From Raw Material to Finished Product – A Fully Traceable Supply Chain
At Hebei Jingbo Petroleum Machinery Co., Ltd. , the quality of our Kelly Hose begins long before manufacturing. We operate a vertically integrated supplying system that controls every stage – from raw material selection and in-house testing to final product inspection. This ensures full traceability, consistent performance, and API-certified reliability.
Raw Material Sourcing: Global Partners for Premium Quality
We select only the highest-grade raw materials from world-renowned brands and trusted domestic suppliers.
In-House Raw Material Property Testing
Our advanced laboratory is equipped to perform comprehensive property tests on every batch of incoming raw materials. This ensures that only materials meeting our strict specifications enter production.
Rubber Property Tests
1. Anti-Aging Property
- Test Method: Samples are placed in a specialized aging oven at +100°C for 24 hours
- Purpose: Simulates long-term service life and thermal degradation resistance
- Pass Criteria: Retention of tensile strength and elongation within specified limits
2. Plasticity
- Test Method: Measured using a Wallace rapid plastimeter
- Purpose: Determines the workability and processability of uncured rubber compounds
3. Adhesion Property (Rubber to Steel Wire)
- Test Method: Rubber and steel wire are vulcanized together under controlled heat and pressure
- Purpose: Measures bond strength between reinforcement and rubber layers – critical for preventing layer separation under pressure cycling
4. Strength and Breaking Elongation
- Test Method: Tensile testing using a universal testing machine (UTM)
- Purpose: Determines the ultimate tensile strength and elongation at break of cured rubber compounds
5. Hardness Property
- Test Method: Measured using a Shore A durometer
- Purpose: Ensures consistent flexibility and resistance to abrasion
Steel Wire Testing
- Tensile strength verification
- Bend and torsion tests
- Adhesion to rubber (as described above)
- Diameter tolerance check
Company Profile: Hebei Jingbo Petroleum Machinery Co., Ltd.
Industry Leadership and Certifications
Jingbo is recognized as a first-grade supplier to China’s three largest national oil companies:
- CNPC (China National Petroleum Corporation)
- SINOPEC (China Petrochemical Corporation)
- CNOOC (China National Offshore Oil Corporation)
As China’s first API-authorized manufacturer of oilfield hoses, we hold the following certifications:
- API Spec 7K: 7K-0376
- API Spec 16C: 16C-0374
- API Spec 16D: 16D-0140
- API ISO: 9001 9001-2008 (ISO 9001:2015 equivalent)
Commitment to Technology and Quality
- Advanced Laboratory: Equipped with modern testing instruments for raw material validation and finished product evaluation
- Continuous Improvement: Ongoing research and development of new rubber formulas to improve production efficiency and product performance
- Strong Quality Control Team: Every batch of incoming material is tested before release to production
- 100% Final Inspection: Every finished Kelly Hose undergoes full inspection prior to delivery, including pressure testing, dimensional verification, and visual examination
