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HomeMy WebLinkAboutGAS TANK PAPERWORKr: �r i� rolt I '* X r i ,.� Panlrerl $T by PERC ,t - in rm overll perfoance ranking i y w for Protective Coatings applied *" its' ' _ "=• � on UndergroundPropaneTanks ? fj IIt�Ilj,���Nr(I IN LI �J ��AW 'Y4s�-.. ".. •.a.2ciw- _ - _- _._ sEt1i'._-�.'�.�",G13�Jc'�"r .. .�,. . _ 'sc� 8" dome in black plastic or white galvanized steel UU RECEIVED OCT 03 2018 h; Lucie Cou.nty,. Hgrhiitting r � 1 .s R- W Pfn ❑ ' PQI�1lDU B ®ilBCa�iC "haft ,r �> abl�erTo oat :? NN I � I Pry` with Zln tR h I 1 rnerr onkAti��regrouftd� ' .. P0WIi1`UR/°�arreCureTw coatsyferiGprap�7ti rcludes '� •� Znc�.r,�lalep''dxy;primer- - ' f - 5uperdurablTG�G polyesYerR top'coa I s - �s Sirperiait cor�o�onrantl��e�tlga:?pro`�ecf�onl , , i s'Fatentpert<l�ng Poemtilatdtp�meantirnpcoat • 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 • 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 TrinityContainers.com Call Toll Free: 888-558-8265 i TRINfi f N. ®/ ©I_3 Containing Our World's Energy" C L C VVIUIN General Specifications Conforms to the latest edition of the ASME code for Pressure Vessels, Section Vlll, Division 1. Complies with NFPA 58, Rated at 250 psig from -20' F. to 125' 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 may contain specific requirements for protective coatings and cathodic protection. The purchaser and installer are responsible for complI lance with all federal, state or local regulations, r%%1coo1 I I ❑AIRTLI - - WITHDRAWAL VALVE FLOAT OTICE`� ® GAUGE �P- cas ANODE 0 �O�-CONNECTION FILLER ' I � VALVE I 4 , I , SERVICE/ NAME MULTIVALVE PLATE RELIEF VALVE FITTINGS LAYOUT UNDER DOME AGUG VESSEL DIMENSIONAL INFORMATION All vessels dimensions are approximate i WATER OUTSIDE HEAD OVERALL OVERALL LEG LEG WEIGHT QUANTITY CAPACITY DIAMETER TYPE LENGTH HEIGHT I WIDTH SPACING FULL PER 120 wg. 24" Ellip 5' - 5 13/16" 3' - 0" 10 1/8" 3' - 0" 245 Ibs. LOAD 96 STACK 12 454.2; L 609.6 mm 1671.3mm 911.4 mm 257.2 mm 914.4 mm 111.1 kg. 250 wg- 946.3 !L 31.5" 800.1 Hemi 7' - 2 1/2" T - 7 1/2" 12 3/4" 3' - 6" 472 Ibs. 63 9 mm 2197.1 mm 1104.9 mm 323.9 mm 1066.8 mm 214.1 kg. 320 wg. 3151 Hemi 8' -11 314" 3' - 7 1/2" 12 3/4" 4' - 0 1/4" 588 Ibs. 45 9 1211.2iL 800.1 mm 2736.9 mm 1104.9 mm 323,9 mm 1225.6 mm 266.7 kg. 500 wg. 1892.5 IL 37.42" Hemi 9' -10" 4' -1 7/16' 1 15" 5' - 0" T1524.0 871 Ibs, 30 6 950,5 mm 2997.2 mm 1255.7 mm 381.0 mm mm 395.1 kg 1000 wg. 1 40.96" Hemi 15' -10 13116" 4' - 4 5/16" 16 1/4" 9' - 0" 1729 Ibs. 15 5 3785.0 L 1040.4 mm 4846.6 mm 1344.6 mm- 412.8 mm 2743.2 mm 784.3 kg 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 in a 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 whetherithe locations of the anode/ cathode remain constant overtime. 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. Corrosiop 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 suraface or soil variations such as rocks, salts, fertilizer, moisture concentration, oxygen concentration, etc. �.J jTr 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 - a and should be used in conjunction with the other. An effective external protective coating insulates the steel from the soil environment, thus preventing 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 create tiny defects, which may result in accelerated corrosion at the defect. Cathodic protection prevents corrosion at those defects by applying DC current from an external source, forcing the tarik to become cathode. Application of sufficient DC current