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Field Erected Tanks & On-Site Construction (API 650/620)

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On-Site Tank Construction: 35,000 to 750,000+ Gallons

SFI provides turnkey on-site construction and field erection for large-volume stainless steel and specialty alloy storage tanks. Our API 650 & API 620 certified field crews manage every phase of your project, from plate processing to final testing and turnover. We specialize in projects where tank size, location, or site logistics make shop fabrication and transport unfeasible.

API 650 & API 620 Certified for Critical Applications

We build, inspect, and certify our field erected tanks to the highest industry standards, ensuring compliance and long-term asset integrity. Our quality control program and dedicated safety management are designed to meet the rigorous demands of EPC firms, municipalities, and major industrial operators. As an ASME certified shop, all our welders are ASME certified to ensure the highest level of quality on your project.

Industries Served

Our field crews have proven experience delivering complex, large-scale storage solutions across a range of demanding industries:

  • Water & Wastewater: Large-volume potable water and process water tanks compliant with AWWA D100 standards.
  • Chemical & Petrochemical: Bulk storage tanks for raw materials and finished products, built from corrosion-resistant alloys.
  • Pulp & Paper: Field erection of large process vessels such as bleach towers and liquor tanks inside existing plant structures.
  • Power & Utilities: Raw water, demineralized water, and bulk chemical storage tanks for power generation facilities.
  • Food & Beverage: Large-scale sanitary silo and storage tank projects for bulk ingredients and liquids.

Field Modifications, Repair & R-Stamp Service

Beyond new construction, SFI is a National Board "R" Stamp certified organization, authorized to perform welded repairs and alterations to existing ASME pressure vessels and tanks in the field. Our experienced crews are deployed for planned shutdowns and emergency service to ensure the integrity and extend the life of your critical plant assets.

  • ASME & National Board certified R-Stamp repairs and alterations
  • Nozzle additions, manway replacements, and shell repairs
  • Addition or modification of heating coils, insulation, or agitation systems
  • Weld inspection, NDE testing, and complete documentation turnover
  • Ladder, platform, and safety system retrofits

Field Erection Process & Capabilities

Our project management and field execution are designed to minimize site disruption and ensure predictable project outcomes. We exclusively use SFI personnel—never subcontractors—who are trained and experienced in our proven field fabrication methods. By combining extensive shop preprocessing with meticulous on-site assembly, we deliver superior quality, safety, and adherence to your project schedule.

  • Expertise in High-Performance Alloy Tanks: Proven field experience fabricating and welding vessels from corrosion-resistant alloys including Duplex 2205, AL-6XN, Hastelloy, and Inconel.
  • Certified On-Site Tank Welding: Our ASME-certified welders are proficient in the automated and manual processes required for ensuring the full penetration and structural integrity of high-alloy tank and vessel welds.
  • Integrating Heating & Cooling Systems: Full capabilities for on-site installation and testing of half-pipe, dimple, and conventional jacket systems.
  • Installing Large-Scale Agitation: Expertise in rigging, mounting, and integrating top- and side-entry agitator systems for large-volume mixing applications.
  • Fabricating and Installing Access Structures: Turnkey fabrication and installation of OSHA-compliant ladders, platforms, cages, and handrails integrated with your tank system.

Request a Budgetary Estimate for Your Project

Our team is ready to review your project specifications. Whether you are in the early planning stages (FEL-1) or have a complete bid package, we can provide the detailed estimates and technical documentation you need. Contact us to discuss your field fabrication project.

Modifications and Repairs

SFI is ASME certified to not only build new equipment, but also make modifications and repairs. These services include:

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Materials of Construction

  • 300 Series Stainless Steel
  • Other nickel based alloys including:
    • Hastelloy
    • Monel
    • Inconel
    • Duplex 2205

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Material Finishes

  • 2B (cold rolled sheet)
  • Mill (HRAP)
  • Mechanical polish (from 50 to 10 Ra)
  • Mechanical polish plus Electropolish (from 30 to 10 Ra)

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Weld Finishes

  • As-Is
  • Scotch-Brite buffed
  • Mechanical grind (50 grit)
  • Mechanical polish (32 to 10 Ra)

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Heating & Cooling

  • Dimple jacket
  • Half pipe coil
  • Internal pipe coil
  • Open jacket

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Agitation

SFI can create a custom-designed mixing solution to meet your needs. 

