Class D2 Centrifugal Pumps Brochure

Darling Class D2 two-stage centrifugal pumps are most widely used in boiler feed service. Furthermore their design affords excellent adaptability to many other high pressure applications. Class D2 pumps are particularly suitable for condensate transfer, and booster service. Class D2 pumps can be equipped with various types of drives. Motor, engine or stream turbine. CASING: Heavy cast iron with integral suction and discharge flanges. Cross over passage and volutes smooth finished and shaped for maximum efficiency. IMPELLERS: Daralloy opposed enclosed type, arranged to permit suction pressure only on packing gland. Smooth unobstructed inlet for maximum efficiency SHAFT: Stainless steel, shouldered to position bearings. Increased diameter between bearings to reduce flexing. Keyed and tapered for rigid fit of impellers. BEARINGS: Heavy duty type single race oil-lubricated ball bearings. PACKING GLAND: Bronze with swing type adjusting bolts for easy access to packing. FRAME: Box type one-piece casting comprising head, bearing housing, deep stuffing box, integral drip pan with drain connection. Three-point mounting eliminates distortion. BASE: Standard base is heavy structural steel designed to take pump and driver and drilled for anchor bolts. Pump parts are stud and spigot mounted for permanent alignment of rotating element. Design permits removal of entire liquid end without disturbing piping. CLASS ‘D2’ Ø TWO STAGE Ø OPPOSED IMPELLERS Ø BALL BEARINGS FOR BOILER SERVICE FEED AND OTHER HIGH PRESSURE STANDARD - Stainless shaft sleeve - Daralloy impellers - Packed stuffing box - Oil lubricated bearings - Steel base - Coupling guard - 250 ANSI flange on discharge November 2003 · 3.229 TROUBLE FREE HIGH TEMPERATURE PUMP Ø No gland or seal to service Ø No leakage on the floor Ø Permanent alignment Ø Minimum number of parts (one piece casting) Ø Self-lubricated graphalloy bearing Ø Built-in overload protection Ø One piece rotating assembly including stainless steel shaft and all brass Duro impeller Ø 3500 RPM jet pump motor Ø Factory assembled and wired Ø No overhead tank Ø No foundation nor alignment For unit selection: 1) Calculate your system capacity and convert it to pump capacity. 2) Calculate your pressure requirement. Do not add safety factor. 3) Enter the selection table and determine product No. and receiver size. WITH SINGLE PHASE MOTORS (3 PHASE MOTORS NOT AVAILABLE) Unique self-contained “packaged” condensate return unit & low pressure boiler feed pump PUMP MODEL NUMBER: SINGLEX 1 U 1/3 DUPLEX 1 UD 1/3 SINGLEX DUPLEX PUMP CAPACITY USGPM PRESSION PSI Product No. Receiver Size Product No. Receiver Size 4.5 10 15 20 9 10 15 18 58285 9 GALLON 15 10 15 22.5 10 58286 40 GALLON 58322 40 GALLON SYSTEM CAPACITY SQUARE FT. EDR STEAM LBS/HR CONDENSATE USGPM APPROX. BOILER HP PUMP CAPACITY USGPM 3,000 750 1.5 30 4.5 6,000 1,500 3.0 60 9 10,000 2,500 5.0 100 15 15,000 3,750 7.5 150 22.5 November 2003 · 5.201