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Home My WebLink AboutTANKS• � ll TRINITY'- Conta/ning Our Worlds Energy- 0 ; Cg w x x co LU OUTSIDE 0 0 DIAMETER 0 R 0 F- LEG WIDTH General Specifications Conforms to the latest edition of the ASME code for Pressure Vessels, Section Vill, Division 1. Compliers with NFPA 58. Rated at 250 psig from -20' F. to 1250 F. All tanks may be evacuated to a full (14,7 psi) vacuum. Vessel Finish: Coated with epoxy red powder. ( Tanks coated with the epoxy powder must be buried). For Aboveground use, tanks may be coated with TGIC powder. Applicable federal, state or local regulations mayicontain specific requirements for protective coatings and,cathodic protection. The purchaser and installer are responsible for compliance with all federal, state or local regulations. .�'-.... WITHDRAWAL VALVE FLOAT OTICE` GAUGE LP. W ANODE ® :- CONNECTION I ® ' FILLER O OX-VALVE 1, O SERVICE/ NAME MULTIVALVE PLATE RELIEF VALVE FITTINGS LAYOUT UNDER DOME AGUG VESSEL DIMENSIONAL INFORMATION All vessels dimensions are approximate WATER CAPACITY OUTSIDE DIAMETER HEAD TYPE OVERALL LENGTH OVERALL HEIGHT LEG WIDTH LEG SPACING WEIGHT 120 wg. 454.2 L 250 wg. 946.3 L 24" 609.6 mm 31.5" 800.1 mm Ellip Hem! 5' - 5 13/16" 1671.3mm 7' - 2 1/2" 2197.1 mm 3' - 0" 911.4 mm 3' - 7 1/2" 1104.9 mm 10 1/8" 257.2 mm 12 3/4" 323.9 mm 3' - 0" 914.4 mm 245 lbs. 111.1 kg. 3' - 6" 1066.8 mm 4' - 0 1/4" 1225.6 mm 472 lbs. 214.1 kg. 588 lbs. 266.7 kg. 320 wg. 1211.2 L 31.5" 800.1 mm Hemi 8' -11 3/4" 2736.9 mm 31.7 1/2" 1104.9 mm 12 3/4" 323.9 mm 500 wg. 1892.5 L 37.42" 950.5 mm Hem! 91.1011 2997.2 mm 4' -1 7116" 1255.7 mm 15" 381.0 mm 51.011 1524.0 mm 871 lbs. 395.1 kg 1000 Wg. 3785.0 L 40.96" 1040.4 mm Heml IS'- 10 13/16" 4846.6 mm 4' - 4 5/16" 1344.6 mm 16 114" 412.8 mm 91.011 0" 2743.2 mm 1729 lbs. 784.3 ka QUANTITY FULL PER LOAD STACK 96 12 63 9 45 9 30 6 15 5 Rev; Jan, 27, 2016 Why Tanks Corrode Underground steel tanks corrode due to an electrochemical reaction between the tank and the surrounding soil. The process 'of corrosion occurs due to small voltage differences on the steel surface that result In the flow of DC current from one location to another. Where current flows from the tank into the soil corrosion occurs. This location Is called the anode Ina corrosion circuit. Where current flows from the soil to the tank, no corrosion occurs. The progress of corrosion Is determined by the amount of current flowing between the anode and the cathode and whether the locations of the anode/ cathode remain constant over time. Corrosion rates are generally higher In wet soil environments since the conductivity of the soil promotes the flow of DC current in the corrosion circuit. Corrosion generally exhibits itself on underground tanks In either a general overall rusting or more commonly, a pitting attack. pit locations may result from metallurgical conditions of the steel surface or soil variations such as rocks, concentration, etc. salts, fertilizer, moisture concentration, oxygen Preventing Corrosion Protecting underground tanks from corrosion is easily achieved by the use of two commonly applied - protection methods: tt external coating and cathodic protection. These two methods are complementary and should be used in conjunction with the other. An effective externcoating Insulates the steel from the soil environment, protective the flow of corrosion current from the anode to the cathode. An effective external coating can protect over 99% of the tank surface area. However, no coating is perfect. Damage from construction or soil stresses; tiny defects, which may result in accelerated corrosion at the defect. Athodic protection prevents corrosion at those defects by applying X current from an external source, forcing the tank to become ;athode, Application of sufficient DC current to the tank will prevent any orrosion from occurring, The two general types of cathodic protection ystems are sacrificial and Impressed current, Sacrificial systems are sed when the amount of current required for the protection is small, ach as in underground propane tanks. Impressed current systems -e more commonly used for large structures such as large diameter pelines. Electrical Isolation of the tank from metallic piping systems id electrical grounds is critical for t Fectiveness, he cathodic protection system's ;w Sacrificial Cathodic Protection Works crificial systems 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 backf Ill. The anode and backflll is then packaged In a cotton bag and either box or Paper bag. Actual shipping weight of these anodea cardboard l is 27 lb. and 45 ib, s with bcardboard 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 forvariou on conservative design ass size tanks based sumptions, This chart covers soil conditions UP to 10,000 ohm -centimeter resistivity. Res(stivities 