Design Questionnaire - Imperial

Please complete the Design Questionnaire form below, when finished, click the "submit" button below.

Alternatively, you can download a pdf of the Design Questionnaire, for print, by clicking here.

Company and Address:
 Name of Power Station:
Country:
Ultimate Owner:
Manufacturer of Machine:
Type (e.g. Kaplan etc):
Telephone: Number of Units:
Date: Machine Description: New Existing
Email: Vertical Horizontal

1. Function of Machine: Turbine Pump Turbine / Pump
2. Water: Fresh Salt
3. Impurities in Water: Sand Silt Other
  Has a water analysis been supplied? Yes No
  Details given of known corrosion problems: Yes None known
4. Normal Temperature of Water: °F
5. Total Head on the Machine: feet
6. Tailwater Head relative to the Seal: Above Below
7. Output of Machine: KW
8. Speed: RPM Normal
    RPM Max (Over-run)
9. Shaft Diameter: Measured (inch ±)
    From Drawing (inch ±)
10. Shaft Sleeve Diameter: Measured (inch ±)
    From Drawing (inch ±)
11. Is Seal above or below Runner: Above Below
12. Axial Shaft Vibration (whilst running):
Frequency / Minute 
  - Runner moves towards seal Towards Seal (inch)
  - Runner moves away from seal Away from Seal (inch)
13. Shaft Axial Movement for Maintenance: Lift (inch) Drop (inch)
14. Radial Shaft Movement: inch
15. Details of Mains Voltage etc for any electrical components to be supplied: D.C A.C Hertz

Note: It is very important to give details of all pressures to be sealed, particularly zero or minus pressures

Machine Mode Pressure in Seal Chamber (p.s.i) Duration at one time
16. Max Load Generate:
17. Min Load Generate:
18. Synchronous (No load full speed in water):
19. Synchronous (Full speed in air. Tailwater depression):
20. Pump:
21. Instantaneous Surge Pressure at Air Admission: Instantaneous
22. Static:
23. Any Other Modes:

24. At which position is air injected: Above Below
25. Will Seal operate at zero or vacuum pressure in the seal chamber? Zero Vacuum Neither
26. Is a supply of water, filtered to 25 microns, available for direct lubrication of seal faces if zero or vacuum conditions are encountered? Yes No
27. Is the Seal Chamber always full of water before start-up (thus avoiding the possibility of dry running)? Yes No
28. What is the lowest height above the Seal at which a control / gauge panel would be fitted if supplied? Feet Metres

29. Can a recess or a raised shoulder be machined on the shaft or sleeve for the rotating seal ring? Yes No
  - Recess Shaft Sleeve Shaft Sleeve
  - Sholuder Shaft Sleeve Shaft Sleeve
30. Can shaft hub or nut cover be tapped to carry a rotating seal ring?
  - Shaft Hub Yes No
  - Nut Cover Yes No
31. Is there access during and after commissioning for spring adjustment?
  - During Yes No
  - After Yes No
32. Wear indicator type required? Direct reading at seal
    Remote reading
33. Turbine drawings must be sent to Sterling with the questionnaire, giving the following information:
  • Axial space for seal relative to the seal mounting face. Note: Dimensions to an oil pan must be to the nearest part, e.g split flange. State if the oil pan rotates with the shaft.
  • Dimensional details and position of any shaft shoulder / recess which may interfere with the assembly of the seal.
  • Dimensional details of all housings or flanges which surround the seal.
  • Dimensional details of all holes and runner bolts in the shaft hub, or dimensional details of the nut cover, as appropriate.
  • Indicate which components can be modified or deleted.
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