某(mou)熱(re)(re)水(shui)管線墊(dian)(dian)(dian)(dian)片(pian)設(she)計時，選用的是非金屬墊(dian)(dian)(dian)(dian)片(pian)（ethylene-propylene-dienetripolymer，EPDM），EPDM中文名稱：乙烯-丙烯-環戊二烯三元共聚物（三元乙丙橡膠）），共計118片(pian)。后來，在施工階段，考慮到如(ru)果運行(xing)時熱(re)(re)水(shui)管道出(chu)現問題，需(xu)要停車(che)檢修，影響較大，決(jue)定更換墊(dian)(dian)(dian)(dian)片(pian)為石墨復合墊(dian)(dian)(dian)(dian)，更換后材料柔性石墨復合墊(dian)(dian)(dian)(dian)片(pian) HG／T 20627 304S．S／GRAP.PN2.0MPa RF 1.5 mm。
