NR 812.17(2)(c)5. 5. Pipe with coatings containing contaminants on the inside of the pipe.
NR 812.17(2)(c)6. 6. Pipe with heavy coatings of paint on the outside of the pipe.
NR 812.17(2)(d) (d) Marking requirements. Each length of well casing pipe 2 inches or larger in diameter shall meet the requirements in Table V and shall be legibly marked in conformance with the ASTM or API marking specifications including color identification in the form of bands. Except where identified in this subdivision, each length of pipe shall show the manufacturer's name or trademark; ASTM marking or API monogram, specification number and grade; diameter in inches; wall thickness or weight in pounds per foot; whether seamless or welded and type of weld. Specific well casing pipe marking requirements are as follows:
NR 812.17(2)(d)1. 1. ASTM A 53: manufacturer's name or mark; ASTM designation, specification number and grade;process of manufacture, continuous welded (type F), electric-resistance—welded A, electric-resistance—welded B, seamless, or seamless B, XS for extra strong, XXS for double extra strong.
NR 812.17(2)(d)2. 2. ASTM A 106: manufacturer's name or mark; ASTM designation and specification number; schedule number; hydrostatic test pressure when tested, the letters “NH" when not tested;symbol “S" if the section of pipe conforms to the supplementary requirements for chemical composition, transverse tension and flattening tests and metal structure and etching tests;weight of pipe if pipe is greater than 4 inches in diameter.
NR 812.17(2)(d)3. 3. ASTM A 589: manufacturer's name or mark; ASTM designation, specification number and grade; wall thickness; nominal or outside diameter; process of manufacture, butt-welded, electric-resistance—welded, or seamless; grade, for Type I—Drive Pipe;type number, Type I—Drive Pipe, Type II—Water-Well Reamed and Drifted Pipe, Type III—Driven Well Pipe.
NR 812.17(2)(d)4. 4. API 5A, API 5AX, API 5L and API 5LX: manufacturer's name or mark; API monogram and specification; size, outside diameter; weight per foot; grade of pipe; process of manufacture, S for seamless, E for electric weld, and F for butt weld pipe; hydrostatic test pressure.
NR 812.17(2)(d)5. 5. API 5D: manufacturer's name or mark; API specification; Compatible standards; Unfinished pipe (UF), if plain-end; Size and weight designation; Grade.
NR 812.17(2)(d)6. 6. API 5L: manufacturer's name or mark; API specification; Compatible standards; Size and weight designation; Grade; Process of manufacture, S for seamless, E for electric weld, F for continuous-weld pipe; Heat treatment symbol; Hydrostatic test pressure, if higher than standard pressure.
NR 812.17(2)(d)7. 7. API 5CT: manufacturer's name or mark; API specification; Compatible Standards; Unfinished pipe (UF), if plain-end; Size and weight designation; Grade; Process of manufacture; Test pressure; Type of thread (if used); Heat treatment.
NR 812.17 Note Note: The listed ASTM and API specifications are available for inspection at the offices of the department of natural resources, the secretary of state, and the legislative reference bureau and may be obtained for personal use from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103 and the American Petroleum Institute, Publication and Distribution Section, 1220 L Street, Northwest, Washington, D.C. 20005.
NR 812.17(2)(e) (e) Assembly and installation. When steel well casing pipe is driven or installed it shall be accomplished in a manner such that injury to the well casing pipe does not result which may affect the quality of the water supply. Steel well casing pipe shall be assembled watertight by correctly mated, recessed type couplings having the weights and diameters as listed in Table V or by means of joints welded in accordance with the specifications in the American Welding Society manual, AWS D10.12-89, “Recommended Practices and Procedures for Welding Low Carbon Steel Pipe." No other means of assembly may be used without approval. Steel well casing pipe to be assembled with welded joints shall have beveled ends. The weld shall fill the bevel. The department recommends that a minimum of 2 welding passes be made for any pipe having a diameter larger than 7 inch outside diameter.
