CHEM - high precision gear pump for conveying low to medium viscosity fluids
CHEM gear pump for conveying and metering of fluids with low to medium viscosity. The application range goes from classic transfer and metering tasks in the chemical and pharmaceutical industries up to the conveyance of monomers, oligomers and prepolymers during the production of polymers. Decades of experience in construction and an optimum selection of materials, make this type of pump suitable for even the most demanding tasks and are outstanding in their reliability and metering precision in both vacuum and high pressure applications. Typical areas of application for this type of pump are to be found in the chemical, cosmetic, food, petrochemical and polymer industries.

The CHEM series is also suitable for the food industry, e.g. for conveying butter, margarine or vegetable oils. Pumps of this type can be supplied with or without heating. The WITTE modular construction system for bearings, gears and shaft seals offers a maximum of flexibility for the end customer.

Technical Features
- Housing
Non-alloyed and alloyed steels . tantalum . titanium . Hastelloy . ceramic

- Gears
1.4112 but also all other processable ceramics and metals, e.g. 1.4571, Ferralium, ferro titanite Hastelloy, etc. . with optional surface coating . spur gearing

- Friction Bearings
Carbon . NiAg (nickel-silver) . silicon carbide . zirconium oxide . tool steel . Albronze . special materials . with optional surface coating

- Shaft Seals

Single mechanical seal (ED) . Single mechanical seal with buffer fluid (AD) . Double mechanical seal with buffer fluid (DD) . magnetic coupling, stuffing box, viscoseal

- Heating Systems

Steam . water . heat transfer oil . electrical

Operating Parameters
- Viscosity
0.5 to 10000000 mPas (cP)

- Temperature
Up to 300°C (580° F) . higher temperatures upon request

- Inlet pressure
Vacuum to max. 15 bar (215 psig), higher with magnetic drive

- Conveying Pressure / Differential Pressure
Up to 120 bar (1740 psig)

The values listed are maximum values and must not coincide under certain circumstances.

- Pump Sizes
From 22/6 (1.28 ccm/rev – 20 l/h) to 280/280 (12000 ccm/rev-170000 l/h). Larger sizes available upon request.

Application Examples
- Organic and inorganic chemicals
Alcohols . additives . bases . esters . glycerine . resins . hardeners . isocyanates . monomers . oils . phenol . acids . biodiesel . asphalt . bitumen . tar . hotmelt . glues . waxes . etc.

- Polymers
Celluloseacetate . Nylon 66 . prepolymers . etc.

- Food industry
Vegetable oils . butter . margarine . flavourings . chocolate . fudge . liquorice . chewing gum . vitamins . syrup . gelatine . etc.

- Pharmaceutical and Cosmetic Products

Amino acids . lotions . shampoo . vitamins . etc.

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