RAS PROPELLER CLEARANCES
| Model | Suction x Delivery | Diameteral Allowance | Radial Clearance |
| RAF 125 | 5"x5" | 0.051 / 0.45 | 0.026 / 0.023 |
| RAF 150 | 6"x6" | 0.068 / 0.048 | 0.034 / 0.024 |
| RAF 200 | 8"x8" | 0.060 / 0.050 | 0.030 / 0.025 |
| RAF 250 | 10"x10" | 0.064 / 0.054 | 0.032 / 0.027 |
| RAF 300 | 12"x12" | 0.067 / 0.060 | 0.034 / 0.030 |
| RAF 350 | 14"x14" | 0.076 / 0.066 | 0.038 / 0.033 |
| RAF 400 | 16"x16" | 0.080 / 0.072 | 0.040 / 0.036 |
| RAF 500 | 20"x20" | 0.095 / 0.080 | 0.048 / 0.036 |
| RAF 600 | 24"x24" | 0.111 / 0.094 | 0.056 / 0.047 |
| RAF 700 | 28"x28" | 0.129 / 0.107 | 0.065 / 0.054 |
| RAF 750 | 30"x30" | 0.131 / 0.119 | 0.066 / 0.060 |
| RAF 900 | 36"x36" | 0.155 / 0.130 | 0.078 / 0.065 |
RAF PUMP SELECTION TABLE
| Model | Suction x Delivery | Min Flow in m3/Hr | Max Flow in m3/Hr | Type of Casing | Min / Max RPM of Pump |
| RAF 125 | 5"x5" | 50 | 120 | Casting | 2000/3000 |
| RAF 150 | 6"x6" | 80 | 250 | Casting | 1600/2900 |
| RAF 200 | 8"x8" | 260 | 500 | Casting | 1200/2400 |
| RAF 250 | 10"x10" | 500 | 800 | Casting/Fabricated | 980/1600 |
| RAF 300 | 12"x12" | 800 | 1250 | Casting/Fabricated | 800/1450 |
| RAF 350 | 14"x14" | 1000 | 1600 | Fabricated | 690/1200 |
| RAF 400 | 16"x16" | 1400 | 2100 | Fabricated | 650/1050 |
| RAF 500 | 20"x20" | 1800 | 3200 | Fabricated | 600/900 |
| RAF 600 | 24"x24" | 3000 | 5000 | Fabricated | 570/800 |
| RAF 700 | 28"x28" | 3600 | 6500 | Fabricated | 500/720 |
| RAF 750 | 30"x30" | 4000 | 8000 | Fabricated | 400/600 |
| RAF 900 | 36"x36" | 6000 | 11000 | Fabricated | 300/500 |
DESIGNED FOR CIRCULATION
OR CORROSIVE / ABRASIVE & PROCESS SOLUTIONS
Rage of Application Model RAF & RAFV Series 5", 6", 8', 10" 12", 14', 16", 18' and 20' up to 1 m.
Chemical : Forced evaporator & Crystallizer Circulation.
Paper : Black liquor concentration & Evaporator Circulation.
Petroleum : Polypropylene Reactor circulation Xylene Crystallizer.
Food : Cane, Mine, Sugar, Evaporator.
Municipal : Sewage Sludge, Circulation, sewage, disposal.
General : Raw Water pumping.
Range of Temperature : Up to 200" C
Range of System Pressure : Up to 10.5 Kg/cm2.
Range of Flow : Up to 11000 M3/Hr .
Heads : Up to 6 mtrs.
Design :
Features:
Stuffing box chamber matches the elbow design of casing so that smooth flow with minium losses take place, the 'K' factor for calculating losses across the elbow does not exceed 0.1 to 0.3 Available in horizontal single elbow, vertical, vertical cantilever & special design as required.
Direction of flow reversible. The discharge flange can be suction for liquid in which case the impeller is reversed end for end, resulting in suction pressure at stuffing box.
