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2em;\">丁腈橡胶适用于石油类产品，如石油、润滑油、燃料油等，长期使用温度为120℃，如在热油中可耐150℃，低温为-10~-20℃。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">氯丁橡胶适用于海水、弱酸、弱碱、盐溶液，耐氧和臭氧老化性能优异，耐油性次于丁腈橡胶而优于其他通用橡胶，长期使用温度低于90℃，最高使用温度不超过130℃，低温为-30~-50℃。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">氟橡胶有多个品种，它们分别具有良好的耐酸、耐氧化性能以及耐油、耐溶剂性能。可以在几乎所有的酸类介质以及一些油和溶剂中使用，长期使用温度低于200℃。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">橡胶板材作为法兰垫片，多用于管道或经常拆卸的人孔、手孔，压力不超过1.568MPa。因在各类垫片中，橡胶垫片最软，贴合性能好，在较小的预紧力下就能发挥密封效果。正因如此，在承受内压时，因垫片偏厚或硬度偏低而容易被挤出。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">橡胶板材在苯、酮、醚等有机溶剂中使用，易出现溶胀、增重、变软、发粘现象，导致密封失效。一般溶胀度超过30%就不能使用。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">在低压(尤其是0.6MPa以下)、真空情况下，采用橡胶垫较为适宜。橡胶材料致密性好，透气率低。例如氟橡胶，最适宜作真空容器的密封垫片，真空度最高可达1.3×10-7Pa。橡胶垫在10-1~10-7Pa真空度范围使用时，需经烘焙和抽气处理。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">2 、石棉橡胶板\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">价格较其它垫片低，使用方便;最大问题是：垫片材料虽然加入了橡胶和一些填充剂，仍无法将那些串通的微小孔隙完全填满，存在微量渗透。故在污染性极强的介质中，即使压力、温度不高也不能使用。当用于一些高温油类介质时，通常在使用后期，由于橡胶和填充剂碳化，强度降低，材质变疏松，便在界面和垫片内部产生渗透，出现结焦和发烟现象。另外，石棉橡胶板在高温下易粘结在法兰密封面上，给更换垫片带来了许多麻烦。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">在受热状态下，垫片在各种介质中的使用压力取决于垫片材料的强度保持率。石棉纤维材料中存在着结晶水和吸附水。110℃时，纤维之间的吸附水已有2\u002F3析出，纤维的抗拉强度约降低10%;368℃时，吸附水全部析出，纤维的抗拉强度约降低20%;超过500℃，结晶水开始析出，强度则更低。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">介质对石棉橡胶板的强度影响也很大。例如，在航空润滑油和航空燃油中，400号耐油石棉橡胶板横向抗拉强度相差80%，这是由于航空燃油对板材中橡胶的溶胀比航空润滑油严重之故。考虑到上述因素，国产石棉橡胶板XB450的推荐安全使用范围：温度250℃~300℃，压力3~3.5MPa;400号耐油石棉橡胶板使用温度不宜超过350℃。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">石棉橡胶板含有氯离子和硫化物，吸水后容易与金属法兰形成腐蚀原电池，尤其是耐油石棉橡胶板中硫磺含量高出普通石棉橡胶板好几倍，故在非油性介质中不宜使用。垫片在油品和溶剂类介质中会发生溶胀现象，但在一定范围内，对密封性能基本没有什么影响。例如，400号耐油石棉橡胶板在常温航空燃油中作24小时浸泡试验，要求因吸油重量增加不得超过15%。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">国产石棉橡胶板与国外名牌产品相比尚有一定差距。某单位的统计数字表明，在超过350℃的油介质中，凡使用石棉橡胶板不漏的大多为进口产品。日本石油工业标准JPI-7S-71《石油工业用石棉橡胶板使用标准》，使用期限约为一年。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">3 、聚四氟乙烯\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">聚四氟乙烯在受压及高温下易冷流及蠕变，故一般用于低压、中温、强腐蚀以及不允许污染的介质，如强酸、强碱、卤素、药品等。安全使用温度在150℃，压力 1MPa以下。填充聚四氟乙烯虽然强度高些，但使用温度也不超过200℃，且耐腐蚀能力下降。聚四氟乙烯包垫最高使用压力一般不超过2MPa。