Food-Grade Gear Pump

Viscous food fluids operate in distinct viscosity ranges and require specific pump configurations. Liquid chocolate, in conching and molding, operates between 40 °C and 50 °C with apparent viscosity from 2,000 to 20,000 cP — non-Newtonian thixotropic product, very sensitive to shear (which can heat the mass above the fat melting point and alter final texture). Pure cocoa butter operates at 45-55 °C with 80-150 cP, simple Newtonian-fluid range. Honey and molasses have viscosity between 2,000 and 10,000 cP at 20 °C, dropping to 300-1,500 cP when heated to 40-50 °C to ease filling. They contain moisture above 17% and are highly hygroscopic — any ferrous component contaminates color and flavor. Syrups (glucose, inverted sucrose, high fructose HFCS) operate between 500 and 5,000 cP at 30-60 °C, also sensitive to iron and microbial contamination. Food-grade vegetable oils (soybean, palm, sunflower, canola, olive) are between 50 and 350 SSU at 25 °C — low viscosity but with absolute sanitary requirements. Glycerin (E422) ranges from 950 cP pure to 200 cP in 70% solution, is hygroscopic and requires strict sanitary finish. In all these cases, FBE in AISI 316 stainless with Ra ≤ 0.8 µm finish and sanitary sealing is the correct technology — the only one that combines high viscosity with food-grade requirements.

• Liquid chocolate (40-50 °C) — 2,000 to 20,000 cP, thixotropic, jacketed sanitary FBE
• Pure cocoa butter (45-55 °C) — 80-150 cP, Newtonian, FBE 1" to 2"
• Honey / molasses (40-50 °C heated) — 300-1,500 cP, stainless FBE with sanitary seal
• HFCS, glucose, inverted sucrose syrups — 500-5,000 cP, stainless FBE
• Vegetable oils (soybean, palm, olive) — 50-350 SSU, sanitary FBE FDA
• Food-grade glycerin E422 — 200-950 cP, stainless FBE with Ra ≤ 0.8 µm finish

AISI 316 stainless steel (ASTM A743 CF8M) is a regulatory requirement for food pumps: Anvisa (RDC 91/2016 and related acts), ABNT NBR 13177 and international 3-A Sanitary Standards and FDA 21 CFR 177 establish that surfaces in direct product contact must be made of inert, non-corrosive material with no metallic-ion leaching and with a finish that does not harbor biofilm. Stainless 316 contains molybdenum that increases chloride resistance (present in many processed foods) compared to 304. Sanitary finish is as important as material. Surfaces with Ra ≤ 0.8 µm roughness (3-A industrial classification) prevent bacterial adhesion and allow effective CIP cleaning. The FB Bombas sanitary FBE is supplied with 316 stainless casing and gears, electropolished finish on product-contact surfaces (Ra ≤ 0.8 µm), triclamp or SMS connections per specification and absence of sharp corners or recesses where product can stagnate. Sanitary sealing is the critical point. The sanitary type 21 mechanical seal uses silicon carbide × food-grade ceramic faces, 316 stainless spring and FDA elastomers (food-grade EPDM or food-grade viton, per product). For chocolate and cocoa butter, sealing typically operates at 45-55 °C; for heated honey and syrups, 50-70 °C; for vegetable oils and glycerin, ambient temperature. In all cases, the seal is replaceable without opening the casing, speeding scheduled cleaning.

Liquid chocolate is the most technically challenging food fluid to pump. It is a system composed of solid sugar crystals (30-50% by mass), solid cocoa particles (10-20%), powdered milk in milk chocolates (10-25%) and a continuous phase of liquid cocoa butter. Apparent viscosity at 45 °C varies from 3,000 cP (fluid coating chocolate) to 20,000 cP (chocolate for complex molding), thixotropic behavior (decreases with shear) and 50-250 Pa yield stress. Three common errors destroy chocolate pumps in Brazilian factories. First, specifying a pump without heating jacket: mass temperature must stay above 40 °C (cocoa butter melting point) during the entire transfer; a cold casing crystallizes product inside the pump and locks the rotor on next start. Second, using centrifugal or piston pump: centrifugal has unacceptable efficiency above 3,000 cP, and piston generates pulsation that damages fine crystallization during tempering. Third, operating above 900 rpm: high shear heats the mass via viscous dissipation and breaks crystalline structure. Correct specification is FBE 1" to 2" in AISI 316 stainless, with hot-water jacket (45-50 °C) or thermal oil at 55 °C, 400-800 rpm rotation via reducer, FDA sanitary mechanical seal and 2 to 7.5 HP motor per flow and pressure. This configuration is standard in fine chocolate plants, industrial coatings, fillings and confectionery chocolate.

Food factories operate discontinuous production with product changes (e.g., dark chocolate → milk chocolate → white chocolate) that require strict cleaning cycles. Industrial standard is CIP (Clean-in-Place) without disassembly: sequential circulation of warm water, alkaline solution (1-2% NaOH), rinse, acid solution (0.5-1% HNO₃ or H₃PO₄) and final rinse. The sanitary 316 stainless FBE with electropolished finish withstands this cycle without measurable surface degradation. Some processes require steam sterilization (SIP — Sterilize-in-Place) at 121 °C for 15-30 minutes, typical in infant-food, UHT dairy and aseptic-product lines. FBE withstands SIP when specified with temperature-resistant elastomers (food-grade viton in the seal) and bearings with enough clearance for stainless differential expansion. The FBE manual confirms operational temperature up to 350 °C — abundant margin for SIP at 121 °C. Material traceability is a growing regulatory requirement. FB Bombas provides 3.1 raw-material certificate (EN 10204) for every sanitary pump, with chemical analysis of the 316 stainless casting lot. For exports (Mercosur, US via FDA, EU via 2023/2006 regulation), this certificate is mandatory alongside the declaration of conformity. The Cabreúva factory maintains lot-by-lot traceability in the production system.

FB Bombas supplies sanitary pumps to Brazilian manufacturers of chocolate, candy, confectionery, food-grade cosmetics (glycerin base), industrial syrups and refined vegetable oils. The sanitary FBE line is delivered with raw-material certificates, food-contact declaration of conformity and, when requested, hydrostatic and flow tests witnessed by an FB engineer. The main competitive advantage in this segment versus imports (Viking, food-grade Maag, Waukesha Cherry-Burrell) is lead time and total cost. A sanitary FBE 1.1/2" in 316 stainless with jacket, SEW motor and complete skid is delivered in 35-50 days versus 5-7 months for imported alternatives. Critical spare parts (sanitary seal, gears, shafts) are kept in permanent stock in Cabreúva, Brazil, with delivery within 72 hours for emergencies. The factory is regularly audited by food-sector customers (documented internal quality audits, FSSC 22000 traceability when required) and maintains strict separation between sanitary production (stainless, clean environment) and standard industrial production. For direct technical consultation: comercial@fbbombas.com.br or +55 11 4898-9200 — application engineering responds within 24 business hours with complete specification for quotation.