Shijiazhuang Enric’s automated CNG cylinder production line

Hydrostatic pressure testing for 300 bar CNG cylinders

🇺🇸 U.S. Transit Agency | 500+ Buses (2023-2025)

Challenge: Needed DOT-certified cylinders for a fleet of 500 CNG buses with 300 bar pressure and 20-year lifespan.

Solution: Supplied Type 2 cylinders with aluminum liner + carbon fiber wrap for lightweight durability.

Result:

• ✅ 15% fuel savings due to reduced weight.
• ✅ Zero failures in 2+ years of operation.
• ✅ DOT compliance passed on first inspection.

🇪🇺 European Logistics Firm | Cross-Border Fleet (2024)

Challenge: Required TPED/CE-certified cylinders for cross-border transport between Germany, France, and Italy.

Solution: Type 1 seamless steel cylinders with anti-corrosion coating for European climate resilience.

Result:

• ✅ 40% cost reduction vs. local suppliers.
• ✅ 6-week delivery (half the industry average).
• ✅ Full compliance with EU 2018/858 regulations.

🇮🇳 Indian OEM | 10,000+ Cylinders/Year (2022-Present)

Challenge: Needed a localized supply chain for high-volume production of 250 bar cylinders.

Solution: OEM partnership with custom branding and just-in-time delivery.

Result:

• ✅ 30% lower production costs via China’s manufacturing scale.
• ✅ Zero stockouts in 24 months.
• ✅ BIS/ISI certification secured for Indian market.

1. What is the maximum pressure rating for your CNG cylinders?

Our cylinders are rated for 200 bar, 250 bar, and 300 bar (4,350 psi), with a safety factor of 2.25x as per ISO 9809-1. They undergo hydraulic burst tests at 1.5x working pressure and 100% ultrasonic inspection for defects.

2. Are your cylinders certified for international markets?

Yes. We hold ASME (USA), DOT (USA), CE (EU), TPED (EU), PED (EU), CCC (China), and other regional certifications. Our products are pre-approved for 40+ countries, including the U.S., EU, India, and Southeast Asia.

3. Can you customize cylinder designs for specific applications?

Absolutely. We offer full OEM/ODM services, including:

• ✔ Custom pressure ratings (up to 300 bar)
• ✔ Branding and labeling (your logo, colors, and text)
• ✔ Material selection (34CrMo4, 30CrMnSi, or aluminum)
• ✔ Valve and fitting compatibility (NGV-1, NGV-2, etc.)
• ✔ Special coatings (e.g., marine-grade epoxy)

Lead time for custom orders: 10-12 weeks.

4. What is your minimum order quantity (MOQ)?

Our standard MOQ is 100 units for off-the-shelf models. For custom designs, the MOQ is 500 units. Bulk discounts apply for orders over 1,000 units.

5. How do you ensure quality control?

Our quality process includes:

• ✔ Raw material testing (spectrometer analysis for steel grade)
• ✔ Automated welding with 100% X-ray inspection
• ✔ Hydrostatic pressure testing at 1.5x working pressure
• ✔ Leak testing (helium mass spectrometer)
• ✔ Third-party certification (e.g., TÜV, Bureau Veritas)

6. What are your payment terms?

We offer flexible payment options:

• ✔ 30% deposit, 70% before shipment (for first-time buyers)
• ✔ L/C (Letter of Credit) for large orders
• ✔ TT (Telegraphic Transfer) for established clients
• ✔ PayPal/Western Union for samples and small orders

Note: All payments are 100% secure and backed by trade assurance via Alibaba or bank guarantees.

7. How do you handle logistics and shipping?

We provide door-to-door shipping via:

• ✔ Sea freight (40-45 days to U.S./EU, 20-30 days to Asia)
• ✔ Air freight (5-7 days for urgent orders)
• ✔ Land freight (for neighboring countries like Russia, Kazakhstan)

Packaging: Wooden crates + foam protection to prevent damage. Customs clearance is handled by our partners.

8. What after-sales support do you offer?

Our support includes:

• ✔ 24/7 technical support via email/WhatsApp
• ✔ Warranty: 2 years for manufacturing defects
• ✔ Training: On-site or virtual training for installation and maintenance
• ✔ Spare parts: Valves, fittings, and accessories available at cost
• ✔ Requalification: Guidance on 5-year hydrostatic retesting