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Home My WebLink AboutREVIEWED BY G SMYTH, Supporting Docs*116 UWXMD P87 aQI EIJM OA8 CODE Table l6,l(n) Pow) Pbmdcpipe.. *S Un4tllwed Qeu l a Peratarot 10.0 pe"A" Dro t 1.0 ------ _ __ PbnNlo Pips Vt bx 8DR Y� ln, 8DR 11 16c. $DR 11 IY� bL OR 11 f ) 9,88(0,660) (0,860 (11W (1,818) Qaft 1,52 1 Yt U. BDR 11 (IJi84) 2 bt. 8DR 11 (1.90 — W LISIt; 81ain He n FLr ,NNW (ow )PAWOAW 80 2140 2890 40 1840 4670 80 1680 60 1470 60 70 1860 2710M1 7140 66M 8870 88910 4000 18420 11480 10180 9220 8480 20800 17800 18400 189M 12800 96400 81200 27600 2600o 28000 80 90 100 126 150 1200 1180 1120 990 897 2680 2870 2240 990 897 46W 4170 4040 8680 8210 7890 140D 6900 6200 8820 I1000 11200 loom 9860 8480 21400 20100 IWO 16W 18200 175 200 226 280 276 826 778 721 681 646 826 778 721 681 646 2080 2780 2600 2460 2840 8170 4810 4510 4260 4050 7800 7260 6810 6480 6110 14000 low 1.2200 11600 11000 -- 800 617 617 2280 8860 58" 10470 �- 660 400 661 528 567 528 2060 1910 8660 8800 6e60 4900 0640 8970 460 1 495 495 992 810D 46" 8410 800 468 468 987 2980 4420 7960� 600 424 424 80 26N 4011) 7200 700 890 890 781 2440 8690 8620 800 $68 868 726 2210 - 8480 6100 u. QOp 1000 1800 R M 140 822 268 221 ~ 840 822 268 01 v - 682 ^- 644 617 1 448 � 2180 2010 988 498 $220 8040 1616 1388 8780 6460 4890 6750 M: Iron Pipe Sim. NAIL• S"dard Dbnowton Itado Note; (1) CapadOes ua in ION Btu/hr. (2) Dimension In 1w nthm are Indde diameter. TRINITY CONTAINERS, LLC UNDERGROUND TANKS OVERALL LENGTH TOP OF LID 8 RELIEF SHROUD VALVE ASSEMBLY b Ir-Y ¢w IiIt LIQUID WITHDRAWAL 10 iSw Ua IS II �I DIAMETER General Specifications Conforms to the last edition and addenda of the ASME, Section Vill, Division 1. Complies with NFPA 58. The 28" Riser tank conforms to specifications set forth by the Railroad Commision of Texas. Rated at 250 psig from -200 F. to 1250 F. All tanks may be be evacuated to a full (14.7 psi) vacuum. Vessel finish: Coated with TGIC red 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 such federal, state, or local regulations. UNDERGROUND VESSEL DIMENSIONAL INFORMATION All vessels dimensions are approximate WATER OUTSIDE HEAD OVERALL OVERALL HEIGHT WEIGHT Riser Height CAPACITY DIAMETER TYPE LENGTH 28" 120 wg. 24" Ellip 5' - 5 7/8" 5'- 0 3/8" 252 lbs. 454.2 L 609.6 mm 1673.2 mm 1533.5mm 114.3 kg. 250 wg. 31.5" Hemi 7' - 2 112" 5'- 7 3/8" 472 lbs. 946.3 L 800.1 mm 2197.1 mm 1711.3 mm 214.1 kg. 320 wg. 31.5" Hemi 8' - 11 3/4" 5'- 7 3/8" 588 lbs. 1211.2 L 800.1 mm 2736.9 mm 1711.3 mm 266.7 kg. 500 wg. 37.42" Hemi 9' - 10" 6' - 1 7/8" 921 lbs. 1892.5 L 950.5 mm 2997.2 mm 1863.7 mm 417.8 k 1000 wg. 40.96" Hemi 15' - 10 7/8" 6' - 5 3/8" 1731 lbs. 3785.0 L 1040.4 mm 4848.2 mm 1965.3mm 785.2 kg 1465 wg. 46.614" Ellip IT- 7 1/4" 6-11 1/16" 2745 lbs. 5545.0 L 1184 mm 5365.8 mm 2109.8 mm 1245 kg 2000 wg. 46.614" Ellip 23' - 9 3/8" 6' - 11 5/16" 3685 lbs. 7570.0 L 1184 mm 7248.5 mm 2065.3 mm 1671.4 kg I umMMOAOUW L.P.O. STORAGE DANK f I TYPICAL ANCHORING STAaOARO t/z' PE nuwc MCL AUGER A CWR GAS olvisl0N I. when oaccia ry to prevent Ilumutdon. or wh=.•Wmkw. und"groutai ' � [talcs shill be anchored using 4 - 'AMP anger anchota and IAA stets cable. Cable d.,,ul tKr Wsaw in Ps tubbw to protm t too Ishk from dkact cbmset with the cable. 2. Locate cable apgaroxitaatclp I4' lttsysld oPwelded seam.gn both ends ar r1 a aril. Ilse 4 (.%j galvanic cofe damps tb secure cable to. Uto atrAor. g_ Refer to Standard 6.6 for tank beetle[. coating &q bsckTU. 