Patent ID: 8888105

Claim:
A mechanical seal system for containing a fluid in rotary shaft equipment having a stationary housing and a rotating shaft therein and having upstream and downstream directions along an axis of the shaft, comprising: a first rotating seal face, a first stationary seal face, and a first biasing member urging the first rotating seal face toward the first stationary seal face; a second rotating seal face downstream of the first rotating seal face, a second stationary seal face, and a second biasing member urging the second rotating seal face toward the second stationary seal face; a seal chamber surrounding the rotating shaft having an opening at an upstream end thereof where the rotating shaft enters the stationary housing, a seal gland forming an axial end wall of the seal chamber opposite the opening at the upstream end, and an opening in the seal gland through which the rotating shaft passes; a third rotating seal face downstream of the first and second rotating seal faces, a third stationary seal face, and a third biasing member urging the third rotating seal face toward the third stationary seal face, the third rotating seal face, third stationary seal face, and third biasing member being located outboard of and integrated with the seal gland.