News

#TankedTuesday – Sherwood Forest Campground

Location: Lesterville, MO
Tank Finish: Powder Coated
Application: Fire Protection

Industry: Fire Protection
Tank Standard: AWWA D-103
Capacity: 43,300 Gallons

Superior Tank Co., Inc. partnered with the Murray Company to install a new 43,000 gallon fire protection storage tank for the Sherwood Forest Campground in Lesterville, MO. Recently, Sherwood Forest Campground engaged in an aggressive building campaign to provide additional staff and camper cabins, an education center, new dining hall and kitchen, and a new health lodge to the campgrounds.

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#TankedTuesday – Sprinkler Fitters U.A. Local 709 Training Center

Location: Whittier, CA
Year Completed: 2019
Industry: Fire Protection

Tank Finish: Factory Powder Coated
Tank Standard: AWWA D-103
Application: Fire Sprinkler Training Center

Capacity: 13,400 Gallons

Fire sprinkler systems silently protect millions of Americans on a daily basis. When fire sprinklers are installed, the causality rate during a fire decreases by a whopping 81%. These essential yet complex fire sprinkler systems are designed and installed by highly qualified technicians with thousands of hours of certified training.

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Protecting a Precious Resource

water week 2019

Drinking Water is the essence of life and Superior Tank is proud to support the 2019 AWWA Drinking Water Week! Drinking Water Week was conceived over 40 years ago by the American Water Works Association (AWWA) to promote the vital role drinking water has in our lives. Only 1% of the water on earth is suitable to drink and without water a human can only survive 4-7 days. Drinking Water Week highlights the need to reduce water consumption and protect the various sources of drinking water including lakes, underground aquifers and rivers. Here are some basic ways you can make an impact!

  • Turning off the water when brushing your teeth saves up to 4 gallons of water.
  • Taking shorter showers as 10-minute shower can use 20 gallons of water!
  • 30% of total water consumption is outdoor use and only watering landscape when needed can reduce this percentage 0% of total water consumption is outdoor use and only watering landscape
  • Fixing running / leaking toilets can save 200 gallons per day
  • Use a hose with automatic shut off nozzle when washing your car or take to automatic car wash which recycles water
  • Upgrade to water efficient dishwashers and clothes washers: ask your local water agency if rebates are available!
  • Soak up any outdoor oil spills with absorbent then discard into trash
  • Repair cars with fluid leaks to avoid storm water contamination
Superior Tank is privileged to play a role in storing the precious resource of drinking water. Our bolted and welded steel water tanks are a key element in the drinking water distribution infrastructure, ensuring millions of people around the world can store drinking water in a secure and sanitary manner. Our storage tanks are second to none in quality and meet or exceed the worldwide accepted standards for potable water storage set by the AWWA such as the D100 and D103. In addition, we can provide bolted steel tanks with NSF 61/372 Certification for drinking water storage. Our powder coating system is one of the most environmentally friendly coatings available! We utilize an NSF Certified epoxy powder coating on the interior of our bolted tanks for potable water storage. Additionally, our application process reduces water consumption as it does not use water as the powder coating is applied dry in our production facility. Connect with us via social media for other ways you can help Protect the Source!

Changes to ladder safety requirements have arrived!

The Federal OSHA Occupational Safety and Health Standards requirements for fall protection on fixed ladders were revised in October of 2016 with some new requirements becoming effective after November 19, 2018. This revision relates to all ladders including those installed on bolted and welded steel ground storage tanks. All new ladders installed after November 19, 2018 extending over 24’ above a lower level must include a ladder safety or personal fall arrest system. Existing ladders, defined as ladders installed before November 19, 2018 must be equipped with one of the following items: ladder cage, ladder safety system or personal fall arrest system. All new ladders installed after November 19, 2018 will not be able to use a ladder cage as the exclusive fall protection method. Ladder cages will still be able to be used provided they are combined with a primary fall protection method such as a ladder safety or fall arrest system and the cage does not interfere with the primary system. After November, 19, 2036 all existing ladders not in compliance with the requirements for new ladders will need to be retrofitted to have either a ladder safety or personal fall arrest system.

A ladder safety system is designed to eliminate the possibility of your employees falling from the ladder. Similarly, a fall arrest system stops the fall before the worker impacts the surface below.

Ladder Safety Systems Commonly Includes

  • Lanyard
  • Connectors
  • Body harness
  • Carrier
  • Safety sleeve

Fall Arrest Systems Commonly Includes

  • Lanyard
  • Connectors
  • Body harness
  • Positioning system
  • Travel restraint system/deacceleration device

Ladder Cages Commonly Includes

  • Enclosure surrounding climbing space of ladder
For all new and existing fixed ladders with heights less than 24’ above a lower level, no fall protection is required by OSHA but ladder cages, ladder safety systems, or fall arrest systems can be used if desired.
Ladder Height and Installation DateHeight above Lower LevelFall Protection RequiredLadder CageLadder Safety SystemFall Arrest System
Existing Ladders (installed before 11/19/18)>24′YesMMM
New Ladders (installed after 11/19/18)>24′YesO ²MM
All Ladders after 11/19/36>24′YesO ²MM
All Ladders≤ 24′NoOOO
O = Optional, Not Required M = Meets OSHA Requirement ¹ Only 1 of the acceptable fall protection methods is needed to satisfy OSHA requirements ² Cannot be used exclusively, Must be combined with Ladder Safety System or Fall Arrest System

Another change in the regulation is the requirement of resting platforms. After November 19, resting platforms are required at maximum 50’ intervals when a cage is used and 150’ maximum intervals when a personal fall arrest or ladder safety system is used. Under the old regulation the maximum distance was only 30’ for each segment and if a safety device was used on a ladder for tower, water tank or chimney, a platform was not required at all.

