The API Spec Q1 Monogram – The Mark of Quality

The API Spec Q1 Monogram – The Mark of Quality


Bolted Storage Tank for Oil API

Superior Tank Company., Inc (STCI) is one of the only manufacturers of bolted steel oil storage tanks which can feature the prestigious API SPEC 12B monogram. In order for the bolted steel tank to include the API 12B monogram, the tank must strictly adhere to the API SPEC 12B standards. In addition, the tank manufacturer must be certified to meet the stringent API SPEC Q1/ISO 9001:2008 quality standards.

Our bolted steel tanks for oil storage are engineered to meet the strict API SPEC 12B design standard and include numerous elements to increase tank durability and longevity. To seal our tanks, STCI utilizes Buna-N or Viton gaskets in place of mastic putty which cannot be used for oil storage. The Buna-N and Viton gaskets are extremely durable and resistant to crude oil and other petrochemicals. In addition, the gaskets have a high tensile strength to prevent tearing and they remain flexible over time, thus eliminating leaks. For increased durability, we apply factory powder coating specifically formulated for oil storage. For continuous immersion service, epoxy factory powder coating or premium Scotchkote powder coating is applied to tank interiors. TGIC polyester powder coating is used on the exterior of our bolted steel tanks for greater UV resistance. API approved appurtenances such as specialized roof vents, gas outlets, liquid outlets and manways are used on all steel tanks for oil storage. Superior Tank Co., Inc. can also fabricate custom internal and external piping to meet customer requirements.

Our API SPEC 12B bolted steel tanks range in size from 100 to 10,000 bbls and conform to dimensions determined by the API SPEC 12B specification.  In addition to crude oil storage tanks, we can also manufacture other oil related steel tanks such as wash tanks, gun barrel separators, skim tanks and produced water storage tanks. For extremely corrosive applications such as produced/brine water treatment facilities, our steel tanks can be protected with Scotchkote powder coating and encapsulated hardware.  Our steel tanks are also used with oil field water treatment facilities and incorporate with specialty appurenatances as well as exterior insulation and internal heaters.

In addition to our bolted steel tanks complying with API SPEC 12B design standard, STCI has been certified to comply with API SPEC Q1/ISO 9001:2008 quality standards. Compliance with API SPEC Q1/ISO 9001:2008 signifies the company has adopted Quality Management Systems and ensures we will meet customer expectations, delivery time requirements and that our products go through a rigorous final inspection.


When buying your next bolted steel tank for oil storage, remember to look for the API 12B monogram as a guarantee of quality! 

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