1. 伴管(guan)管(guan)徑及根(gen)數(shu)的選用(yong)
①. 伴管(guan)管(guan)徑(jing)宜(yi)為(wei)10、12、DN15、DN20、DN25，伴管(guan)根數不宜(yi)超過4根。
②. 在(zai)不同環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)及(ji)工藝操作條件下(xia)，蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)管(guan)(guan)(guan)(guan)(guan)徑及(ji)根數從(cong)SH／T 3040提供的四(si)個表(biao)(biao)(biao)（表(biao)(biao)(biao)1蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)5℃；表(biao)(biao)(biao)2蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-5℃；表(biao)(biao)(biao)3蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-15℃；表(biao)(biao)(biao)4蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)143℃／183℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-25℃）中(zhong)(zhong)選擇；熱水伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)管(guan)(guan)(guan)(guan)(guan)徑及(ji)根數從(cong)SH／T 3040提供的四(si)個表(biao)(biao)(biao)（表(biao)(biao)(biao)5蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)5℃；表(biao)(biao)(biao)6蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du) 90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-5℃；表(biao)(biao)(biao)7蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-15℃；表(biao)(biao)(biao)8蒸(zheng)(zheng)汽伴(ban)(ban)管(guan)(guan)(guan)(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)90℃／100℃／110℃、環境(jing)(jing)(jing)(jing)(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)-25℃）中(zhong)(zhong)選擇。
③. 環境溫(wen)度、伴(ban)管介質(zhi)的操作條件(jian)、保溫(wen)材料制(zhi)品的熱(re)導率及(ji)傳熱(re)系(xi)數等數據與表(biao)1～表(biao)8不同時，伴(ban)管管徑及(ji)根數（采(cai)用硬(ying)質(zhi)或半硬(ying)質(zhi)圓形保溫(wen)材料制(zhi)品）按下面(mian)公式計(ji)算(suan)。
2. 蒸汽分(fen)配(pei)站和(he)疏水(shui)站
①. 對于蒸汽(qi)分配站(zhan)和疏水站(zhan)的(de)管(guan)徑(jing)也給出(chu)了下(xia)面的(de)公式，計算出(chu)S值，再(zai)查詢SH3040相應(ying)的(de)表格(ge)來獲得蒸汽(qi)分配站(zhan)和疏水站(zhan)的(de)管(guan)徑(jing)。
S=A+2B+3C 式中A-DN15、612、10伴(ban)管根數；B-DN20伴(ban)管根數；C-DN25伴(ban)管根數。
②. 在3m半徑范圍(wei)內(nei)如(ru)有(you)3個或3個以上的(de)伴熱點及回收點時，蒸汽伴熱系(xi)統(tong)(tong)應(ying)設置(zhi)蒸汽分(fen)配(pei)站(zhan)和(he)疏水站(zhan)，熱水伴熱系(xi)統(tong)(tong)應(ying)設置(zhi)熱水分(fen)配(pei)站(zhan)和(he)熱水回水站(zhan)。站(zhan)的(de)設置(zhi)應(ying)考慮(lv)統(tong)(tong)一考慮(lv)，布局(ju)合(he)理，方便操作和(he)維修。
3. 蒸汽伴(ban)管沿(yan)被伴(ban)熱管的(de)最大允許(xu)有效伴(ban)熱長(chang)度(du)（包括垂直管道）（表6-34）
凝結水不(bu)回(hui)收時(shi)，最(zui)(zui)大允許(xu)有(you)效伴(ban)熱(re)(re)長度可延長20％；采用導(dao)熱(re)(re)膠泥(ni)時(shi)，最(zui)(zui)大允許(xu)有(you)效伴(ban)熱(re)(re)長度宜(yi)(yi)縮短(duan)20％；對于(yu)(yu)出(chu)現U形(xing)彎時(shi)，在超過規定(ding)數值（蒸汽(qi)壓力(li)0.3～0.5MPa，累計(ji)上升4m；蒸汽(qi)壓力(li)大于(yu)(yu)0.5～0.7MPa，累計(ji)上升5m；蒸汽(qi)壓力(li)大于(yu)(yu)0.7～1MPa，累計(ji)上升6m）時(shi)宜(yi)(yi)適當減少最(zui)(zui)大允許(xu)有(you)效伴(ban)熱(re)(re)長度，但伴(ban)管(guan)累計(ji)上升高度不(bu)宜(yi)(yi)超過10m。
注：1. 蒸(zheng)汽(qi)(qi)分(fen)配站(zhan)(zhan)(zhan)安(an)裝位置高于(yu)蒸(zheng)汽(qi)(qi)總(zong)管時(shi)，分(fen)配站(zhan)(zhan)(zhan)低(di)點(dian)可不設(she)排放(fang)冷(leng)凝水的(de)蒸(zheng)汽(qi)(qi)疏水閥系統(tong)，水平安(an)裝的(de)分(fen)配站(zhan)(zhan)(zhan)應無袋形并坡向蒸(zheng)汽(qi)(qi)總(zong)管。蒸(zheng)汽(qi)(qi)分(fen)配站(zhan)(zhan)(zhan)低(di)于(yu)蒸(zheng)汽(qi)(qi)總(zong)管時(shi)，其上(shang)游(you)不得有下凹的(de)袋形彎，分(fen)配站(zhan)(zhan)(zhan)的(de)低(di)點(dian)應設(she)蒸(zheng)汽(qi)(qi)疏水閥組。
2. 蒸(zheng)(zheng)汽分配(pei)站至少有3根伴管（DN15）送至半徑(jing)為3m范圍內的(de)地點時才設(she)置，否則伴熱供汽管可(ke)直接從蒸(zheng)(zheng)汽總(zong)管上引(yin)出。
3. 分配站應(ying)布(bu)置在不妨礙通行、便于操(cao)作的地方(fang)，布(bu)置應(ying)考慮(lv)整齊和美觀(guan)。
4. 供(gong)汽管的(de)(de)閥門應布置在便于接近的(de)(de)地方。
5. 分配站(zhan)的(de)蒸汽應從蒸汽總(zong)管的(de)頂部引出。
4. 熱(re)(re)水(shui)伴管沿被伴熱(re)(re)管的最大允許有效伴熱(re)(re)長度(du)（包括垂直管道(dao)）（表6-35）
注：按SH／T 3040，應注意有效伴(ban)熱長度和其他標準規(gui)定(ding)的(de)數值(zhi)的(de)不(bu)同，根據項(xiang)目實際情(qing)況選用。
注(zhu)：按(an) SH／T 3040，應注(zhu)意有(you)效伴熱長度和其(qi)他標準(zhun)規定的數值的不同，根據項目實際情況選(xuan)用。