NR 812.17(3) (3)Thermoplastic well casing pipe.
NR 812.17(3)(a)(a) Pipe and material specifications:
NR 812.17(3)(a)1.1. Thermoplastic well casing pipe and couplings shall be new polyvinyl chloride (PVC) or acrylonitrile-butadiene-styrene (ABS) material produced to and meeting the ASTM F 480 standard and shall have a standard dimension ratio (SDR) of 21, 17 or 13.5. Styrene-rubber thermoplastic well casing pipe, including ASTM F 480 may not be used.
NR 812.17(3)(a)2. 2. The nominal well casing pipe diameter shall be at least 4 inches.
NR 812.17(3)(a)3. 3. The thermoplastic well casing pipe, pipe couplings, cement, primer and other components used shall be approved for well casing pipe in potable water supplies by the NSF Standard Number 14 as it relates to well casing pipe, or an approved equivalent organization. Approval of alternate organizations shall be based on demonstration of unbiased and appropriate testing methods at least as stringent as NSF methods.
NR 812.17(3)(a)4. 4. The well and heat exchange drillhole casing pipe shall be marked in accordance with the ASTM F 480 specification and this section. The pipe shall be marked at least every 5 feet showing the nominal size; standard dimension ratio or schedule number; type of material; the wording — “well casing" — followed by impact classification; designation “ASTM F 480" including year of issue of the standard with which the well casing pipe complies; manufacturer's name or trademark; manufacturer's code for resin manufacture, lot number and date of manufacture; and the NSF-WC designation or other approved laboratory's seal or mark.
NR 812.17(3)(a)5. 5. Prior to use the thermoplastic well casing pipe shall be inspected for defects. Pipe with defects shall not be used for permanent well casing pipe.
NR 812.17(3)(a)6. 6. The thermoplastic pipe shall be assembled with either flush-threaded joints, integral-bell, solvent-cemented joints or one-piece solvent cemented couplings in a manner according to the specifications in ASTM F 480. A permanent tag bearing the message“plastic well casing" shall be attached to the top of the well casing pipe, the full pitless unit, or the riser pipe extending up from a short-model pitless unit.
NR 812.17(3)(a)7. 7. When thermoplastic well casing pipe is extended above the depth of the buried pump discharge pipe, the thermoplastic pipe shall be contained in a pump house or in a oversized steel pipe extending to the top of the thermoplastic pipe.
NR 812.17(3)(a)8. 8. The listed ASTM and NSF standards are available for inspection at the offices of the department of natural resources, the secretary of state and the legislative reference bureau, and may be obtained for personal use from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103 and from the National Sanitation Foundation Testing Laboratories, Inc.; P.O. Box 1468, Ann Arbor, MI 48106.
NR 812.17 Note Note: The requirements for the installation of pitless adapters, pitless units or above-ground discharges for wells constructed with thermoplastic well casing pipe are in s. NR 812.31 (4).
NR 812.17 History History: Cr. Register, January, 1991, No. 465, eff. 2-1-91; am. (1) (a) and (b), (2) (a), (b), (c) (intro.) and 3., (3) (a) 1. and 6., cr. (1) (c), (2) (c) 6. and (d) 5. to 7., renum. (2) (d) 1. a. to d. and (f) to be (2) (d) 1. to 4. and (e) and am. (2) (d) 1. and 3., r. (2) (d) 2., Register, September, 1994, No. 465, eff. 10-1-94; correction in (3) (a) 8. made under s. 13.92 (4) (b) 6., Stats., Register July 2010 No. 655; CR 13-096: am. (title), (1), (2) (b), (c) (intro.), (3) (a) 4. Register September 2014 No. 705, eff. 10-1-14. - See PDF for table PDF
NR 812.18 NR 812.18Welding procedures.
