1. 伴管管徑及(ji)根數的(de)選用
①. 伴管管徑(jing)宜為10、12、DN15、DN20、DN25，伴管根數不宜超過4根。
②. 在(zai)不同環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)及工藝操作(zuo)條(tiao)件下，蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)管(guan)徑及根(gen)數從SH／T 3040提供(gong)的四個(ge)表(biao)(biao)(biao)（表(biao)(biao)(biao)1蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)5℃；表(biao)(biao)(biao)2蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)-5℃；表(biao)(biao)(biao)3蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)-15℃；表(biao)(biao)(biao)4蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)-25℃）中(zhong)(zhong)選擇；熱水(shui)伴(ban)(ban)(ban)管(guan)管(guan)徑及根(gen)數從SH／T 3040提供(gong)的四個(ge)表(biao)(biao)(biao)（表(biao)(biao)(biao)5蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)5℃；表(biao)(biao)(biao)6蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du) 90℃／100℃／110℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)-5℃；表(biao)(biao)(biao)7蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)-15℃；表(biao)(biao)(biao)8蒸汽(qi)(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環(huan)(huan)境(jing)溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)-25℃）中(zhong)(zhong)選擇。
③. 環境溫度、伴管(guan)介質(zhi)(zhi)的(de)操(cao)作條件、保溫材料(liao)制品的(de)熱(re)導(dao)率及傳熱(re)系數等數據與表(biao)1～表(biao)8不同(tong)時，伴管(guan)管(guan)徑及根數（采用硬質(zhi)(zhi)或半硬質(zhi)(zhi)圓形(xing)保溫材料(liao)制品）按下面公式(shi)計(ji)算。
2. 蒸汽分配站和疏水站
①. 對于蒸汽(qi)分配站(zhan)和疏水站(zhan)的管徑(jing)也給出了下面的公式，計算出S值，再查詢SH3040相應(ying)的表格(ge)來獲得蒸汽(qi)分配站(zhan)和疏水站(zhan)的管徑(jing)。
S=A+2B+3C 式中A-DN15、612、10伴(ban)(ban)(ban)管(guan)(guan)根(gen)(gen)數(shu)；B-DN20伴(ban)(ban)(ban)管(guan)(guan)根(gen)(gen)數(shu)；C-DN25伴(ban)(ban)(ban)管(guan)(guan)根(gen)(gen)數(shu)。
②. 在3m半徑范圍內如(ru)有3個或3個以上的(de)伴(ban)熱(re)(re)(re)(re)點及(ji)回收點時，蒸(zheng)(zheng)汽伴(ban)熱(re)(re)(re)(re)系(xi)統(tong)應設(she)置(zhi)(zhi)蒸(zheng)(zheng)汽分配站(zhan)和(he)疏(shu)水(shui)站(zhan)，熱(re)(re)(re)(re)水(shui)伴(ban)熱(re)(re)(re)(re)系(xi)統(tong)應設(she)置(zhi)(zhi)熱(re)(re)(re)(re)水(shui)分配站(zhan)和(he)熱(re)(re)(re)(re)水(shui)回水(shui)站(zhan)。站(zhan)的(de)設(she)置(zhi)(zhi)應考慮統(tong)一(yi)考慮，布局(ju)合理，方便操作和(he)維修。
3. 蒸(zheng)汽伴管沿被伴熱管的最大允許(xu)有效伴熱長度（包括垂直管道）（表6-34）
凝結水不(bu)回收時(shi)，最(zui)大允(yun)(yun)許(xu)(xu)有效伴熱(re)(re)長(chang)度(du)可延長(chang)20％；采(cai)用導熱(re)(re)膠泥(ni)時(shi)，最(zui)大允(yun)(yun)許(xu)(xu)有效伴熱(re)(re)長(chang)度(du)宜(yi)縮短20％；對于出現U形彎時(shi)，在(zai)超過規定(ding)數值（蒸(zheng)汽壓(ya)力0.3～0.5MPa，累(lei)計(ji)上(shang)(shang)升4m；蒸(zheng)汽壓(ya)力大于0.5～0.7MPa，累(lei)計(ji)上(shang)(shang)升5m；蒸(zheng)汽壓(ya)力大于0.7～1MPa，累(lei)計(ji)上(shang)(shang)升6m）時(shi)宜(yi)適(shi)當(dang)減少最(zui)大允(yun)(yun)許(xu)(xu)有效伴熱(re)(re)長(chang)度(du)，但伴管累(lei)計(ji)上(shang)(shang)升高度(du)不(bu)宜(yi)超過10m。
注(zhu)：1. 蒸汽(qi)(qi)(qi)(qi)分(fen)(fen)配(pei)站(zhan)安(an)裝(zhuang)位置高于蒸汽(qi)(qi)(qi)(qi)總管時，分(fen)(fen)配(pei)站(zhan)低(di)點可(ke)不設排放冷凝水(shui)的(de)(de)蒸汽(qi)(qi)(qi)(qi)疏水(shui)閥(fa)系統，水(shui)平安(an)裝(zhuang)的(de)(de)分(fen)(fen)配(pei)站(zhan)應無(wu)袋(dai)形并坡向蒸汽(qi)(qi)(qi)(qi)總管。蒸汽(qi)(qi)(qi)(qi)分(fen)(fen)配(pei)站(zhan)低(di)于蒸汽(qi)(qi)(qi)(qi)總管時，其上游(you)不得有下(xia)凹的(de)(de)袋(dai)形彎，分(fen)(fen)配(pei)站(zhan)的(de)(de)低(di)點應設蒸汽(qi)(qi)(qi)(qi)疏水(shui)閥(fa)組。
2. 蒸汽(qi)分配站至少有3根伴管(guan)（DN15）送至半徑為(wei)3m范(fan)圍內的地點時(shi)才設(she)置，否則伴熱供汽(qi)管(guan)可直接從蒸汽(qi)總管(guan)上引出。
3. 分配(pei)站應布(bu)置(zhi)在不妨(fang)礙通行、便(bian)于(yu)操作的地方，布(bu)置(zhi)應考(kao)慮整齊和美觀(guan)。
4. 供汽(qi)管的閥門應(ying)布置(zhi)在(zai)便于接近的地方。
5. 分配站的(de)蒸(zheng)汽(qi)應從(cong)蒸(zheng)汽(qi)總管(guan)的(de)頂部引出。
4. 熱水(shui)伴(ban)(ban)管沿被(bei)伴(ban)(ban)熱管的最(zui)大允(yun)許(xu)有(you)效伴(ban)(ban)熱長度（包括垂直(zhi)管道(dao)）（表6-35）
注：按SH／T 3040，應注意有效伴熱長度(du)和其他標準(zhun)規定的數值(zhi)的不(bu)同，根據項目(mu)實際情況(kuang)選用。
注(zhu)：按 SH／T 3040，應注(zhu)意有效伴(ban)熱長度(du)和其他(ta)標準(zhun)規定的數值的不同(tong)，根據(ju)項目實際情況選用(yong)。
