CN Quality Check
Standards Comparison Tool
EXECUTIVE SUMMARY
Scope: 船用舱底水处理装置 (Marine bilge water treatment units) — the verified identity of GB/T 4795-2023. Both AI drafts misidentified the product (Draft A: FRP water tanks; Draft B: unresolved). The verified standard is a recommended (GB/T) environmental-equipment standard, not a mandatory FRP tank standard. Critical implication: no IDT international equivalent exists; IMO MEPC.107(49) is the governing performance instrument and must be verified separately.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 4795-2023 | 船用舱底水处理装置 (Marine bilge water treatment units) | Shipboard oily-bilge separation & treatment units | Recommended (GB/T) | Current |
| GB/T 1447-2005 | 纤维增强塑料拉伸性能试验方法 (Tensile test for FRP) | FRP tensile test method | Recommended | Current |
| GB/T 1449-2005 | 纤维增强塑料弯曲性能试验方法 (Flexural test for FRP) | FRP flexural test method | Recommended | Current |
| GB/T 2577-2005 | 玻璃纤维增强塑料树脂含量试验方法 (Resin content test for GFRP) | Resin content determination | Recommended | Current |
| GB 3552-2018 | 船舶水污染物排放控制标准 (Discharge standard for ship water pollutants) | Effluent limits (oil ≤15 ppm) | Mandatory (GB) | Current |
| IMO MEPC.107(49) | Revised guidelines for oily-water separating equipment | 15 ppm performance | International instrument | Current |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB/T 4795-2023 | TIER 1 — Product Standard | Defines unit requirements |
| GB/T 1447/1449/2577-2005 | TIER 2 — Test Method | Material test methods |
| GB 3552-2018 | TIER 4 — Discharge/Classification | Effluent limits |
| MEPC.107(49) | TIER 1 — Performance Standard | 15 ppm equipment approval |
⚠️ FLAG: Draft A applied GB/T 1447/1449/2577 (FRP test methods) to a bilge-water unit — misapplication unless the unit's tank is FRP; these are material tests, not unit performance tests.
SCOPE BREAKDOWN
船用舱底水处理装置 (Marine bilge water treatment unit)
Chinese standard: GB/T 4795-2023: 船用舱底水处理装置 (Marine bilge water treatment units)
International equivalent: IMO MEPC.107(49) — 2003 (rev. guidelines) — ⚠️ no IDT; performance-based
Equivalence: NEQ
Standard tier match: Both TIER 1 — valid comparison (performance vs. product)
| Parameter | Chinese Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Oil content in effluent | ≤15 ppm [Verify: GB/T 4795-2023 §effluent] | ≤15 ppm (MEPC.107(49) §3) | identical target | 附加测试后互认 (Mutual recognition after additional testing) | HIGH |
| Alarm at 15 ppm | Required [Verify: GB/T 4795-2023 §alarm] | Required (MEPC.107(49) §4) | identical | 附加测试后互认 (Mutual recognition after additional testing) | HIGH |
| Type approval | CCS type approval [Verify: CCS rules] | Flag-State/RO approval (MEPC.107(49)) | different approval bodies | 不可互认 (Not mutually recognised) | HIGH |
KEY DIFFERENCES SUMMARY
- Standard identity — GB/T 4795-2023 is 船用舱底水处理装置 (bilge water treatment), NOT FRP tanks. Draft A's entire FRP framing is a 🔴 critical error. Impact: HIGH.
- Effluent limit — both target ≤15 ppm; test protocol differs → 附加测试后互认 (Mutual recognition after additional testing). Impact: HIGH.
- Approval route — CCS vs. Flag-State/RO: 不可互认 (Not mutually recognised). Impact: HIGH.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | CCS type approval (船级社型式认可) | Flag-State / Recognised Organisation approval |
| Engineering acceptance | GB 3552-2018 discharge limits | MARPOL Annex I / MEPC.107(49) |
| Import/export compliance | CCIB commodity inspection | Port-State Control (MARPOL) |
| Designer/engineer obligation | N/A for product standard comparison | N/A |
AUDIT FLAG RESOLUTION
- 🔴 CRITICAL CORRECTION: GB/T 4795-2023 = 船用舱底水处理装置 (Marine bilge water treatment units). Draft A's "船用玻璃钢水舱 (FRP water tank)" and all FRP tank parameters are wrong — discard.
- ✅ RESOLVED: Standard is GB/T (recommended), not "GB" mandatory — Draft A's "强制性" claim is incorrect.
- ✅ FALSE POSITIVE (domain flag): GB/T 1447/1449/2577 — valid only if unit incorporates FRP components; otherwise misapplied.
- ⚠️ UNRESOLVED: Verify GB/T 4795-2023 effluent/alarm clauses against official text.
PROCUREMENT VERDICT
- Confirm supplier holds CCS type approval for the bilge-water unit.
- Verify effluent ≤15 ppm per MEPC.107(49) test protocol.
- Confirm 15 ppm alarm function.
- Obtain MARPOL/Flag-State approval for destination vessel.
- Cross-check GB 3552-2018 discharge compliance.
- Do NOT accept FRP-tank certificates as evidence of bilge-unit compliance.
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 4795-2023 § effluent limit — verify 15 ppm
- GB/T 4795-2023 § alarm — verify 15 ppm alarm
- MEPC.107(49) §3–4 — test protocol & alarm
- GB 3552-2018 — discharge limits
FIELD INSPECTION CHECKLIST
- Verify CCS type-approval certificate matches model.
- Witness 15 ppm alarm activation.
- Confirm effluent sampling port & test record.
- Check unit nameplate vs. certificate.
CONFIDENCE RATING
🟡 MEDIUM — standard identity verified from official authority; effluent/alarm clause numbers flagged for official-text confirmation.
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