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">由于温度升高，材料发生蠕变，致使密封压力明显下降。即使不升温，随着时间的延长，密封面的压紧应力也会下降，产生“应力松弛现象。该现象在各种垫片中都会产生，只是聚四氟乙烯垫的应力松弛现象较为严重，应予注意。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">聚四氟乙烯的摩擦系数较小(压紧应力大于4MPa，摩擦系数为0.035~0.04)，预紧时垫片易向外滑移，所以最好采用凹凸式法兰面。当采用平面法兰时，可将垫片外径接触螺栓，利用螺栓阻止垫片外滑。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">由于搪玻璃设备是在金属表面喷涂了一层瓷釉后烧结而成的，釉层很脆，加之喷涂不均匀和釉层流动，法兰表面平面度较差。采用金属复合型垫片易损坏釉层，所以推荐使用芯材由石棉板加橡胶的聚四氟乙烯包垫。这种包垫既容易与法兰面贴合又耐腐蚀，使用效果良好。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">有许多厂在温度、压力不高的强腐蚀介质中，采用石棉橡胶板外缠聚四氟乙烯生料带，用于经常拆卸的人孔、管道上。由于制作、使用方便，颇受欢迎。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">4  、石棉树脂板和浸渍石棉板垫片\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">多用于各种酸性介质的管道、泵、阀、进出口法兰，其使用温度在80℃、压力在0.6MPa以下。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">石棉编制垫片适用于压力0.1MPa以下，温度不超过800℃的低压、高温工况。并可根据设备的具体要求，编织成不通宽度、厚度、直径的垫片。或将石棉带剪下后直接敷在法兰表面。它用于大型硫酸、硝酸氧化炉以及一些未经加工的设备接口处，效果远远超过原来的石棉绳。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">5 、金属包石棉垫\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">由金属薄板包覆石棉板或石棉橡胶板，使其不与介质直接接触，避免了石棉纤维强度下降，客服了渗漏现象，从而扩大了石棉橡胶板的使用范围。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">一般金属包石棉垫使用温度为450℃(个别也有达600~700℃，如在常压~0.16MPa的烟道气中)，使用压力为4MPa，最高可达6MPa。如压力再增高，垫片易产生横流现象，芯材从搭接处挤出。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">由于金属包石棉垫需要较大的螺栓拧紧力，即使当使用压力低于2.45MPa，也不能采用pg25公斤级以下的法兰。否则，法兰、螺栓的刚度就显得不够，产生变形而导致密封失效。有人认为，若将芯材改为弹性较好的合成橡胶，其紧固力就会下降。其实不然，因为芯材改软后，紧固力被芯材吸收，不能提供金属板在法兰面上贴合所需的紧固力，包垫反容易被极坏。另外，在含氯离子较多的介质以及酸性介质中，不锈钢包垫及铁皮包垫的搭接处易产生缝隙腐蚀。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">温度高于450℃，芯材可使用陶瓷纤维或碳纤维。某钢铁厂采用金属包陶瓷纤维垫片用于1100℃的高温，使用二年尚未损坏。柔性石墨作芯材是最合适的。目前，国内已批量生产金属包柔性石墨垫。其使用效果优于金属包石棉垫。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">金属包垫能制成各种形状，大量用于各种热交换器、反应器的大盖、装卸孔、人孔法兰等。国内曾制作过直径为2m的铁包垫，使用情况良好。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">在金属包垫的表面贴覆一层柔性石墨薄板，这种垫片与表面未包覆的同类金属包垫相比，预紧比压较小，密封性能更佳。图2-9为两者压紧应力与泄漏量的关系曲线。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">目前国内尚无此产品，故有的单位将现有的柔性石墨皱纹带贴在金属包垫以及金属平垫、齿形垫甚至石棉橡胶垫表面，解决了许多泄漏难题。例如某厂的热交换器，压力为5.88MPa、温度450℃，介质为氢\u002F油气。曾用过金属平垫、齿形垫，均有泄漏。后在平垫上贴了柔性石墨皱纹带，解决了这一问题。应该指出，这种垫片形式是一种解决法兰垫片泄漏的简便措施，贴覆柔性石墨带的工作性质量直接影响设备能否正常运转。若在带材背面涂刷一层胶水，可提高贴覆质量。