REMOVAL_1986 - Laserfiche WebLink

Home Browse Search

■)(ONCOMPANY, US.A, xawtla,agaaowawwp„ MARKETING .. ENGINEERING giwsae b/15/82 STA D UNDERGROUND I" ni-4-A3 AANpgMEN ' 11A4AoATII12/1 1 .0 SCOPE This engineering standard provides operating procedures which may be used fill opening. The entire area of operation should therefore be Con- (8) If the method described in (A) is not practic- 5. In an of the foregoing cases where all tank to for the abandonment, removal , storage, placing temporarily out Of service Sidered hazardous and all necessary precautions should be taken able, the vapors in the tank may be made inert Y 9 9 openings are plug and sale of used underground tanks which have Contained gasoline or other to prevent ignition. be tightly pluggged, screwed plugs should be used, and one plug flammable liquids. Whereas this guide refers to service station features, by adding solid carbon dioxide (dry ice) in the ' should have a 1/4" vent hole ss prevent the tank from being the principles outlined may be applied to 'tanks used in other functions. 3. Di down to expose the top of the tank for its entire length. amount y. 1 .5 pounds per 100 gallons he tank subjected to an excessive pressure differential Caused by critical ,Listed below .are other available references which will provide additional g D 9 capacity. The dry ice should ea crushed and temperature changes. distributed evenly over the greatest possible guidance. I I4. Remove the fill tube, both external and internal if so equipped• area to secure rapid evaporation. Avoid skin 6. The former contents and present vapor state of each tank, if NFPA No. 30: Flammable g product as possible.Liquids Code 5. Remove as much of the floating contact with dry ice because it may produce known, or the gas-freeing treatment and date should be indicated . burns. As the dry ice vaporizes, flammable by an appropriate label on the tank. : NFPA No. 327: Standard Procedure for Cleaningor vapors will flow out of the tank and may 6. Disconnect, empty and cap vent line and all product lines. Remove surround the area. Hence, observe all normal 2.3.2 Sell in Place Safeguarding Small Tanks and Containers submerged turbine pumps, if so equipped, and all bungs. Use Particular safety precautions regarding flammable vapors. care in emptying lines to avoid spilling product into the excavation. Make sure that all of t e dr ice has vaporized. NFPA No. 329: Underground Leakage of Flammable and b Y p Use a bill of sale to transfer tank ownership and by which purchaser Combustible Liquids 7. Continue filling with water intermittently as necessary to remove (C) An alternate method is to ventilate the tank with will illackof s a and assume all liability related to the tank. r g Published b the National Fire Protection Association, 470 Atlantic any remaining product for placement in a container. If dry ice air, using a small gas exhauster operated with The bill of sale must show: „+ ( Y is used, add a sufficient amount to show visible exhaust at all compressed air (from the service station or from 1. That the property owner has been Informed of the former use Avenue,.. Boston, MA 02210), openings. a portable compressor) or by other suitable means. and present condition of the tank. p•: . API Bulletin 1604, Recommended Practice for Abandonment or Removal B. After water has overflowed the tank or the tank has been inerted The flow of air in through an opening near one end of the tank and the discharge of the vapor-air 2. The manner of gas freeing, if any, and whether filled with water. is of Used. Underground Service Station .Tanks with dry ice, check the space in the hole above and around the tank mixture out of an opening near the opposite end will ` with a vapor tester. If the readings are below 20% of the lower API Publication 2013, CleaningMobile in Flammable Combustible g _ quickly remove the vapor. The vapor concentration 3. That the tank must not be used for the subsequent storage of explosive limit (LEL), proceed with Step 9. If not, ventilate until in the tank can be checked with a combustible gas food or liquids intended for animal or human consumption and :r Liquid Service' - the level is below 20%. . indicator to determine when the tank is gas-free. should be stenciled accordingly. While the tank is being ventilated, flammable vapor API Publication 2015, Cleaning Petroleum Storage Tanks 9. Cut a hole of six to ten square feet in the tank top with blows may flow into the surrounding atmosphere. Ignition 2.3.3 outlines additional requirements if the tank is to be junked. , . API Publication 2015A A Guide for. Controllin the Leak Hazard from a backhoe or, other convenient method. If water has been used,. sources should be eliminated from the immediate 9 pump out and dispose of according to local regulations. If dry vicinity. 