NR 812.18(1) (1) Welding procedures for plain end well casing pipe shall be made watertight in accordance with the specifications in the American Welding Society manual, AWS D10.12-89, “Recommended Practices and Procedures for Welding Low Carbon Steel Pipe". Well casing pipe to be welded shall conform to the specifications of s. NR 812.17 (2). Welding procedures for pitless adapter connections to well casing pipe shall be made watertight in accordance with welding procedures in the AWS Structural Welding Code, AWS D1.1.
NR 812.18(2) (2) The referenced AWS manuals are incorporated by reference. They are available for inspection at the department, the legislative reference bureau and the secretary of state's office and may be obtained for personal use from the American Welding Society, P.O. Box 351040, Miami, Florida 33135.
NR 812.18(3) (3) Fusion welding connection for vertical heat exchange piping shall be done using socket fusion, saddle fusion or butt fusion type, in accordance with pipe manufacturer's instructions or as referenced in ASTM D 2610, D 2683 and D2657. Joint surfaces shall be clean and moisture free.
NR 812.18 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91; correction made under s. 13.92 (4) (b) 6., Stats., Register July 2010 No. 655; CR 13-096: cr. (3) Register September 2014 No. 705, eff. 10-1-14; correction in numbering (1), (2) made under s. 13.92 (4) (b) 1., Stats., Register September 2014.
NR 812.19 NR 812.19Well plumbness and alignment. Well drillers and well constructors shall construct drilled wells to comply with the well plumbness and alignment requirements to the depth to which the permanent pump will be set plus 25% of that depth. When a well is less than 100 feet deep, the allowable deviation from plumb of the well centerline shall be proportional to wells 100 feet deep.
NR 812.19(1) (1)Plumbness. The plumbness requirements apply only to wells with 10-inch diameter and larger well casing pipe. The deviation per 100 feet of well depth from plumb of the center line of the well may not exceed 75% of the well diameter.
NR 812.19(2) (2)Alignment.
NR 812.19(2)(a)(a) Wells shall allow the free passage of the pump to be permanently installed in the well to the depth of pump setting plus 25% of that depth.
NR 812.19(2)(b) (b) Wells with bends which prevent setting a lineshaft turbine pump to the desired pump or pump bowls setting, plus 25% of that depth, such that bending of the pump bowls or pump column causes damage to the bearings, will not be accepted by the department unless accepted by the owner of the well.
NR 812.19 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91.
NR 812.20 NR 812.20Grouting and sealing.
NR 812.20(1) (1)Grouting and sealing materials.
NR 812.20(1)(a)(a) Neat cement grout. Neat cement grout shall consist of a mixture of cement and water in the proportion of one bag of Portland cement, 94 pounds, ASTM C 150, Type I or API-10A, Class A; and 5 to 6 gallons of clean water from a known safe and uncontaminated source. Powdered bentonite may be added up to a ratio of 5 pounds per 94-pound bag of cement. Ingredients, to increase fluidity, control shrinkage or time of set may be used only with approval. Neat cement grout shall be used to seal the annular space:
NR 812.20(1)(a)1. 1. Of low capacity wells when the upper enlarged drillhole is constructed more than 5 feet into a bedrock formation,
NR 812.20(1)(a)2. 2. Of low capacity bedrock wells when bedrock is encountered within 40 feet of the ground surface or within 30 feet of the ground surface if the bedrock is sandstone,
NR 812.20(1)(a)3. 3. Of potable high capacity wells,
NR 812.20(1)(a)4. 4. Of school wells,
NR 812.20(1)(a)5. 5. Of wastewater treatment plant wells,
NR 812.20(1)(a)6. 6. When a liner pipe is installed for the purpose of preventing water containing contaminants with levels exceeding the drinking water standards of s. NR 812.06 from entering the well.
NR 812.20(1)(a)7. 7. Of heat exchange drillholes if potable water or an approved fluid is continuously circulated in the loop pipe until heat of hydration subsides to a safe level below the temperature of potential loop pipe deformation.