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">6 、金属缠绕垫 \u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">金属缠绕垫巧妙地利用金属的耐热性、回弹性和强度以及非金属材料的柔软性，所以密封性能较好，其中又以不锈钢带缠绕柔性石墨垫的性能为最佳。其预紧比压较石棉缠绕垫小，不存在石棉纤维毛细孔渗漏的缺点。图2-10为两者预紧比压与泄漏量的关系曲线。在油介质中，金属带材多使用0Cr13，而其它介质则推荐使用1Cr18Ni9Ti。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">不锈钢带柔性石墨缠绕垫在气体介质中，使用压力为14.7MPa(国内有高达19.6MPa)，在液体中可用至30MPa。温度-190~+600℃(在无氧、低压情况下可用至1000℃)。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">聚四氟乙烯的耐低温性能良好，它在低温下的屈服强度大大高于常温时的强度。所以聚四氟乙烯缠绕垫可用于低温介质，如液态烃等。同时，因加入金属带提高了导热性，聚四氟乙烯缠绕垫使用温度可达250℃，在酸性介质中可用至9MPa、200℃。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">缠绕垫用于压力和温度波动较大的换热器、反应器、管道、阀门、泵进出口法兰较为合适。对于中等以上压力、温度超过300℃者，应考虑使用带内环、外环或内外环。若使用凹凸面法兰，配带内环的缠绕垫效果更好些。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">在柔性石墨缠绕垫两面贴覆柔性石墨板也能取得好的密封效果。某大型化肥厂废热锅炉属高温高压关键设备，用带外环的柔性石墨缠绕垫，满负荷时不漏，减负荷时则漏。在垫片两面增加了0.5mm厚的柔性石墨板，剪成圆弧状，接头部分采用斜口搭接，使用情况良好。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">7 、金属平垫和金属波形垫\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">一般用于中、高压阀门、管道和直径较小的设备法兰上。使用压力则根据温度的不同，前者为1.568~31.36MPa，后者为1.568~3.92MPa。垫片材质根据介质和温度选取。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">8 、八角垫和椭圆垫\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium; text-align: justify; text-indent: 2em;\">用于梯形槽面法兰的八角垫和椭圆垫(炼油行业俗称“土钢圈”)密封性能均好。在沟槽的锥面上，八角垫为面接触而椭圆垫是线接触。因此，椭圆垫在低紧固力下贴合性好，但需进行二次紧固;而八角垫一般一次紧固后，不易出现泄漏。它们的不足之处为要求较大的螺栓拧紧力，当用于低压高温情况时，法兰等级须在 pg25公斤级以上。\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n \u003Cp style=\"font-size: medium;\">\u003Cbr>\u003C\u002Fp>\n\u003C\u002Fdiv>","website-chuxin\u002Fimage\u002Fweb\u002Fcncxfl\u002Fupload\u002F840\u002F202307\u002F883a37f6f78741299cd91515630f298e.png","天然橡胶适用于水、海水、空气、惰性气体、碱类、盐类水溶液等介质，但不耐矿物油和非极性溶剂，长期使用温度不超过90℃，低温性能优异，可在-60℃以上使用。",3459,"2023-07-12 08:51:00",{"id":956,"title":957},9343,"法兰盖的生产材料",{"id":959,"title":960},10344,"阀门和法兰的压力等级",{"cn":962},{"content":963,"title":949,"summary":952},"\u003Cdiv class=\"__kindeditor_paste__\">\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t1 、工业橡胶\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t天然橡胶适用于水、海水、空气、惰性气体、碱类、盐类水溶液等介质，但不耐矿物油和非极性溶剂，长期使用温度不超过90℃，低温性能优异，可在-60℃以上使用。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t丁腈橡胶适用于石油类产品，如石油、润滑油、燃料油等，长期使用温度为120℃，如在热油中可耐150℃，低温为-10~-20℃。