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.ctmarn flows from the tank into the soil corrosion occurs. This location is called the anode inacorrosioncircuit. Where current flows from the soiltothe 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 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 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, sails, fertilizer, moisture concentration, oxygen concentration, etc. Preventing Corrosion Protecting underground tanks from corrosion is easily achieved bytheuse oftwo commonly applied protection methods: external coaling and cathodic protection. These two methods are complementary 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 currentfrom the anode to the cathode. An effective external coaling canpmtectover99a/a of thetanksurfacearea. However, no coaling 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 tank to become cathode. Application atsuffidentDCcurrent tothe tankwiliprevent 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 sled is about -0.50 volts referenced to a copper sulfate electrode. The open circuit potential of magnesium is about -1.eeV 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 calls 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 990/6 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 Ih. and 171b. The size designation relates to the metal weight. 10' of #12 TIN insulated wire is attached to the anodes. Anodes are then baclddlel in a mixture of gypsum, bentorlde, 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 backtiil is then packaged in a cotton bag and either a cardboard box or paper bag. Actual shipping weight of these anodes with backfifl is 27 lb. and 45 it. 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. Resistivfies 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 coaling 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 fine 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. Copperandsted creste 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 Typo ,,ply Sand, Gravel, Rocky Areas Tank Cap. 5000 to 10090 ohm-em ". Size aY. Alloy 120 _ x` 9# 1 H-h 150 ` 98 i H-1 250 ._ 9f 2 H-1 325 ti W 2 H-1 500 91 2 H-1 1000`+ 9# 4 H-1 1500 _ 9# 4 H-1 2000 94 6 H-1 'Based on 90% effective external coating, 2 ma4Z2 current density, and 30- ye3rAnode life. Anode Installation 1. Determine size and quantity of anodes from application chart. 2. When a single anode is 'installed, d 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 2anodes 4anodes -D11 4-Anodes are shipped in either cardboard boxes or mufti -wail 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 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 backfiil. Water is necessary to activate the anode. B.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 muitivalve. A good solid connection is very important. (DO NOT connect to shroud). STEP 2:1nsertthe black test lead into the Common jack on the meter, and connect the opposite and of the lead to a charged reference electrode (1h cell). STEP 3: Remove protective rap 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 Yi 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 tie tube. DO NOT USE TAP WATER. STEP2: Replace porous plug end of efectrodeand 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. Cautlerr. Do not allow electrode to contact nil, road salts, or other substances that may contaminate the solution by absorption through porous plog. Do not allow electrode to freeze. Distributed By: IM11- o