Sea valve inspection checks the confirmed specification, applicable standard, material and trim, pressure-test condition, marking, certificate scope, and release documents. It may cover material review, production witness points, pressure testing, final inspection, or pre-shipment checks. The nominated society or agency, inspection scope, witness stage, release condition, and required documents are confirmed during technical review and before production.
This guide applies to marine valve procurement and technical review. It explains how certificate scope, inspection stages, and delivery documents are checked against the confirmed product standard, drawing, project specification, and order. It does not replace a product standard, classification-society rule, ship specification, approved drawing, or the certificate itself.
A marine-valve certificate is not judged by product category alone. The certificate requirement, product standard, model, materials, size, pressure-temperature boundary, and order inspection arrangement should be checked line by line.
| Check dimension | What to confirm |
|---|---|
| Society or agency | Name, certificate type, inspection authorization route, and whether the customer nominates it |
| Product and model | Valve type, body type, model or drawing reference, rather than a family name only |
| Standard and size | Product standard and size range, including whether DN, NPS, or A/B sizes fall within the covered scope |
| Materials and trim | Body, bonnet, disc, seat, stem, sealing parts, and trim match the documented scope |
| Pressure and temperature | Pressure class, temperature boundary, and service medium, without automatic extension to other duties |
| Marking and order references | Product marking, package marking, packing list, and purchase-order references can be matched to the delivered items |
The fastest check is to compare the exact order with the document requirement: model or drawing, size, material, pressure-temperature boundary, society or agency, certificate type, holder, validity, and any order survey. This avoids the two practical delays: quoting a valve outside the approval scope, or treating a type approval as an order certificate.
Inspection scope is defined by product and order and may cover one or more stages. Customer-nominated witness points, release conditions, and document requirements should be defined before production so a missing step is not discovered after completion.
| Stage | Common checks |
|---|---|
| Material review | Material grade, material certificate, chemical and mechanical results, and product coverage |
| During production | Critical dimensions, assembly condition, process records, and order-required witness points |
| Pressure test | Test basis, test condition, result, and traceable valve identification |
| Final inspection | Appearance, marking, nameplate, specification match, trim condition, and pre-packing condition |
| Pre-shipment check | Quantity, packing list, marking record, protective packing, and release documents |
The final package follows the confirmed order scope. Common items include an EN 10204 3.1 material certificate, pressure-test records, packing list, marking record, and an inspection or class certificate where required. Check issuing party, coverage, language and purchase-order reference together; a material certificate, type approval, test record and order survey answer different questions and are not interchangeable.
Before acceptance, the certificate, test record, marking, packing list and purchase-order references should form one traceable set. A document that cannot be connected to the delivered item is treated as an open point rather than assumed to be acceptable.
| Question | Answer |
|---|---|
| What does sea valve inspection include? | Sea valve inspection checks the confirmed specification, applicable standard, material and trim, pressure-test condition, marking, certificate scope, and release documents. It may cover material review, production witness points, pressure testing, final inspection, or pre-shipment checks. The nominated society or agency, inspection scope, witness stage, release condition, and required documents are confirmed during technical review and before production. |
| How are classification-society certificate requirements handled? | Certificate application is arranged per confirmed product and order. Common requirements include ABS, BV, CCS, DNV, KR, LR, NK, RINA, RS, and PRS; legacy GL references may also be reviewed for project acceptance. Society, product scope, certificate type, marking, and timing must be confirmed before production. |
| How is a nominated classification society or third-party inspection agency handled? | Customer-nominated classification societies and third-party inspection agencies are acceptable. The agency, inspection scope, witness stage, authorization route, release requirement, and schedule are confirmed with the order plan. |
| What is the difference between a manufacturer type approval and a per-order survey record? | A type approval or manufacturer certificate has a defined product, size, material, pressure and standard scope. A per-order survey record or class certificate is issued against the confirmed order and inspection arrangement. One does not automatically replace the other. |
| What does class certified mean for a marine valve? | Class certified answers the order only after the exact valve and document requirement are compared: society or agency, certificate type, holder, model, size, material, pressure-temperature boundary, validity and any order survey. It is not a catalog-wide or supplier-wide status. |
| Which mismatches make a marine valve certificate inapplicable? | Do not use the certificate if the model, size, material, pressure class, temperature boundary or standard is outside its scope; the holder differs; the approval is expired or withdrawn; the order requires a separate survey or certificate; or delivered marking and references cannot be traced. Resolve the mismatch before release. |
| What is included in an EN 10204 3.1 MTC? | An EN 10204 3.1 material certificate is issued by the manufacturer's authorized inspection representative. It normally identifies the material grade and product, with chemical and mechanical results within the applicable specification. Its exact content and product coverage are confirmed by product and order; it is not a class certificate. |
| What additional documents can be requested: PMI, NDT, pressure-test record, packing list, or marking record? | These documents can be requested, but scope and feasibility are confirmed before production. PMI verifies alloy chemistry, NDT covers defined surface or internal examination, pressure-test records identify the test basis and result, while packing and marking records connect documents to delivered items. |
| What should be checked for an EN 10204 3.2 material certificate? | EN 10204 3.2 involves a signature route with the purchaser's authorized representative or nominated inspection agency. Signatories, inspection scope, product identification, and whether the order can support the required inspection arrangement should be confirmed before production. |
| Which fields should be verified on a marine valve certificate? | Verify the society or agency, certificate type, holder, product or model scope, governing standard, size and material, pressure range, validity, marking requirement, and order reference, then match those fields to the exact products being purchased. |
| Why are marking and packing lists part of inspection documents? | Marking and packing lists connect certificates, test records, delivered items, and purchase orders. If marking is missing or references do not match, individual documents may not prove that they apply to the delivered products. |
| When should certificate and inspection requirements be raised? | During technical review, before quotation and production. They affect the manufacturing route, witness points, document package, and delivery schedule. |
To apply this reference to a specific order, provide the product list, nominated society or agency, document package and inspection stage.