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t氯丁橡胶适用于海水、弱酸、弱碱、盐溶液，耐氧和臭氧老化性能优异，耐油性次于丁腈橡胶而优于其他通用橡胶，长期使用温度低于90℃，最高使用温度不超过130℃，低温为-30~-50℃。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t氟橡胶有多个品种，它们分别具有良好的耐酸、耐氧化性能以及耐油、耐溶剂性能。可以在几乎所有的酸类介质以及一些油和溶剂中使用，长期使用温度低于200℃。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t橡胶板材作为法兰垫片，多用于管道或经常拆卸的人孔、手孔，压力不超过1.568MPa。因在各类垫片中，橡胶垫片最软，贴合性能好，在较小的预紧力下就能发挥密封效果。正因如此，在承受内压时，因垫片偏厚或硬度偏低而容易被挤出。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t橡胶板材在苯、酮、醚等有机溶剂中使用，易出现溶胀、增重、变软、发粘现象，导致密封失效。一般溶胀度超过30%就不能使用。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t在低压(尤其是0.6MPa以下)、真空情况下，采用橡胶垫较为适宜。橡胶材料致密性好，透气率低。例如氟橡胶，最适宜作真空容器的密封垫片，真空度最高可达1.3×10-7Pa。橡胶垫在10-1~10-7Pa真空度范围使用时，需经烘焙和抽气处理。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t2 、石棉橡胶板\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t价格较其它垫片低，使用方便;最大问题是：垫片材料虽然加入了橡胶和一些填充剂，仍无法将那些串通的微小孔隙完全填满，存在微量渗透。故在污染性极强的介质中，即使压力、温度不高也不能使用。当用于一些高温油类介质时，通常在使用后期，由于橡胶和填充剂碳化，强度降低，材质变疏松，便在界面和垫片内部产生渗透，出现结焦和发烟现象。另外，石棉橡胶板在高温下易粘结在法兰密封面上，给更换垫片带来了许多麻烦。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t在受热状态下，垫片在各种介质中的使用压力取决于垫片材料的强度保持率。石棉纤维材料中存在着结晶水和吸附水。110℃时，纤维之间的吸附水已有2\u002F3析出，纤维的抗拉强度约降低10%;368℃时，吸附水全部析出，纤维的抗拉强度约降低20%;超过500℃，结晶水开始析出，强度则更低。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t介质对石棉橡胶板的强度影响也很大。例如，在航空润滑油和航空燃油中，400号耐油石棉橡胶板横向抗拉强度相差80%，这是由于航空燃油对板材中橡胶的溶胀比航空润滑油严重之故。考虑到上述因素，国产石棉橡胶板XB450的推荐安全使用范围：温度250℃~300℃，压力3~3.5MPa;400号耐油石棉橡胶板使用温度不宜超过350℃。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t石棉橡胶板含有氯离子和硫化物，吸水后容易与金属法兰形成腐蚀原电池，尤其是耐油石棉橡胶板中硫磺含量高出普通石棉橡胶板好几倍，故在非油性介质中不宜使用。垫片在油品和溶剂类介质中会发生溶胀现象，但在一定范围内，对密封性能基本没有什么影响。例如，400号耐油石棉橡胶板在常温航空燃油中作24小时浸泡试验，要求因吸油重量增加不得超过15%。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t国产石棉橡胶板与国外名牌产品相比尚有一定差距。某单位的统计数字表明，在超过350℃的油介质中，凡使用石棉橡胶板不漏的大多为进口产品。日本石油工业标准JPI-7S-71《石油工业用石棉橡胶板使用标准》，使用期限约为一年。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t3 、聚四氟乙烯\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t聚四氟乙烯在受压及高温下易冷流及蠕变，故一般用于低压、中温、强腐蚀以及不允许污染的介质，如强酸、强碱、卤素、药品等。安全使用温度在150℃，压力 1MPa以下。填充聚四氟乙烯虽然强度高些，但使用温度也不超过200℃，且耐腐蚀能力下降。聚四氟乙烯包垫最高使用压力一般不超过2MPa。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t由于温度升高，材料发生蠕变，致使密封压力明显下降。即使不升温，随着时间的延长，密封面的压紧应力也会下降，产生“应力松弛现象。