to the tank will prevent any corrosion from occurring. The two general types of cathodic protection systems are sacrificial and impressed current. Sacrificial systems are used when the amount of current required for the protection, is small, such as in underground propane tanks. Impressed current systems are more commonly used for large structures such as large diameter Pipelines. Electrical isolation of the tank from metallic piping systems and electrical grounds is critical for the cathodic protection system's effectiveness. How Sacrificial Cathodic Protection Works Sacrificial 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 1.25Vvolts 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 backfill 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 forvarious sizetanks based on conservative design assumptions. This chart covers soil conditions UP to 10,000 ohm -centimeter resistivity. Resistivitles 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 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 rentu»Isclay,r Sand, Gravel, Rocky Sandy.T,Lo mf. ' Areas Tank Cap. 51 5 DD ohms m} . 5000 to 10000 ohm -cm (gat.) Size Q A y Size Qty. Alloy 120 9# '_ _j _ . e.. l� � H 1 �K, 9# 1 H-1 150 9# MR a 90 1 H-1 250 _ HTHC 9# 2 H-1 325 9# 9# 2 H-1 500 1T �a1�E. 9# 2 H-1 1000 # t! 9# 4 H-1 1500 9# 4 H-1 'Based on 90% effective external coating, 2 malft2 current density, and 30- yearAnode life. Anode installation 1. De ermine 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 node 2 anodes 4 anodes i 4.Anodes are shipped in either cardboard boxes or multi -wall paper sacks. Remove outer container and bury the 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 Iodations 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 backfill. 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. Mechanical 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: Insertthe blacktest lead into the Common jack 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 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, 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. Ideal far use as ir first stelae resuletor on any domcon estro size ASME or DOT talner In propengas Pressure to an intermediate p installations requiring up to te ainer ressure of approximately 10 PSIG. G, ,,, now aased'on InIat pressure 2D PSIG higher than the regulator selling and de1(ve v:uu o .' ... V y'yvu salgng and delhrery pressure 2l1% lowerthart the IG hlD . rY MUM 2G% lowar than the regulator - • -,- -- moan reguiavon 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 installations, wh'an used fornna! stage pressure control, moat eith, with NFPA Pamphlet 5B erinao rpdrala integral rallervalva orsaparate reilervalve should be apectired In accordance Maximum flow boned on inletpreseure 20 p91(3 higharihan Iha repulalorselUng and delrvary Araeoure 20% lower than the selling, ideal formeo�qy� pressure of 5 to 20 PSIG down to burner pressure, normally 11"w c. dium commercial Installations, multiple cylinder Installations and normal domestic loads, ®B'iiePiltag Jamfo .mageaa,ae The LV3403BR Back a - s `` • M Unt Regulator le designed to reduce first stags pressure of 5-10 pglG down re burner pressure normally 11„ w c. Designed as a second stage regulator for smaller a 10 requirements up to 450=00o BTU/hr, and are Ideal for homes, moelte homes, and aorta es, Dirderilia 1t>t f®� Ae ions with Row > g1fiion g "Maximum claw based on t7 -.. 