Method and Apparatus for Preforming Cementing Operations on Top Drive Rigs

A method of performing cementing operations comprising the steps of:

• a) connecting flow lines to a cement head at a rig floor, said cement head comprising:
• i) a body member having an upper end defining at least one dog recess, a lower end and a bore extending from said upper end to said lower end, and a first box end threaded connector having interrupted threads at said upper end;
• ii) a sub assembly having an upper end, a lower end, a bore extending from said upper end to said lower end, and a pin end threaded connector having interrupted threads disposed on said lower end, wherein said pin end connector is mated with said first box end threaded connector of said body member;
• iii) a ring having a top, a bottom and at least one face dog, wherein said ring is slidably received on said sub assembly, and said at least one face dog is received within said at least one dog recess on said upper end of said body member;
• and
• iv) a locking assembly for selectively securing said ring against said body member;
• b) lifting said cement head above said rig floor;
• c) pumping fluid through said cement head;
• d) lowering said cement head to said rig floor;
• e) disconnecting said sub assembly from said body member;
• f) re-connecting said sub assembly to said body member;
• and
• g) re-lifting said cement head above said rig floor.