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# Thread: actual capacity of 55l cng gas cylinder?

1. ## actual capacity of 55l cng gas cylinder?

hey people ,
i know it varies pump to pump and pressure to pressure but i would like to know how much actually a 55l cylinder in 210 to 220 pressure inhail cng gas in kg my experience is very strange some time it takes 8.2 , sometimes 8.3 and some times it takes more than 8.5 kg gas i know the theory of how it compress the gas if pressure is good and all that lot just like to know people experiences who actually read meter reading when there cylinder refil also i heard its better to empty your whole tank and then refil it does that has any effects i mean is it better that way or we keep refilling when gas gets a bit low please state your observation and experience thanks in advance.

2. ## i agree

i have 55 l cylinder and 8.5 kilo is last fill

Originally Posted by shqamar
thanks for replying ishtiaq so when i get 8.2 or 8.3 or less than 8.8 does that means pressure was good so it covers the cylinder quickly or that means pressure was bad so the cylinder only able to fill 8.2 and it shows that its full please eleborate .

3. 55 is the volume of the cylinder and not weight. So its 55 liters and not kg.

55 liters means 55 liters of water can be filled into it.

weight of 1 liter of water = 1 kg

weight of 55 liter of water = 55 kg

weight of 1 liter of cng = 0.18 kg (approximately)

weight of 55 liter of cng = 55 x 0.18 kg = 9.9 kg (max pressure 200 bar)

Please note that these cylinders are not manufactured for pressures above 200 bar, so it is not safe to go for a full tank if the gauge at the cng station reads above 200 bar.

1 liter cng = 0.18 kg at very low temperatures. Normally at cng stations and especially at ones where there is alot of rush, the gas does not get much time to cool down so the weight per liter decreases to like e.g.

1 liter = 0.15 kg

So its normal if a 55 kg of cylinder fills up with 8 kg.

Some times your cylinder fills up with oil due to which the volume can decrease may be from 55 liters to 50 liters. Oil comes from the cng pump where oil mixes with the gas during pressure build up. This oil is usually separated by high pressure oil filters before filling into the car but if the pump owner does not change these oil filters on time then oil will pass into your car cylinder and reduce its volume.

Best Wishes,
Hamid Bilal Younis
hamidbelal@yahoo.com

4. thanks hamid bilal for the detailed explanation !!

5. My Pleasure !

6. @fasfas 220 pressure is not legal and it's lethal, anything above 200 Bar of pressure is dangerous, because your cylinder can burst and it's not less than a bomb. Allah sab ko mehfooz rakhay. Ameen.

7. Dear,

If pressure is full then we can fill 9.2 kg gas in 55kg cylinder and milage is around 220-235 on Suzuki Mehran.

8. ## cng km/kg calculation

i have filled the 60 kg cylinder of toyota corolla 1300 cc .drive 82 km, refilled the gas which came 5 kg Avg came 16.26 km/kg.
again travelled 83 km and refilled the tank and gas came 3.25 kg now avg came 25,5 km/kg gas.
after two days filled the tank and gas came 1.83 kg as the tank was already full but the pressure was 160 bar and car guage was showing 9 points and not 10,
travelled 128 km and refilled the tank but this time with 200 presdire and not 160 bar, can we calculaye actual gas consumption?

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