GB17918-2025
Safety specification for dust explosion protection in bulk grain loading and unloading system in port
港口散粮装卸系统粉尘防爆安全规范
GB 17918-2025 is a current mandatory Chinese national standard for Safety specification for dust explosion protection in bulk grain loading and unloading system in port. It appears in the Machinery compliance cluster with a product safety focus and has an implementation date of Aug 1, 2025.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to the design, operation, maintenance, and safety management of dust explosion protection in port bulk grain loading and unloading systems. It covers equipment, facilities, and structures involved in bulk grain handling at ports, including silos, bulk cargo storehouses, corridors, loading/unloading machinery, conveying equipment, weighing systems, and dust removal systems. It is mandatory for all enterprises operating port bulk grain facilities in China. The standard replaces the previous version GB 17918-2008 and introduces new requirements for mechanized horizontal bins, pneumatic unloaders, and dust collector specifications.
Technical requirements
The standard establishes general safety requirements including dust explosion risk identification, safety management systems, personnel training, and the use of explosion-proof electrical equipment compliant with GB 3836.15. Enterprises must implement static electricity elimination measures and prohibit open flames, spark-generating footwear, and iron tools in dust hazard zones. The standard defines dust explosion hazard zone classifications (Zones 20, 21, and 22) based on the frequency and duration of explosive dust environments, requiring dynamic reassessment when process or layout conditions change. For buildings and structures, the standard specifies fire protection design per GB 55037, lightning protection per GB 50057, and requires silo walls to be smooth with explosion relief vents. Both ordinary horizontal bins and mechanized horizontal bins have specific requirements, including physical isolation of electrical components from material storage areas. For loading/unloading machinery and conveying equipment, the standard mandates anti-static belts, slip/misalignment protection devices, dust control at material transfer points, and explosion venting for equipment such as bucket elevators and enclosed drag conveyors. Bucket elevators must employ at least one explosion control measure (venting, suppression, inerting, or isolation) and cannot rely solely on isolation. Bearing temperature monitoring is required for critical equipment. For dust removal systems, the standard requires independent dust collection per process area, steel or flame-retardant ductwork (aluminum prohibited), negative-pressure bag-type dust collectors with anti-static flame-retardant filter bags, and differential pressure monitoring with alarms. Dust collectors must be located outdoors and must start before and delay shutdown after the operational system.
Testing methods
Compliance verification is conducted through a combination of document review, on-site inspection, and measurement. Verification methods include reviewing enterprise management documents, safety training records, design and acceptance documents, product manuals, and certificates. On-site inspections confirm proper zone classification, equipment installation, static electricity elimination devices, and housekeeping practices. Physical measurements verify dimensions such as silo manhole diameter (≥0.7m), lighting height clearance (≥0.5m above grain), and clearance of reclaimer moving parts (≥15mm from ground). Operational records are checked for hot work permits, maintenance logs, and dust cleaning compliance.
FAQs
What products and facilities are regulated under GB 17918-2025?
GB 17918-2025 applies to all port bulk grain loading and unloading systems, including silos, bulk cargo storehouses (both ordinary and mechanized), corridors, ship unloaders (pneumatic, screw, chain, belt types), bucket elevators, belt conveyors, weighing systems, and dust removal systems used in port grain handling operations.
What are the key changes from GB 17918-2008 to GB 17918-2025?
The 2025 revision adds new terms for bulk grain, ordinary horizontal bins, mechanized horizontal bins, and trestles. It introduces new dust explosion protection requirements for pneumatic unloaders, plow-type discharge belt conveyors, and bin cleaning machines. It also updates requirements for hot work, static electricity prevention, dust collector duct materials, and adds a dedicated verification methods chapter (Chapter 11).
How does GB 17918-2025 relate to international standards?
The standard references several Chinese national standards that align with international practices, including GB 3836.15 for electrical equipment in explosive atmospheres (corresponding to IEC 60079-14), GB 15577 for general dust explosion safety, and GB/T 15605 for dust explosion venting. The hazard zone classification (Zones 20, 21, 22) follows principles consistent with international zone-based classification systems.
The summary above provides a high-level overview of GB 17918-2025. To ensure complete compliance for your port bulk grain handling facilities in the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 17918-2025 today to access all detailed parameters, zone classification tables, equipment-specific requirements, and verification procedures.
Applicability hints
- Type
- Safety
- CCS
- C 67
- ICS
- 13.230
- Competent department
- Ministry of Emergency Management
- Technical committee
- National Technical Committee on Work Safety of Standardization Administration of China
Relationships
Replaces:GB 17918-2008