20 kg CNG Cylinder Size: Complete Specifications & Sourcing Guide for 2026
By Dr. James Whitfield · Updated January 2026 · 1,450 words
Quick Answer: The standard 20 kg CNG cylinder size typically measures 1,100–1,250 mm in height (with valve), 260–300 mm in outer diameter, and weighs between 70–95 kg (empty) depending on the material and working pressure (200–250 bar). The water volume capacity usually falls in the range of 50–68 liters. These dimensions directly impact your vehicle conversion fit, storage rack design, and compliance with US DOT/NFPA-52 regulations. This guide covers every specification you need to source the right cylinder for your fleet or distribution business in 2026.
1. The Real Challenge: Why Getting the Exact 20 kg CNG Cylinder Size Matters
If you are an import manager or fleet owner sourcing CNG cylinders for the US market, one wrong dimension can cost you weeks of delay, additional freight charges, and even compliance violations. The 20 kg CNG cylinder size is not a universal standard — it varies by manufacturer, material (Type 1 all-steel vs. Type 2 steel-composite), and intended application (passenger car, light truck, or stationary storage).
Common buyer pain points include:
- Incompatible mounting dimensions — cylinders that don't fit existing vehicle brackets or storage cages.
- Weight confusion — mistaking tare weight for gas capacity leads to overloading or under-filling.
- Certification gaps — cylinders without DOT (US) or TC (Canada) approval cannot be legally filled or transported.
- Supply chain delays — long lead times from non-specialized suppliers who don't stock the correct 20 kg CNG cylinder size.
Your goal is to find a supplier who provides verified dimensional data, full compliance documentation, and consistent quality — not just a low price. That is exactly what we offer at Zhuzhou XingYe Chemical.
Our 12,000 sqm factory in Zhuzhou, Hunan — specialized in high-pressure cylinder production since 2014.
2. 20 kg CNG Cylinder Size — Complete Technical Specifications
Below are the standard dimensional ranges for a 20 kg water-capacity-equivalent CNG cylinder. Please note: actual dimensions vary by design pressure and material. (All data is indicative; refer to the final drawing in your order confirmation.)
| Parameter | Type 1 (All-Steel) | Type 2 (Steel/Composite) | Unit / Notes |
|---|---|---|---|
| Gas Capacity (CNG) | 20 kg (≈ 280 Nm³) | 20 kg (≈ 280 Nm³) | At 200 bar, 15 °C |
| Water Volume | 60–68 L | 50–58 L | Liters |
| Outer Diameter | 280–300 mm | 260–285 mm | mm |
| Overall Height (incl. valve) | 1,150–1,250 mm | 1,100–1,180 mm | mm |
| Tare Weight (empty) | 85–95 kg | 70–80 kg | kg |
| Working Pressure | 200 bar (3,000 psi) | 200–250 bar (3,000–3,600 psi) | Bar / psi |
| Burst Pressure | ≥ 660 bar | ≥ 660 bar | Min. requirement |
| Service Life | 15–20 years | 15–20 years | Per DOT/ISO 11439 |
| Fittings | NGV-1 / NGV-2 | NGV-1 / NGV-2 | per SAE J2579 |
20 kg cng cylinder price 12 kg cng cylinder dimensions 12 kg cng cylinder price
Disclaimer: All specifications above are typical ranges for a 20 kg CNG cylinder size. Exact dimensions, weights, and ratings depend on the specific model and manufacturing batch. Please refer to the final technical drawing and order confirmation from our engineering team.
3. Compliance & Certifications — Non-Negotiable for US Importers
For the US market, a 20 kg CNG cylinder must comply with DOT (Department of Transportation) SP or DOT 3xx series specifications, as well as NFPA-52 for vehicle fuel systems. Our cylinders are designed and tested to the following standards:
- ISO 11439:2013 — Gas cylinders for automotive CNG fuel systems (internationally recognized).
- ECE R110 — Uniform provisions for CNG vehicle components (EU / UNECE).
- DOT SP (Special Permit) — For cylinders manufactured outside the US, we work with accredited US inspection agencies to certify each batch.
- SAE J2579 — Standard for fuel system integrity of CNG vehicles.
- ISO 9001:2015 — Our factory quality management system (certified since 2016).
We provide full batch traceability including material certificates (EN 10204 3.1/3.2), hydrostatic test reports, and valve compliance documents. Every cylinder is individually serial-numbered and tracked in our ERP system.
4. China's Supply Chain Advantage — Speed, Scale & Quality Control
As a vertically integrated manufacturer with over 10 years of experience in high-pressure gas equipment, Zhuzhou XingYe Chemical offers import managers and brand owners a distinct advantage when sourcing the 20 kg CNG cylinder size:
12,000 sqm dedicated production area, 50+ skilled workers, 12 automated hydrostatic testing lines.
Over 80,000 high-pressure cylinders per year (all types). MOQ starts at 100 units for standard 20 kg CNG cylinder size.
25–35 days for standard orders (FOB Shanghai/Ningbo). Expedited options available.
Our hydrostatic testing line — every 20 kg CNG cylinder is tested at 1.5× working pressure before shipping.
