| 01 | Applicable Design Standards | The manufacturer should design and size valves according to recognized standards such as API 520, API 526, API 527, ISO 4126, or an applicable national standard. | Design certificates, sizing calculations, standard editions used, and a technical compliance matrix. | 15% | Critical |
| 02 | Pressure and Temperature Range | Confirm that the available pressure classes, set-pressure range, back-pressure capability, and temperature limits cover the actual process envelope with an engineering margin. | Pressure-temperature charts, certified set-pressure range, allowable back-pressure data, and application review records. | 14% | Critical |
| 03 | Material Compatibility | Wetted materials should be compatible with the fluid, corrosion mechanism, temperature, pressure, and any sour-service requirement. Common choices include carbon steel, stainless steel, nickel alloys, and specialized trim materials. | Material certificates, trim specifications, corrosion-resistance documentation, and sour-service compliance where required. | 12% | Critical |
| 04 | Certification and Market Access | For international projects, the supplier should support the certifications required in the destination market, including pressure-equipment, hazardous-area, quality, and material-traceability requirements. | Valid certificates, conformity declarations, notified-body information where applicable, and certificate scope verification. | 12% | Critical |
| 05 | Testing and Quality Control | A dependable supplier should perform documented shell, seat-leakage, functional, set-pressure, dimensional, and visual inspections appropriate to the valve design and purchase specification. | Inspection and test plans, calibrated equipment records, test reports, non-conformance procedures, and sample inspection dossiers. | 14% | Critical |
| 06 | Engineering and Sizing Support | The supplier should be able to evaluate fluid phase, relieving scenarios, required capacity, inlet and outlet losses, built-up back pressure, and installation conditions. | Completed sizing worksheets, process-data checklist, engineering review comments, and installation recommendations. | 10% | High |
| 07 | Product Configuration | Compare spring-loaded, pilot-operated, bellows-sealed, conventional, balanced, soft-seat, and metal-seat configurations according to service conditions rather than price alone. | Product catalogues, sectional drawings, option lists, elastomer data, and service-specific configuration recommendations. | 8% | High |
| 08 | Documentation and Traceability | The supplier should provide a complete manufacturing record with serial-number traceability from raw material through testing, final inspection, preservation, and shipment. | Material certificates, weld records, heat-treatment records, inspection reports, calibration certificates, manuals, and nameplate data. | 8% | High |
| 09 | Delivery and Supply Capability | Evaluate realistic production capacity, component availability, export packaging, logistics experience, and the supplier’s ability to manage repeat orders and project schedules. | Production schedule, confirmed lead time, capacity statement, shipping records, packaging specification, and escalation contacts. | 4% | Medium |
| 10 | After-Sales Service and Total Cost | Select the supplier offering dependable spare parts, repair guidance, inspection support, warranty terms, lifecycle service, and transparent total cost of ownership. | Warranty policy, spare-parts list, service response process, maintenance manual, training options, and lifecycle cost breakdown. | 3% | Medium |
