Browsing by Author "Shultz, Richard R."

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Design And Experience With A 30,000 HP Magnetic Bearing Supported Motor Driven Turbocompressor For A Speed Range Of 600 To 6300 Rpm.
    (Texas A&M University. Turbomachinery Laboratories, 2000) Kummlee, Horst; de Groot, Wim H.; Lenderink, Gerrit M.; Shultz, Richard R.; Turbomachinery Symposium (29th : 2000)
    In the Northern Netherlands, after more than 30 years of production, the pressure of the gigantic Groningen onshore gas field is gradually decreasing, requiring up to 500 MW compression over the next 30 years to fulfil capacity obligations. Within a unique technical and contractual concept, up to 29 electric motor driven centrifugal compressors with 120 bar (1741 psi) discharge pressure will be installed to maintain the necessary input pressure for the Dutch pipeline network. Based on a thorough total cost of ownership evaluation, and considering the extended project duration and its special requirements, a future-oriented compression string was devised and installed in 1998, serving as the prototype for the remaining installations. Performance, design, and construction features of this oil-free turbocompressor string are described, highlighting the rotordynamic aspects of the supercritical rotating string with its extremely wide continuous operating speed range. The design aspects of the magnetic bearings are emphasized. Test results and initial field experience are addressed. Lessons learned and a recommendation for the API Standards Committee conclude the paper.
  • Thumbnail Image
    Item
    Modulated pressure damper seals
    (United States. Patent and Trademark Office, 1998-08-18) Vance, John M.; Shultz, Richard R.; The Texas A&M University System
    A damper seal and method of sealing and damping a rotating shaft are disclosed. The damper seal includes a stator housing, a plurality of cavities, a first modulator for modulating the fluid flow into the cavities, and a second modulator for modulating the fluid flow exiting the cavities less than the fluid flow entering the cavities to provide improved damping and sealing.
  • Thumbnail Image
    Item
    Pressure damper diverging labyrinth seals with circumferential partitions, and method of sealing
    (United States. Patent and Trademark Office, 1996-07-30) Shultz, Richard R.; Vance, John M.; The Texas A&M University System
    A damper seal (10) and method of sealing and damping a rotating shaft (12) is provided with a stator housing (14) and at least two sealing blades, an upstream sealing blade (16) and a downstream sealing blade (18). There are at least two partitioning walls (20) disposed between the sealing blades (16,18) and attached to the stator housing (14). The clearance between the downstream sealing blade (18) and the shaft (12) is greater than the clearance between the upstream sealing blade (16) and the shaft (12). The damper seal (10) restricts the flow of fluid from regions along the shaft that are at different pressures and damps vibratory or whirl motion of the shaft.