Patent GB-822112-A (GB)
Title: Improvements in or relating to a header for use on a submerged pumping apparatus
IPC: F04D29/60
Filed: 1957-09-03
Abstract: 822,112. Reciprocating pumps ; injectors. TOKHEIM CORPORATION. Sept. 3, 1957 [Nov. 5, 1956], No. 27805/57. Classes 71 and 102(1). [Also in Groups XXIX and XXXV] A mounting for a submersible pump comprises a header body fixed to a nipple extending upwardly from a tank, a delivery pipe connected to the header body, a cap removably mounted on the header body and carrying a discharge pipe depending into the tank, and a motor-pump unit mounted on the lower end of the discharge pipe, the header body and cap defining a fluid passage connecting the top of the discharge pipe to the delivery pipe, and the discharge pipe and motor-pump unit being withdrawable by lifting the cap from the header body. A header body 7, Figs. 2, 7 and 8. is attached to a nipple 1 mounted on the top of an underground petrol storage tank 161. A motorpump unit 83 is suspended within the tank by means of the pump discharge pipe 81 which is attached at its upper end to a central boss 77 of a header cap 71. The pumped petrol passes from the top of the discharge pipe 81 into a discharge chamber 78 within the central boss 77 and thence by way of a non-return valve 141 to an annular delivery chamber 19 surrounding the boss 77 and leading by way of a delivery pipe 24 to petrol dispensing pedestals. There may be two delivery pipes and two non-return valves. A flange 67 on the boss 77 co-operates with a flange 11 on the header body 7 to form the bottom wall of chamber 19. Air or gas entering the chamber 78 is returned to the tank through a tube 55 which extends from the top of the chamber to the space between the pipes 1 and 81. A restriction 57 limits the return flow of liquid. Excess pressure occurring in chamber 19 is relieved to chamber 78 through a reliefvalve, preferably of tyre valve type, mounted in a fitting 155. The motor supply leads are carried by a conduit 91 within the discharge pipe 81, and are connected to the input leads 41 by means of a plug 123 mounted on the cap 71 and a socket 33 mounted on the body 7. A removable plug 113 gives access to liquid-tight packing 97 provided around the conduit 91. After removal of screws 153, the cap 71, pipe 81 and motor-pump unit 83 can be lifted away as a single unit, the plug 123 disengaging from the socket 33 at the same time. Gaskets 63, 65 are held by retainers 73, 75 so that they lift away with the cap 71. Where two or more tanks 161, 163 are connected by a siphon 165 and served by a single pump, the air release tube 55 may be omitted and a siphon primer 167, Figs. 7 and 9, is used instead. The primer comprises an injector which is energized by liquid flowing from the chamber 78 by way of a pipe 197 to the jet pipe 199 of the injector, returning to the tank 161 through a fitting 195. The passage of the liquid across the suction chamber 201 of the injector creates a suction to draw air and gas from the siphon 165 through a pipe 185 and a non-return valve 173. Any air or gas in the chamber 78 is returned to the tank through the pipe 197 and the injector. Valve 173 is preferably moulded integrally with an O-ring seal 175 from synthetic rubber. Before the cap 71 is lifted as described above, pipe 197 is released from a fitting 191.