Chemical Injector

Abstract

Thus there is disclosed a reciprocating top drive system that reciprocates a pump rod that goes to the bottom of the pump stinger to the bottom of the tank. The pump head is mounted at the end of the sting and is submerged in fluids in the tank. The pump head is carbide piston and sleeve with a very tight machined tolerance that allows the piston to pump up and down and glide in a film of the chemical that is slipping by the tolerance.

1 . A chemical injector, comprising:
 a tank;   a stinger extending into the tank, the stinger having a pump head comprising a piston head within a sleeve, the sleeve defining a chamber, and having an inlet check valve for one way flow of fluid into the chamber and an outlet check valve for one way flow of fluid out of the chamber, the piston bead having a close tolerance liquid seal with sleeve;   a drive connected to reciprocate the piston head in the sleeve; and   outlet tubing connected to the outlet check valve and the outlet tubing extending out of the tank.   
     
     
         2 . The chemical injector of  claim 1  in which the liquid seal comprises a metal alloy to metal alloy seal. 
     
     
         3 . The chemical injector of  claim 1  in which the outlet tubing is connected into a sight glass outside of the tank. 
     
     
         4 . The chemical injector of  claim 1  in which the stinger extends downward into the tank from an upper surface of the tank. 
     
     
         5 . The chemical injector of  claim 1  further comprising a housing enclosing the drive for the piston head, and the outlet tubing passing through the housing. 
     
     
         6 . The chemical injector of  claim 1  contained within a secondary containment structure. 
     
     
         7 . The chemical injector of  claim 1  in which the tank is formed of more than one compartment.