4 YUlu Inlet is 1 P51G Inlet and 8 W.C. delivery pressure. Maximum Capacity of PE Pipe in Thousands of BTU per Hour of Liquefied Petroleum Gas with a Gas Pressure of 11.0 in. WC and a Pressure Drop of 0.5 in. WC (based on a 1.52 specific gravity gas) 187 125 99 84 74 67 56 50 45 41 38 35 33 29 26 1073 720 571 484 425 383 325 286 257 235 218 204 192 169 152 1391 934 740 627 551 497 421 370 333 305 283 264 249 219 197 1983 1331 1054 893 786 708 600 528 475 435 403 376 354 311 280 3563 2391 1894 1605 1412 1272 1078 948 854 781 723 676 636• 560 504 4724 3247 2608 2232 1978 1792 1534 1359 1232 1133 1054 989 934 828 750 10063 6755 5351 4535 3989 3592 3044 2678 2411 2207 2044 1910 1797 1581 1424 22 20 18 15 13 12 11 10 9 9 8 8 8 7 7 129 113 102 86 76 68 63 58 54 51 48 46 44 42 40 ® 167 147 132 112 99 89 81 75 70 66 63 60 57 54 52 238 209 188 160 140 126 116 107 100 94 89 85 81 78 75 427 376 338 287 252 227 208 192 180 169 160 152 146 140 134 642 569 516 441 391 354 326 303 285 269 255 244 233 224 216 1207 1061 956 810 712 642 587 544 508 478 453 431 411 394 379 2516BTUh=1CFH Maximum Capacity of PE Pipe in Thousands of BTU per Hour of Liquefied Petroleum Gas with a Gas Pressure of 2.0 psi and a Pressure Drop of 1.0 psi (based on a 1.52 specific gravity gas) 1966 1319 1045 886 779 702 595 523 471 431 399 373 351 309 278 11300 7586 6008 5092 4479 4033 3418 3007 2707 2478 2295 2144 2018 1775 1599 14652 9835 7790 6602 5807 5229 4432 3898 3510 3213 2975 2780 2617 2302 2073 20877 14014 11100 9408 8275 7451 6315 5555 5002 4578 4239 3962 3729 3280 2953 37514 25183 19946 16905 14869 13389 11348 9982 8988 8226 7618 7119 6700 5894 5307 43429 29848 23969 20515 18182 16474 14100 12496 11322 10417 9691 9092 8589 7612 6897 105963 71131 56339 47750 42000 37820 32054 28194 25388 23234 21517 20108 18926 16647 14990 236 207 187 158 139 125 115 106 99 93 88 84 80 77 74 1355 1192 1073 910 800 720 659 611 571 537 508 484 462 443 425 1757 1545 1391 1179 1037 934 855 792 740 696 659 627 599 574 551 2503 2202 1983 1680 1478 1331 1218 1128 1054 992 939 893 853 818 786 4498 3956 3563 3019 2656 2391 2189 2027 1894 1783 1688 1605 1533 1469 1412 5903 5232 4740 4057 3596 3258 2997 2788 2616 2471 2347 2239 2144 2060 1.985 12705 11175 10063 8529 7502 6755 6182 5725 5350 5036 4767 4535 4331 4150 3988 2516BTUh=1CFH Maximum Capacity of PE Pipe in Thousands of BTU per Hour of Liquefied Petroleum Gas with a Gas Pressure of 10.0 psi and a Pressure Drop of 1.0 psi (based on a 1.52 specific gravity gas) 2476 1662 1316 1116 981 884 749 659 593 543 503 470 442 389 350 14234 9555 7568 6414 5642 5080 4306 3787 3410 3121 2890 2701 2542 2236 2014 18455 12388 9812 8316 7315 6587 5583 4910 4422 4047 3747 3502 3296 2899 2611 26296 17652 13981 11849 10423 9385 7954 6997 6300 5766 5340 4990 4697 4131 3720 47252 31720 25123 21293 18729 16865 14294 12572 11321 10361 9595 8967 8440 7423 6685 53960 37087 29782 25489 22591 20469 17519 15527 14068 12943 12041 11297 10671 9458 8569 133476 89601 70967 60148 52905 47640 40376 35514 31980 29267 27104 25329 23840 20970 18882 297 261 235 199 175 158 144 134 125 118 ill 106 101 97 93 1707 1501 1352 1146 1008 907 830 769 719 676 640 609 582 557 536 2213 1946 1753 1485 1306 1176 1077 997 932 877 830 790 754 723 695 3153 2773 2497 2116 1862 1676 1534 1421 1328 1250 1183 1125 1075 1030 990 5665 4983 4487 3803 3345 3012 2757 2553 2386 2246 2126 2022 1931 1851 1779 7334 6500 5890 5041 4468 4048 3724 3465 3251 3071 2916 2782 2664 2560 2466 16004 14077 12676 10743 9449 8509 7787 7212 6739 6343 6005 5712 5455 5227 5024 2516BTUh=1CFH, Ph: 1.800.662.0208 o Fax: 615.325,9407 o Web: www.gastite.com 9