Model 20 HT/GT Agitators

Our Model 20 HT/GT agitators are designed for a wide range of services in the chemical, pharmaceutical, ethanol and biofuels, water and wastewater, flue gas desulfurization, power, and other general process industries.

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The agitators feature a new, high-efficiency gearbox designed specifically for agitator service. Models are available in right-angle and parallel shaft configurations to meet specific application requirements—from critical chemical reactor systems to routine storage.

Our new agitators combine the proven benefits of the Chemineer HT and GT agitators into a modular design package that reduces the number of replacement parts that need to be carried in inventory by the customer. The Model 20 HT/GT agitators are designed to meet AGMA, OSHA, ANSI, IEC, DIN, EU, and ATEX standards and requirements.

Chemineer Model 20 HT/GT agitators also offer:

ChemSeal
Quick and easy seal change capability that saves time and reduces maintenance costs
Variety of seal options for application versatility
High energy efficiency due to an optimized gear design and lighter weight shaft diameter requirements
Standard cast dry well seal eliminates lubrication oil leakage from gearbox this design is superior to maintenance-intensive, unreliable lip seals
Reversible rotation to meet a variety of process requirements
Reliable performance and long life resulting from the cast gearbox with heavy-duty output shaft and bearings

NSF/ANSI 61 and NSF/ANSI 372 certified
This product is Listed by UL. Representative samples of this product have been evaluated by UL and meet applicable safety standards.

Internal Shafting

Features

Oversized low-speed shaft diameter and short bearing span
Recessed low-speed coupling half

Benefits

Time-proven design to handle shaft/impeller bending loads, reducing deflection and gear misalignment and thereby extending bearing and gear life
Simplifies installation with no requirement to install shaft up through the gearbox

Shaft Design

Both process and mechanical considerations determine shaft design. Shafts are sized to resist torsional loads and bending moments induced by hydraulic forces acting on the impeller as well as to avoid excessive vibration due to the coincidence of critical frequencies and operating speed.
Gearing

Features

Double and triple reduction options
Helical/spiral bevel (HT) and all helical (GT)
Case carburized gearing

Benefits

Double/triple reduction decreases gear loads, lowers noise levels, and allows for nonsynthetic lubrication over competitive single-reduction designs
Highest efficient gearing available reduces energy costs
Reduces wear rate for 20+ years of service life

Housing and Lubrication

Features

Cast gearbox
Dry well seal
Grease and bath lubrication
Standard rust and oxidation oils

Benefits

Modular designs between right angle (HT) and parallel shaft (GT)
Eliminates lubrication leaks that are common in commercial gearboxes with no dry well
Ensures vital lubrication to gears and bearings at all operating speeds, eliminating internal and external lubrication pumps
No synthetic lubrication required, saving installation and maintenance costs

Bearing Design

Features

Tapered roller output bearings; grease lubricated
Tapered roller/roller bearings; oil lubricated

Benefits

High capacity to handle shaft/impeller loads while providing long life
Oil lubrication provides cooler operation, longer life, and lower maintenance over grease or permanently lubricated bearings

Seal Features and Benefits

Features

Drop collar shaft support during seal change
Swing-out or spacer spool seal change designs
Variety of seal options from major mechanical seal vendors such as John Crane, Flowserve, Chesterton, and AES

Benefits

Shaft drops easily by loosening coupling bolts and engages by tightening the coupling bolts
Shaft only drops ½ in., eliminating steady bearing disengagement
No need to pull shaft up through gearbox or in-tank shaft supports

Shafting is straightened to tight tolerances for long seal life and smooth operation less than 0.003 in. total run-out per foot of shaft length (0.25 mm per meter). Custom couplings, impellers, shafts, and steady bearings are available upon request, including sanitary designs.

Types of Shafts

Shafting is supplied in a single-piece design or in rigidly coupled sections for easy installation. For large-diameter shafts, pipe shafting is a viable option, with couplings and impeller hubs welded to the shafting. A wide range of materials and coating options are available.

Couplings

To facilitate assembly in the field, extension shafts are attached to the drive shaft with flanged rigid couplings, eliminating the need for shafts to be installed through the gearbox. Optional in-tank couplings can either be removable tapered bore or welded, simplifying installation of long shafts.

Steady Bearings

Steady bearings are available to help support extremely long shafts. Cup tripod, bracket, and pad-type steady bearings are standard design options.

Extended keyways for adjusting impeller location offer process and design flexibility.

Chemineer Model 20 HT/GT Agitators Brochure (English)
Chemineer Model 20 HT/GT Agitators Brochure (German)
Chemineer Model 20 HT/GT Agitators Brochure (Russian)
Manual 701: Model 20 GT (Case Sizes 21, 22) Double Reduction
Manual 702: Model 20 GT (Case Sizes 21, 22) Triple Reduction
Manual 703: Model 20 HT (Case Sizes 21, 22)
Manual 704: Model 20 GT (Case Size 23) Double Reduction
Manual 705: Model 20 GT (Case Size 23) Triple Reduction
Manual 706: Model 20 HT (Case Size 23)
IO&M Manual 711.03: 20 GTN/GTNC/GTNS, 20 HTN/HTNC/HTNS
IO&M Manual 712.01: 20 GTA/GTL/GTNT, 20 HTA/HTL/HTNT
IO&M Manual 713.02: 20 GTD/GTP, 20 HTD/HTP
IO&M Manual 731.02: 20 GTN and HTN SpacerSpool
Supplemental IO&M Manual 740: 21 GTA/GTL/GTNT Angle Mount
IO&M Manual 415.01: GTD/GTP Style Agitators
Manual 415.1: GTD/GTP Supplement1 - Mounting
Manual 415.2: GTD/GTP Supplement2 - Angle Mounting
IO&M Manual 416.01: GTA/GTL/GTNT Style Agitators
Manual 416.2: GTA/GTL/GTNT Supplement2 - Angle Mounting
IO&M Manual 417.01: GTN/GTNC/GTNS Style Agitators
Manual 420.01: GT Gear Drive Case Sizes 1, 2, 3, 4 Double Reduction
Manual 421.01: GT Gear Drive Case Sizes 3, 4 Triple Reduction
Supplement CT/GT Conversion

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