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главный трубопровод; магистральный трубопровод; pl система трубопроводов - air main - branch main - collecting main - condensate main - condensate-collecting main - condensate-gathering main - crossover gas main - delivery main - distributing main - filling main - force main - foul-gas main - fuel-gas main - gas main - gas-collecting main - gas-field gathering main - gathering main - heating main - hydraulic main - manifold mains - oil-field gathering main - oil-gathering main - public supply mains - pump main - pumping main - radial collecting main - radial gathering main - ring collecting main - ring gathering main - ring main - steam main - suction main - supply main - tank return main