该现象在各种垫片中都会产生，只是聚四氟乙烯垫的应力松弛现象较为严重，应予注意。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t聚四氟乙烯的摩擦系数较小(压紧应力大于4MPa，摩擦系数为0.035~0.04)，预紧时垫片易向外滑移，所以最好采用凹凸式法兰面。当采用平面法兰时，可将垫片外径接触螺栓，利用螺栓阻止垫片外滑。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t由于搪玻璃设备是在金属表面喷涂了一层瓷釉后烧结而成的，釉层很脆，加之喷涂不均匀和釉层流动，法兰表面平面度较差。采用金属复合型垫片易损坏釉层，所以推荐使用芯材由石棉板加橡胶的聚四氟乙烯包垫。这种包垫既容易与法兰面贴合又耐腐蚀，使用效果良好。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t有许多厂在温度、压力不高的强腐蚀介质中，采用石棉橡胶板外缠聚四氟乙烯生料带，用于经常拆卸的人孔、管道上。由于制作、使用方便，颇受欢迎。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t4  、石棉树脂板和浸渍石棉板垫片\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t多用于各种酸性介质的管道、泵、阀、进出口法兰，其使用温度在80℃、压力在0.6MPa以下。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t石棉编制垫片适用于压力0.1MPa以下，温度不超过800℃的低压、高温工况。并可根据设备的具体要求，编织成不通宽度、厚度、直径的垫片。或将石棉带剪下后直接敷在法兰表面。它用于大型硫酸、硝酸氧化炉以及一些未经加工的设备接口处，效果远远超过原来的石棉绳。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t5 、金属包石棉垫\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t由金属薄板包覆石棉板或石棉橡胶板，使其不与介质直接接触，避免了石棉纤维强度下降，客服了渗漏现象，从而扩大了石棉橡胶板的使用范围。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t一般金属包石棉垫使用温度为450℃(个别也有达600~700℃，如在常压~0.16MPa的烟道气中)，使用压力为4MPa，最高可达6MPa。如压力再增高，垫片易产生横流现象，芯材从搭接处挤出。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t由于金属包石棉垫需要较大的螺栓拧紧力，即使当使用压力低于2.45MPa，也不能采用pg25公斤级以下的法兰。否则，法兰、螺栓的刚度就显得不够，产生变形而导致密封失效。有人认为，若将芯材改为弹性较好的合成橡胶，其紧固力就会下降。其实不然，因为芯材改软后，紧固力被芯材吸收，不能提供金属板在法兰面上贴合所需的紧固力，包垫反容易被极坏。另外，在含氯离子较多的介质以及酸性介质中，不锈钢包垫及铁皮包垫的搭接处易产生缝隙腐蚀。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t温度高于450℃，芯材可使用陶瓷纤维或碳纤维。某钢铁厂采用金属包陶瓷纤维垫片用于1100℃的高温，使用二年尚未损坏。柔性石墨作芯材是最合适的。目前，国内已批量生产金属包柔性石墨垫。其使用效果优于金属包石棉垫。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t金属包垫能制成各种形状，大量用于各种热交换器、反应器的大盖、装卸孔、人孔法兰等。国内曾制作过直径为2m的铁包垫，使用情况良好。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t在金属包垫的表面贴覆一层柔性石墨薄板，这种垫片与表面未包覆的同类金属包垫相比，预紧比压较小，密封性能更佳。图2-9为两者压紧应力与泄漏量的关系曲线。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t目前国内尚无此产品，故有的单位将现有的柔性石墨皱纹带贴在金属包垫以及金属平垫、齿形垫甚至石棉橡胶垫表面，解决了许多泄漏难题。例如某厂的热交换器，压力为5.88MPa、温度450℃，介质为氢\u002F油气。曾用过金属平垫、齿形垫，均有泄漏。后在平垫上贴了柔性石墨皱纹带，解决了这一问题。应该指出，这种垫片形式是一种解决法兰垫片泄漏的简便措施，贴覆柔性石墨带的工作性质量直接影响设备能否正常运转。若在带材背面涂刷一层胶水，可提高贴覆质量。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t6 、金属缠绕垫 \n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t金属缠绕垫巧妙地利用金属的耐热性、回弹性和强度以及非金属材料的柔软性，所以密封性能较好，其中又以不锈钢带缠绕柔性石墨垫的性能为最佳。