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Home My WebLink AboutUNDERGROUND TANKABOVEGROUND/UNDERGROUND DOMESTIC TANKS 120 - 2,000 wg PROPANE - education 8 reseanh r r ,k COUNCIL _ Perked 41 by PERC , +ram,'• G� In overall performance ranking I., Protective Coatings applied - - F I 4 � ,i• i ,�:'r`k.`�' its _+3 F av, � ��f PROUDLY' FINISHED WITH POWDURA° OneCuwm Super Durable Topcoat with Zinc Rich Primer on Aboveground POWDURA®OneCureTm Two coat system properties include: • Zinc rich epoxy primer 8" dome in black plastic or white • Super durable TGIC polyester topcoat galvanized steel • 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 VIII, Division 1 • Registered with the National Board • #72 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 CONTAINERS 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.TrinityContainers.com Call Toll Free: 888-558-8265 TRINITY Containing Our World's Energy' o c7 = CD w = w _1 O OUTSIDE o DIAMETER 0 o_ 0 0 LEG WIDTH General Specifications Conforms to the latest edition of the ASME code for Pressure Vessels, Section VIII, Division 1. Complies with NFPA 58. Rated at 250 psig from -200 F. to 1250 F. All tanks may be evacuated to a full (14.7 psi) vacuum. Vessel Finish: Coated with epoxy red powder. ( Tanks Coate with the epoxy powder must be buried). For Aboveground u: tanks may be coated with TGIC powder. 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 or local regulations. OVERALL LENGTH DOME i 7' LEG -- WITHDRAWAL VALVE FLOAT oncE` rAS GAUGE �P'4 ANODE CONNECTION ® ® ,' FILLER I O 0,�-VALVE SERVICE / NAME MULTIVALVE PLATE RELIEF VALVE FITTINGS LAYOUT UNDER DOME AGUG VESSEL DIMENSIONAL INFORMATION All vessels dimensions are a proximate WATER OUTSIDE HEAD OVERALL OVERALL LEG LEG WEIGHT QUANTITY CAPACITY DIAMETER TYPE LENGTH HEIGHT WIDTH SPACING FULL PER LOAD STACK 120 wg. 24" Ellip 5' - 5 13/16" j 3' - 0" 10 1/8" 3' - 0" 245 lbs. 96 12 454.2 L 609.6 mm 1671.3mm 9,11.4 mm 257.2 mm 914.4 mm 111.1 kg. 250 wg. 31.5" Hemi 7' - 2 1/2" 3� - 7 1/2" 12 3/4" 3' - 6" 472 lbs. 63 9 946.3 L 800.1 mm 2197.1 mm 1104.9 mm 323.9 mm 1066.8 mm 214.1 kg. 320 wg. 31.5" Hemi 8' -11 3/4" 3' - 7 1/2" 12 3/4" 4' - 0 1/4" 588 lbs. 45 9 1211.2 L 800.1 mm 2736.9 mm 11104.9 mm 323.9 mm 1225.6 mm 266.7 kg. 500 wg. 37.42" Hemi 91.1011 4' -1 7/16" 15" 5' - 0" 871 lbs. 30 6 1892.5 L 950.5 mm 2997.2 mm 1255.7 mm 381.0 mm 1524.0 mm 395.1 kg 1000 wg. 40.96" Hemi 15' -10 13/16" 4' - 4 5/16" 16 1/4" 9' - 0" 1729 lbs. 15 5 3785.0 L 1040.4 mm 4846.6 mm 1344.6 mm I 412.8 mm 2743.2 mm 784.3 kg Rev: Jan. 27, 2016 r 1 Why Tanks Corrode Underground steel tanks corrode due to an electrochemical reactii between the tank and the surrounding soil. The process of corrosil occurs due to small voltage differences on the steel surface that rest in the flow of DC current from one location to another. Where curre flows from the tank into the soil corrosion occurs. This location is calif the anode in a corrosion circuit. Where current flows from the soil to tt tank, no corrosion occurs. The progress of corrosion is determined t the amount of current flowing between the anode and the cathode an whether the locations of the anode/ cathode remain constant over time Corrosion rates are generally higher in wet soil environments since th conductivity of the soil promotes the flow of DC current in the corrosioi circuit. Corrosion generally exhibits itself on underground tanks in either r general overall rusting or more commonly, a pitting attack. Pit locationi, may result from metallurgical conditions of the steel surface or soil variations such as rocks, salts, fertilizer, moisture concentration, oxygen concentration, etc. Preventing Corrosion Protecting underground tanks from corrosion is easily achieved bythe use Of two commonly applied Protection methods: external coating and cathodic protection. These two mpthnq& are complemental ;. and should be used i conjunction with th other. An effectiv coating insulates the steel from the soil environment, thus preventinj the flow of corrosion current from the anode to the cathode. An effectivi external coating can protect over 99% of the tank surface area. However no coating is perfect. Damage from construction or soil stresses create tiny defects, which may result in accelerated corrosion at the defect. Cathodic