We offer mixers or combinations of mixers for processing a wide variety of viscosities and applications for our stainless steel tanks. Mixer styles include turbine, sweep, scrape, and dual motion.

Click here to learn more about our Agitation capabilities

Supports

  • Legs
  • Lugs
  • Skirts
  • Saddles

 

Storage Tank Fabrication

When it comes to field erected stainless steel tanks, SFI has the knowledge and experience paired with highly skilled personnel, innovative equipment and a company-wide commitment to do our best for our customers. We are…

  • well qualified and committed to meeting the needs of our customers.
  • focused on providing a safe and efficient working environment.
  • proud of the work we do!
Our field supervisors average over 20 years on the job at SFI and many of them worked in the industry prior to joining us.

Watch our short animation depicting field erection of storage tanks below

SFI also offers on-site tank inspections, modifications and repairs.  We are ASME certified for new equipment and authorized by the National Board to modify and repair existing ASME pressure vessels.   Click here for more information.

Ladders, Platforms & Handrails

Many large field erected storage tanks require access to the top for maintenance.  These tanks are outfitted with ladder assemblies designed per OSHA standards including components such as cages that wrap around the ladders, rest platforms at the required intervals, and handrails around the top.

For more information about ladders, platforms and handrails built by SFI, click here.

Shop Preprocessing Combined With Field Assembly

Prior to shipping to the jobsite, materials to be field assembled are preprocessed in our shop so the head and shell materials are already sheared and rolled when they arrive on-site.  Once materials and equipment arrive, the crew can quickly begin field erection.

Our field crews are dedicated solely to on-site fabrication, making each member highly proficient in our field fabrication methods.  As in the shop, all welders are ASME certified. Our field supervisors average over 20 years on the job at SFI and many of them worked in the industry prior to joining us.

Field Fabrication vs Shop Fabrication

At about 35,000 gallons, tanks are getting too large to ship and need to be field fabricated.  This is simply a guideline and many of the tanks that are field fabricated by SFI crews are half that size or smaller – even capacities as low as 5,000 gallons have been built on-site at customer facilities.

Some situations that make field fabrication a better option include:

  • The tank will be located inside a building where doors are too small for a pre-fabricated tank.
  • The location for the tank is outside, but under a roof where cranes cannot be utilized.
  • Pipe racks or large pieces of equipment prevent moving a tank through the plant.
  • There is no room to maneuver because the area where the tank will be located is too small.
  • The tank will be in a basement where there is no access other than a freight elevator.
  • The ceilings are too low to bring the tank in and stand it up using a crane.
  • The tank needs to be built in place while a structure is being built around it.
  • Work schedules for the various trades involved necessitate field fabrication to keep the construction project on track.
  • Leadtime is short and field fabrication saves valuable time.

One of our strengths is finding ways to “make it happen”.  Our Regional Managers work with customers every day to find the best ways to do the job and our field supervisors and crews are skilled at getting it done.

Field Fabricated Tank Construction

Our on-site fabrication methods allow the crew to work outdoors or in areas where there is limited access, such as under a roof, near another structure, etc.  Because we use jacking devices, crews typically work at ground level eliminating the need for scaffolding and cranes.  Working in this way is not only safer due to greater stability, but also saves both time and money.

The automated welding and grinding equipment and processes developed by SFI for use in the field provide quality workmanship. This, combined with our experienced personnel and ground level worksite, means a higher quality tank, each and every time.

Field Inspections, Modifications and Repairs

Our field crews are well qualified to modify tanks on-site at customer facilities and we also provide on-site inspection services of existing tanks and vessels.  We will mobilize a supervisor to your facility to inspect a tank that has collapsed, look at cracks, pits, etc.  After inspection, we provide our recommendations and a quotation for repair or replacement.

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Certifications

SFI utilizes various standards to ensure your product is built to the highest quality possible. 

We hold the following certificates:

  • ASME “U” certification
  • National Board “R” certification

Other standards are utilized as required, such as:

  • API 620 & 650
  • ASME BPE Guidelines
  • Canadian Registration Number (CRN) documentation
  • Ministry of Manpower-Singapore (MOM) documentation
  • PED (European Pressure Equipment Directive) “CE” Mark
  • UL-142
  • USDA

Safety

Safety on a job site, whether it be yours or our own, is of critical importance to us and we invest significant resources in on-going training, safety management, and equipment.

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