1. 伴管管徑及根(gen)數(shu)的(de)選用(yong)
①. 伴(ban)管管徑(jing)宜(yi)(yi)為10、12、DN15、DN20、DN25，伴(ban)管根數不宜(yi)(yi)超過4根。
②. 在不同環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)及工藝操(cao)作條件下(xia)，蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)管(guan)(guan)(guan)徑及根數從SH／T 3040提(ti)供的四(si)個(ge)表(biao)(biao)(biao)（表(biao)(biao)(biao)1蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)5℃；表(biao)(biao)(biao)2蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-5℃；表(biao)(biao)(biao)3蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-15℃；表(biao)(biao)(biao)4蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-25℃）中(zhong)選擇；熱水伴(ban)(ban)(ban)管(guan)(guan)(guan)管(guan)(guan)(guan)徑及根數從SH／T 3040提(ti)供的四(si)個(ge)表(biao)(biao)(biao)（表(biao)(biao)(biao)5蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)5℃；表(biao)(biao)(biao)6蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du) 90℃／100℃／110℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-5℃；表(biao)(biao)(biao)7蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-15℃；表(biao)(biao)(biao)8蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)管(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環(huan)(huan)境(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-25℃）中(zhong)選擇。
③. 環境溫度、伴管(guan)介質的操作條件、保溫材(cai)料(liao)制品(pin)的熱導(dao)率及傳熱系(xi)數等數據(ju)與(yu)表1～表8不同時(shi)，伴管(guan)管(guan)徑及根數（采用硬(ying)質或半硬(ying)質圓形保溫材(cai)料(liao)制品(pin)）按(an)下面公式計算。
2. 蒸汽分(fen)配站和疏水站
①. 對(dui)于(yu)蒸汽分配(pei)站和疏(shu)(shu)水(shui)站的(de)管徑(jing)也(ye)給(gei)出了下面的(de)公式(shi)，計(ji)算出S值，再查詢(xun)SH3040相應的(de)表(biao)格來獲得蒸汽分配(pei)站和疏(shu)(shu)水(shui)站的(de)管徑(jing)。
S=A+2B+3C 式中A-DN15、612、10伴(ban)(ban)管根(gen)數(shu)；B-DN20伴(ban)(ban)管根(gen)數(shu)；C-DN25伴(ban)(ban)管根(gen)數(shu)。
②. 在3m半徑范圍內如有3個或3個以上的伴(ban)熱點(dian)及回收點(dian)時，蒸汽伴(ban)熱系統應(ying)設置蒸汽分配站和疏(shu)水站，熱水伴(ban)熱系統應(ying)設置熱水分配站和熱水回水站。站的設置應(ying)考(kao)慮統一考(kao)慮，布局合理，方便操作和維修。
3. 蒸(zheng)汽(qi)伴管(guan)沿被伴熱管(guan)的最大(da)允許有(you)效伴熱長度（包括垂直管(guan)道(dao)）（表6-34）
凝結(jie)水不(bu)回收時，最大(da)允許有(you)(you)效伴熱長(chang)度(du)(du)可延長(chang)20％；采用導(dao)熱膠泥時，最大(da)允許有(you)(you)效伴熱長(chang)度(du)(du)宜縮短20％；對(dui)于出(chu)現(xian)U形彎時，在超過規定(ding)數(shu)值（蒸(zheng)汽(qi)壓(ya)力0.3～0.5MPa，累計(ji)上升(sheng)4m；蒸(zheng)汽(qi)壓(ya)力大(da)于0.5～0.7MPa，累計(ji)上升(sheng)5m；蒸(zheng)汽(qi)壓(ya)力大(da)于0.7～1MPa，累計(ji)上升(sheng)6m）時宜適當減(jian)少最大(da)允許有(you)(you)效伴熱長(chang)度(du)(du)，但伴管累計(ji)上升(sheng)高度(du)(du)不(bu)宜超過10m。
注(zhu)：1. 蒸汽(qi)(qi)分(fen)配(pei)(pei)站(zhan)安裝位置(zhi)高于蒸汽(qi)(qi)總(zong)(zong)管時，分(fen)配(pei)(pei)站(zhan)低點可不設(she)排放冷凝(ning)水的蒸汽(qi)(qi)疏水閥(fa)系統(tong)，水平安裝的分(fen)配(pei)(pei)站(zhan)應無(wu)袋形并坡向蒸汽(qi)(qi)總(zong)(zong)管。蒸汽(qi)(qi)分(fen)配(pei)(pei)站(zhan)低于蒸汽(qi)(qi)總(zong)(zong)管時，其上游(you)不得有下凹的袋形彎，分(fen)配(pei)(pei)站(zhan)的低點應設(she)蒸汽(qi)(qi)疏水閥(fa)組。
2. 蒸汽分配站至(zhi)少(shao)有3根伴(ban)管（DN15）送(song)至(zhi)半徑為3m范圍(wei)內的(de)地點時才設置，否則伴(ban)熱供(gong)汽管可直接從(cong)蒸汽總管上引出。
3. 分配站應布置在不妨礙通行、便于操作的地方，布置應考慮整齊和美觀。
4. 供汽管的閥門應布置在便于接近(jin)的地方。
5. 分配站(zhan)的蒸(zheng)汽應(ying)從蒸(zheng)汽總(zong)管(guan)的頂部引(yin)出。
4. 熱(re)水伴(ban)管沿被伴(ban)熱(re)管的最大允許有效伴(ban)熱(re)長度（包(bao)括垂直管道）（表6-35）
注：按SH／T 3040，應注意有效(xiao)伴熱長度和其他(ta)標(biao)準規定的數值的不同，根據(ju)項目(mu)實(shi)際情況選用(yong)。
注：按 SH／T 3040，應注意有效伴熱長度和(he)其他標(biao)準規定的數值的不同，根據項目(mu)實際(ji)情況選用。