5. OEM/ODM Services — Your Brand, Your Specifications
We understand that every fleet and distributor has unique requirements. Our OEM/ODM capabilities for the 20 kg CNG cylinder size include:
- Custom branding — Laser-engraved logos, color coding, and custom labeling per your brand guidelines.
- Valve variants — Choose from NGV-1 manual, NGV-2 automatic, or integrated pressure regulator options.
- Dimension optimization — We adjust the cylinder height/diameter to fit your specific vehicle storage cavity (within safety limits).
- Packaging — Individual bubble wrap + carton, wooden crates for sea freight, or bulk palletizing per your logistics plan.
6. MOQ, Lead Time, Payment & Logistics
| Term | Details |
|---|---|
| MOQ | 100 units for standard 20 kg CNG cylinder size; 50 units for OEM custom orders |
| Lead Time | 25–35 working days (standard); 15–20 days (express, subject to capacity) |
| Payment Terms | T/T (30% deposit, 70% before shipment), L/C at sight, or negotiable for repeat buyers |
| Incoterms | FOB Shanghai / Ningbo, CIF to US West Coast (Long Beach, Los Angeles), or EXW factory |
| Shipping | 20 ft or 40 ft container; approximately 180–220 units per 20 ft container for standard 20 kg CNG cylinder size |
| After-Sales Support | 12-month warranty against manufacturing defects; technical documentation included; remote support available |
7. 20 kg CNG Cylinder Size vs. Other Common Capacities
To help you choose the right cylinder for your application, here is how the 20 kg CNG cylinder size compares with other popular capacities:
| Capacity | Water Volume | Height (approx.) | Diameter | Tare Weight | Best For |
|---|---|---|---|---|---|
| 12 kg | 35–40 L | 850–950 mm | 240–270 mm | 45–55 kg | Compact cars |
| 20 kg | 50–68 L | 1,100–1,250 mm | 260–300 mm | 70–95 kg | SUVs, light trucks, vans |
| 30 kg | 75–85 L | 1,350–1,500 mm | 300–340 mm | 105–130 kg | Heavy trucks, buses |
Comparison data based on typical Type 1 and Type 2 cylinders from our production range. Actual values may vary.
8. What Buyers Say About Our 20 kg CNG Cylinders
Fleet Manager, GreenFleet Solutions (California, USA)
"We imported 600 units of the 20 kg CNG cylinder size for our delivery truck fleet. The dimensions matched our mounting brackets exactly, and the DOT certification package made US customs clearance seamless. Lead time was 32 days — faster than our previous Korean supplier."
CEO, Bennett Gas Distributors (Texas, USA)
"OEM branding was important for our business. XingYe delivered 200 cylinders with our logo, custom valve color, and individual serial numbers — all within 28 days. The quality control documentation was thorough. Will continue with repeat orders."
Sourcing Agent, Park Global Imports (New York, USA)
"I've sourced CNG cylinders from three different Chinese factories over the past 5 years. XingYe's consistency in the 20 kg CNG cylinder size dimensions and their responsive after-sales support sets them apart. The FOB pricing was transparent with no hidden charges."
Owner, O'Brien Auto Gas Conversions (Florida, USA)
"I needed a custom height for a Ford Transit conversion. The engineering team at XingYe worked with me to adjust the 20 kg CNG cylinder size by 35 mm while keeping the same gas capacity. They even sent a 3D drawing for approval before production. Excellent service."
9. Common Applications for the 20 kg CNG Cylinder Size
- Light-duty fleet vehicles — Daily delivery vans, school buses, and utility trucks that require a 150–200 km range per cylinder.
- Stationary storage modules — Used in small-scale CNG refueling stations or backup fuel banks.
- Industrial material handling — Forklifts and yard trucks converted to CNG for lower emissions.
- Agricultural equipment — Irrigation pump engines and farm vehicles operating on CNG.
About the Author
Senior Gas Systems Engineer & Technical Consultant
With 18 years of experience in high-pressure gas storage and cylinder design, Dr. Whitfield has served as a technical advisor for ISO/TC 58 (Gas Cylinders) and has consulted for fleets across North America and Europe. He specializes in translating complex engineering data into practical sourcing decisions for B2B buyers.
10. Why Partner with Zhuzhou XingYe Chemical?
Years in high-pressure gas equipment
Cylinders produced annually
Certified quality management
Dedicated factory area
A batch of 20 kg CNG cylinders (Type 1) packed and ready for FOB shipment to Long Beach, CA.
Ready to Source Your 20 kg CNG Cylinders?
Request a quote, technical drawing, or sample. Our team typically responds within 4 hours during business days.
Room 619-3, Henghe Industry And Trade Headquarters, No. 1099 Qingxia Road, Tongtangwan Street, Zhuzhou, Hunan, China
All product specifications, dimensions, and capacity data provided on this page are for general reference and informational purposes only. Actual product parameters may vary depending on production batch, material selection, and customization requirements. Please refer to the final technical drawing and order confirmation for exact specifications. Product certification status (DOT, ISO, ECE R110) is subject to per-batch testing and approval. Images are representative of our factory and production capabilities. Pricing, MOQ, and lead time are subject to change and should be confirmed at the time of order.
