Industry Overview
Compressed Natural Gas (CNG) is a compressed form of natural gas, composed mainly of methane (CH4), that occupies less than 1% of the volume it occupies at standard atmospheric pressure, enabling large quantities of gas to be stored in CNG cylinders. For automotive applications, CNG is generally compressed to high pressure to increase onboard storage capacity, with the final filling pressure of CNG in vehicle cylinders limited to 200 bar as stated in the report.
CNG has been used as a transport fuel for decades and is widely adopted in auto rickshaws, cars, buses, and other vehicles. CNG cylinders must be strong, lightweight, impact-resistant, and capable of withstanding temperature variations and repeated pressure cycles. Depending on their construction materials, cylinders are classified as metallic, metal-composite, and fully composite designs.
The report examines the four principal CNG cylinder types, including Type 1 all-metal, Type 2 hoop-wrapped composite, Type 3 fully wrapped composite with metal liners, and Type 4 fully wrapped composite with non-metallic liners. It covers their design and testing requirements, advantages and limitations, regulatory requirements, international technologies, market adoption, manufacturers, suppliers, and applications. It also discusses composite cylinder technology in India and worldwide, including its use in automotive applications and the development of lightweight Type 4 cylinders.
Cost Estimation
| Particulars | Value |
|---|---|
| Plant Capacity | 100 Nos/Day |
| Land & Building | Rented |
| Plant & Machinery | Rs. 86 Lac |
| Working Capital for 2 Months | Rs. 22 Lac |
| Total Capital Investment | Rs. 1.42 Cr |
| Rate of Return | 22% |
| Break Even Point | 75% |
Content Index
- INTRODUCTION
- TYPE OF CNG CYLINDERS
- CYLINDER TYPES INCLUDE:
- TABLE 1: TYPE OF CNG CYLINDERS
- 1. TYPE 1 CYLINDER – ALL METAL.
- 2. TYPE 2 CNG CYLINDERS - HOOP WRAPPED COMPOSITE.
- 3. TYPE 3 CNG CYLINDERS – FULLY WRAPPED COMPOSITE WITH METAL LINERS.
- 4. TYPE 4 CNG CYLINDERS - FULLY WRAPPED COMPOSITE WITH NON-METALLIC LINERS.
- B.I.S. SPECIFICATION
- PROCESS FLOW CHART
- TESTING PROCESS OF CNG CYLINDER
- TESTING OF CNG CYLINDERS
- TESTS FOR CNG CYLINDERS
- NO OF TEST SPECIMENS
- REQUIREMENTS:
- A) HIGH TEMPERATURE CREEP TEST
- B) ACCELERATED STRESS RUPTURE TEST
- C) IMPACT DAMAGE TEST (DROP TEST)
- REQUIREMENTS:
- D) PERMEATION TEST
- E) FLAW TOLERANCE TEST
- F) ACID ENVIRONMENT TEST
- DIFFERENT CHEMICALS CAN BE USED:
- G) AMBIENT TEMPERATURE PRESSURE CYCLE TEST
- REQUIREMENTS:
- H) BURST TEST
- I) BON-FIRE TEST
- REQUIREMENTS:
- J) INTERNAL/EXTERNAL CORROSION
- K) CHEMICAL AND UV RESISTANCE
- I) FATIGUE IN CYCLING
- M) OVERPRESSURE DURING FILLING OR DUE TO TEMPERATURE CHANGES
- N) IMPACT AND ABRASION
- HYDROSTATIC STRETCH TESTING OF COMPRESSED GAS CYLINDERS
- 1. WATER JACKET METHOD
- 2. NON-JACKET METHOD
- FACILITIES REQUIRED FOR CYLINDER TESTING STATIONS
- 1. MANAGEMENT:
- 2. EQUIPMENT:
- GLOBAL MARKET POSITION
- GLOBAL CNG GAS CYLINDER INDUSTRY -BACKGROUND AND CHARACTERISTICS
- CNG CYLINDER STANDARDS IN DIFFERENT COUNTRIES:
- CNG CYLINDER REGULATIONS IN DIFFERENT COUNTRIES
- GLOBAL CNG CYLINDER MARKET
- TABLE: CNG CYLINDER MARKET
- COMPANIES MANUFACTURING TYPE 4 CYLINDERS:
- PENETRATION OF TYPE-4 COMPOSITE CYLINDERS IN AUTO INDUSTRY
- FOLLOWING ARE LIST OF SOME BUS MANUFACTURERS WHO ARE USING TYPE-IV GAS CYLINDERS:
- TABLE: TYPE 4 CYLINDER MARKET POSITION ON CITY BUSES IN EUROPE
- TABLE: TYPE 4 CYLINDER MARKET POSITION ON CITY BUSES IN NORTH AMERICA
- FOLLOWING ARE SOME OF THE BRANDS THAT ARE USING TYPE-4 CYLINDERS:
- FIGURE: BRANDS USING TYPE 4 COMPOSITE CYLINDERS
- GLOBAL CNG GAS CYLINDER MARKET
- NATURAL GAS VEHICLES DATA FOR IANGV:
- TABLE: POPULATION OF NGV’S AND REFUELING STATIONS
- FIGURE: NATURAL GAS VEHICLE COUNT BY REGION (1991-2010)
- FIGURE: ACTUAL AND PROJECTED VOLUMES OF NGV’S
- FIGURE: AVERAGE ANNUAL GROWTH RATE OF NGV’S BY REGION
- FIGURE: NGV GROWTH PROJECTION TILL 2014
- FIGURE: ESTIMATED PRODUCTION OF COMPOSITE REINFORCED CNG CYLINDERS
- PLANT LAYOUT
- PRESENT MANUFACTURERS AND SUPPLIERS
- SUPPLIERS OF CNG CYLINDER TESTING PLANT
Appendix
- APPENDIX – A:
- 01. PLANT ECONOMICS
- 02. LAND & BUILDING
- 03. PLANT AND MACHINERY
- 04. OTHER FIXED ASSESTS
- 05. FIXED CAPITAL