NR 812.20(1)(b) (b) Concrete (sand-cement) grout. Concrete (sand-cement) grout shall consist of a mixture of cement, sand and water in the proportion of one bag of Portland cement, 94 pounds, ASTM C 150, Type I or API-10A, Class A; a cubic foot of dry sand and 5 to 6 gallons of clean water from a known safe and uncontaminated source. The sand shall meet the specifications for use in Portland cement concrete. Concrete (sand-cement) grout shall be placed with a conductor (tremie) pipe. Approval is required for the use of concrete grout. Approval for the use of concrete grout may be granted when an excessive loss of circulation in grouting with neat cement grout occurs.
NR 812.20(1)(c) (c) Sodium bentonite water slurry (drilling mud and cuttings). Sodium bentonite water slurry (drilling mud and cuttings). A sodium bentonite water slurry (drilling mud and cuttings) may be used as sealing material in unconsolidated formation wells or bedrock wells, provided depth to a bedrock formation or other well construction requirements in Tables I to IV do not specify the use of neat cement grout and the well is not a potable high capacity, school or wastewater treatment plant well. A mud weight of at least 11 pounds per gallon is required. Normal drilling mud circulated during the construction of wells may not meet this requirement for sealing unless additional drill cuttings are added to the slurry. Sodium bentonite water slurry (drilling mud and cuttings) is not allowed for grouting of heat exchange drillholes.
NR 812.20(1)(d) (d) Clay slurry. Clay slurry is a fluid mixture of water, clean native or approved commercial clay; and drill cuttings. Clay slurry may be used as an annular space sealing material for low capacity wells constructed with percussion methods, except for bedrock wells where the upper enlarged drillhole extends more than 5 feet into the bedrock or when the bedrock is encountered at a depth of less than 40 feet, 30 feet for sandstones and except for school and wastewater treatment plant wells. The clay slurry shall have a mud weight of at least 11 pounds per gallon. Clay slurry is not allowed for grouting of heat exchange drillholes.
NR 812.20(1)(e) (e) Sodium bentonite. A sodium bentonite grout may be used as a sealing material for heat exchange drillholes, if a minimum of a 20 percent solids mixture is maintained as per manufacturer specifications.
NR 812.20(1)(f) (f) Sodium bentonite (bentonite-sand) grout. Sodium bentonite grout may be mixed with clean silica sand up to a ratio of a 5 to 1 mixture of silica sand to bentonite grout, for grouting heat exchange drillholes. Higher mix ratios must receive prior approval from the department before being used. Clean silica sand shall consist of silica sand with 80 percent or more of the sand smaller than 0.0117 inch (passing U.S. Sieve #50) in size.
NR 812.20(1)(g) (g) Cement (cement-bentonite) grout. A cement (cement-bentonite) premix product may be used as a sealing material for heat exchange drillholes if it is approved by the department before being used. Drillers shall not mix their own ratio.
NR 812.20(1)(h) (h) Carbon (carbon-bentonite) grout. A carbon-bentonite premix product may be used as a sealing material for heat exchange drillholes if it is approved by the department before being used. Drillers shall not mix their own ratio.
NR 812.20(2) (2)Cement grouting procedure requirements. The approved cement grouting procedure is as follows:
NR 812.20(2)(a) (a) Neat cement grout shall be placed from the bottom of the open annular space up to the ground surface using one of the methods described in sub. (3).
NR 812.20(2)(b) (b) Conductor (tremie) pipe used for cement grouting shall be any of the following:
NR 812.20(2)(b)1. 1. Metal pipe,
NR 812.20(2)(b)2. 2. Rubber-covered hose reinforced with braided fiber or steel and rated for at least 300 psi, or
NR 812.20(2)(b)3. 3. Thermoplastic pipe rated for at least 100 psi including:
NR 812.20(2)(b)3.a. a. Polyvinyl chloride (PVC),
NR 812.20(2)(b)3.b. b. Chlorinated polyvinyl chloride (CPVC),
NR 812.20(2)(b)3.c. c. Polyethylene (PE),
NR 812.20(2)(b)3.d. d. Polybutylene (PB), and
NR 812.20(2)(b)3.e. e. Acrylonitrile butadiene styrene (ABS).
