Food-Grade Gear Pump
Chocolate, honey, syrup, vegetable oil, cocoa butter and glycerin production demands 316L stainless pumps with food-grade elastomers, smooth surface finish and very low shear to preserve texture, color and sensory properties. FB Bombas serves bulk industrial transfer of these fluids with FBE and FBEI from DN 1/2" to 3", API 676 compliant, manufactured in Cabreúva, Brazil.
What pump to use for chocolate, honey and syrups?
For bulk industrial transfer of chocolate, honey, syrups, molasses and vegetable oils, the recommended pump is the gear pump in 316L stainless steel (ASTM A743 CF8M) running at low speed. FB Bombas supplies FBE and FBEI with food-grade elastomers and a heating jacket when the product requires it. Operation up to 80 °C, self-priming. For the certified sanitary segment (3-A, CIP/SIP), we recommend specialized manufacturers.
Is the pump suitable for food contact?
For food-grade industrial processing, yes: FB Bombas supplies FBE and FBEI in 316L stainless with food-grade elastomers (PTFE, food-grade EPDM and Viton) and smooth surface finish in contact zones, accompanied by a 3.1 raw-material certificate (EN 10204). Important: these are not 3-A certified sanitary pumps — dairy and beverage lines with automated CIP/SIP are a segment for specialized manufacturers.
Why gear over centrifugal for viscous foods?
Chocolate, honey and syrups have viscosity between 50 and 5,000 cP — a range where centrifugals lose efficiency drastically. Furthermore, centrifugals shear the product due to high vane speed, separating ingredients (chocolate fat, honey water) and generating aeration. Gear pumps operate at low rotation with laminar flow, preserving texture and quality.
Viscous food fluid profiles
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 strict process-hygiene requirements. Glycerin (E422) ranges from 950 cP pure to 200 cP in 70% solution, is hygroscopic and requires smooth surfaces and inert material. In all these cases, FBE in 316L stainless with food-grade elastomers and smooth surface finish is the correct technology for bulk transfer — combining high viscosity with food-grade requirements.
- Liquid chocolate (40-50 °C) — 2,000 to 20,000 cP, thixotropic, jacketed stainless 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 food-grade mechanical seal
- HFCS, glucose, inverted sucrose syrups — 500-5,000 cP, stainless FBE
- Vegetable oils (soybean, palm, olive) — 50-350 SSU, food-grade 316L stainless FBE
- Food-grade glycerin E422 — 200-950 cP, stainless FBE with smooth interior finish
316L stainless steel and the bulk × sanitary boundary
Stainless steel in food pumps is a regulatory requirement: Anvisa (RDC 91/2016 and related acts) establishes that surfaces in direct product contact must be made of inert, non-corrosive material with no metallic-ion leaching. 316L stainless (ASTM A743 CF8M) contains molybdenum that increases chloride resistance (present in many processed foods) compared to 304 — which is why it is FB's standard specification for food contact. A distinction that saves the specifier money and rework: a bulk industrial pump is not a sanitary pump. FB Bombas serves bulk industrial transfer — oil refining, cocoa mass, chocolate, syrups, glycerin — with FBE and FBEI in 316L stainless, smooth machined surface finish in contact zones, clearances matched to the fluid and no sharp corners where product can stagnate. What FB does not supply is the 3-A Sanitary Standards certified design (drain-free, zero dead spots, hygienic Tri-Clamp connections, CIP/SIP integration) required in dairy and bottled beverages — that segment belongs to specialized manufacturers, with distinct products and certifications. Sealing is the critical point of bulk food service. The type 21 mechanical seal uses silicon carbide × ceramic faces, 316 stainless spring and food-grade elastomers (PTFE, 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 maintenance.
Specific case: chocolate pump
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 316L stainless, with hot-water jacket (45-50 °C) or thermal oil at 55 °C, 400-800 rpm rotation via reducer, mechanical seal with food-grade elastomers 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.
Cleaning, product changeover and traceability
Food factories operate discontinuous production with product changes (e.g., dark chocolate → milk chocolate → white chocolate) requiring strict cleaning between batches. In the bulk transfer served by the FBE, cleaning is done by flushing with the hot product itself or a cleaning solution, followed by scheduled disassembly when the plant's hygiene plan requires inspection — the FBE design gives access to the gears without removing the pump from the piping. 316L stainless withstands the alkaline (1-2% NaOH) and acid (0.5-1% HNO₃, H₃PO₄) solutions used in these cycles. Lines requiring integrated CIP (Clean-in-Place) without disassembly and SIP (steam sterilization at 121 °C) — infant food, UHT dairy, aseptic products — call for a 3-A certified sanitary pump with drain-free design, which is the territory of specialized manufacturers. Specifying a bulk pump for that service is a design error; specifying an expensive sanitary pump to transfer crude vegetable oil is waste. The correct boundary saves capex and audit effort. Material traceability is a growing regulatory requirement. FB Bombas provides a 3.1 raw-material certificate (EN 10204) with chemical analysis of the 316L casting lot, composing the conformity dossier the customer presents to regulators or importers. The Cabreúva plant maintains lot-by-lot traceability in the production system.
