WELCOME TO

1. 2014 – Edmonton MRO Technical Conference and Workshops WELCOME TO

2. API 610 Type OH6 Pumpsa.ka. High Speed Integrally Geared Pumps presented by Sandy Sutherland

3. Abbreviated OH6 History • The invention of “Barske” hydraulics in pre WW2 Germany by U. M. Barske. • The migration from military use into commercial aircraft use in the late 1950s, coincident with the use of integral gearing for higher impeller RPMs to reach higher performance levels with maximized Ns. • The evolution into industrial use in the early 1960s. • API 610’s incorporation of OH6 in 7th Edition of 1989.

4. What do they do for us ? • Provides for the use of a single stage centrifugal to be used. • Provides for the use of a centrifugal operating at Qbep that delivers a relatively low flow with a very high head. • Provides reliable centrifugal pumping for *certain industrial process fluid streams that conventional hydraulics are not well suited for. ( * PTA in suspension)

5. What do they look like inside ? • Following are three examples

6. The classic Vertical Inline

7. The classic flipped on its side

8. Another variation of the Horizontal

9. Hydraulics Types, Characteristics & Allowable Flow Ranges • First some range charts to give us a feel as the overall range that OH6s presently cover.

10. Single Impeller OH6s

11. Multiple Impeller OH6s

12. Discussion Points

13. NPSHR & Use of Inducers

14. Shaft Sealing Considerations • First, keep in mind that API 682 seals are invalid for OH6s. • Following are some coloured sealing arrangements images for your ongoing reference. • Next there are some coloured bushing arrangements images for your ongoing reference. • Then we will discuss Seal Chamber Margin to Flash and some solutions.

15. SLINGER SLEEVE ASSEMBLY THROTTLE BUSHING SPRING STATIONARY FACE WEDGE RING ROTATING FACE Single Seal – Arrangement 1 SINGLE SEAL

16. Tandem Seals – Dual Unpressurized – Arrangement 2 TANDEM SEAL

17. Double Seals – Dual Pressurized – Arrangement 3 DOUBLE SEAL

21. Seal Chamber Pressure • As affects Seal Chamber Margin to Flash. • OH6s in general have negligible seal chamber pressure rise above suction pressure. • Therefore low NPSHA application translate to low Seal Chamber Margin to Flash unless something is done to manipulate Pressure and/or Temperature conditions in the seal chamber

22. If Seal Chamber Margin to Flash is inadequate for inboard seal faces on product : • Suggested is the use of a special close clearance bushing in association with an appropriate Plan 1x arrangement. • Or, application dependent, the use of a Plan 23 arrangement, with Plan forced circulation being a good option to consider.

23. Alternatively, for wet/wet unpressurized duals with poor Seal Chamber Margin to Flash : • Consider using a “semi-wet” lower as designed to thrive on low margin to flash, in association with a dry gas upper. • Particularly so for low S.G. / high and steep curved Vapour Pressure fluids. • Suggested is feeding the dry gas upper with Nitrogen, for support and sweep effects.

24. If an Atmospheric Side “Backup Bushing” is desired : • A quench type bushing modified for dry running may be fittable, but with limitations such as space based restriction of use for only with lower singles - no duals.

25. Please use O E M Shaft Sleeves • OH6 process seal shaft sleeves are very critical components. • Do not use anything suspect or out of spec. • End face flatness is an issue of light bands. • End faces parallelness is an issue of tenths’ of a thou’. • Checking sleeves needs a Height Gauge and a Grade A “Inspection” quality Granite Surface Plate. • Special hi strength materials can be required.

26. Rotordynamics • Sundynes have been Stiff Shaft since mid 80s. • Rarely, Flexible Shaft machines were built before then. • Generally, low mass Titanium impellers and/or inducers and HSSA shaft and support system stiffnesses are enough to manipulate Dry 1st Criticals to above rotationals by a minimum of 20 %. • Laterals relate to the HSSAs while Torsionals relate to the internal machine train and externals

27. Vibration Levels • Overall Displacements should be within *2.0 mils from Minimum Continuous Stable Flow to 110% of Qbep. • Discreets should be within 1.5 mils. (*75% of) • Overall Velocities should be within *0.142 in/s RMS. • Discreets should be within 0.106 (*75% of) • Table 8 of 610-11th alone does not govern (high speed) OH6 vibration levels, be sure to also use Figure 34. (rpm adjustment since 6th)

28. Integral Gearboxes

29. Lube Oil Systems

30. Original Selection & Rerating Considerations

31. Controls & Controls Philosophies

32. Condition, Predictive & Protective Monitoring

33. OH6 Frequencies Determination

34. Dominant Problem Areas • Primarily revolve about the dynamic sealing points : • Process sealing points. • Gearbox sealing points. • As are affected by all the other aspects presented. • Secondarily would be lube oil delivery and condition issues as can also affect the primary areas. • Gearing as a primary problem is very rare.

35. Questions & Answers • Feel free to ask away !

36. Available Resources Suggested • The allied resource of NatPro and Sundyne. • Various papers and articles from proceedings and periodicals. • Chapter 11 “High Speed Pumps” by Edward Gravelle in the 2nd Edition of Centrifugal Pumps Design & Application by Lobanoff & Ross. ( ISBN 0-87201-200-X ) • A “.pdf” format copy of this presentation. • Model specific Manuals from the Manufacturer. • Sundyne Centrifugal Pump Control Bulletin.

37. Thank you for your time and interest • Enjoy the remainder of the Conference.