





Risk Area | Red Flag | Evidence to Request | Possible Operating Consequence |
Materials | Only general claims; no written specification or traceability | Material specification, applicable test evidence, batch or supplier records | Premature wear, coating damage, shorter service life |
Welded seams | Uneven seams, repeated leaks, no finished-product test evidence | Close-up inspection images, airtightness or pressure-test records | Repair work, pressure loss, module closure |
Connections | Unclear drawings, weak reinforcement, incompatible parts | Approved connection drawing, reinforcement details, installation evidence | Misalignment, local damage, route interruption |
Certification | Logo only; document scope does not match the order | Full certificate/report, scope, model, standard, date, issuer verification | Approval, insurance, or compliance delays |
Factory QC | Generic checklist with no order or batch reference | Incoming, in-process, final-test, and nonconformance records | Undetected defects and inconsistent delivery |
Warranty and support | Vague coverage, no response time, no spare-parts plan | Written warranty, claim process, contacts, response and remedy terms | Longer downtime and disputed costs |
Quotation scope | Price is much lower but inclusions are unclear | Itemized comparison of specifications, testing, accessories, documents, freight, and support | Unexpected costs or missing project-critical items |
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