Wuhu Hengxin Cable Co., Ltd
Contact:Mr Dai
Phone: 13955309088
Address: 13955309088@163.com
Address: Jiuhua North Road Electrical Components Industrial Park, Wuhu City, Anhui Province
Pipeline heat tracing, insulation and anti-corrosion
管道的防腐防腐是为了延长管道的寿命。管道敷设方式不同,防腐要求也不尽相同。对于不需保温的地上管道,管道外壁除锈后涂两道红丹漆,再刷两三道醇酸磁漆即可。如需保温,加一层玻璃布或镀锌铁皮后,外面再刷两遍醇酸磁漆。管沟管道极易腐蚀,经除锈、红丹漆打底后,可刷环氧树脂漆。埋地管道应根据土壤的电阻率采用不同等级的防腐绝缘或阴极保护,也可采用牺牲阳极的电化学保护措施。埋地管道防腐过去常采用三油两布甚至四油三布(油指沥青,布指玻璃布),由于工艺复杂、成本高,逐渐被聚乙烯防腐胶带代替。除锈后一道底漆,再扎内带和外带即可。
为了便于识别与管理,各种管道应涂刷成不同的颜色。如,保温油罐为中灰色,机泵为银白色,铸钢阀门为橘黄色等。
管道的伴热对于粘度大、易凝结的油品(如润滑油、重油等)都需要加热输送。为了减少输送过程中的热损失,除进行管道保温外,有时还需逐段对管道予以伴热。蒸汽伴热管道铺设应注意:
(1)伴热蒸汽应从供汽主线上方引下,保持蒸汽压力稳定。
(2)将伴热管和输油管紧贴在一起捆牢,外加保温层。
(3)伴热管尾端应在低点通过疏水器以便排除冷凝水。
(4)伴热尽量不要和输油管道扫线蒸汽共用汽源,以免扫线不严或忘记关阀使油品窜入伴热管,冻凝管道;必须合用时,扫线阀与油管之间必须装单向阀。
(5)由于管内介质存在温差,伴热管应在适当距离设置补偿管。
管道的保温加热输送的油品管道需要保温,蒸汽管、水管也要保温。由里到外,管道保温层依次是防腐层、保温层、防潮层和保护层。防腐层是在管壁外涂刷一层沥青底漆或两遍红丹漆,以避免管道外壁的氧化腐蚀。保温层是用玻璃布、泡沫石棉或海泡石等导热性能低的材料,制成一定形状包于管子或设备外部,厚度视管径大小和介质温度而定。防潮层是用沥青玻璃布缠绕于保温层外面,防止雨雪浸入保温层。最外面是保护层,用0.5mm厚的镀锌铁皮或玻璃布缠绕、石棉水泥抹面。应防止人为损坏,延长保温层寿命。
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