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When calculating biogas pipelines, the pipe diameter should be determined based on the daily gas production volume. To reduce the pressure loss in biogas pipelines, it is also necessary to use the peak gas production rate for calculations; this peak rate is approximately 1.5 to 3.0 times the average gas production rate. Biogas pipelines are generally made of stainless steel pipes, anti-corrosion galvanized steel pipes, or anti-corrosion carbon steel pipes. As biogas flows through the pipes and the temperature gradually drops, condensation water continuously forms. To drain condensate, the gas pipeline should be laid with a slope of 0.5%, and water traps and drainage outlets should be installed at regular intervals or at the lowest points. Water seal tanks should generally be installed at appropriate locations along the biogas pipelines to regulate and stabilize pressure, as well as to act as a barrier between structures such as digesters, gas storage tanks, compressors, and boiler rooms. The water seal tank can also be used to drain condensate water. The cross-sectional area of the water seal tank is generally 4 times that of the air inlet pipe, while the height of the water seal is 1.5 times the gas pressure. To prevent the water seal from freezing, measures such as heating, filling it with an antifreeze solution, or providing continuous water supply can be taken, or it can be placed indoors. The H2S content in biogas is high, so corrosion prevention measures should be taken for the gas transmission pipes.