NR 812.20(2)(c) (c) The grout shall be placed in one continuous operation, if possible. It is the well or heat exchange driller's or well constructor's responsibility to ensure that all necessary materials are on the job site. If unforeseen circumstances prevent completing the cement grouting work in one continuous operation, the well or heat exchange driller or well constructor shall report the non-continuous grouting operation and the reason for it on the construction report for the well.
NR 812.20(2)(d) (d) When a conductor (tremie) pipe is used, the bottom end shall be kept submerged in the grout throughout the grouting process.
NR 812.20(2)(e) (e) The grout shall be brought up to the ground surface. The density of the grout flowing from the annular space at the ground surface shall be the same as the density of the grout being placed. Any settling of the grout more than 6 feet below the ground surface shall be made up. The well driller or well constructor shall add grout until it comes back up to the ground surface.
NR 812.20(2)(f) (f) When temporary outer casing is used to construct the upper enlarged drillhole an attempt shall be made to remove the temporary outer casing during or after the grouting process. If possible, it shall be removed. The grout level shall be retained above the bottom of the casing during removal of the casing.
NR 812.20(2)(g) (g) When an upper enlarged drillhole has been constructed to accommodate the setting and removal of temporary outer casing, the annular space between the temporary outer casing and the well casing pipe shall be grouted before the temporary outer casing is pulled. After the grout between the temporary outer casing and the well casing pipe flows at the ground surface the annular space outside the temporary outer casing shall be grouted by placing a tremie pipe to the bottom of the outer annular space. The grout shall flow at the ground surface before the temporary outer casing is pulled.
NR 812.20(2)(h) (h) The well driller or well constructor shall allow the grout to set for at least 12 hours before commencing further well construction.
NR 812.20(2)(i) (i) Prior approval is required for the use of the “Halliburton" grouting methods and the “grout displacement" grouting method when the upper enlarged drillhole is more than 200 feet deep or when drilling mud or bentonite slurry has not been circulated up to the ground surface in the annular space prior to grouting.
NR 812.20(2)(j) (j) The “conductor (tremie) pipe-gravity" method is not an approved pressure method of grouting. All other methods described in sub. (3) are approved pressure methods for cement grouting and sealing and shall be used when neat cement grout is required to seal the annular space when the upper enlarged drill- hole is less than 4 inches larger in diameter than the nominal diameter of the well casing pipe or when the upper enlarged or heat exchange drillhole extends greater than 25 feet deep or when the heat exchange drillhole is less than 25 feet deep.
NR 812.20(3) (3)Cement grout placement methods. This subsection describes approved cement grout placement methods.
NR 812.20(3)(a) (a) Conductor (tremie) pipe-gravity. As depicted in figure 11, grout material may flow by gravity through a funnel or hopper connected to a conductor pipe. The conductor (tremie) pipe shall be lowered to the bottom of the annular space to be grouted and the grout material placed from the bottom up. The end of the conductor pipe shall be kept submerged in the grout at all times. This method may be used only when the upper enlarged drillhole is at least 4 inches larger in diameter than the nominal diameter of the well casing pipe and is less than 100 feet deep or when the heat exchange drillhole is less than 25 feet deep. The grout shall flow at the surface with the same consistency as the grout entering the well.
NR 812.20(3)(b) (b) Conductor (tremie) pipe-pumped. As depicted in figure 12, the grout material shall be placed by a pump through a conductor pipe into the annular space between the well casing pipe and the upper enlarged drillhole wall or inside surface of the temporary outer casing or a heat exchange drillhole. The minimum diameter of the upper enlarged drillhole shall be as specified in Tables I to IV. The conductor pipe shall be lowered to the bottom of the annular space to be grouted and the grout material shall be pumped from the bottom up. The end of the conductor pipe shall be kept submerged in the grout at all times and the conductor pipe shall be maintained full of grout. The grout shall flow at the surface with the same consistency as the grout entering the well.