2.3.3 Junking Associated with Tank Entry g Y Ice has been used, remove all petroleum product from the low end 't of the tank. 7. After the tank has been freed of vapors and before the tank is moved If the tank shell is corroded with pits more than 1/16 inch in depth API Publication 2202, Dismantling andDisposingof Steel from Tanks from the site, plug or cap all holes. Use screwed (boiler) plugs or shows signs of rough handling ( i .e. dents, gouges), used steel v, Which Have Contained Leaded Gasoline10. Introduce a suitable, solid, inert material through the hole in to plug any corrosion leak holes. One plug should have a 1/8-inch tanks are not to be reused for the Storage of flammable liquids I " the top of the tank. vent hole to prevent the tank from being subjected to an excessive and are considered junk that should be disposed of. Whether sold i,„ - Care required not only in the handling and use of flammable liquids buts pressure differential caused by extreme temperature changes. to a junk or scrap dealer or discarded at an acceptable facility, also in abandoning,, moving, or storing of tanks which have held flammable a) Sand Fill . Sand will flow readily and is generally available. sufficient holes should be made in tanks re render them unfit for liquids., This i5 frequently used trufor he .underground tankmotor fuel service stations nA y kind-of sand he suitable if free Of rocks which might limit 8. finally, the tank should he secured on a truck for transportation _ further use as a storage vessel . To ensure proper disposal, the which are most frequently used far the storage of motor fuel and for the leveling-out in the tank. to the disposal site. The tank should be secured so that the following should be incorporated into the scope of work and written storage of other flammable or combustible liquids. 1/8-inch vent hole is located at the uppermost point on the tank. agreement with the party taking possession of the tanks. c The sand may be introduced dry as long as it flows in freely If a tank remains at the site overnight, or longer, additional 2.0 DISPOSITION and when the Cone nears tank top, can be washed into the tank a � 'x. `." t f water and addled to cause it he flow vapor may be released from liquid held in the scale or sediment in 1. When a tank is gas free, it should be punctured in a random d with a nominal amount op the tank . Consequent) tanks should be removed from the premises manner with a pickaxe, chisel, or other heavy, Shan object; 2.L> Temporarily Out of Service to the ends. Excess water shogld be avoided as the tank might as promptly as possible after these procedures have been completed. or man large oles may be drilled into It, There should be be filled with water before. it is filled with sand. P p Y P P Y 9 Y �� a minimum of two one inchdiameter holes per quarter section of are idle but will be returned to service or are awaiting abandonment The entire area of operation should be considered hazardous 2.3.1 Storage of Used Tanks the tank. When a tank is not gas-free, it should be filled Underground tanks are considered "temporarily out of service If they.. in lace or removal. Such tanks will be considered safe for the y precautions taken to prevent ignition. with water until overflowing and punctured, as above, while full p and all 9 Used steel tanks should not be stored and should be sold or of water. Fy, at temporary ' period if they are treated as provided in this section. Junked as described in 2.3.3. Used fiberglass tanks should riffs 1 . Pump out flammable liquid. It is desirable to leavea minimum be stored as described below. 2. As an added precaution, regardless of condition, the tank should 0 of be labeled adjacent to the fill opening in legible letters with learn of 4inches of to ensure a rich non-explosive vapor mix- b) Sand and Earth Fill . Almost complete filling can be achieved Even if used tanks that have contained flammable liquids the following information: gCoo ` ;, turein the tank. y using a combination of sand and earth az follows : have been suitably gas-freed at one time, they cannot be 1 ) Fill the tank with sand to approximate) 80 percent of guaranteed to remain gas-free because le the retention of "Tank Has Contained Flammable Liquids ext+ :• ( calculated capacity. Y P hydrocarbons in crevices and under scale. It is important, Not Gas-Free P Y• therefore, that they always be handled with due precaution. Not Suitable for Food or Drinking Writer 2, 'Cap thefill pipe and gauge pipe and secure against tampering. Cap the product lines at the service station Island or elsewhere (2) Mix soil and water to make a free-flowing mud. Pour into The following NOTE: Prior to junking- g procedure is recommended for storing fiberglass j g gasoline tanks the latest if the pumps are removed. . The pumps may remain connected if they tank opening and puddle until Lank is full and overflows tanks: 9 g applicable waste disposal regulations should are locked and the electric power to them is turned off. the opening cut in the tank . be checked to determine if special attention 1 . Such tanks should be stored and secured by chocking where or preparation is required. {: 3. 