“Please let your crew know that I appreciate their work and efforts to get this tank done. GOOD JOB!!”

Michael B.

Satisfied Customer

“Very good and timely response.”

Steve M.

A Historic Moment

“Today  water began flowing to our customers. A bit of clean-up, replace the Brown’s gate, and we will be finished. One bit of history I remember tells me that this is the first project of this magnitude since the Empire State Building to finish ahead of schedule and (slightly) below budget. Thank you for your support.”

Peter S.

Have Always Used Superior

Have always used Superior and don’t know any water supply company that doesn’t use Superior.

Mark C.

Customer For Over 30 Years

“We have done business with Superior Tank for over 30 years and plan on doing more business.”

Johnny G.

The quality of the build was excellent

“The tank you built for us in 2002, has absolutely no wear on the Powder Coating or any other feature of the tank. The quality of the build was excellent, we automatically go to Superior for our tank needs as it is a known quantity.”

Robert S.

Superior Customer Service

“Superior Tank took care of us in our time of need and had the best price around. Mr. Huel took very good care of us from start to finish as did the crew putting the tank up. Superior Tank was also recommended to us by a neighboring water company who was very pleased with their work as well.  Thank you Superior Tank .”

Quinn A.

Fantastic Bolted Steel Tank!

“Absolutely fantastic tank!  Your crew was a very impressive team; the tank went up much quicker than we had expected.”

Ed C.

Pleased With Quality & Service

“We were happy with the quality of the product as well as the follow up service. The crew was efficient and did a great job.”

William A.

Excellent Product & Service

“Excellent product and very good support service.”

Elson G.

Superior was one of my better decisions

I can tell you that I was extremely happy with the professionalism of the entire process from design to install. Superior was one of my better decisions while running Saltwater Disposal of North Dakota

David K.

Delivery & Installation

“I have purchased tanks from other companies, but none are delivered and installed with less problems than Superior Tank.”

Donald S.

Excellent Work

“Just wanted to let you know that your work crew was excellent. Thanks for your professionalism.”

Jack C.

I only deal with Superior

“I DO NOT deal with any other bolted tank company, period. I deal only with Superior because of Huel, and he makes sure I get the best product that Superior has to offer and Huel stands behind what he puts his name on.”

John G.



Wednesday, July 11, 2018

Update to NFPA Standards for Water Storage

The NFPA 22 2018 edition was recently released with some changes that will impact the design of bolted steel tanks for fire protection. These revisions will reduce the costs of bolted steel tanks without compromising quality or performance. Below is a comparison of the latest changes to the NFPA 22:

Criteria2013 NFPA 222018 NFPA 22
In tank electric immersion heaters allowedNoYes
Bolted tank floor sheets placed directly on 4 mill polyethylene baseYesNo
Minimum tank ringwall foundation embedment2’-6” or below frost depth1’-0” or below frost depth
Minimum discharge pipe size< 25,000 gallons = 6” dia.
<100,000 gallons = 10” dia.
>100,000 gallons = 10” dia.
6” dia. and based on hydraulic demand
Minimum bottom ring thickness3/16” or use reduced tensile capacity equationStandard AWWA D103 requirements

The newest NFPA 22 edition also allows for electric immersion heating within the storage tank. In the past it was necessary to house the heating system in a separate building or vault and pump hot water or steam through coils to heat the tank. The new edition of the standard allows a new heating method that eliminates the cost of buildings or vaults, pumps, pipes and heating coils associated with other heating methods.

The requirement to include a polyethylene sheet under the tank bottom for leak detection has been removed allowing the bolted tank bottom to be placed directly on the fill material below. When Superior Tank installs a bolted steel tank, the bottom is vacuum tested to ensure leak-free operation.

Another cost reducing revision to the bolted tank foundation is the change from the foundation being embedded 2’-6” below grade or frost line to a much shallower requirement of 1’-0”. This reduces the amount of concrete and rebar needed to support and anchor the storage tank.

The prerequisite for a larger diameter discharge pipe with higher capacity storage tanks has been replaced with a 6” min. requirement as long as the pipe can support the expected flow rate.

NFPA eliminated the mandated minimum thickness for the bottom ring. Previously, the bottom ring of the bolted tank needed to be at least 3/16” thick or a reduced tension on the net section allowable was required. The reduced allowable tension on the net section stress resulted in greater shell thickness requirements compared to the standard AWWA D103 design requirement.

When all of these factors are taken into account, a bolted steel tank for fire protection under the new NFPA standard has reduced costs compared to previous versions.