# Mixing & Blending — RFQ template & spec checklist

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Mixing and blending equipment ranges from tank-mounted agitators and high-shear rotor-stator units to ribbon and paddle blenders for dry powders and inline static mixers for continuous liquid streams. Plants usually shop this category when a new formulation needs different tip speeds, when batch sizes change, or when an existing gearbox or shaft seal has failed. Because a mixer's suitability is tied to viscosity, shear sensitivity, and whether solids have to be wetted out, two vendors can propose very different geometries for the same duty. Competing quotes let you compare impeller design, motor sizing, and CIP provisions side by side rather than accepting the first drawing that lands.

## What to include in your request
- [ ] Batch or continuous operation, with working and maximum volume in liters or gallons
- [ ] Product viscosity range in cP at process temperature, and whether it is shear-sensitive or shear-thinning
- [ ] Bulk density and particle size for dry blends, plus a target blend uniformity or CV%
- [ ] Wetted materials (316L, elastomer grades) and product-contact surface finish in Ra microinches
- [ ] Whether 3-A or EHEDG hygienic design is required for the wetted mixer
- [ ] Utilities: motor voltage and phase, plant air pressure, and headroom above the tank for a top-entry drive
- [ ] Mounting style: top-entry, side-entry, bottom-entry, or portable

## What drives the quote
- Motor power and the gear reducer service rating
- Wetted-part metallurgy and surface finish
- Hygienic certification and documentation (3-A, EHEDG, material certificates)
- Explosion-proof or ATEX motor and controls for dusty or solvent-laden duty
- Tank fabrication, jacketing, and mounting hardware if the mixer is quoted as a package

## Common spec mistakes to avoid
- Sizing the motor on volume alone and ignoring viscosity at the coldest expected temperature
- Asking for a single fixed speed when the process actually needs a VFD turndown range
- Leaving shear sensitivity unstated, so a supplier proposes a high-shear head that damages the product
- Overlooking vessel headroom and floor-to-ceiling clearance needed to pull the drive for service
- Treating dry-blend uniformity as a given without naming a CV% target or a sampling method

## Lead time
Lead time depends heavily on whether the unit is a catalog agitator or a custom-engineered drive paired with a fabricated tank. Special metallurgy, ATEX-rated motors, and third-party hygienic certification each stretch the schedule further.

## Anonymity
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