Direct answer
Put furnace-part acceptance criteria in the purchase order by referencing the approved drawing and revision, naming critical dimensions and interfaces, defining the required inspection records, and stating how deviations will be reviewed. Include the part identity, sample or drawing basis, visual-condition expectations, packaging, and document-delivery requirements. Do not invent a universal limit; acceptance should follow the buyer’s application and the written agreement with the supplier.

Name the functional requirements
List the envelope, supports, rail or roller interfaces, shafts, connections, locating features, lifting points, or other dimensions that control installation and use. Identify the datums. If a dimension is reference-only, label it that way. This prevents a supplier from treating a functional interface like a general visual dimension.
Define the evidence package
Specify whether the buyer requires dimensional measurements, photographs, visual inspection, material or process records, or another agreed check. Name the report format and the parts or features to be recorded. If a special examination is required, define it before production and confirm that both parties interpret it the same way.
Define deviations and change control
State who may approve a deviation, how it is recorded, and whether a drawing change requires written approval. Link the inspection report and any deviation record to the same drawing revision.

How ECOOSUN can help
ECOOSUN can review the drawing, sample, engineering requirements, and inspection requirements before a custom casting quotation is finalized. Use the relevant product page, such as Radiant Tubes, or contact-us.

FAQ
What should a buyer confirm for a heat-resistant cast furnace part requirement?
Confirm the drawing or used sample, key dimensions and interfaces, furnace type and clearance, load, operating cycle, failure evidence and inspection requirements. Final acceptance criteria should be agreed for the specific project.
Can ECOOSUN review a custom heat-resistant cast furnace part requirement?
Yes. ECOOSUN can review a customer drawing or used sample and discuss casting, laboratory and inspection requirements for a custom furnace-component project. Suitability and final scope are confirmed from the supplied information.