Based on the search results, the choice between EAC Certificate (CoC) and EAC Declaration (DoC) under TR CU 032/2013 (also known as TR TS 032/2013) depends on risk classification, product parameters, and applicant eligibility. Here's a structured comparison:
⚖️ 1. Core Selection Criteria
Factor    EAC Certificate (CoC)    EAC Declaration (DoC)
Risk Category    Mandatory for Class 3-4 high-risk equipment:
- Pressure vessels >0.001 m³ & >0.05 MPa 
- Gas pipelines >DN 25 mm 
- Boilers (>110°C or >0.05 MPa steam)     For Class 1-2 lower-risk equipment:
- Liquid pipelines ≤DN 25 mm 
- Valves for non-hazardous media (DN ≤32 mm) 
Applicant Requirements    Open to foreign manufacturers; issued by EAEU-accredited bodies     Only EAEU-registered entities (local importer/distributor) 
Validity Period    Up to 5 years (with annual audits for batch production)     Up to 5 years (no audits, tied to batches/contracts) 
⚙️ 2. Product-Specific Requirements
Requiring EAC Certificate (CoC):
Pressure vessels: Volume >0.001 m³ & working pressure >0.05 MPa .
Gas pipelines/valves: Nominal diameter >25 mm for hazardous media (flammable/toxic) .
Boilers: Steam pressure >0.05 MPa or water temperature >110°C .
Safety devices: Valves >DN 32 mm for non-hazardous liquids .
Requiring EAC Declaration (DoC):
Low-pressure liquid pipelines: DN ≤25 mm .
Non-critical valves: DN ≤32 mm for non-hazardous gases .
Exclusions: Medical devices, nuclear equipment, aerosol dispensers .
📋 3. Certification Procedures
For EAC Certificate (CoC):
Steps:
1.Submit technical documents (safety justification in Russian, design drawings) .
2.Laboratory testing (e.g., 1.5x hydraulic pressure test, NDT) .
3.Mandatory factory audit (e.g., Scheme 1C/7C) for welding/QMS compliance .
4.Annual surveillance audits .
For EAC Declaration (DoC):
Steps:
1.Compile technical file (self-prepared test reports, technical passport) .
2.No factory audit (except Scheme 6D with ISO 9001) .
3.Register in EAEU database via accredited body .
⚠️ 4. Critical Compliance Requirements
Design & Manufacturing:
Safety justification in Russian, GOST-compliant strength calculations .
Welding must follow GOST R ISO 3834 with 100% NDT .
Documentation:
Technical passport & manuals in Russian/EAEU languages .
Material certificates (e.g., GOST standards) .
EAC Marking:
Mandatory on products (min. 5 mm height) .
⏱️ 5. Timeline & Cost Comparison
Aspect    EAC Certificate (CoC)    EAC Declaration (DoC)
Processing Time    2–5 months (due to audits/tests)     1–3 weeks (document review) 
Cost Drivers    Lab tests, factory audits, annual inspections     Minimal fees (self-declaration) 
💎 Summary & Recommendations
Opt for EAC Certificate (CoC) if:
Handling high-risk equipment (e.g., gas boilers, large pressure vessels).
Foreign manufacturers needing direct certification .
Choose EAC Declaration (DoC) if:
Products are lower-risk (e.g., small liquid pipelines, valves ≤DN 32 mm).
An EAEU-based legal entity can act as applicant .
All certified products must bear the EAC mark and comply with GOST standards .
⚠️ Note: Product classification depends on fluid group (Group 1: hazardous; Group 2: non-hazardous), diameter, and pressure . Consult an accredited body (e.g., 上海经合工业 ) for precise assessment.

Citations:
: Valve certification thresholds (DN 25 mm)
: Pipe classification table for DoC/CoC
: CoC requirements for foreign manufacturers
: DoC self-declaration process
: Design/manufacturing standards (GOST)
: Scope of regulated equipment
: Fitting/valve certification rules
: Risk classes & validity periods
: Audit and documentation requirements