Storage requirements for plastic-lined composite pipes?

Plastic-lined steel pipes (including plastic-lined pipes) should be stored indoors in a straight and flat position, away from heat sources. When stored outdoors, rain-proof protective measures should be taken, and they should not be stored for long periods in places with direct sunlight or severe cold. The ambient temperature during storage of plastic-lined steel pipes (including plastic-lined pipes) should be between -30℃ and 45℃. When stacking plastic-coated steel pipes with an outer plastic layer, two layers of supporting pads with a width of 100mm should be used at the bottom. The number of stacking layers should comply with the regulations.