This is the 13760th most frequent Russian word.
нефтепровода
Pipeline for transporting oil.
The word "нефтепровода" is used in the genitive case to indicate possession or association, as part of a general statement describing actions concerning pipelines.
Нефтепровода необходимо регулярно проверять на герметичность.
Oil pipelines need to be regularly inspected for leaks.
The word "нефтепроводах" appears in the plural prepositional case to specify the location or the subject regarding pipelines.
Инженеры отмечают снижение давления в нефтепроводах.
Engineers note a decrease in pressure in oil pipelines.
Here, "нефтепровода" in the genitive singular case is used to specify the type of construction being discussed, emphasizing the noun's role in describing the object.