Milburn Emile Dupre
Engineering at Bear Trl, Orange, TX
License number
Louisiana PE.0024976
Issued Date
Jun 30, 1992
Expiration Date
Sep 30, 2001
Category
Civil Engineer
Type
Mechanical Engineer
Address
Address
2901 Bear Trl, Orange, TX 77632
Professional information
Barrier Fluid Seal, Reciprocating Pump And Operating Method
US Patent:
6158967, Dec 12, 2000
Filed:
May 11, 1999
Appl. No.:
9/309840
Inventors:
Milburn Emile Dupre - Orange TX
Assignee:
Texas Pressure Systems, Inc. - Orange TX
International Classification:
F04B 1700
US Classification:
417 53
Abstract:
A barrier fluid seal assembly is provided for a reciprocating rod, where the reciprocation of the rod is used to pump barrier fluid through a barrier fluid chamber. The rod has first and second seals, and the barrier fluid chamber is located between the seals. Barrier fluid pressure is maintained higher than process fluid pressure so that if there is leakage past the seals, then it is barrier fluid that leaks, which keeps the seals clean and flushed. A reciprocating pump may incorporate the barrier fluid seal assembly for sealing around a plunger. A method of operating first and second reciprocating pumping cylinders provides bumpless transfer of pumping from one pumping cylinder to the other pumping cylinder. Motion controls, such as a controller using a position transducer for a hydraulic piston and a servo-valve for providing hydraulic fluid to the hydraulic piston, are used to compress liquid process fluid in one pumping cylinder prior to beginning its pumping stroke. A total plunger speed is determined for plungers in pumping cylinders A and B, and total plunger speed is held essentially constant prior to hand-off of pumping from one pumping cylinder to another pumping cylinder.