The delivery time for a custom-built industrial mixer does not begin with the first manufacturing step. It encompasses technical clarification, process-engineering design, construction, procurement, manufacturing, assembly, testing, documentation, factory acceptance and shipping preparation. If installation and commissioning are accompanied by the supplier, transport, assembly, utility connections, functional tests and, where applicable, an acceptance test at the site of use are added.

A reliable delivery time can only be agreed once requirements, interfaces, materials, tests, documentation and approvals are sufficiently defined. A mixer with only minor adaptations to an existing product series can be available considerably faster than a customer-specific plant with pressure or vacuum operation, special materials, a heating and cooling jacket, complex automation and extensive qualification documentation.

Indicative values

For near-standard mixers with limited adaptations, delivery times of roughly eight to sixteen weeks are possible. These include, for example, modified connection flanges, an adjusted drive power, additional nozzles, individual measuring points or a modified discharge solution. The precondition is that essential assemblies are available and that no extensive approvals, special materials or elaborate tests are required.

Customer-specific mixers based on proven designs frequently require roughly four to seven months. Typical are adapted vessel geometries, stainless-steel designs, project-specific sealing systems, ATEX designs, additional process connections, automation and extended documentation. The actual time frame is determined in particular by special components, the manufacturer's workload and the speed of technical approvals.

Complex special-purpose plants can require seven to twelve months or longer. These include, for example, very large vessels, highly alloyed materials, pressure and vacuum designs, heating and cooling jackets, high or low temperatures, sterile or particularly hygienic constructions, complex control integration, extensive factory acceptance tests and country-specific approvals. For new process-engineering concepts or complete process plants, the project duration can extend beyond this.

Pressure equipment and assemblies can fall within the scope of the Pressure Equipment Directive 2014/68/EU. Decisive factors include, among others, the maximum allowable pressure, the volume, the fluid group and the specific design. Where the requirements of the directive apply, design, manufacture, testing and conformity assessment must be integrated into the project workflow. This can increase the delivery time and the scope of documentation.

Typical time drivers

Long delivery times frequently result from special materials and semi-finished products that are difficult to obtain. These include thick-walled plate, forgings, special tubing, special flanges, highly alloyed stainless steels, nickel-based alloys or titanium. The machining, welding technology and quality-assured documentation of such materials can likewise take additional time.

Further time drivers are gearboxes, special motors, explosion-protected drive components, frequency inverters, safety controllers, sensors, special sealing systems and vacuum technology. For customer-specific components, procurement time, technical clarification and acceptance testing at the sub-supplier can determine the critical path.

Certifications and evidence must be planned early. These include, for example, requirements for explosion protection, pressure equipment, material certificates, non-destructive testing, surface testing, welding documentation, Factory Acceptance Tests and country-specific approvals. For hygienic designs, constructional requirements must already be taken into account at the planning stage. The EHEDG guidelines describe principles of hygienic design and serve, among other things, as a basis for equipment certification. A hygienic design, however, does not automatically result in EHEDG certification.

Incomplete requirements or late change requests particularly often extend the delivery time. If materials, interfaces, cleaning, automation, the scope of acceptance testing or documentation are changed only after design work has begun, additional engineering loops and, where applicable, new procurement times arise.

Shortening delivery times

The most effective measure is a complete User Requirement Specification or a precise technical requirements document. It should contain product data, bulk density, particle size, moisture, temperature, pressure, vacuum, fill level, batch size, throughput, mixing quality, cleaning strategy, materials, explosion protection, interfaces, automation, documentation and required approvals. The more clearly the requirements are defined at the outset, the less rework arises over the course of the project.

Modular product series and proven standard components reduce design and procurement times. Operators should determine together with the manufacturer which requirements genuinely need a customer-specific solution and which can be met with established components. This applies, for example, to drives, seals, measuring points, operator interfaces, flanges, valves and control components.

A manufacturing-friendly design shortens the throughput time. Available semi-finished products, standardised flanges, proven welded constructions and appropriately defined surface requirements reduce dependence on special suppliers. This must not, however, lead to compromises in product quality, cleanability, safety or regulatory conformity.

Engineering, electrical design, software development and procurement can partly proceed in parallel. This requires clearly defined interfaces and early approval of stable assemblies. This means that, for example, the vessel shell, nozzles or frame can be manufactured while detail questions concerning the operator interface or individual sensors are still being resolved.

Early reservation of critical materials and components can safeguard the delivery date. This applies especially to special materials, gearboxes, motors, seals and electrical components. Operators should transparently decide whether early procurement is approved despite the possibility of later changes.

The scope of testing and documentation must be defined completely but purposefully. Necessary safety and conformity evidence must not be curtailed. At the same time, the operator and the manufacturer can jointly avoid letting unnecessary special tests, additional certificates or multiple acceptance rounds extend the schedule. Material certificates, test methods, FAT scope and acceptance points should therefore be agreed early and on a risk basis.

Approval processes on the customer side are also a decisive scheduling lever. Fixed contacts, clear review deadlines, digital commenting and a binding escalation path for open points prevent delays. Defined response deadlines for drawings, specifications, documents and FAT dates are worthwhile.

Digital tools make coordination easier. Shared document platforms, three-dimensional models, virtual design reviews and early testing of the control logic reduce queries. They do not, however, replace product trials where mixing quality, product protection, cleanability or scale-up need to be demonstrated with the real product.

Factory Acceptance Tests can be organised efficiently through early scheduling, clearly defined test points and, where applicable, digital participation. Remote participation can make scheduling easier, but does not necessarily replace an on-site acceptance test where the operator requires a personal inspection, sampling or binding sign-off.

A shortening of the delivery time by twenty to thirty percent can be possible, but cannot be committed to as a blanket rule. For near-standard plants, clear requirements, modular designs, parallel processes and fast approvals can create considerable time savings. For special materials, complex pressure equipment or extensive approvals, the scope is considerably more limited.

For machinery placed on the market in the European Union from 20 January 2027, the EU Machinery Regulation 2023/1230 applies. Up to and including 19 January 2027, the Machinery Directive 2006/42/EC continues to apply. This transition should be taken into account in the scheduling, documentation and conformity planning of long-term projects.