protection prevents corrosion at those defects by appl; DC current from an external source, forcing the tank to bec(' cathode. Application of sufficient DC current to the tank will prevent corrosion from occurring. The two general types of cathodic proteo systems are sacrificial and Impressed current. Sacrificial systems used when the amount of current required for the protection is sir such as in underground propane tanks. Impressed current syste are more commonly used for large structures such as large dlame pipelines. Electrical isolation of the tank from metallic piping systei and electrical grounds is critical for the cathodic protection systen effectiveness. How Sacrificial Cathodic Protection Works Sacrificial systems work by creating a galvanic connection between different metals. The most common anode material is magnesium, Which when coupled to steel results in. DC current flow from the magnesibm 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 9lb. 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 backflli. The anode and backflll 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 recomm endations for various sizetanks 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 reslstivitles 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. Sail Type Fertile Soils, clay, Sand, Gravel, Rocky Sandy Loam Areas Tank Cap. 5 to 5000 ohm -cm 6000 to 10000 ohm -cm (gai.l Size Qty. Alloy Size Qty. Alloy 120 91 1 H-1 .9# 1 H41 150 9# 1 H-1 9# 1 H-1 250 9# 1 H-1 9# 2 H-1 325 9# 1 H-1 9# 2 H-1 500 17# 1 H-1 9# 2 H-1 1000 17# 2 H-1 91 4 H-1 1500 17# 2 H-1 9# 4 H-1 2000 17# 3 H4 9# 6 1 H-1 "Based on 90% effective external coat/ng, 2 ma/ft2 yearAnode life. current density, and 30- 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. 1 anode 2 anodes 4 anodes 4.Anodes are shipped in either cardboard boxes or multi-v anode. If anode issuppliedve outer innPlastic bagtainer and , remtove he 1pl soth ticgtr before installing. 5. install anodes approximately two to three feet from the tank a atleast as deep as the center line of the tank. Anodes work bE In locations with permanent moisture, so generally the deep the better. 6-After placing the anode, stretch'out the anode connection wl and extend over to a connection point on the tank fill pipe. 7. Cover the anode with approximately six inches of backfill ar pour 5 gallons of water on the anode to saturate the prepare backfill. Water is necessary to activate the anode. 8. Connect the anode wire to the tank with a low electric resistance connection. Examples are threaded stud on tli tank fill pipe or any accessible metallic connection point to tii tank. All connections should be -coated with a moisture -prod material. 9. Ideally, the tank connection Is made in the area of the tank f I pipe within the covered dome. With access to the anode wine subsequent testing of the tank can include measurement of anode output and verification of performance. I 10.Verify performance of the anode using an appropriate test procedure. Mechanicv :° nnection 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 blacktest lead Into the Common jack on the meter, and connect the opposite end of the lead to a charged reference electrode (1/2 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 soli. 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 protected). Charging Reference Electrode STEP 1: Unscrew and remove porous plug end of new reference electrode. Add delonized 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 and 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 substances that may ccontact oil, road salts, or other ontaminate the solution by absorption through porous plug. Do not allow electrode to free7A_ I Ideal for use as a first stage regulator on any domestic size ASME or O� DOT container in propane gas installations requiring up to 1,500,000 UL BTU's per hour. The regulator Is factory set to reduce container pressure to an intermediate pressure of approximately 10 PSIG. Ordering Information LV3403TR 10 uver LV3403TRV9 Y„ F.NPT '/i' F.NPT '/a' PSIG 9. Maximum flow based an Inlet pressure 20 PSIG higher than the regulator setting and 1,500,000 ® LV3403TR ire 20% lower than the regulator setting and delivery pressure 20% lower than the setting. I 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 