A specification tells a supplier what the equipment must do, where it will work and what documents must come with it. A clear specification is the fastest way to an accurate quotation, and the best protection against receiving the wrong item.
Start with the duty, not the model
Describe what the equipment has to achieve: the flow and head for a pump, the load and lift height for a hoist, the throughput for a mill or a packing machine. A model number is useful as a reference, but the duty lets a supplier offer an equivalent if that model is unavailable.
Describe the site
- Power supply: voltage, phase and frequency. Three-phase supplies in South Africa are nominally 400 V at 50 Hz.
- Environment: indoor or outdoor, dust, moisture, washdown, ambient temperature range and altitude.
- Hazardous areas: if the equipment will be in a classified zone, give the zone and gas or dust group.
- Space and access: footprint limits, door sizes, floor loading and how the equipment will be moved into place.
State materials and standards
Name the materials for parts in contact with the product or process medium, and the standards the equipment must meet. Examples are a stainless steel grade, a flange standard and pressure class, a motor efficiency class, or a test standard for personal protective equipment.
List the documents you need
- Datasheet and general arrangement drawing
- Material certificates for pressure-containing or product-contact parts
- Test records, such as hydrostatic test or factory acceptance test reports
- Operating and maintenance manual, and a recommended spares list
- Certificates of conformity where a regulation requires them
Give quantity, timing and delivery
Say how many units you need, when they must be on site, and the delivery address. If partial deliveries help, say so. If you have a budget range, sharing it helps suppliers propose suitable options.