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Home My WebLink AboutGAS TANK PRODUCT INFORMATION- l ABOVEGROUND/UNDERGROUND DOMESTIC TANKS 120-2,000 w9 4 k i a, y?eryYf��' :X/Yt�+�.v~Li Mti �..•.n(��•n^!yj`x�g4 8" dome in black plastic or white galvanized steel CONTAINERS NEW! POWDURAO OneCureP Super Durable Topcoat with Zinc Rich Primer on Aboveground POWDURA® OneCureT" Two coat system properties include: • Zinc rich epoxy primer • Super durable TGIC polyester topcoat • Superior corrosion and edge protection • Patent pending formulated primer and topcoat • Dual service options for above or underground applications • Option #1: Ready -to -bury red oxide durable powder coating with black • polyethylene AGUG dome* • Option #2: Aboveground option with steel 8" AGUG dome • All valves and float gauges are centered under dome • Fabricated to the latest A.S.M.E. Code, Section Vill, Division 1 • Registered with the National Board • 472 liquid level outage valve orifice reduces refueling emissions • Vacuum pre -purged to save time, money and product *Applicable federal, state, or local regulations may contain specific requirements for protective coatings and cathodic protection. The purchaser and installer are responsible for compliance with all federal, state, local and NFPA industry regulations. Cathodic protection is required and coating must be continuous and uninterrupted and must comply with an local, state or national code. www.TrinityContainei-s.com Call Toll Free: 888-558-8265 . 9 w x J TRINITY'D Containing Our Wor/d's Energf" vvIu i n General Specifications Con 'rms to the latest edition of the ASME code for Pres''ure Vessels, Section Vill, Division 1. Complies with NFP 58. Rated at 250 psig from -20° F. to 125' F. All tanks may be evacuated to a full (14.7 psi) vacuum. Vess il Finish: Coated with epoxy red powder. (Tanks' coated with i je epoxy powder must be buried). For Aboveground use, tanks may be coated with TGIC powder. Appli ;able federal, state or local regulations may contain spec' is requirements for protective coatings and cathodic prote q tion. The purchaser and installer are responsible for comp lance with all federal, state or local regulations. All vess4lls dimensions are ai i WAT R I OUTSIDE CAPAITY DIAMETER 120 g. 454. !L 250 :q. 320 vl . 12 .4{ L 500 W j. 1892. 'iL 1000 24" 609.6 mm 31.5" 800.1 mm 31.5" 800.1 mm 37.4211 950.5 mm 40.96" 1040.4 mm _ -' �, WITHDRAWAL VALVE LP. GL4 FLOAT ,'/ . W GAUGE ANODE -CONNECTION FILLER O O�'VALVE SERVICE MULTIVALVE \. PNAME LATE RELIEF VALVE FITTINGS LAYOUT UNDER DOME Huuu Vt55EL DIMENSIONAL INFORMATION oximate HEAD I OVERALL I OVERALL TYPE LENGTH HEIGHT Ellip 5'- 5 13/16" 3' - 0" 1671.3mm 911.4 mm Hem! 7'-21/2" 3'-71/2" 2197.1 mm 1104.9 mm Hemi 8' -11 3/4" 3' - 7 1/2" 2736.9 mm 1104.9 mm Hem! 9' -10" 4' -1 7/16" 2997.2 mm 1255.7 mm Hemi 15' -10 13/16" 4' - 4 5/16" 4846.6 mm 1344.6 mm LEG LEG WEIGHT QUANTITY WIDTH SPACING FULL PER LOAD STACK 10 1/8" 3' - 0" 245 lbs. 96 12 257.2 mm 914.4 mm 111.1 kg. 12 3/4" 3' - 6" 472 Ibs. 63 9 323.9 mm 1066.8 mm 214.1 kg. 12 3/4" 4' - 0 1/4" 588 Ibs. 45 9 323.9 mm 1225.6 mm 266.7 kg. 15" 5' - 0" 871 lbs. 30 6 381.0 mm 1524.0 mm 395.1 kg 16 1/4" 9--0" 1729 Ibs. 15 5 412.8 mm 2743.2 mm 784.3 kg Rev: Jan. 27, 2016 Why Tans Corrode Underground steel tanks corrode due to an electrochemical reaction between 'e tank and the surrounding soil. The process of corrosion occurs du to small voltage differences on the steel surface that result in the flomof DC current from one location to another. Where current flows frorrthe tank into the soil corrosion occurs. This location is called the anode n a corrosion circuit. Where current flows from the soil to the tank, no corrosion occurs. The progress of corrosion is determined b the amour of current flowing between the anode and the cathode and whether th locations of the anode/ cathode remain constant overtime. Corrosion rates are generally higher in wet soil environments since the conductivii of the soil promotes the flow of DC current in the corrosion circuit. Corrosion generally exhibits itself on underground tanks in either a general ove all rusting or more commonly, a pitting attack. Pit locations may result rom metallurgical conditions of the