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. Is less than 50' in lThe service line should be electrically isolated at the house with an insulating fitting or union. If service pipe ength, 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, Equipment Needed: Digital Voltmeter, Red Test Lead Min.12' Long & Black Lead Min. 2' Long, Reference Electrode (Capper/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 blacktest lead Into the Common jack on the meter, and connect the opposite end of the lead to a charged reference electrode (lei 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 11 cell deeper into the soil. STEP 4: Record all fourmeter 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 protected). 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. Caullon: do not allow electrode to conlact oil, road salts, or other substances that may contaminate the solutlon by absorptlon through porous plug, Do not allow electrode to /reeyp Sell Type Tank Cap. (gal.) 120 510 250 325 500 1000 1500 2000 Fertile $oils, Clay, Sandy Loam Sa_, avel, Rocky - ffeas 5 to 6000 ohm -cm 5000 to 10000 ohm -cm Size Qty. Alloy Size Aty. Alloy 9# 1 H-1 9# 9# 1 H-1 9# 9# 1 H-1. 9# 21 H-1 a# 1 H-1 17# 1 H-1 17# 2 H-1 i7# 2 H-1 17# 3 H-1 9# 1 2 9# 1 2 9# 4 Meehan' 1.;- Under Dome H-1 Cathodic Protection Testing Procedure I 6 1 H.i -Based on 80% effeetive external cvating, 2 maV current d- e— n— —1 30. Year Anode life. Anode installation 1. Determine size and quantity of anodes from application chart. 2. When a single anode is Installed, It should be located near the tank center on either side of tank. 3. When multiple anodes are installed, space them evenly around the tank. See examples below. 7 anode 2 anodes 4 anodes r' n� 4.Anodes are shipped in either cardboard boxes or multi -wall papersacks. Remove outer contain or and burythe cloth bagged anode. If anode Is supplied in plastic bag, remove plastic bag before installing. 5. Install anodes approximately two to three feet from the;tank and at least as deep as the center line of the tank. Anodes work best In locations with permanent moisture, so generally the deeper the better, 6.After placing the anode, stretch out the anode connection wire and extend over to a connection point on the tank fill pipe. 7. Cover the anode with approximately six Inches of backfill and pour 5 gallons of water on the anode to saturate the prepared backflll. Water is necessary to activate the anode. 8. Connect the anode wire to the tank with a low electrical resistance connection. Examples are threaded stud, on the tank fill pipe or any accessible metallic connection point to the tank. All connections should be coated with a moisture -proof material. 9.Ideally, the tank connection is made In the area of the 'tank fill Pipe within the covered dome. With access to the anode wire, subsequent testing of the tank can include measurement of anode output and verification of performance. 10.Verify performance of the anode using an appropriate test procedure. Ideal for use as a first Stage regulator on any domestic size ASME or DOT container In propane gas Installations requiring up to 1,500,000 dwokb BTU's per hour. The regulator is factory set to reduce container UL pressure to an intermediate pressure of approximately 10 PSIG. Ordering Information Lv3403TRv9 1/0 F NPT I 1/" F.NPT '/" I P10 Over Outlet 1,500,000 I LV3403TR 9 00 Mexlmum flow based an Inlet pressure 20 PSIG higher than the regulator'setting and delivery pressure 20% lower than the regulator setting and deliver y pressure 20% lower then the setting. Provides accurate first stage regulation in two -stage; bulk tank systems. Reduce tank pressure to an intermediate pressure of 5 to 10 PSIG. Also used to supply high pressure burners for applications like ,ys�u,Fa industrial furnaces or boilers. Also Incorporated in multiple cylinder `(UL installations. Ordering Information LV4403SR4 LV4403TR4 '/2" F. 1-5 5LV4403SR9 ' F. NPT 10 5-10LV4403TR9 INP F. P1,0 5-10Yes '+YV 5LV4403SR96 2,500,000 LV4 003TR96 V F.NPT 5 1-5 1D 5-10 When used for final stage pressure rwntrel, must either Incorporate with NFPA Pamphlet 58. Integral relief valve or separate relief valve should be specified in accordance Maximum flow based on Inlet pressure 20 PSIG higher than the regulator selling and delivery pressure 20% lower than the setting. Designed to reduce first stage pressure of 5 to 20 PSIG down to burner pressure, normally 11" w.c. Ideal for medium commercial Installations, multiple cylinder Installations and normal domestic loads. Ordering Information LV4403B44NPT Y., LV4403B46 1/z" F.LV4403846R* #28LV4403866F. NPT DrillLV4403866R* s�„F Backmount design Mexlmum flow based on 10 PSIG inlet and 9" w.c, delivery pressure. 14 11" w.c. at 10 9" to 13" Over PSIG w.c. Inlet 935,000 Inlet LV4403 Series LV4403B Series