industrial furnaces or boilers. Also incorporated in multiple cylinder UL installations. Ordering Information LV4403SR4 5 11-5 LV4403TR4 '/� F. NPT 10 5-10 LV4403SR9 '/_" F. NPT LV4403TR9 �/4 0 15-10 Yes 2,500,000 LV4403SR96 F. POL 5 1-5 LV4403TR96 F.NPT 10 i 5-10 When used for final stage pressure control, must either incorporate Integral relief valve or separate relief valve should be specifled in accordance with NFPA Pamphlet 58. •• Maximum flow based on inlet pressure 20 PSIG higher than the regulator setting and idsilvery 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, I Ordering Information LV4403B4 I +/z' I LV4403B46 1/2" F. NPT 11" W.C. LV4403846R• #28 at 10 9"to 13" Over '/d' F. NPT Drill PSIG j W.C. Inlet LV4403B66 Inlet LV4403B66R" '/4 F. NPT Backmount design Maximum flow based an 10 PSIG inlet and 9" w.c. delivery pressure. I i 14 ! 935,000 LV4403 Series LV4403B Series fylaxlmum Capacity of PE Pipe In Thousands of BTU °7lth p Gs Pressure o,' 11,Per Hour of Liquefied Petroleum Gascl0 In- WC and a Pressure Drop of 0.8 in, bVC (based on a 1.62 specific gravity gas) 7073 720 571 67 5645 934 484 425 383 325 286 257 235 218 204 192 169 52 740 627 13900 1 561 1983 1331 1054 893 786 708 600 528 475 305 283 264 249 219 197 3563 2391 1894 1605 1412 1272 1078 948 864 435 403 376 354 311 280 4724 3247 2608 2232 1978 1792 1534 1369 1232 1 81 103 676 934 828 504 10063 6755 5361 4835 3989 3592. 3044 2678 223 73 723 676 636 828 750 ' 2267 2044 7910 1797 1581 1424 22 20 ao :ao 00 :eo •ae eaB 18 75 13 12 al Be /e to of 129 113 102 86 76 68 11 10 '- 9 9 8 167 147 132 112 63 58 54 51 48 8 8 5 7 238 209 188 160 140 126 1 6 75 70 66 63 b0 67 44 54 40 427 376 338 287 252 lld . 107 100 94 89 54 52 642 569 516 441 354 208 192 180 169 160 '152 81 78 76 1207 1061 956 810 712 642 587 544 508 4269 78 255 133 740 134 244 233 224 216 463 431 417 394 379 Maximum Capacity of PE Pipe in Thousands of BTU per Hour of Liquefied Petroleum Gas 5I68Tuh=7CF14 with a Gas Pressure of 2,6, psi and a Pressure Drop of 1 A psl (based on a 1.52 specific gravity gas) o ° o 1966 1319 1046 886 0 ° 11300 7586 6008 5D92 779 702 �595 fi23. 471 431 399 373 351 14652 9835 7790 6602 807 5229 4432 3898 3510 3213 29 5 2144 2018 17� 5 599 20877 14014 11100 9408 . 8275 7451 315 2780 2617 2302 2073 43429 25883 19946 16905 14869 13389 1348 9982 8988 8226 7618 71i9 6700 5894 5307 4578 4239 3962 3729 3280 2953 A3429 29848 23969 20518 18782 16474 14100 12496 11322 10417 7691 9092 6700 5894 5307 105963 71131 56339 47750 42000 37820 .2054 28194 25388 23234 21517 20108 18926 16647 14990 / 1 goo BI :11 236 207 187 158 139 ]26 D0 /IB oo ao IB 1865 1192 1073 958 ill 1Q6 9q /1 ae BOD 734 659 79 571 837 5 8 484 462 q7 74 2 1757 154E 1983 1159 478 934 �855 792 740 696 659 627 599 574 551 2503 $956 1983 1680 ]478 1331 1218 1128 1054 4498 3956 3563 3079 2656 2391 2189 2027 1894 1783 1688 1606 1 33 1g69 1412 5903 6232 4740 4057 3596 3258 4697 2788 2b94 2471 1688 4239 1833 1469 1412 1270E 11175 10063 8529 7502 676E 6182 572E 5350 5036 4347 .453E 4331 2060 3988 1Uidximurn Capacity of PE Pipe in Thoul ands of BTU per Hour of Liquefied Petrole 2516t3TUh=1CFH With a Gas Pressure of 10,0 psi and a Pressure Drop of 1.0 psi um Gds (based on o j.62 specific gravlfy gas) a ° ° ° 2476 1 - 1662 I31(i 1176 981 484 1 ' 1 ° 749 659 14234 9555 7568 6414 5642 5080 9306 3787 3410 3121 2890 2701 2542 2236 2014 593 543 503 470 442 389 350.. 1846E 12388 9812 8316 7375 6587 6683 4910 4422 4047 2611 ea 37 8747 3502 26296 17652 13981 11849 10423 9385 � 8947252 6300 .5766 5340 469712321293 18729 16865 14294 12572 46976337087 29782 25489 22591 20469 17519 959E133476 89601 6685 4697 7423 .668560148 2714068 12943 12Q41 11297 10671 94586685 I 6 35529267 27104 26329 23840 20970 l8882 297261 235 17051 58o 00 1251707 1501 1o Io 118 ill li4b 1008 907 830 569719 of 11 97 932213 1946 1753 60610] 640 09 682 557 53161176 i077 997 1 3153 2773 2497 2116 1862 1676 1534 9421 1328 1250 1183 1125 107E 123 997 830 790 754 723 � 695 566E 4983 4487 3803 3345 3012 21 2553 2386 2246 2126 2022 1931 1851 1779 7334 6500 5890 SD41 4468 4048 3729 3465 3251 3071 2916 2782 2931 1851 2476 16004 14077 12676 10743 9449 8509 7i87 7212 6739 6071 343. 600E 2782 545E 5227 2466 5024 2516BTuh=7CFH Ph; 1,800.662,0208 Fax; 615.325.9407 u Web; tivww.gastiti .com 7