- 06. RAW MATERIAL
- 07. SALARY AND WAGES
- 08. UTILITIES AND OVERHEADS
- 09. TOTAL WORKING CAPITAL
- 10. TOTAL CAPITAL INVESTMENT
- 11. COST OF PRODUCTION
- 12. TURN OVER/ANNUM
- 13. BREAK EVEN POINT
- 14. RESOURCES FOR FINANCE
- 15. INSTALMENT PAYABLE IN 5 YEARS
- 16. DEPRECIATION CHART FOR 5 YEARS
- 17. PROFIT ANALYSIS FOR 5 YEARS
- 18. PROJECTED BALANCE SHEET FOR (5 YEARS)
Frequently Asked Questions
CNG cylinders are high-pressure storage vessels designed to safely contain compressed natural gas for automotive and other applications. They must withstand repeated pressure cycles, impact, temperature variations, and environmental exposure. The report describes metallic, metal-composite, and fully composite cylinder constructions and examines the four principal cylinder types. Cylinder selection depends on factors such as vehicle application, required storage capacity, weight, applicable standards, and safety requirements.
The four main CNG cylinder types are Type 1, Type 2, Type 3, and Type 4. Type 1 cylinders are all-metal, Type 2 cylinders use hoop-wrapped composite reinforcement, Type 3 cylinders are fully wrapped composites with metal liners, and Type 4 cylinders are fully wrapped composites with non-metallic liners. These designs differ in construction, weight, liner material, reinforcement, manufacturing requirements, and performance characteristics.
Composite materials are used in CNG cylinders primarily to reduce storage-system weight while maintaining the required mechanical performance. Conventional metal cylinders can add significant weight to a vehicle, whereas composite reinforcement can provide a favorable strength-to-weight ratio. Lower cylinder weight can support vehicle lightweighting and may contribute to improved fuel efficiency. The report therefore examines composite cylinder technologies, particularly their design, testing, safety characteristics, applications, and adoption in automotive markets.
CNG cylinders undergo a range of tests intended to evaluate strength, durability, environmental resistance, and safety. The report covers high-temperature creep, accelerated stress rupture, impact damage, permeation, flaw tolerance, acid environment, pressure cycling, burst, bon-fire, corrosion, chemical and UV resistance, fatigue cycling, overpressure, impact, and abrasion testing. Hydrostatic stretch testing is also discussed, including water jacket and non-jacket methods. The exact testing program depends on the applicable cylinder design and regulatory requirements.
A Type 4 CNG cylinder is a fully wrapped composite cylinder that uses a non-metallic liner with polymer composite reinforcement. Its construction is intended to achieve significant weight reduction compared with conventional metallic designs while providing the required pressure-storage capability. The report examines Type 4 cylinders in detail, including their design and testing requirements, international use, market penetration, manufacturers, and applications in vehicles. Particular attention is given to their potential for reducing the weight of automotive CNG storage systems.
CNG cylinder testing facilities require appropriate management arrangements, specialized equipment, controlled testing areas, and procedures aligned with applicable standards. The report specifically identifies management and equipment as key facility requirements and discusses hydrostatic testing and several mechanical, environmental, and pressure-related tests. A testing station must also incorporate suitable safety controls because cylinders are evaluated under high-pressure and potentially severe test conditions.
A CNG cylinder project report can cover technology, cylinder types, specifications, manufacturing and testing processes, standards, market conditions, plant layout, manufacturers, suppliers, and project economics. This report additionally examines composite cylinder technology and the global position of Type 4 cylinders. Its appendix includes plant economics, land and building, machinery, fixed capital, raw materials, salary and wages, utilities and overheads, working capital, capital investment, production costs, turnover, break-even point, financing resources, depreciation, profit analysis, and projected balance sheets.
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