Pumps can be furnished with either clockwise or counter clock wise direction rotation looking from motor end.
Construction:
Heavy duty shafts are full cantilevered into pump elbows eliminating the need for internal bearings.
RAF Pumps are available with any of several different impeller designs. All are dynamically balanced & keyed to step-fit shafts for ease of removal & reassembly.
Pumps may be ordered for either top or end suction.
All RAF Pumps (horizontal) are back pull out construction eliminating the need to disturb the suction & delivery pipe lines up to 12".
Wear ring can be provided so that the area effected by impeller rotation at periphery due to tip cavitations, when pumping liquids at critical temperature.
Axial Thrust Bearings: Axial thrust to be absorbed by spherical roller or double row angular contact bearings.
Shaft Sealing: Packed stuffing box (Cooled or uncooled)
Special design for sealing along rotating shaft, available
Materials : Cast steel, Chrome Nickle Molybdenum cast steel (Feriet as well as Austenitic) special Ni-resist cast irons also available.
FlangesAccording to ANSI B 16.5 rating 150 lbs & optional 300 Lbs.
Flanged Connections :
Never force piping to make a connection with a pump
Use only fasteners of the proper size and material.
Ensure there are no missing fasteners.
Beware of corroded or loose fasteners.
Operation : Do not operate below minimum rated flow or with discharge valves closed.
Do not open vent or draining valves, or remove plugs while system is pressuring.
The AF pump generates flow by the thrust or lift action of rotating axial vanes of the impeller. Axial flow pumps generate high flow rates and low head which are ideal for re-circulation, evaporator and generator cooling systems. The AF has an elbow that directs the flow through the suction and out the discharge end of the pump. It can be used in the top or end suction configuration depending on the customer's needs.
Casing : The Casing is cast with 150# flat face suction and discharge flanges, it comes with an opening in the rear for a back -pullout. The back-pullout consists the bearing housing, shaft and impeller. The Casing has cast feet for mounting to a sub-base or it can be mounted directly in the piping. In Fabricated Casing first remove Propeller and then power end assembly will come out.
Propeller : The Propeller is cast with (4/3) fixed vanes. It is machined with internal steps for easy assembly onto the shaft. It comes configured for 0 or + 5 degree, clockwise or counterclockwise rotation, and top or end suction. The Propeller is dynamically balanced (double plane) per ISO 1940 to a quality grade G-16.
Shaft : The Shaft is cantilevered into the pump elbow to eliminate the need for internal bearings. It is designed to have small deflections, high critical speeds and corrosion resistance. The shafts are stepped for easy assembly with the Propeller. The shaft comes with a replaceable sleeve when used with stuffing boxes.
Bearings :The inboard redial bearing absorbs shaft radial loads and aligns the pumps shaft. It is either a ball or spherical roller bearing depending on pump size. The outboard trust bearing absorbs impeller thrust loads and comes as either back-to-back angular contacts or a single taper roller bearing, depending on pump size. Lubrication is by flood oil or grease, depending on customer requirements.
Configurations and Drives :Most AF pumps are V-belt driven to allow for varying speeds. V-belts can be configured for side by side overhead, under-slung or vertical operation. The pumps can be configured with gear reducers and or jack shafts for direct connect operation.
Back-Pullout : The back-pullout is based on power ends listed previously. It consists of bearing housing bearings, stuffing box, bearing bracket, adaptor, shafts. Shaft sleeve (w/packing), Propeller, keys, shaft washer, and a front and back foot.
Stuffing Box / Sleeve : The cast stuffing box is used to close the rear of the elbow and provide a mounting surface for a mechanical seal or gland. The stuffing box is cast and is separate from the elbow. It comes with a replaceable wear sleeve. Included are 5 to 7 rings or packing and a lantern ring to seal the shaft area. Two flush ports provide packing lubrication. A gland is used for packing adjustment. The stuffing box can also be modified to accept a mechanical seal if required.