NR 812.20(3)(c) (c) Grout (float) shoe-continuous injection. As depicted in figure 13, the bottom of the well casing pipe shall be fitted with a grout (float) shoe equipped with a back pressure (check) valve. A conductor pipe or drill stem shall be connected to the grout shoe and shall extend up through the well casing pipe to a grout pump at the ground surface. The well casing pipe shall be suspended a short distance above the bottom of the upper enlarged drillhole. Grout material shall be pumped through the conductor pipe and the grout shoe until the entire annular space is filled with grout. The conductor pipe or drill stem shall then be removed. The well casing pipe shall be set to the bottom of the upper enlarged drillhole. The grout material shall be allowed to set for at least 12 hours. Once set, the grout shoe and back pressure valve may be drilled out and the well construction continued.
NR 812.20(3)(d) (d) Well seal/tremie pipe-pumped (Braden-head method). As depicted in figure 14, the well casing pipe shall be suspended a short distance above the bottom of the upper enlarged drillhole. The well casing pipe and annulus shall be filled with water, drilling mud or bentonite slurry. A conductor (tremie) pipe shall be set inside the well casing pipe to the bottom and shall extend watertight through a sanitary well seal installed securely in the top of the well casing pipe. A packer may be installed inside the well casing pipe, at depth, as an alternative to using a well seal at the top. The grout shall be pumped down the conductor pipe and up the annular space. The grout shall flow at the surface with the same consistency as the grout entering the top of the conductor pipe. Immediately following grout flow at the surface, the well casing pipe shall be set to the bottom of the upper enlarged drillhole of an unconsolidated formation well or driven to a firm seat in a bedrock well.
NR 812.20(3)(e) (e) Halliburton (double plug) method. This method may only be used when the upper enlarged drillhole is less than or equal to 200 feet deep or when drilling mud or bentonite slurry has been circulated in the upper enlarged drillhole from the bottom up to the ground surface prior to grouting. The grout shall be placed as follows: As depicted in figure 15, the well casing pipe casing shall be suspended a short distance above the bottom of the upper enlarged drillhole. A drillable spacer plug shall be inserted into the well casing pipe and the top of the well casing pipe sealed watertight. A measured volume of grout, calculated to be of adequate quantity to seal the annular space, and to fill the bottom 10 to 15 feet of well casing pipe shall be pumped into the well casing pipe through a small diameter pipe extending watertight through the well seal. The well casing pipe shall then be opened and a second plug inserted on top of the grout and the top of the well casing pipe resealed. A measured volume of water, calculated to fill the well casing pipe except for the bottom 10 to 15 feet, shall be pumped into the well casing pipe, pushing the second plug to within 10 to 15 feet above the bottom of the well casing pipe and pushing most of the grout from the bottom of the well casing pipe up into the annular space. As an alternative, a drill stem may be used to push the top plug down to near the bottom of the well casing pipe. For this alternative, the plug may not be attached to the drill stem. If the bottom plug used is longer than the gap between the bottom of the suspended well casing pipe and the bottom of the upper enlarged drillhole, it is not necessary to pump in a measured volume of water. A conductor (tremie) pipe shall be available at the drill site in case the grout does not flow at the ground surface. The water pressure in the well casing pipe shall be maintained for 12 hours until the grout has set and before well construction may continue.