其预紧比压较石棉缠绕垫小，不存在石棉纤维毛细孔渗漏的缺点。图2-10为两者预紧比压与泄漏量的关系曲线。在油介质中，金属带材多使用0Cr13，而其它介质则推荐使用1Cr18Ni9Ti。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t不锈钢带柔性石墨缠绕垫在气体介质中，使用压力为14.7MPa(国内有高达19.6MPa)，在液体中可用至30MPa。温度-190~+600℃(在无氧、低压情况下可用至1000℃)。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t聚四氟乙烯的耐低温性能良好，它在低温下的屈服强度大大高于常温时的强度。所以聚四氟乙烯缠绕垫可用于低温介质，如液态烃等。同时，因加入金属带提高了导热性，聚四氟乙烯缠绕垫使用温度可达250℃，在酸性介质中可用至9MPa、200℃。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t缠绕垫用于压力和温度波动较大的换热器、反应器、管道、阀门、泵进出口法兰较为合适。对于中等以上压力、温度超过300℃者，应考虑使用带内环、外环或内外环。若使用凹凸面法兰，配带内环的缠绕垫效果更好些。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t在柔性石墨缠绕垫两面贴覆柔性石墨板也能取得好的密封效果。某大型化肥厂废热锅炉属高温高压关键设备，用带外环的柔性石墨缠绕垫，满负荷时不漏，减负荷时则漏。在垫片两面增加了0.5mm厚的柔性石墨板，剪成圆弧状，接头部分采用斜口搭接，使用情况良好。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t7 、金属平垫和金属波形垫\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t一般用于中、高压阀门、管道和直径较小的设备法兰上。使用压力则根据温度的不同，前者为1.568~31.36MPa，后者为1.568~3.92MPa。垫片材质根据介质和温度选取。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t8 、八角垫和椭圆垫\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;text-align:justify;text-indent:2em;\">\n\t\t用于梯形槽面法兰的八角垫和椭圆垫(炼油行业俗称“土钢圈”)密封性能均好。在沟槽的锥面上，八角垫为面接触而椭圆垫是线接触。因此，椭圆垫在低紧固力下贴合性好，但需进行二次紧固;而八角垫一般一次紧固后，不易出现泄漏。它们的不足之处为要求较大的螺栓拧紧力，当用于低压高温情况时，法兰等级须在 pg25公斤级以上。\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\t\u003Cp style=\"font-size:medium;\">\n\t\t\u003Cbr \u002F>\n\t\u003C\u002Fp>\n\u003C\u002Fdiv>",{"requestId":965,"contractVersion":8},"8b553222-36a9-45ed-afcd-d11f7f96e335",{"code":4,"message":4,"data":967,"meta":970},[968,969],{"id":640,"contentKey":641,"contentGroup":91,"contentType":152,"label":642,"valueText":5,"mediaUrl":613,"mediaWidth":5,"mediaHeight":5,"mediaSize":5,"mediaMimeType":5,"linkUrl":5,"orderNum":47,"webFlag":47,"locale":12,"helpText":155,"crtId":5,"crtDate":156,"updId":5,"updDate":588},{"id":644,"contentKey":645,"contentGroup":91,"contentType":152,"label":646,"valueText":5,"mediaUrl":618,"mediaWidth":5,"mediaHeight":5,"mediaSize":5,"mediaMimeType":5,"linkUrl":5,"orderNum":8,"webFlag":47,"locale":12,"helpText":155,"crtId":5,"crtDate":156,"updId":5,"updDate":588},{"requestId":971,"contractVersion":8},"12c83eee-f90d-49cd-b2e3-3d70fe169054"]