Hubei HDPE gas pipe | SDR11 medium pressure gas pipe, special pipe for coal to gas project

#Adaptation requirements for gas pipes in Hubei coal-to-gas project

Hubei hilly and mountainous areas account for nearly 80% of the total, with large fluctuations in rural terrain and temperature differences of up to 40 ° C in winter and summer. The pipeline laying scene of the coal-to-gas project is complex, and medium-pressure gas transmission pipes need to meet the requirements of strong weather resistance, anti-settlement, and convenient construction. Traditional steel pipes are prone to corrosion and high maintenance costs, making it difficult to adapt to such scenarios.

#Performance advantages of SDR11 HDPE medium pressure gas pipe

SDR11 refers to the ratio of the nominal outer diameter of the pipe to the nominal wall thickness of 11. The pressure-bearing capacity of the HDPE gas pipe meets the 0.4MPa medium-pressure gas transmission standard. It does not require additional anti-corrosion treatment for acid and alkali corrosion resistance. It has excellent flexibility and can be bent slightly to adapt to terrain fluctuations. Its anti-settlement performance is outstanding. Under normal working conditions, the service life can reach 50 years. The comprehensive operation and maintenance cost is only about 30% of the traditional steel pipe, which is fully suitable for the medium-pressure gas transmission demand of the Hubei coal-to-gas project.

#Selection points of HDPE gas pipe for coal-to-gas conversion

When selecting a model, it is first necessary to confirm that the pipe meets the GB 15558.1 national standard, which is clearly marked as the special grade for SDR11 medium pressure gas. In Hubei, it is preferred to use pipes produced with raw materials that add weathering aids to avoid brittle cracking during low-temperature construction or operation in winter. At the same time, match the appropriate pipe specifications according to the actual gas transmission pressure, and do not downgrade them at will.

#HDPE gas pipe construction core precautions

During construction, hot melt butt should strictly control the heating temperature, butt pressure and cooling down to avoid leakage caused by virtual welding; trench excavation should reserve settlement allowance according to the terrain, and protective casing should be installed when crossing roads and ditches; after construction is completed, airtightness test must be done according to specifications, and then layered backfill after confirming that there is no leakage. When backfilling, sharp stones should be avoided from scratching the outer wall of the pipe.