'Leave the vent line open. When under round tanks are abandoned in lace, the owner of the tank I . t+ 4 P they can be safeguarded, usually on the locked premises .,, should keep a permanent record of the tank location, date and method of a tank user familiar with the hazards, or at another 2.4 Abandoning Steel Tanks Adjacent to Fiberglass Tanks R Note: The above procedure is not intended to apply to tanks containing. of conditioning the tank for abandonment. Subsequent property owners location where the amara) Srrr. special fuels or to large Installations as at airports.s. g public will not have access. yy n P 9 p should be informed of the presence of abandoned underground tanks and An open, fenced yard area, apart from other facilities, If a tank adjacent to a fiberglass tank is t0 be abandoned, it is particularly an acknowledgement or a release obtained from the property owner . is desirable. important to abandon it in place to avoid damage to the fiberglass tanks 2.2 Abandonment in Place due to loss of lateral support. Improper abandonment or removal would 2.3 Removal of .Underground Tanksprobably cause a failure in the fiberglass tank due to settlement. A :determination of whether to abandon a tank in place or to remove it 2, Before staring tanks, it is desirable to have them gas-freed IFf oY„ ; will depend upon the..location, .labor, materials, local regulations, The safe removal of underground tanks can be accomplished by taking by flooding with water or dry ice or mechanical ventilation. Ju,?. and equipmentavallableand their prices. The age of service, possible the following steps: If such facilities for gas-freeing are unavailable, tanks reuse, and salvage .value are all factors to consider. The federal may be overflowed with water to expel vapors and then drained. "Solid Waste Disposal Act" places restrictions on. disposal of hazardous 1 . Drain and flush the piping into the tank . Observe all normal safety and pollution precautions regardinr materials such as tanks that have been in leaded gasoline service, flammable liquids and vapors . 2. . Remove all flammable liquid from the which can be q pumped out. Tanks will become gas-free by natural ventilation if stored off ;. This standard provides a Safe method for the abandoning of underground i It may be necessary to use a hand pump to remove the bottom few the ground with all openings down and open for a protracted period. tanks inlace. ranches of product. P . - During this period of natural breathing caused by temperature ' change, the vapors may be within their flammable limits. To assure 3. Dig down to the top of the tank. safe operations, the condition of the tanks should be indicated s• + Tanks may be effectively and safely abandoned underground by taking 4. Remove the fill (drop) tube. Disconnect the fill , gauge, product, by a label or sign and they should be protected from unauthorized the following steps in the sequence shown: and vent lines. Cap or plug open ends of lines which are not to personnel during this period. be used further. 1. Remove all flammable liquid which can be pumped out. It may be neces- ' 3. Any of these operations may release scale or sludge from "r - sary to ,use a hand pump to remove the bottom few inches of product. 5. Temporarily plug all tank openings, . complete the excavation, and tanks which have contained leaded gasoline. Such scale remove the tank, placing it in a secure location. Block the tank or sludge must be handled with extreme caution and must 2. Fill tank with water to 6 inches from the top to expel vapors. As the to prevent movement. Before undertaking degassing mesures, it is be disposed of consistent with requirements of the Solid -�� Waste Disposal Act and local or state level of the liquid rises, any remaining product will float on top. of normally, necessary to remove the tank from the ground since product P requirements. °r water. ,. which may have previously leaked into the ground could reenter the 4. Gas-free tanks may be safely stored with unplugged openings, ( In some locations water may not be available, its use may be impract- tank. Extreme caution should be used during this procedure. however, plugging all openings (one plug must have 1/4" vent ical because of low temperatures, pollution control restrictions, 6. Remove flammable vapors. The tank should be conditioned by one of hole) is recommended to keep tank interiors clean . or forother reasons. In such instances the vapor space in the the methods described in (A) through (C) , or as required by local tank may be made inert by adding solid carbon dioxide (dry ice) codes, to ensure that no flammable vapors remain. in the amount of 1.5 lbs per 100 gallons tank capacity, The dry ice should be crushed and distributed over the greatest possible (A) If water is available and there is a suitable means k area to aid evaporation. This can be facilitated by 9 the removing for disposal , the tank may be filled with water to " th an internal) mounted fill tube, ^. 1 slip tube or 'if equipped" wi x 1 i til s P . Y expel vapors. While the .tank is being filled with , by digging dawn to and removing a tank bung. . Avoid skin contact water, flammable vapors will flow outofthe tank with dry 1ce, as it will produce frost bite.) and may surround the area. Purged product may flow s- out of the tank if it overflows. Hence, observe In the process of water-filling the tank, flammable vapors will be all normal safety and pollution precautions regarding expelled throughboth the vent and fill openings, but primarily at the flammable liquids and vapors . When the tank is to be removed from the premises, the contaminated water a should be removed and disposed of in accordance with N .zs DATE REVISIONS BY CHK PROJECT NO. EON COMPANY, U.S.A. •oiwawofexxa+convonxnow 'Z S ,gr. Marketing Department Distribution FILE NO. DATE TANKAGE MODIFICATION PROJECT ;•. s - DRAWN BY _' /+/J RAS NO. CHK BY UNDERGROUND TANK ABANDONMENT DWG. NO. C SCALE - REMOVAL SPECIFICATION G/✓/005