# What % reduction in gas flow results from changing to LPG?

• pkc111
In summary, the flame temperature of both gases will be the same, but the volume rate consumption will differ due to the difference in calorific value.

#### pkc111

TL;DR Summary
My Rubens Tube is running on natural gas and I am having some problems that maybe related to high gas speed in the tube. I am hoping that changing to LPG may reduce this gas speed problem a lot.
There are 70 jets of 1/16" diameter along the tube and I neeed to create flames 1" high.
I know the calorific value of natural gas is much less than LPG (39 MJ/m3 Vs 93 MJ/m3) . I am not sure what assumptions to make from there in order to compare the predicted natural gas to the LPG volume rate consumption? Ie will a 1 inch flame of both gases consume the same m3/h or does it work that both 1 inch flames of each gas type produce the same MJ/h? I have read that the flame temperature of both gases is around 3550F if that helps?
Thanks

The flame temperature of both gases will be the same, but the volume rate consumption will be different. Natural gas has a lower calorific value than LPG, so it will generally require more m3/h to produce the same amount of heat. You can calculate the volume rate consumption of each gas by dividing the calorific value (in MJ/m3) by the flame temperature (in Kelvin). For example, for natural gas, you would divide 39 MJ/m3 by 5810 Kelvin, which would give you 0.0067 m3/h. For LPG you would divide 93 MJ/m3 by 5810 Kelvin, which would give you 0.0159 m3/h. So in this case, the LPG flame would require more than double the volume rate consumption of natural gas to produce the same amount of heat.

## 1. What is the difference in gas flow between LPG and other fuels?

The difference in gas flow between LPG and other fuels varies depending on the specific fuel being compared. However, on average, LPG tends to have a lower gas flow rate compared to other fuels.

## 2. Does switching to LPG result in a significant reduction in gas flow?

Yes, switching to LPG can result in a significant reduction in gas flow. This is because LPG has a lower density compared to other fuels, resulting in a lower gas flow rate.

## 3. How much of a reduction in gas flow can I expect when switching to LPG?

The percentage reduction in gas flow when switching to LPG can vary depending on the specific application and factors such as burner design and fuel pressure. However, on average, it can range from 10-40%.

## 4. Why does LPG have a lower gas flow compared to other fuels?

LPG has a lower gas flow rate due to its lower density compared to other fuels. This means that less gas is released when the same amount of fuel is burned, resulting in a lower gas flow rate.

## 5. Are there any benefits to the reduced gas flow when using LPG?

Yes, there are benefits to the reduced gas flow when using LPG. It can result in cost savings as less fuel is consumed for the same amount of gas flow, and it can also lead to a more efficient and cleaner burning process.