Goulds Pumps VIT - IOM - Manual (Page 36)

1
1. Bypass to suction
Install the high-pressure seal
High-pressure seals have these characteristics:
• Usually cartridge seals
• Shipped assembled and ready for installation
• Are either single or dual seals
Mechanical seals on pumps with over 1200 psi (85 kg/cm 2 ) gauge discharge pressure, or a pressure level
specified by the seal manufacturer, are normally fitted with backup rings. These rings are installed after the
seal installation, between the drive collar of the seal and the bottom of the flanged-pump coupling.
1. Install the backup ring:
a) Thread the bottom backup ring into the top backup ring until it bottoms out.
b) Slide the backup ring assembly over the shaft and position it on the seal.
2. Install the spacer coupling and the driver.
3. Set the seal into position.
4. Check the TIR on the headshaft above the mechanical seal.
5. Adjust the backup ring assembly.
Installation (Continued)
34 Model VIT Installation, Operation, and Maintenance