NR 812.20(3)(f) (f) Halliburton (single plug) method. This method may only be used for wells when the upper enlarged drillhole is less than or equal to 200 feet deep or when drilling mud or bentonite slurry has been circulated in the upper enlarged drillhole from the bottom up to the ground surface prior to grouting. As depicted in figure 16, the grout shall be placed as follows: The well casing pipe shall be suspended a short distance above the bottom of the upper enlarged drillhole. A measured volume of grout, calculated to seal the annular space and to fill the bottom 10 to 15 feet of well casing pipe shall be pumped into the well casing pipe through a small diameter pipe extending watertight through the well seal. A drillable spacer plug shall be inserted into the well casing pipe and the top of the well casing pipe sealed watertight. A measured volume of water, calculated to fill the well casing pipe except for the bottom 10 to 15 feet shall be pumped into the well casing pipe, pushing the plug down to about 10 to 15 from the bottom of the well casing pipe and most of the grout from the bottom of the well casing pipe up into the annular space. A landing collar should be installed near the bottom of the well casing pipe to prevent the plug from being forced out the bottom. As an alternative a drill stem may be used to push the plug down. For this alternative the plug may not be attached to the drill stem. If the plug used is longer than the gap between the bottom of the suspended well casing pipe and the bottom of the upper enlarged drillhole, it is not necessary to pump in a measured volume of water. A conductor (tremie) pipe shall be available at the drill site in case the grout does not flow at the ground surface. The water pressure in the well casing pipe shall be maintained for 12 hours until the grout has set and before well construction may continue.
NR 812.20(3)(g) (g) Grout displacement method. This method may only be used for wells when the upper enlarged drillhole is less than or equal to 200 feet deep or when drilling mud or bentonite slurry has been circulated in the upper enlarged drillhole from the bottom up to the ground surface prior to the grouting. As depicted in figure 17, a measured volume of grout calculated to be of adequate quantity to seal the annular space plus at least 15% of that volume shall be placed into the upper enlarged drillhole through a conductor (tremie) pipe. The well casing pipe shall be fitted with centering guides and a drillable plug at the bottom and shall be lowered through the grout to the bottom of the upper enlarged drillhole allowing the grout to be forced up into the annular space. If necessary, pressure shall be applied and maintained on the top of the well casing pipe to hold it in place for at least 12 hours or until the grout sets. Water may be added to the well casing pipe to provide extra weight. If the grout does not flow at the ground surface the remainder of the annular space shall be filled with grout placed through a conductor pipe that shall be at the drill site.
- See PDF for diagram PDFFigure 11. Conductor (tremie) pipe-gravity method for neat cement grouting.
- See PDF for diagram PDFFigure 12. Conductor (tremie) pipe-pumped method for neat cement grouting.
- See PDF for diagram PDFFigure 13. Grout (float) shoe-pumped method for neat cement grouting.
- See PDF for diagram PDFFigure 14. Well seal/conductor (tremie) pipe-pumped (Braden-Head) method for neat cement grouting.
- See PDF for diagram PDFFigure 15. Halliburton (double plug) method for neat cement grouting.
- See PDF for diagram PDFFigure 16. Halliburton (single plug) method for neat cement grouting.
- See PDF for diagram PDFFigure 17. Grout displacement method for neat cement grouting.
- See PDF for diagram PDFFigure 18. Street elbow method for neat cement grouting.
NR 812.20(3)(h) (h) Street elbow method. As depicted in figure 18, a small diameter hole is cut through the wall of the well casing pipe near the bottom of the string of well casing pipe. A street elbow is welded watertight through this hole. The male end of the street elbow extends out into the annular space. A ball check valve is threaded into the female end of the street elbow inside the well casing pipe. The top threads on the check valve are “left-handed". A string of conductor (tremie) pipe is threaded into the top of the check valve. The entire string of well casing pipe and conductor pipe are set to the bottom of the upper enlarged drillhole. The grout is pumped down through the conductor pipe and up into the annular space. The grout must flow at the surface with the same consistency as the grout entering the conductor pipe. Immediately following grouting, the conductor pipe is screwed out of the left-hand thread of the check valve and removed. The check valve prevents the grout from moving back inside the well casing pipe. After the grout has set, the drill stem is lowered to the bottom of the inside of the well casing pipe to knock the street elbow off the well casing pipe before well construction continues.
NR 812.20(4) (4)Sodium bentonite water slurry placement methods. When neat cement grout is not required in Tables I to IV and is not to be used, the annular space between any upper enlarged drillhole and the well casing pipe shall be sealed as follows:
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.