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    The DI Type coupling has a “Drop-In” spacer assembly that is assembled at the factory. The coupling consists of two hubs and a spacer assembly comprising of the spacer, two unitized disc packs, and two guard rings. The disc packs are bolted to the spacer and guard rings at the factory using the torque values recommended by Lovejoy for the disc pack bolts. With the hubs mounted on the shafts, the entire disc pack assembly can be “Dropped In” place between the two hubs. The hubs are piloted to ensure proper centering of the spacer assembly. This piloting serves as an anti-flail feature and aids in the coupling’s ability to meet the balance standards mandated by API. This style coupling is designed to meet the balance and anti-flail requirements specified in API-610.

    Oversized, or Jumbo, hubs are available for use with the DI Type coupling to allow for larger bore sizes on most DI coupling sizes. This allows for the use of smaller DI couplings in applications where a smaller size coupling can still accommodate the application torque.
    The DI Type coupling is the standard 6 bolt coupling with two hubs and a spacer assembly that can be installed or removed without disturbing the equipment and hubs and without removing the disc packs from the spacer assembly. Custom spacer lengths can be specified for special applications. The coupling has two flex planes (one at each disc pack) so it can accommodate parallel misalignment by the angular misalignment in each disc pack. This configuration will also accommodate axial misalignment within the specified limits.
Unit of Measure

Specifications

Description 

 N/A DI255-6-HUB-RSB

Hub Style

 N/A Standard

Type

 N/A Disc Coupling Hubs

Hub Material

 N/A AISI 1045

Style

 N/A Unbored

Color

 N/A Metallic

Bore Type

 N/A Rough Stock Bore

Coupling Series

 N/A DI-6

Coupling Type

 N/A Disc

Weight

 N/A 62.72 lb

Weight (Complete Coupling w/ Max. Bores)

 N/A 159.00 lb

Dimensional Data

Size

 N/A 255-6

Set Screw Style Coupling Size (Dimension T)

 N/A No Setscrew

Length thru Bore

 N/A 4.530 in115.06 mm

Overall Length

 N/A 18.940 in481.00 mm

Max. Bore (Dimensions ID1/ID2)

 N/A 4.940 in125 mm

Dimension FD

 N/A 10.350 in263.00 mm

Dimension HD

 N/A 6.890 in175.00 mm

Dimension S

 N/A 5.510 in140.00 mm

Distance between Shaft Ends (Dimension BSE)

 N/A 9.880 in251.00 mm

Cubic inches

 N/A 485.26493 in³

Performance Data

Nominal Torque

 N/A 90300.00 in·lb

Max. Torque

 N/A 180600.00 in·lb

Max. Speed (Unbalanced)

 N/A 3080.00 rpm

Max. Speed (Balanced)

 N/A 7700.00 rpm

Axial Misalignment (∆ Ka)

 N/A 0.185 in

Max. Angular Misalignment

 N/A 1.00 º

Torsional Stiffness x 106

 N/A 41.00 in·lb/rad

Rated Power at 100 rpm

 N/A 143.20 hp106.80 kW

Features

Features 

 N/A
  • Designed to meet the API 610 Standard
  • Support for additional API requirements available on request
  • Unitized disc pack
  • Infinite life if properly aligned
  • Torsionally rigid without any back lash
  • No need for lubrication or maintenance
  • No wearing parts and high resistance to harsh environmental conditions
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