1. 伴(ban)管管徑及(ji)根數(shu)的(de)選用
①. 伴(ban)管(guan)(guan)管(guan)(guan)徑(jing)宜為(wei)10、12、DN15、DN20、DN25，伴(ban)管(guan)(guan)根(gen)數不宜超過(guo)4根(gen)。
②. 在(zai)不同環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)及(ji)(ji)工藝(yi)操(cao)作條件下，蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)管(guan)(guan)(guan)徑(jing)及(ji)(ji)根(gen)數(shu)(shu)從SH／T 3040提(ti)供(gong)的(de)四(si)(si)個表(biao)(biao)(biao)（表(biao)(biao)(biao)1蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)5℃；表(biao)(biao)(biao)2蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)-5℃；表(biao)(biao)(biao)3蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)-15℃；表(biao)(biao)(biao)4蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)-25℃）中選擇；熱水伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)管(guan)(guan)(guan)徑(jing)及(ji)(ji)根(gen)數(shu)(shu)從SH／T 3040提(ti)供(gong)的(de)四(si)(si)個表(biao)(biao)(biao)（表(biao)(biao)(biao)5蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du)90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)5℃；表(biao)(biao)(biao)6蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du) 90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)-5℃；表(biao)(biao)(biao)7蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du)90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)-15℃；表(biao)(biao)(biao)8蒸(zheng)(zheng)(zheng)汽(qi)(qi)(qi)伴(ban)(ban)(ban)(ban)管(guan)(guan)(guan)溫度(du)(du)(du)(du)90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)溫度(du)(du)(du)(du)-25℃）中選擇。
③. 環境溫(wen)度(du)、伴(ban)管(guan)介質的操作條件、保溫(wen)材(cai)料(liao)制品的熱導率及(ji)傳熱系數(shu)等數(shu)據與表1～表8不同時，伴(ban)管(guan)管(guan)徑及(ji)根(gen)數(shu)（采用(yong)硬質或半硬質圓形保溫(wen)材(cai)料(liao)制品）按(an)下面公式(shi)計算。
2. 蒸汽分(fen)配站和疏水站
①. 對于蒸(zheng)汽分(fen)配站(zhan)和(he)疏(shu)(shu)水(shui)站(zhan)的(de)管徑也給出(chu)了下面的(de)公(gong)式(shi)，計算出(chu)S值，再查詢(xun)SH3040相應(ying)的(de)表格(ge)來獲得蒸(zheng)汽分(fen)配站(zhan)和(he)疏(shu)(shu)水(shui)站(zhan)的(de)管徑。
S=A+2B+3C 式中A-DN15、612、10伴管根數(shu)(shu)；B-DN20伴管根數(shu)(shu)；C-DN25伴管根數(shu)(shu)。
②. 在(zai)3m半徑范圍內如有3個(ge)(ge)或3個(ge)(ge)以上的伴熱(re)(re)點及回(hui)收點時(shi)，蒸汽伴熱(re)(re)系統應(ying)設置(zhi)(zhi)蒸汽分配(pei)(pei)站(zhan)和疏(shu)水站(zhan)，熱(re)(re)水伴熱(re)(re)系統應(ying)設置(zhi)(zhi)熱(re)(re)水分配(pei)(pei)站(zhan)和熱(re)(re)水回(hui)水站(zhan)。站(zhan)的設置(zhi)(zhi)應(ying)考慮統一考慮，布局合(he)理(li)，方便操作和維修。
3. 蒸(zheng)汽伴(ban)管(guan)(guan)沿被伴(ban)熱(re)(re)管(guan)(guan)的最大允許有(you)效(xiao)伴(ban)熱(re)(re)長度（包括垂直(zhi)管(guan)(guan)道）（表6-34）
凝結水不回(hui)收時，最大(da)允(yun)許有(you)效伴(ban)(ban)熱長度可(ke)延長20％；采用導(dao)熱膠泥時，最大(da)允(yun)許有(you)效伴(ban)(ban)熱長度宜縮短20％；對于出現U形彎時，在(zai)超過規定(ding)數值（蒸汽(qi)壓力(li)0.3～0.5MPa，累(lei)計上(shang)升(sheng)4m；蒸汽(qi)壓力(li)大(da)于0.5～0.7MPa，累(lei)計上(shang)升(sheng)5m；蒸汽(qi)壓力(li)大(da)于0.7～1MPa，累(lei)計上(shang)升(sheng)6m）時宜適(shi)當減少最大(da)允(yun)許有(you)效伴(ban)(ban)熱長度，但伴(ban)(ban)管累(lei)計上(shang)升(sheng)高度不宜超過10m。
注：1. 蒸(zheng)汽(qi)(qi)分(fen)(fen)配(pei)(pei)站安裝位置(zhi)高于蒸(zheng)汽(qi)(qi)總(zong)管時(shi)，分(fen)(fen)配(pei)(pei)站低點可不(bu)設排(pai)放冷凝水(shui)的蒸(zheng)汽(qi)(qi)疏(shu)水(shui)閥系統，水(shui)平安裝的分(fen)(fen)配(pei)(pei)站應無袋(dai)形(xing)并(bing)坡向蒸(zheng)汽(qi)(qi)總(zong)管。蒸(zheng)汽(qi)(qi)分(fen)(fen)配(pei)(pei)站低于蒸(zheng)汽(qi)(qi)總(zong)管時(shi)，其上(shang)游不(bu)得(de)有下(xia)凹(ao)的袋(dai)形(xing)彎，分(fen)(fen)配(pei)(pei)站的低點應設蒸(zheng)汽(qi)(qi)疏(shu)水(shui)閥組。
2. 蒸汽分配(pei)站至少有3根伴管(guan)（DN15）送至半徑(jing)為3m范圍內的(de)地點(dian)時才設置，否則伴熱供汽管(guan)可直接從蒸汽總管(guan)上引出。
3. 分(fen)配站應(ying)布置在不妨礙(ai)通行、便于操作的(de)地方(fang)，布置應(ying)考慮整齊和美觀。
4. 供(gong)汽管的(de)閥(fa)門應(ying)布置在便于接近的(de)地方(fang)。
5. 分配站的(de)蒸(zheng)(zheng)汽應從蒸(zheng)(zheng)汽總(zong)管的(de)頂部引出。
4. 熱(re)水伴管沿被伴熱(re)管的最(zui)大允許(xu)有效伴熱(re)長度（包(bao)括垂(chui)直管道）（表6-35）
注(zhu)：按(an)SH／T 3040，應注(zhu)意有效伴熱長度和(he)其他(ta)標準規(gui)定的數值的不(bu)同，根據項目實際(ji)情況選用。
注：按 SH／T 3040，應注意有效伴(ban)熱長(chang)度和(he)其他標準(zhun)規定(ding)的(de)數(shu)值的(de)不(bu)同，根據項(xiang)目(mu)實(shi)際情況選用。
