Why is a reducer needed before the quick connector on the nitrogen pipe at the utility station?
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The piping design specifications for utility stations state that the pipe diameter in such stations is generally DN25. For nitrogen pipes, a reducing coupling of DN25XDN20 is used before the quick connector; the quick connectors for hoses are DN20, unless special requirements apply. Why is a reducing fitting needed for nitrogen? Nothing else is needed?
Not very clear; I’ve never encountered it
Are the piping design regulations for utility stations set by each company itself? The regulations I’ve seen specify either DN25 or DN20; there is no separate specification for DN20 for nitrogen. Personally, I don’t think it has much of an impact; those who established the rule probably had some special considerations or experience behind it.
To prevent the wrong gas source from being connected, the diameter of the nitrogen inlet pipe is usually reduced, and a dedicated gas supply pipe is used, which differs in diameter from other gas source pipes
Thank you for your advice. Then, what does a dedicated gas supply pipe refer to?
The main difference lies in nitrogen pipes compared to other types of pipes; this is to prevent incorrect connections of nitrogen pipes. Nitrogen pipelines cannot be used interchangeably with other types of pipes. In our utility systems, nitrogen pipes are larger than those of other types of pipelines
Pressure-resistant hose with quick connector