pert2型管在生活熱水輸送用管(guan)(guan)(guan)材這(zhe)方面的(de)(de)衛生性能應符(fu)合(he)GB/T17219的(de)(de)規定。外(wai)(wai)觀：pert2型(xing)(xing)(xing)(xing)管(guan)(guan)(guan)外(wai)(wai)觀應清潔，可視面不應有(you)影響其性能的(de)(de)構槽、裂(lie)紋、凹(ao)陷(xian)、雜質、顏色不均等(deng)缺陷(xian)。pert2型(xing)(xing)(xing)(xing)管(guan)(guan)(guan)管(guan)(guan)(guan)端(duan)(duan)的(de)(de)外(wai)(wai)護管(guan)(guan)(guan)宜與聚氨酯泡沫塑(su)料保(bao)(bao)溫層(ceng)齊平(ping)，且(qie)應與工作管(guan)(guan)(guan)的(de)(de)軸線(xian)垂(chui)直(zhi)，角度誤差(cha)應小平(ping)2.5°。pert2型(xing)(xing)(xing)(xing)管(guan)(guan)(guan)保(bao)(bao)溫層(ceng)受(shou)擠壓變(bian)形(xing)時，徑向變(bian)形(xing)量(liang)不應大(da)于(yu)設計保(bao)(bao)溫層(ceng)厚度的(de)(de)15%。外(wai)(wai)護管(guan)(guan)(guan)劃痕(hen)深度不應大(da)于(yu)外(wai)(wai)護管(guan)(guan)(guan)壁厚的(de)(de)10%，且(qie)應不大(da)于(yu)1mm。pert2型(xing)(xing)(xing)(xing)管(guan)(guan)(guan)兩(liang)端(duan)(duan)留出(chu)的(de)(de)無(wu)保(bao)(bao)溫預留段長度應滿足pert2型(xing)(xing)(xing)(xing)管(guan)(guan)(guan)連接的(de)(de)要(yao)求(qiu)，兩(liang)端(duan)(duan)預留長度之(zhi)差(cha)應不大(da)于(yu)20mm。