FB Bombas in the Brazilian food industry
FB Bombas supplies 316L stainless gear pumps to Brazilian manufacturers of chocolate, candy, confectionery, food-based cosmetics (glycerin), industrial syrups and refined vegetable oils — the bulk industrial segment of the food chain. Each pump is delivered with a 3.1 raw-material certificate (EN 10204) and, when requested, hydrostatic and flow tests witnessed by an FB engineer. The main competitive advantage versus imports (Viking, food-grade Maag, Waukesha Cherry-Burrell) is lead time and total cost. An FBE 1.1/2" in 316L stainless with heating jacket, motor and complete baseplate assembly is delivered in 35-50 days versus 5-7 months for imported alternatives. Critical spare parts (mechanical seal, gears, shafts) are kept in permanent stock in Cabreúva, Brazil, with delivery within 72 hours for emergencies. The factory receives quality audits from food-sector customers and maintains lot-by-lot traceability of contact materials. For the certified sanitary segment (dairy, bottled beverages, aseptic lines), the honest recommendation is a manufacturer specialized in 3-A pumps — FB is the right choice when the service is bulk industrial transfer of viscous food fluids. For direct technical consultation: comercial@fbbombas.com.br or +55 11 4898-9200.
Frequently Asked Questions
Which pump to use for transferring liquid chocolate in the factory?
FBE 1" to 2" in 316L stainless, with hot water jacket at 45-50 °C or thermal oil at 55 °C, rotation between 400 and 800 rpm via reducer, mechanical seal with food-grade elastomers and 2-7.5 HP motor. This configuration covers from fluid coating chocolate (3,000 cP) to complex molding chocolate (20,000 cP). Operating above 900 rpm heats the mass via shear and compromises crystallization — staying within 400-800 rpm is a rule.
Does FB Bombas provide food-contact documentation for its products?
FB provides the 3.1 raw-material certificate (EN 10204) from the casting lot and the full specification of contact materials (316L stainless per ASTM A743 CF8M, food-grade elastomers) — documentation that composes the conformity dossier the customer presents to regulators, auditors or importers. FB does not issue sanitary (3-A) or FDA certification — FB pumps serve bulk industrial service; regulatory conformity assessment of the process belongs to the customer, based on the supplied material certificates.
Does the stainless FBE withstand caustic soda (NaOH) cleaning?
The material, yes: 316L stainless withstands 1-2% NaOH up to 80 °C and acid solutions (0.5-1% HNO₃, H₃PO₄) at typical industrial cleaning concentrations. But mind the design: the FBE is not a sanitary pump with integrated CIP (3-A drain-free design) — recommended cleaning is flushing followed by scheduled disassembly per the plant's hygiene plan. Lines with daily automated CIP/SIP require a certified sanitary pump from a specialized manufacturer.
Can I pump honey without heating?
Theoretically yes, but honey viscosity at 20 °C reaches 10,000 cP, requiring very low rotation (300-500 rpm) and oversized motor — making the assembly expensive. Industrial practice is to heat honey to 40-50 °C before filling (viscosity drops to 500-1,500 cP), which allows FBE 1" to 2" with direct coupling and commercial flow of 500-3,000 L/h. Warning: do not exceed 60 °C in honey, otherwise enzymes degrade and hydroxymethylfurfural (HMF) rises above the regulatory limit.
Is there a difference between 304 and 316 stainless in food pumps?
Yes, and relevant. 316 stainless contains 2-3% molybdenum that increases chloride resistance (present in fruit juices, pickles, soy sauce, seasonings, seafood and cheeses). 304 can suffer pitting (localized corrosion) in prolonged contact with chlorides above 200 ppm, generating product contamination. For most industrial food applications (chocolate, syrups, oils), 316 is the FB Bombas standard specification.
How long does the sanitary seal last in continuous operation?
For chocolate, syrups and vegetable oils in continuous operation, the food-grade mechanical seal has typical service life of 12 to 24 months. In more severe applications (heated honey, concentrated pastes, products with high chlorides), life drops to 8-15 months. FB keeps permanent stock of replacement seals in Cabreúva, Brazil, with delivery within 72 hours for emergencies — replacement done in 30-60 minutes without opening the full casing.
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