In addition to ladder systems, Superior Tank offers other equipment to keep your workers safe while working with ground storage tanks. For example, tie-points at various locations on the tank such as around the roof hatch provide a suitable anchor for fall protection systems. Also, extending roof railing and installing OSHA required self-closing gates at openings can also prevent worker falls.

Please note, your local regulations may differ as select areas have regulations independent of Federal OSHA Requirements.  Our safety experts can recommend the right equipment to prevent injuries to your workers and comply with OSHA requirements to avoid fines and penalties. Contact us today to see how we can help!

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
Read More “Update to NFPA Standards for Water Storage”

Fire Season is coming soon!

Fire season is approaching fast and taking a few steps will ensure your bolted and welded storage tanks are ready:

  • Inspection of liquid level indicator to ensure accuracy
  • Confirm controls and valves are operating properly
  • Install seismic flex couplings on connections to prevent rupture
  • Fit tank with Storz fire department connections
  • Clean/inspect roof vents for sufficient airflow during high draw
  • Remove excess sediment from tank bottom to prevent sediment from being drawn into firefighting equipment

Read More “Fire Season is coming soon!”

ASCE 7 Update and the Impact on Bolted Tanks

The latest edition of the American Society of Civil Engineering (ASCE) 7-16 Standard for Minimum Design Loads and Associated Criteria for Building and Other Structures published in August 2017, includes an exception to the AWWA D103.  Section 15.7.7.2 relating to bolted steel tanks, includes new requirements regarding bolted tanks with an embedded steel base setting ring:

 
  • “b. For Type 6 tanks, the overturning ratio, J, as determined using AWWA D103, Eq. (14-32) shall not exceed 0.785.” This new verbiage has significance to bolted tank design as it impacts where a bolted tank with a Type 6 foundation can be used.
 

A Type 6 bolted steel tank utilizes a steel base ring shell embedded into the concrete foundation which also serves as the tank bottom.  The J ratio relates to the seismic loading and is a criteria used to determine if the storage tank requires anchorage.  A value of less than 0.785 indicates the tank wall will not experience uplift and does not need anchorage. Conversely, a J ratio greater than 1.54 requires the bolted tank to be mechanically anchored. Ratios between the two values may or may not require mechanical anchorage depending on other factors.

 

Essentially, the ASCE is requiring embedded shell bolted steel tanks not to be used in areas where uplift occurs due to seismic activity. The concern is there are no specific design requirements for  the anchorage of the shell to foundation and the concrete bottom included in the AWWA D103 therefore it is difficult to ensure ductility of the tank to foundation connection. There is a risk of the shell separating from concrete tank bottom during a seismic event as a design criteria does not exist to ensure the connection is properly designed. ASCE 7-16 does not restrict bolted tanks with other foundation types; only tanks with an embedded shell.

 

For most applications, Superior Tank Co., Inc. will design our bolted tanks to use foundation types 1 through 5. With foundation types 1 through 5, the storage tank will include a steel bottom which structurally ties into the bolted tank shell creating one uniform structure.

 

This new terminology is another example of how bolted tank standards are continuously evolving resulting in more resilient bolted steel tanks.

NSF International Certification for Bolted Tanks

NSF Storage Tanks

Superior Tank Company is proud to announce we have recently earned NSF International Certification for our bolted steel tanks over 14,309 gallons. NSF/ANSI 61 and 372 Certification of our bolted tanks demonstrates compliance to the internationally recognized health effects standard for drinking water system components. NSF International led the development of the American National Standards for all materials and products coming into contact with drinking water and NSF/ANSI 61 & 372 sets health effects criteria for many water system products, components and materials. For example, NSF International standards are used to verify the safety and performance of water treatment and plumbing components and to ensure these products do not leach harmful levels of contaminants into drinking water.

Read More “NSF International Certification for Bolted Tanks”

How Much Does A Bolted Steel Tank Cost?

33 Years of Bolted Tanks

One of the first questions we are asked is “how much does a bolted steel tank cost”? Unfortunately, the answer is a little complex as the price of a bolted tank is impacted by a variety of factors. Elements include storage tank design specification, relevant local building codes, quality of raw materials, scope of work included in the contract, manufacturer experience and tank installation team skills/training.

The various design specifications such as AWWA D103, NFPA 22 and API 12B determine tank appurtenances, shell design, steel thickness and even tank size in some cases. For example, the American Water Works Association (AWWA) D103 standard applies to all bolted tanks used for potable water storage and mandates the interior epoxy coating is NSF 61 certified. Bolted tanks for fire protection need to comply with the National Fire Protection Association (NFPA) 22 standards which requires specific tank components such as tank heating systems when needed and reinforced concrete ringwall foundation. When a bolted tank is used for oil storage, the American Petroleum Institute (API) 12B standard is commonly used as a reference but tanks do not have to comply. However, for customers desiring a guaranteed level of quality, the API 12B monogram program ensures the tank meets very specific design criteria and the bolted tank manufacturer is API Spec Q1 / ISO 9001:2008 certified.

Read More “How Much Does A Bolted Steel Tank Cost?”

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