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Areas of ExpertiseAPI Storage Vessels

API Code

At Innovex Engineering we have extensive experience in design and engineering of storage tanks per American Petroleum (API) standards. We work primarily with API 12F, 620 and 650.

API 12F covers material, design, fabrication and testing requirements for shop-fabricated vertical, cylindrical above ground, closed top welded steel storage tanks in various standard sizes and capacities for internal pressures approximately atmospheric. The internal pressures are not to exceed 0.5 or 1 PSIG depending on the tank size.

API 620 covers the design and construction of large, welded, low-pressure carbon steel above ground storage tanks (including flat-bottom tanks) that have a single vertical axis of revolution. This standard does not cover design procedures for tanks that have walls shaped in such a way that the walls cannot be generated in their entirety by the rotation of a suitable contour around a single vertical axis of revolution. Tanks described in this standard are designed for metal temperatures not greater than 250 degrees Fahrenheit where pressures in their gas or vapour space is not more than 15 PSIG.

API 650 establishes minimum requirements for material, design, fabrication, erection, and testing for vertical, cylindrical, aboveground, closed- and open-top, welded storage tanks in various sizes and capacities for internal pressures approximating atmospheric pressure (internal pressures not exceeding the weight of the roof plates), but a higher internal pressure is permitted when additional requirements are met (see 1.1.12). This Standard applies only to tanks whose entire bottom is uniformly supported and to tanks in non-refrigerated service that have a maximum design temperature of 93°C (200°F) or less. The maximum permitted internal pressure is 2.5 PSIG

Client Driven Design Criteria

In addition to ensuring that our designs meet the applicable design we focus on ensuring that our designs and engineered drawings are created with the needs of both the end user and manufacturer in mind. We strive to ensure that our designs and drawings are easily interpreted on the shop floor and by all parties involved in the project in order to minimize costs and reduce revisions and re-work during production.

The primary way in which we are able to reduce revisions, re-work and errors during the design process as well as manufacturing is by using exclusively 3D CAD software. Using 3D CAD we are able to completely lay out our designs in a 3D model which allows us to ensure an effective design, check for interferences, quickly make design changes, and much more. We are also able to send 3D models to our clients and manufacturing partners to simplify the review and manufacturing processes. This allows for an initial design review to be completed before engineered drawings are started, minimizing the cost to our clients. Having a 3D model we are able to show any level of detail on the engineered drawing that suits the client and/or manufacturer.

Additional Analysis as Required

The 3D CAD models that we create can be directly imported into our finite element analysis (FEA) simulation software. In some cases deviations from the standards are permitted if they are shown to be safe with an FEA.

Custom Design

There are typically custom elements to any storage tank design project, especially when it comes to large tanks. For example a client required a spiral stair case and platform structure for a tank farm that consisted of multiple 3000 US barrel storage tanks. In this case there were numerous aspects of API 650, the provincial OH&S and national building code standards that had to be met.

We have extensive experience working with manufacturers that specialize in producing API and ASME storage tanks. We have had the opportunity to work with them to drastically reduce their manufacturing time and cost as a direct result of tooling and production equipment that we have designed, improved upon and helped implement. Our process improvement designs are always developed in collaboration with the client and often result in creative solutions that significantly improve production costs.

Using our extensive experience and the tools at our disposal we are able to create designs and engineered drawings that successfully comply with all applicable standards, are innovative and cost effective.

Process & Deliverable(s)

We tailor our design, approval and detailing process to ensure a successful, cost effective and timely project. The typical milestones in our projects include:

1. An approval package that contains all design details, such as:
2. An approval package issued for final approval, that typically includes:
3. Once all of the drawings are approved, we supply a construction package which includes: