Centrifuges
How a Decanter Works
The centrifuge is fed through a stationary pipe, which is inside a hollow shaft connected to the screw conveyor (scroll.) There it enters a feed compartment (inside of the conveyor) and is accelerated through feed slots into the inside of the bowl. Once inside the bowl, centrifugal forces accelerate the solids. They are then collected on the inside diameter bowl wall and the liquid forms a concentric annulus and fills the bowl to the level of the effluent dam/weirs.
The screw conveyor, which is connected through a coupling to a gearbox, turns slightly slower than the bowl. Since it is turning slower and the helix is angled toward the small diameter (conical end) the solids are then conveyed along the inside diameter of the bowl to the solids discharge end.
The liquid flows around the screw conveyor and exits through effluent dam/weirs located on the large diameter (cylinder) end of the bowl. Solids, which do not settle to the inside diameter of the bowl (floaters), are carried out with the liquid through the effluent weirs.
Effluent dams/weirs that are adjustable control the amount of liquid inside the bowl. The maximum volume (pool) forms an annulus diameter, which is smaller than the solids discharge diameter.
Models
HH1448
Maximum Rated Capacity 225 GPM
Minimum temperature: 30F
Maximum temperature: 212F
Recommended throughput:
MUD weight 13 PPG: 30 GPM
MUD weight 11 PPG: 60 GPM
MUD weight 10 PPG: 100 GPM
Recommended settings:
MUD weight 13 PPG: 30 GPM
MUD weight 11 PPG: 60 GPM
MUD weight 10 PPG: 100 GPM
Barite recovery RPM: <2250 RPM
Conveyor diffrential: 42 RPM
G-force: 1000 G
Polishing RPM: 3250
Conveyor differential: 61 RPM
G-force: 2100 G
Run up time: 5 minutes
Run down time: 15 minutes
Maximum RPM allowed: 4000 RPM
Bowl
Diameter: 14\”
Length: 48\”
Conical section: 10degree
Conveyor pitch: 4\”
Gear Box
Ratio: 1:52
Torque: 22000 lbs
Shipping Data
Net weight: 4500 lbs
Gross weight: 5200 lbs
Volume: 128 cu. ft.
HH5500
The HH 5500 Standard is a configuration of a drive system for a Decanting centrifuge. This configuration is the most basic of many available configurations. The Centrifuge bowl is driven by a main drive motor and the conveyor is driven through a planetary gear box with a simple torque arm setup. The torque arm is torque limiting device to protect both gearbox and conveyor against mechanical overload. The conveyor speed is simply the Bowl RPM reduced by the gearbox ratio.
Maximum Hydraulic Capacity 230 GPM
Minimum temperature: 30F
Maximum temperature: 212F
RPM standard step sheave: 2,000 & 3,050 RPM
Run up time: 8 minutes
Run down time: 20 minutes
Materials:
Bowl: AISI 316
Conveyor body: AISI 316
Base: Cast iron
Cover/Case: SS 316
Paint: Epoxy
Conveyor tips: Tungsten Carbide
Solids discharge: Tungsten Carbide
Feed nozzles: Tungsten Carbide
Bowl
Diameter: 16\”
Length: 55\”
Conical section: 10°
Conveyor pitch: 4.25\”
Gear box
Ratio: 53:1
Torque: 36,000 lb-f/in.
Shipping Data
Net weight: 8,200 Lbs
Electrical Requirements
Main Motor: 60 HP
Full Load Amps: 72 (460V, 3ph., 60Hz)
CSC18
Performance
Max Bowl Speed: 3,460 rpm
Rate Flow Capacity: 325 gpm
G-Force: 2246 G’s @ 3,000 rpm
Bowl
Diameter: 17.6” (447mm)
Length: 74.5” (1,892.3mm)
Beach Angle: 2.5° – 6° – 8.5°
Solids Discharge: 360°
SS2000
Performance
Max Bowl Speed: 2,700 rpm
Max Centrifugal Force: 3,050 gpm
Rate Flow Capacity:660 Gal/Min
Unweighted Drilling Mud:528 gpm
G-Force: 2774 G’s @ 3,050 rpm
Bowl
Material: Stainless Steel
Rotating Assembly: 21\”x72\”/125 hp (533 x 1829 mm)
Weight: 16,300 lbs (7,400 kg)
Beach Angle: 5°
Solids Discharge: 90°