Page 211 - Know and Understand Centrifugal Pumps
P. 211
Know and Understand Centrifugal Pumps
- Disaster Bushings for API compliance
Cartridge Seal designs comply with most pump standards like:
- ANSI
- API
- IS0
- DIN
Here is an illustration of a typical cartridge mechanical seal mounted on
a shaft in the seal chamber of the pump (Figure 13-18).
1. Static ‘0’ ring. 9. Setscren.
2. Spring. 10. Gland.
3. Dynamic ‘0’ ring. 11. Nuts.
4. Rotating face. 12. Spacer for spring tension.
5. Stationary face. 13. Flush line.
6. Static ‘0’ ring. 14. Cooling and draining.
7. Self alioning springs. 15. Pump body.
8. Disaster bushing APi.
Figure 13-18
Double seals
Double seals are also known as dual seals. They are used:
1. As an environmental control in difficult sealing applications.
2. To compensate for certain operational conditions like:
Operating a pump against a shut valve or ‘dead heading’
conditions.
Inadequate NPSHa.
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