UL2085 Fire Rated AST ConVault

 

 

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ConVault tanks construction process consists of four main steps, namely:

Steel tank construction                           
Secondary containment                            
Concrete Vault                                       
Coating and Finishing

Steel tank construction

  • ConVault steel tanks are made of 18", 3/16" or 1/4" thick steel, depending on warranty and tank size.  The steel tank contains and holds the liquid fuel, which is the primary function of the tank.  To make the steel tank systems fit for their function, the steel tanks are made in accordance with the UL standard 142 and ULC standard S601.  The UL/ULC standards cover all the aspects of tank fabrication including material specification, fabrication, welding and testing.  The tanks are listed in accordance with UL/ULC Standards and carry UL/ULC labels as such.

  • At the fabrication shop, the tanks undergo a number of quality control and test procedures including a 24 to 48 hour pressure test at five (5) psig.

Secondary Containment

  • The second stage of manufacturing consists of wrapping the steel tank with a minimum of 1/4" thick Styrofoam (foam) insulation and an impervious barrier of 30-Mil poly provides containment for the remote probability of a fuel leak through the steel tank.  A leak detector pipe terminating in the secondary containment provides a positive-proof that the tank in not leaking.

  • Another advantage of the 30-Mil poly is that it shields and protects the steel tank exterior fro, coming in direct contact with concrete and thus minimizes the potential risk of tank external corrosion.

  • Certain Authorities Having Jurisdiction require metallic secondary containment.  ConVault manufactures double wall steel tanks to meet the above requirements.  The secondary steel containment is wrapped in 30-Mil poly to prevent external corrosion.  In effect this tank system provides triple containment, namely, primary steel tank, the secondary steel tank and tertiary 30-Mil poly.

The Concrete Vault

  • The next step of manufacturing a ConVault tank is to encase the tank in a six (6) inch thick reinforced concrete vault. Simply put, the six (6) inches of concrete is poured on all sides bottom and top of the tank in one step and hence the phrase "monolithic". This process assures that there are no joints and no heat sinks in the concrete to carry heat from a fire into the primary containment. The combination of the 30 mil poly and six (6) inch concrete provides a protected secondary containment system.

  • The concrete pouring process also goes through a strenuous quality control procedure to make sure the ConVault tank withstands its ultimate performance test; namely the two (2) hour fire test, the vehicle impact resistance and ballistic impact resistant tests. ConVault tanks are listed by UL 2085 Standard and ULC S655 (ULC/ORD 142.16) as fire resistant, insulated and protected tank

Coating and Finishing

  • At the final stages of manufacturing, the concrete exterior of the tank is vacuum coated using a two-part water based epoxy paint to protect the tanks from the inclement weather conditions. Concrete exterior can also be produced in exposed aggregate with a clear coat of sealant, in STO finish or in Perma Crete finish. The entire pipefitting and nipples on the tank are powder-coated to protect them from corrosion.

Additional Features

The following is a list of some of the major features and advantages of the ConVault tanks:

Complying with Environmental and Fire Safety Requirements

  • ConVault tanks meet applicable safety requirements for secondary containment, leak monitoring, and spill protection. ConVault tanks are approved by regulators and fire officials in most local jurisdictions of the United Sates and many foreign countries. Convault tanks are installed in 26 different countries worldwide.

  • ConVault tanks meet NFPA 30, NFPA 30A; UFC, BOCA, SBCCI, and IFC model fire codes safety standards. The units also comply with the 1996 Uniform Fire Code (UFC) Appendix A-II-F for the aboveground storage and dispensing of motor fuels.

  • ConVault tanks are certified by the California Air Resources Board for Balanced Phase 1 and Phase 2 Vapor Recovery including methanol and ethanol.

UL/ULC Listed

The ConVault tanks have the following UL and ULC listings:

  • UL - 142, aboveground tanks for flammable and combustible liquids.

