvanizing, coating over galvanized components.

Access Systems Coating Tank LaddersShop Pre-Coating

TIW can shop coat floor plates, shell plates and appurtenances prior to shipping to site.  This can help offset the high prices of field coating and help minimize open-air blasting which can be environmentally prohibited in some project locations.

Galvanized Tank StairwellGalvanizing

We provide galvanizing of various tank components – from nozzles, piping and support clips to handrails and platforms. In some cases, both galvanizing and coating are applied providing a superior protection.

Water Storage Tank with 360 Degree Handrails around a Self-Supporting Cone Roof

Exterior Coatings

These coatings are applied to the exterior of the tank for corrosion protection and cosmetic appearance. Exterior surfaces are typically sand blasted to an SSPC-SP6 finish in preparation for coatings such as:

  • High-performance epoxy primers and finish coatings
  • Inorganic zinc coatings
  • Holding primers
  • Acrylic polyurethane coatings
  • High-temperature coatings
AWWA D-100 Water Tank Self Supported Umbrella Roof Design

Interior Linings

When storing potable water, the interior surfaces of the tank are typically prepared with a minimum SSPC-SP10 near white metal blast and completely lined with an epoxy coating or appropriate NSF approved coating.  TIW removes all sharp edges prior to sandblasting, and can perform complete Holiday testing (to test for voids in the liner), prior to signing off on the lining. Some typical linings may include:

  • Epoxy primers
  • Epoxy finish coatings
  • Holding primers
  • Temperature rated coatings
Water Tank Insulation

Insulation

When temperature control is required per design, TIW can supply and install a variety of mechanical insulation to meet the customer’s requirements. Insulation options can vary from the more common insulation batts with external cladding to prefabricated insulated panels. There are also different insulation and cladding material options.

Depending on design and temperature requirements, TIW can offer several insulation materials such as:

  • Fiberglass
  • Calcium silicate
  • Mineral wool
  • Cellular glass
  • Perlite
  • Polyisocyanurate
  • Thin blanket
  • Aerogel