Can two different types of gas be transported through the same pipeline?
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I would like to ask everyone: the boiler installed here requires liquefied gas to start operating, and once the plant is up and running, fuel gas will be supplied from other plants. Can these two types of gas be delivered through the same pipeline? It’s not transported simultaneously; the liquefied gas valve is closed as soon as fuel gas is available, to ensure that the two types of gas do not mix. Additionally, when making the switch, should nitrogen be used to displace the residual liquefied gas in the pipeline? If these residual gases are not displaced, could there be a risk of explosion when fuel gas is introduced?
This belongs to pressure pipelines; if the medium is to be changed, design approval is required. If the pressure increases, a modification plan is also needed – it cannot be simply changed just by doing so. It is best to create a change description. The procedures are still quite complicated; it’s not that simple
You need to ask the designer; I’ll do the calculations for you. Examine the feasibility of using one pipeline for both types of gas, and whether additional safety equipment is needed
Pipes can be shared, but burners cannot.
The burners are definitely not shared; there are two sets.
Pipe explosions won’t happen; neither of these two fuel gases contains oxygen. Be careful to avoid boiler explosions – switching between these two fuel gases is quite dangerous{:3_57:}
Here, it’s about design, as the fuel gas is used only once for a few days per year at the start of operations. For pipeline design, higher medium parameters are adopted. The project manager wants to use 1 pipeline, but I’ve checked all the specifications and there are no detailed rules regarding this. But if it’s really designed that way, I’m a bit worried about the safety of on-site operations.
It should be possible to shut down the boiler during the switchover; there is purchased steam that can be used temporarily.
Hehe, the gas pipelines in early oil refining plants were all standard; liquefied gas was used during operation, but a gasification unit was required； During normal production, self-produced dry gas is used; as the pipeline grade increases, the combustion nozzles change.
Are the components of these two types of gas very different? I guess the fuel gas sent from the device you mentioned also consists of liquefied gas components.