steel suraface or soil variations si ch as rocks, salts, fertilizer, moisture concentration, oxygen concentrati n, etc. coating intu the flow of cc external coat no coating is tiny defects, Cathodic pi DC current Preventing Corrosion Protecting underground tanks from corrosion is easily achieved by the use Of two commonly applied Protection methods: external coating and cathodic protection. These two methods are complementary and should be used in conjunction with the other. An effective external protective s the steel from the soil environment, thus preventing Sion current from the anode to the cathode. An effective can protect over 99% of the tank surface area. However, feet. Damage from construction or soil stresses create ch may result in accelerated corrosion at the defect. n prevents corrosion at those defects by applying an external source, forcing the tank to become in of sufficient DC current to the tank will prevent any urring. The two general types of cathodic protection vial and Impressed current. Sacrificial systems are )unt of current required for the protection is small, 'ound propane tanks. Impressed current systems y used for large structures such as large diameter isolation of the tank from metallic piping systems ids is critical for the cathodic protection system's thodic Protection Works work by creating a galvanic connection between two different metals. The most common anode material is magnesium, which when coupled to steel results in DC current flow from the magnesium to the steel. The open circuit potential of steel is about -0.50 volts referenced to a copper sulfate electrode. The open circuit potential of magnesium is about -1.55V to-1.80V. By connecting the two metals together, the difference of 1 to 1.25V volts results in current flow to the tank that overcomes the natural corrosion cells that exist on the tank. With this current available to the tank, no corrosion occurs. Magnesium Anodes There are a variety of anode sizes and alloys used for cathodic protection. The two primary alloys are designed as H-1 (or AZ63) and High Potential. The H-1 alloy is produced from recycled magnesium and has an open circuit potential of approximately—1.55V. This alloy is well suited for protection, of underground propane tanks. The High Potential alloy is 99% pure magnesium having an open circuit potential up to -1.8V. This alloy should be used for soil applications over 10,000 ohm -cm resistivity. The two most common anode sizes used for underground propane tanks are 9 lb. and 171b. The size designation relates to the metal weight. 10' of #12 TW insulated wire is attached to the anodes. Anodes are then backfilled in a mixture of gypsum, bentonite, and sodium sulfate to lower the electrical resistance of the anode to soil. The mixture is a low cost, nonhazardous, electrically conductive backfill. The anode and backrill is then packaged in a cotton bag and either a cardboard box or paper bag. Actual shipping weight of these anodes with backfill is 27 lb. and 45 lb. Application Recommendations Magnesium anodes can protect underground tanks in most soil conditions. The H-1 alloy is generally very effective. The following chart Provides size and quantity recommendations for various size tanks based on conservative design assumptions. This chart covers soil conditions up to 10,000 ohm -centimeter resistivity. Resistivities higher than 10,000 ohm -centimeter generally represent very dry soils. Verification of soil resistivity can be performed through soil analysis. Contact us for design recommendations in locations where soil resistivities exceed 10,000 ohm -cm, or if there is no effective external coating on the tank. The propane service line from the tank to the house also must be considered in the cathodic protection design, unless the service line is plastic. All underground steel pipe should be externally coated with a corrosion resistant material. The service line should be electrically isolated at the house with an insulating fitting or union. If service pipe is less than 50' in length, the tank anodes will provide sufficient current to protect both tank and pipe. For longer lengths of pipe, an additional anode may be required at the house- connections. If another metallic material such as copper is used for service piping, the pipe should be electrically Isolated from the tank at the fill pipe connection. Copper and steel create a galvanic couple that will accelerate corrosion of the steel tank when directly connected to copper piping. Generally, copper piping does not require cathodic protection. • Soil Type ile S s 101 SaL, ravel, Rocky T y° * Areas 'nk Cap., ( 9a1.) 