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WPT® Water Cooled Spring Applied Brakes are a high energy absorbing solution used as a dynamic tensioning, static holding, or emergency stop brake. These brakes are spring-applied and released through pneumatic or hydraulic pressure. The WCB Spring Applied Brake is ideal for applications that require dissipation of large thermal loads such as marine winches, drilling rig drawworks, and logging equipment.
Unit of Measure

Specifications

Brands

 N/A WPT®

Type

 N/A Spring-Applied

Medium Coefficient Torque Rating

 N/A 238000 lbf·in26900 N·m

High Coefficient Torque Rating

 N/A 368000 lbf·in41600 N·m

Note for Torque Rating

 N/A Pneumatic Rated Actuator Pressure: 100 psi (7 bar) All sizes Pneumatic Max Actuator Pressure: 130 psi (9 bar) All sizes
Hydraulic Rated Actuator Pressure: 18" = 330 psi (23 bar), 24" = 380 psi (26 bar), 36" = 410 psi (28 bar)
Hydraulic Max Actuator Pressure: 18" = 430 psi (30 bar), 24" = 490 psi (34 bar), 36" = 530 psi (37 bar)
Torque is directly proportional to the actuator pressure applied.
Low Coefficient and Extra-High Coefficient Friction Material offerings are available.

Heat Dissipation Capacity

 N/A 650 hp485 kW

Minimum Freshwater Flow

 N/A 65.0 gpm246 L/min

Note for Heat Dissipation Capacity and Minimum Freshwater Flow

 N/A Flow and heat dissipation ratings are for parallel water flow through the jackets. Rated heat dissipation requires a freshwater flowrate of 1 gpm for every 10 hp (one liter per minute for every 2 kW) and are based upon a 50ºF (28ºC) temperature rise between the inlet and outlet. The outlet water temperature should not exceed 170ºF (77ºC). Maximum static inlet water pressure is 45 psi (3.1 bar) for the 18"/24"and 40 psi (2.8 bar) for the 36". Maximum dynamic inlet / outlet water pressure is 60 psi (4.1 bar) / 20 psi (1.4 bar) for all sizes. Ethylene Glycol is the recommended coolant additive. At 50% concentration in water, the required flowrate is 1.5 times the freshwater flowrate, due to the reduced specific heat of the solution. Seawater may be used as a coolant, with the same flow characteristics as with freshwater, and purging with freshwater after each use.

Maximum Free-Wheel Speed

 N/A 1450 rpm

Maximum Slip Speed

 N/A 970 rpm

Total Weight

 N/A 1700 lb790 kg

Hub and Drive Plate (DP) Weight

 N/A 430 lb200 kg

Hub and Drive Plate (DP) Inertia

 N/A 160 lb·ft²6.8 kg·m²

Dimensions

Dimension - A1 N/A 29.998 in761.95 mm

Dimension - A Tolerance

 N/A +0.000 in-0.003 in+0.00 mm-0.08 mm

Hole Circle (B)

 N/A 28.75 in730.3 mm

Diameter (B)

 N/A 21/32 in16.7 mm
Quantity2 N/A 10

Dimension - C

 N/A 24.375 in619.13 mm

Dimension - C Tolerance

 N/A +0.000 in-0.003 in+0.00 mm-0.08 mm

Thread Size P

 N/A 3/4

Thread Type

 N/A National Pipe Thread (NPT)

Dimension - D

 N/A 30-5/8 in777.9 mm

Dimension - E

 N/A 21-1/8 in536.6 mm
Minimum Bore Range3 N/A 2.75 in69.9 mm
Maximum Bore Range4 N/A 7.00 in177.8 mm

Features

Features

 N/A
  • Available in air or hydraulic actuation and hydraulic release
  • Clutch configurations available
  • Spring-applied with hydraulic or pneumatic release available
  • Dual hydraulic or pneumatic actuation is available
  • Available with a Full Marine Corrosion Protection package
  • Type approval certifications available in DNV and ABS
  • Standard mounting hole pattern for OEM applications, rebuilds, or retrofits
  • O-ring water jacket design allows for fast, easy field service
  • Full Marine Corrosion Package available

Note

Note

 N/A Contact WPT® Power for final selection, product flexibility, application guidance and approval. Certified prints available on request. Dimensions and Specifications are considered as reference only and subject to change.
  • 1 36” brakes: +0.000/-0.005 (+0.00/-0.13)
  • 2 18” and 24” brakes have (10) mounting holes based on a (12) hole pattern. 36” brakes have (14) mounting holes based on a (16) hole pattern. (2) holes omitted for coolant inlets/outlets
  • 3 Maximum bores shown are with a standard square key. Contact WPT® Power for bore sizes exceeding those shown.
  • 4 Maximum bores shown are with a standard square key. Contact WPT® Power for bore sizes exceeding those shown.