Issue of selling at high points

Here, the air tank vent pipes are all led to a height of 1 above the ground. At around 8 meters, a valve is installed for control.

It is necessary to install it for pipes with a high point vent size of DN80 or larger; it is not required for pipes with a size of DN80 or smaller.

Our pipes are size 40, and venting is required in the process; I was wondering if there are any height requirements, as I’m not sure

Provisions: The high and low points of the pipeline shall be equipped with exhaust and drain ports respectively, which should be located in easily accessible areas. If there are other interfaces at the same height that can be used, it may not be necessary to provide separate exhaust or drain ports. Except for pipelines in pipe racks, exhaust ports can be omitted for pipelines with a nominal diameter of 25 mm or less; drain ports need not be provided at the low points that occur where steam tracing pipes make bends. The nominal diameter of the exhaust port at the high point should be at least 15 mm; the nominal diameter of the drain port at the low point should be at least equal to the nominal diameter of the main pipe – when the latter is 20 mm, a drain port with the same diameter can be used. The exhaust port at the high point of gas pipelines may not be fitted with a valve; it should be sealed using a flange cover or pipe cap. The distance from the lowest point of all drain ports to the ground or platform should not be less than 15 mm. Saturation steam pipelines at their low points shall be equipped with liquid collection tanks and steam trap assemblies. Location of vent ports: The distance between the vent ports for Class B gases and the discharge outlets of safety valves and the platform or building shall comply with the provisions of Article 4.4.9 of the current ** standards. In addition to the requirements mentioned above, the location of vent ports must also conform to the provisions of the current ** standards.

I think as long as it’s not a toxic medium, venting is fine as long as it doesn’t affect operations and safety； If it is a toxic medium, it must be fed into a closed system for recovery.

The general venting medium is chosen with the operator’s safety as a primary consideration； For those toxic substances, there are specific environmental requirements regarding the allowable emission height (limits on what can be released into the atmosphere).

First, consider the issue of the medium involved. If it is not a toxic medium, a higher level isn’t necessary; but if it is toxic, the height should be more than 3 meters above the operating surface

There are relevant regulations. Different media have different relevant regulations. The main considerations are whether it is toxic, flammable, or explosive, as well as its impact on the surrounding area. What is the size of the clearance area? For example, there are regulations stating that high-voltage lines, trees, residential houses, etc. are not allowed within this area.

Media that are toxic, flammable, explosive, or have irritating odors require different requirements regarding discharge height and location compared to ordinary media

We emit nitrogen, so there shouldn’t be that many restrictions, right?

Nitrogen is an inert gas that can be released into the atmosphere; the vent outlet only needs to be at least 2 meters above the adjacent operating platform

Refer to the \"Design Code for Industrial Metal Piping\"; relevant provisions are available there~~

It doesn’t matter what medium it is; there are clear regulations in the petrochemical industry regarding flammable or toxic media.

The high-point vent is installed at the highest point and is used for exhaust; there are no specific regulations regarding it.

What are the height requirements for flammable gas exhaust stacks and vent pipes? (1) The top of the flue for continuously emitted combustible gases or the vent opening shall be at least 3.5 m above the roof of a platform or building within a 20-m radius. 　　(2) The top of the flue for intermittently emitted combustible gases, or the vent opening, shall be at least 3.5 m above the roof of a platform or building within a 10-m radius.

This post was last edited by liuhg*a on 2014-10-29 at 14:01. Hello, may I ask which specific regulations set requirements regarding the emission height for hydrogen or organic gases? Could you please provide some standard and conventional names for reference? I’m new to this industry; thank you for your guidance!

GB50160-2008 Code for Fire Protection Design of Petrochemical Enterprises

Okay, thank you so much{:1_90:}