5000 to 10000 ohm -cm Ay Size Qty. Alloy �120 _ 9# 1 H-1 250 H-1 x H 9# 2 H-1 325 " 9# 2 H-1 WIT 500 l 9# 2 H-1 H-1 000 6 H-1 "Based on yearAnodelife. 10% effective external coating, 2 maM current density, and 30- Anode Ins lallation 1. Deten 2. When line size and quantity of anodes from application chart. a single anode is installed, it tank c should be located near the inter on either side of tank. 3. When multiple anodes are installed, the tar space them evenly around k. See examples below. i ano e 2 anodes 4 anodes C__D 4. Anodes, are shipped in either cardboard boxes or multi wall Paper s�cks. Remove outer container and bury the cloth bagged anode. f anode is supplied in plastic bag, remove plastic bag before installing. 5. Install modes approximately two to three feet from the tank and at least 's deep as the centerline of the tank. Anodes work best in locations with permanent moisture, so generally the deeper the be r. 6.After plaIng the anode, stretch out the anode connection wire and exte d over to a connection point on the tank fill pipe. 7. Cover th ' anode with approximately six inches of backfill and pour 5 g Ilons of water on the anode to saturate the prepared backfill. MNater is necessary to activate the anode. . 8. Connect the anode wire to the tank with a low electrical resistanoli connection. Examples are threaded stud on the tank fill p pe or any accessible metallic connection point to the tank. All connections should be coated with a moisture -proof material. I 9. Ideally, tfi tank connection is made in the area of the tank fill Pipe withi J the covered dome. With access to the anode wire, subseque ''t testing of the tank can include measurement of anode out'„ut and verification of performance. 10.Verify pe ormance of the anode using an appropriate test procedure Mechanic Connection Under Dome Cathodic Protection Testing Procedure Equipment Needed: Digital Voltmeter, Red Test Lead Min. 12' Long & Black Lead Min. 2' Long, Reference Electrode (Copper/Copper Sulphate Half -Cell) STEP 1: Using a digital voltmeter insert the red test lead into the Volt jack of the meter and select the 2 or 20 volt DC scale. Clip red test lead connector to an uncoated metallic area of the tank, preferably to the fill pipe multivalve. A good solid connection is very important. (DO NOT connect to shroud). STEP 2: Insert the black test lead Into the Common lack on the meter, and connect the opposite end of the lead to a charged reference electrode (% cell). STEP 3: Remove protective cap from the porous plug at bottom end of electrode. Place porous plug end into native soil (remove grass if necessary) at four locations around the tank (one on each side of the tank, and one at each end of the tank). If difficulty is encountered obtaining readings, moisten soil with water or dig'/ cell deeper into the soil. STEP 4: Record all four meter readings on an appropriate form. The least of all four readings should be a minimum of-0.850v or more negative. {Note: If any of the four readings are below (less negative) -0.850v then the tank is not fully protectedl. Charging Reference Electrode STEP 1: Unscrew and remove porous plug end of new reference electrode. Add deionized or distilled water to the copper sulfate crystals, filling electrode completely. The solution will turn blue in color and there should always be excess crystals at the bottom of the tube. DO NOT USE TAP WATER. STEP 2: Replace porous plug end of electrode and place in an upright Position so that the porous plug end is facing in the down position and let stand for 1 hour before use. This will allow the porous plug to become completely saturated before use. Caution: Do not allow electrode to contact oil, road salts, or other substances that may contaminate the solution by absorption through porous plug. Do not allow electrode to freeze_