Process duty
State whether the task is blending, suspension, powder incorporation, emulsification, let-down, adjustment, holding or a defined combination.
Mixing-tank specification / RFQ guide
A mixing-tank RFQ should describe the batch, not only the volume.
A useful request follows the material from first charge to final drain. It tells the supplier what the tank must do, how the batch changes and which interfaces belong inside the proposal.
01 / Container inputWorking quantity and vessel geometry
02 / Process inputDuty, rheology and addition sequence
03 / Plant inputTransfer, utilities, controls and cleaning
Before hardware selection
Separate what the tank contains from what the tank must accomplish.
A vessel can support several stages in one batch. Naming each duty and endpoint makes the agitation, thermal, connection and cleaning questions visible.
Batch behavior
Describe viscosity change, settling, foaming, shear or heat sensitivity and what happens during each addition.
Supply boundary
List the vessel, agitation, thermal interfaces, fittings, transfer, instruments, controls, access and documents expected in the proposal.
RFQ writing route
Write the process sequence before listing tank options.
A charge-to-drain narrative exposes decisions that a volume-only enquiry misses.
01→
Set the starting state
Record the initial liquid level, material condition and minimum operating quantity.
02→
List every addition
State order, form, location, timing and the expected change in the batch.
03→
Define the endpoint
Explain how the batch is judged ready for its next destination.
04
Close the cycle
Describe discharge, product recovery, cleaning, inspection and the next batch.
Mixing-tank RFQ checklist
Copy these sections into the enquiry.
Keep each answer tied to its source. If a value is not known, identify who will confirm it and what decision depends on it.
Open the process brief- 01Material & rheology
Components, solids, density if known, viscosity across the batch, settling, foaming and sensitivities.
- 02Batch window
Minimum, normal and maximum working quantities, headspace needs and campaign pattern.
- 03Mixing duties
Required motion or process result at each stage, including the final acceptance condition.
- 04Temperature & pressure state
Starting and target temperatures, heating or cooling purpose, and whether the process is atmospheric, vacuum or pressure-defined.
- 05Vessel & plant interfaces
Space, support, access, additions, connections, discharge route, utilities, instruments and controls boundary.
- 06Cleaning & documentation
Changeover method, drainability, product recovery, inspection access and required project documents.
Buyer decision FAQ
A better tank quotation begins with a better process description.
What is the minimum information for a mixing-tank RFQ?
Provide the material and its behavior, working batch range, mixing duties, addition sequence, endpoint, temperature purpose, pressure state, transfer route, cleaning method, utilities and controls boundary.
Why is tank volume alone not enough?
Volume describes capacity, but it does not define circulation, suspension, shear, heat-transfer support, additions, drainage or the way viscosity changes during the batch.
What if viscosity changes during the process?
Record the known or expected range by process stage, along with temperature and shear conditions used for the measurement. The changing batch is more useful than one isolated value.
When should the term reactor appear in the RFQ?
Use it only when the vessel supports a defined controlled reaction, and state the actual process conditions and design basis. The word alone does not establish pressure, temperature, code or safety scope.