  • UL - 2085, two-hour furnace fire test and two hour simulated pool fire test for insulated fire resistant and protected tank.

  • UL - 2085, insulated and protected secondary containment aboveground tanks for flammable and combustible liquids

  • UL - 2085 and UFC SECTION (79-7) vehicle impact and ballistic impact test for protected tank.

  • UL - 2085/ULC S655 (CAN ORD-C 142.16) Non-Metallic Secondary Containment and Venting by Form-of-Construction.

  • UL - Subject 2244 Systems Listing for Motor Vehicle Fuel Dispensing.

  • UL CAN/ORD - C 142.16, protected aboveground tank assemblies for flammable and combustible liquids

  • UL CAN/ORD - C 142.5, concrete encased aboveground tank assemblies for flammable and combustible liquids

  • UL CAN/ORD - 142.16, the furnace burn and 142.5, the open (pool) fire testing for two-hour fire rating

Overfill Protection - Tanks can be provided with the following methods to protect them against overfill: (a) direct reading level gauge at the tank which is visible from fill pipe location; (b) valve located within fill-pipe access to close or restrict flow automatically at a specified fill level; (c) audible high level alarm activated by a float switch at a specified fill level.

Venting - The ConVault tank systems are furnished with a 2 inch normal vent and an emergency pressure relief system. The emergency relief system furnished with the tank normally opens if the tank pressure exceeds 1/2 psig. The tank systems conform to the national model fire codes and UL/ULC Standards for venting.

Convault secondary containment is listed and approved by UL/ULC for "Venting by Form of Construction" and therefore is not required to be equipped with emergency venting device for secondary containment.

Support Legs - Vaults have concrete support legs of unitized monolithic construction that provide visual inspection capability. Tanks do not require cathodic protection system as no steel part of the tanks comes in direct contact with the ground.

Thermal and Corrosion Protection - The tank construction includes thermal insulation to protect against temperature extremes and corrosion by separating the steel tank from the concrete. No part of the steel tank comes in direct contact with concrete or other corrosive materials. All nipples, manway and spill container are powder coated for protection against corrosive elements.

Spill Containment - The tank system includes a 5 to 15 gallon, powder-coated UL-Listed and patented, spill containment surrounding the fill pipe. The spill container is equipped with a normally closed hand operated valve that can be actuated to drain the spilled fuel liquids into the primary steel tank.

Vehicle impact resistance - ConVault tanks are designed to have a low center of gravity that can withstand vehicle impact and tipping during earthquakes and other natural disasters. ConVault tanks have withstood even phenomenon tests such as C-130 aircraft impact at Dobbins AFB in Georgia, Hurricane Andrew and the 1989 Loma Prieta earthquake

Ballistic Resistance - ConVault tanks withstand bullet resistance tests in compliance with UFC SECTION (79-7) APPENDIX # A-II-F-1. and UL 2085 standard for Protected tanks

Non-Metallic Secondary Containment - The UL 2085 Standard listing officially recognizes ConVault tank of having a secondary containment. Technically, this is equivalent to a protected and insulated double wall steel tank. Therefore, the Convault tank provides you a secondary containment equivalent to a double wall steel tank plus protection of six-inch reinforced concrete.

NOTICE: UL Standard 2085 requires Aboveground Storage Tanks (AST) to be evaluated to determine acceptability for continued use after fire exposure, physical damage, or misuse.

Tanks' Weights and Dimensions

Figures No. 2, 3, 4 and 5 give nominal capacities, the outside dimensions, general fittings layout and approximate weights of some popular ConVault systems. These are representative sizes, dimensions and weights only. While all sizes and shapes listed are available, they may not be available from your local plant. Also, some plants have additional size and dimension options that are not listed here. To prevent installation problems, and to optimize your fuel storage site, please check with your local ConVault representative before specifying or beginning site development plans. More accurate tank weights can also be obtained from your local ConVault representative to help you in arranging proper equipment for the safe unloading and setting of tanks.

 

 


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