| 1 | Engineering and Design Capability | Ability to design coarse screens, bar screens, traveling screens, mechanical rakes, and customized intake systems for the specified flow and debris load. | Hydraulic calculations, structural analysis, site-specific design drawings, and equipment duty specifications. | A complete calculation package covering design flow, channel dimensions, head loss, rake duty cycle, debris conditions, and emergency operation. |
| 2 | Screen and Rake Materials | Material grades, weldability, wear resistance, and suitability for freshwater, wastewater, seawater, or industrial process water. | ASTM A36 or EN 10025 S275/S355 for carbon steel; stainless steel grades such as 304/304L or 316/316L where corrosion resistance is required. | Material certificates should identify grade, heat number, mechanical properties, and applicable standard for all load-bearing components. |
| 3 | Corrosion Protection | Protection system for submerged, splash-zone, outdoor, and chemically aggressive environments. | ISO 12944 for protective paint systems; hot-dip galvanizing requirements may be specified under ISO 1461. | The quotation should state surface preparation, coating system, dry-film thickness, inspection method, repair procedure, and expected service environment. |
| 4 | Hydraulic Performance | Screen opening, approach velocity, through-screen velocity, debris accumulation, and allowable head loss. | Project-specific hydraulic criteria; values must be confirmed by the process engineer because acceptable limits depend on water intake and debris conditions. | Require performance calculations for both clean-screen and partially blocked conditions, including the stated design safety margin. |
| 5 | Mechanical Load and Safety | Rake torque, lifting force, chain or cable capacity, overload protection, emergency stop functions, and structural deflection. | Applicable machinery-safety requirements, structural calculations, motor and gearbox data, and site-specific load cases. | Request documented load testing or factory acceptance testing for the rake mechanism, including overload protection and limit-switch verification. |
| 6 | Automation and Controls | Compatibility with local control panels, PLC systems, remote monitoring, differential-level sensors, and plant communication networks. | Electrical drawings, motor-control requirements, IP protection ratings, sensor specifications, and the buyer's automation protocol. | Controls documentation should include automatic/manual modes, high-level start signals, fault alarms, interlocks, cycle counters, and manual override procedures. |
| 7 | Quality Management and Testing | Control of welding, machining, dimensional inspection, painting, assembly, and final equipment testing. | ISO 9001 quality-management certification; welding quality may be evaluated against ISO 3834 or an equivalent contractual requirement. | The supplier should provide inspection and test plans, weld procedures, inspection records, nonconformance controls, and factory acceptance test reports. |
| 8 | Customization and Installation Fit | Ability to match channel width, water depth, rake angle, bar spacing, discharge arrangement, access restrictions, and lifting requirements. | Approved general arrangement drawings, interface drawings, civil-load data, and installation method statements. | Before purchase, verify all civil interfaces, anchor locations, maintenance clearances, lifting points, drainage needs, and transport dimensions. |
| 9 | Delivery and Global Logistics | Manufacturing capacity, export packaging, spare-parts availability, shipping terms, customs documentation, and installation support. | Incoterms® 2020, packing lists, commercial invoices, certificates of origin, and project delivery schedules. | Compare the confirmed production schedule, shipment dimensions and weights, delivery responsibility, spare-parts lead time, and local service coverage. |
| 10 | Lifecycle Cost and After-Sales Support | Total cost of ownership, energy use, wear parts, maintenance frequency, warranty terms, training, and technical response time. | Lifecycle-cost analysis should include purchase price, installation, electricity, lubrication, replacement parts, downtime, and scheduled maintenance. | Require a recommended spare-parts list, preventive-maintenance schedule, warranty conditions, operating manuals, training plan, and clearly defined service commitments. |