What are the general functions of the four types of media installed in utility stations?
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I have been working on utility systems recently, and utility stations are usually installed near the manholes in towers. I would like to ask everyone: what are the typical functions of the four types of media used in utility stations – domestic water, factory air, low-pressure steam, and nitrogen? Thank you!
Potable water: for flushing floors, eye wash stations, etc. Instrument air: for purging, displacement, etc. Low-pressure steam: for purging, heat tracing, etc. Nitrogen: for displacement
Is potable water provided at the hose station on the tower? ? ? There will be fresh water in the framework area.
Instrument air is used for instruments, while process air is used for purging and similar purposes
Not all four types are necessary at each utility station; the choice should be based on actual needs.
How is gas used for instruments applied to industrial purging? ? !
The ground station seems to also need a pipe for returning condensed water
They are all used for purging, displacement, and cleaning. Public utilities are meant to be for public use. However, the water should be fresh water, and the air should be industrial air.
Thank you all for your advice! The wording for the water used in daily life was incorrect; it should indeed be fresh water. Additionally, in some towers, due to their great height, it’s not possible to install the pressure regulator for fresh water at a high position
What size are the water pipes, and the water also serves to clean the equipment! If maintenance is required during parking, it must first be washed with water, then with steam, and finally purged with nitrogen! At the same time, steam serves two purposes: one is for heat tracing, and the other is for cleaning the equipment! Factory air is a matter of safety; in case of a leak, use wet air!
Generally, hose stations are equipped with process water supply valves; there is waste of domestic water as well
On the pipe tray, a DN20 common hose station should generally be installed every three pipe supports, near the columns. It consists of hose fittings for industrial water, nitrogen, compressed air, steam, etc. For the service points on the frame and tower platforms, compressed air and steam are generally sufficient. If there are liquefied hydrocarbons inside the equipment, nitrogen must be added. Note that on steam branches used for important purposes such as power generation, heating, and manufacturing processes, no additional steam branches for other purposes such as fire suppression or purging shall be connected. Fire extinguishing/fire fighting steam should be taken from the main steam main and must not be used for purging.
Instrument air is not meant for purging; it is used to power pneumatic valves
Production water used at hose stations generally has specific water quality requirements. It is divided into softened water, deoxygenated water, deionized water, or steam condensate, etc. When high water quality requirements are not necessary, it can also be directly connected to the fresh water system. Water at the hose station is generally used for flushing equipment and pipes, and it is usually connected to the fresh water supply pipeline. It should be noted that there is a difference between production water and domestic water. Potable water is used for drinking, showering, and eye washing. Compressed air, also known as unpurified air, is used for purging, backwashing, etc. It is also used to connect a pneumatic wrench during frame maintenance. Nitrogen, used for replacing materials or air. But be sure to pay attention to safety when using it, and make sure to dilute the nitrogen after use. Steam uses 1.0 MPa low-pressure steam for purging.
Please refer to the standard HG-T 20570.13-95.
The conditions provided by the poster are not sufficient enough; which section of the tower is the manhole located in? Generally speaking, the functions of these four types of utility media are as follows: Potable water: This type of water is usually tap water or groundwater with high hardness, and it is used for cleaning floors. Or, in emergency situations, use it to rinse the surface of mild burns. Factory air: compressed air, used to replace the gas inside the tower during maintenance to ensure personnel safety. It can also be used as the power air for control valves or on/off valves. Low-pressure steam: Steam used for tracing pipes in tower-related pipelines, as well as for fire suppression. Nitrogen: Used for displacing the gas inside the tower, and can serve as a protective gas for the materials within the tower.