CNG Refill Cylinders

A CNG (compressed natural gas) refill cylinder is a high-pressure, seamless storage tank made of steel or composite materials, designed to safely store CNG for various applications like vehicle fuel, kitchen fuel for home and restaurants and can also be used in some gas welding applications.
These cylinders are robust, rigorously tested, and equipped with safety features like a burst disc to prevent over-pressurization.
They come in different four types and capacities

Cylender Type	Details
1	All-metal (steel) cylinder with no external wrapping
2	Metal cylinder with a partial composite wrapping
3	Metal liner with a full composite wrapping
4	Plastic liner with a full composite wrapping

Vehicle Refill Cylender

Design and construction Material: Typically made from seamless steel or composite materials, which are both lightweight and durable.
Pressure: Designed to withstand high pressures, often between 150 and 300 bar (or 200 bar for a typical refill).
Safety Features: Includes a safety burst disc that ruptures to release pressure in case of over-pressurization.
Lifespan: Engineered to last for up to 20 years, provided they are properly maintained and inspected. 
Refill and usage Refueling process: The vehicle is parked at a CNG station, and a fueling nozzle is connected to a special fitting on the vehicle's receptacle.
Standard refill pressure: The maximum refill pressure is typically around 200 bar.
Important safety note: CNG cylinders must only be refilled at authorized stations and should not be used for any other gas like LPG, oxygen, or acetylene.
Capacity and dimensions - Vehicle cylinders: Commonly used in cars and have a water capacity typically ranging from 45 to 65 liters, with 50 liters being a very common size.
Dimensions: A 50-liter capacity cylinder, for example, may have a length of about 835 mm and a diameter of 316 mm.
Weight: An empty 50-liter cylinder weighs approximately 48 kg.
Weight variations: Composite-wrapped cylinders (Types 2, 3, and 4) are lighter than Type 1 cylinders of the same capacity.

Domestic Kitchen Cylender

CNG refill cylinders for domestic use are robust, safety-tested containers for storing compressed natural gas, though their primary use is for vehicles, not homes. These cylinders are designed for high-pressure storage (around 3000-3600 psi) and have a lifespan of 15-20 years, after which they must be replaced as they cannot be safely requalified. For domestic gas, the standard is a large, stationary cylinder supplied by a utility company or a smaller portable cylinder, but the specific infrastructure for home use is distinct from vehicle tanks.
Main use: While CNG cylinders are commonly associated with vehicles, the infrastructure for domestic gas is different and involves a connection to a piped supply or larger stationary storage tanks, not small, refillable cylinders in the same way as a car.
Safety: CNG is a safe fuel due to its high auto-ignition temperature, low explosive limits, and lighter-than-air properties which allow it to disperse quickly in case of a leak. Cylinders themselves are built to high safety standards and are rigorously tested.
Service life: Domestic gas cylinders have a long service life of up to 20 years, but once that period is over, they must be replaced and cannot be requalified.

Important considerations
Installation: Professional installation is required for any CNG system to ensure it is safe and meets all regulations.
Testing and inspection: Regular testing and inspection are necessary to ensure the cylinder remains safe to use.
Regulations: Depending on local regulations, there may be specific requirements for the type of cylinder used and its installation for domestic use.

Key differences between domestic and vehicle cylinders
Size and portability: Vehicle cylinders are typically smaller and designed to fit in a car, while domestic gas is usually supplied through a piped network or a larger stationary tank.
Refill method: Vehicle cylinders are refilled at a gas station using a special nozzle. Domestic systems are either connected to the utility grid or refilled on a regular schedule by a service provider.
Safety: Both types of cylinders are built to high safety standards, but the methods of installation, testing, and maintenance are different due to the different applications and environments they are used in.

Models

We have four models for retail refill-supply of the CNG Gas

#	Details	Description
1	Refill for domestic.	These refills come with a Bio-CNG fuel capacity of 10 KGs. Charges are done on per KG basis.
2	Piped supply in closed/gated community.	There will be a central station where CNG cylenders are installed and to each kitchen they are supplied using pipe lines. Meatering is done though meters installed at each kitchen.
3	Refill for restaurants.	These refills come with a Bio-CNG fuel capacity of 25 KGs. Charges are done on per KG basis.
4	Site Refill for Industries.	There will be a central station where CNG cylenders are installed and different target units are connected using pipe lines. Charges are done on per KG basis.