Pitless adapters and pitless units

Pitless adapters and pitless units. Pitless adapters and pitless units. Pump installers installing pitless adapters or pitless units to make subsurface connections to wells shall meet all of the following requirements, as applicable: (2) General requirements. No pump installer or person installing pumps may install a pitless adapter or pitless unit on a well that has a condition in an approval or variance that requires the casing to have a permanent grout envelope that extends to the ground surface. A pitless adapter or pitless unit shall be installed according to the manufacturer’s instructions and any approval conditions. All subsurface connections shall be made in a watertight manner and in accordance with all of the following requirements that are applicable: (a) Weld-on pitless adapters. A weld-on adapter or pitless unit shall be welded or threaded to the well casing pipe according to sub. (3) or (4) . All welding shall be performed in accordance with s. NR 812.18 . (b) Pitless adapter and pitless unit sizing and type. The inside diameter of a pitless unit may not be smaller than the inside diameter of the well casing pipe. The pitless adapter shall be constructed to provide complete clearance within the internal diameter of the casing and may connect to the casing by a threaded connection, welded connection, bolted flange with gasket, clamp and gasket, or compression gasket. No part of a pitless adapter may extend into the inside of the well casing pipe prior to the installation of the pump, except that a bolt-through pitless adapter may be installed for a well with polyvinyl chloride well casing pipe that has a permanently attached screen. (c) Pitless adapters and units for school and high capacity wells. An above-ground discharge shall be provided for all school and high capacity wells except that a pitless unit or a weld-on pitless adapter may be installed in accordance with sub. (3) if the welded or threaded joints are pressure tested for leakage using a packer and pressure gauge or by a comparable testing procedure. The adapter or unit joints shall be tested and proven watertight under a pressure of not less than 14 pounds per square inch. A soap and water solution shall be applied to welds to identify any leaks, and all leaks shall be repaired with additional welding prior to starting the pressure test. The pressure shall be maintained for at least 30 minutes. The pump installer shall notify the department at least 24 hours before testing. (dm) Pitless control modules. Pitless control modules designed to house pressure tanks and control valves at the wellhead shall either be welded watertight to the casing or attached with a threaded coupling. (3) Pitless unit connections to steel well casing pipe. (a) Pitless unit connection procedures. When a well casing pipe is not terminated at the desired depth for the installation of a factory assembled pitless unit, the well casing pipe shall be cut off at the desired height, and the pitless unit may be welded or threaded and coupled to the top of the well casing pipe by one of the following methods as depicted in Figure 1 of ch. NR 812 Appendix : 1. Cutting off the well casing pipe squarely, providing a bevel for the top of the well casing pipe and welding the beveled end of the unit to the beveled end of the well casing pipe. 2. Cutting threads on the top of the well casing pipe with a pipe die and threading a full-standard recessed coupling watertight to the threaded end of the unit and to the top of the well casing pipe. 3. Welding a pipe nipple, having threads on one end, beveled on the other end and meeting the requirements specified in s. NR 812.11 (6) , to the cut off top beveled end of the well casing pipe and threading a full-length standard recessed coupling watertight to the threaded end of the unit and to the nipple. The top of the well casing pipe and the bottom of the pipe nipple to be welded shall both have beveled ends. If the pitless unit has female threads, the unit may be threaded watertight directly to the threaded end of the nipple. 4. Reaming out the threads of a full standard recessed coupling, at least 1/3 the length of the coupling, and welding the coupling to the top of the cut-off well casing pipe with a fillet weld on the inside or the outside contact surface of the coupling. (b) Restrictions. When installing a factory assembled pitless unit, the following restrictions shall be followed: 1. The threaded lower end of a pitless unit may not be welded to the cut-off end of a well casing pipe. 2. The threaded ends of a short model, factory-assembled pitless unit may not be welded to the top of a cut-off well casing pipe nor to the section of riser pipe extending from the unit to ground grade, except that the unit may be welded to the cut-off well casing pipe and to the riser pipe if the ends of the unit, the well casing pipe, and the riser pipe are cut and beveled according to par. (a) 1. 3. Factory-assembled pitless units, including those fabricated with pitless receiver tanks, may not be connected to the well casing pipe by means of a compressible joint. (4) Pitless unit and pitless adapter connections to thermoplastic well casing pipe. (a) Solvent welding. The thermoplastic coupling shall be threaded onto the pitless unit before it is solvent-cemented to the top of the thermoplastic well casing pipe. Pitless unit connections for thermoplastic well casing pipe are depicted in Figure 2 of ch. NR 812 Appendix . (b) Lubricants and threading casing. Only approved lubricant specifically intended for use with thermoplastic well casing pipe may be used with threaded couplings used for pitless units and pitless adapters. A threaded joint shall be tightened no more than one full turn using a strap wrench. (c) Threaded coupling restriction. Threaded couplings may only be used for installation of pitless units or pitless adapters after placement of the well casing pipe. (d) Riser pipes. Steel pitless units or pitless adapters may not be welded after they are attached to thermoplastic well casing pipe. The portion of the well casing pipe above a short length pitless unit shall be steel or thermoplastic well casing pipe meeting the requirements specified under s. NR 812.11 . When thermoplastic well casing pipe is extended above the ground surface, the thermoplastic pipe shall be of the type with inhibitors recommended for use in direct sunlight or shall be contained in a pumphouse or in an oversized steel pipe extending from below the frost depth to the top of the thermoplastic pipe. A permanent tag bearing the message “plastic well casing pipe” shall be attached to the top of any steel riser pipe. (5) Pitless receiver tanks. Steel buried tanks that are part of a pitless unit shall meet the requirements under s. NR 812.33 (1) (a) 1. and (b) .