1. 伴管管徑及(ji)根(gen)數的選用
①. 伴(ban)管(guan)管(guan)徑宜為10、12、DN15、DN20、DN25，伴(ban)管(guan)根(gen)數不宜超(chao)過4根(gen)。
②. 在不同(tong)環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)及工藝(yi)操作條件下，蒸(zheng)汽伴(ban)管(guan)(guan)管(guan)(guan)徑(jing)及根(gen)數從SH／T 3040提供的(de)四個表（表1蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)143℃／183℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)5℃；表2蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)143℃／183℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)-5℃；表3蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)143℃／183℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)-15℃；表4蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)143℃／183℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)-25℃）中選擇；熱水伴(ban)管(guan)(guan)管(guan)(guan)徑(jing)及根(gen)數從SH／T 3040提供的(de)四個表（表5蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)90℃／100℃／110℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)5℃；表6蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du) 90℃／100℃／110℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)-5℃；表7蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)90℃／100℃／110℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)-15℃；表8蒸(zheng)汽伴(ban)管(guan)(guan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)90℃／100℃／110℃、環(huan)境(jing)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)-25℃）中選擇。
③. 環境溫(wen)(wen)(wen)度、伴(ban)管介質的操(cao)作(zuo)條件、保溫(wen)(wen)(wen)材料(liao)制品(pin)的熱導(dao)率及傳熱系數(shu)(shu)等(deng)數(shu)(shu)據與表(biao)1～表(biao)8不同時(shi)，伴(ban)管管徑及根數(shu)(shu)（采用硬質或半硬質圓形(xing)保溫(wen)(wen)(wen)材料(liao)制品(pin)）按下(xia)面公式計(ji)算。
2. 蒸汽(qi)分配站(zhan)(zhan)和(he)疏水站(zhan)(zhan)
①. 對于蒸(zheng)汽(qi)分配站和(he)疏水站的管徑也給出了下面的公式，計算(suan)出S值，再查詢SH3040相應的表格來獲(huo)得蒸(zheng)汽(qi)分配站和(he)疏水站的管徑。
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(zai)3m半徑范圍內(nei)如有3個(ge)或3個(ge)以上的伴(ban)熱(re)(re)點(dian)及回(hui)收點(dian)時(shi)，蒸(zheng)汽(qi)伴(ban)熱(re)(re)系統(tong)應設置蒸(zheng)汽(qi)分(fen)配站和(he)疏水(shui)站，熱(re)(re)水(shui)伴(ban)熱(re)(re)系統(tong)應設置熱(re)(re)水(shui)分(fen)配站和(he)熱(re)(re)水(shui)回(hui)水(shui)站。站的設置應考慮統(tong)一考慮，布局合理，方便操作和(he)維(wei)修。
3. 蒸汽(qi)伴(ban)管(guan)沿(yan)被伴(ban)熱管(guan)的最大允(yun)許有效(xiao)伴(ban)熱長度（包括垂直管(guan)道）（表6-34）
凝結水不回收時，最(zui)大(da)允(yun)許有效(xiao)伴熱長度可延長20％；采用導熱膠(jiao)泥時，最(zui)大(da)允(yun)許有效(xiao)伴熱長度宜縮短20％；對于出現(xian)U形彎(wan)時，在超過規定數值（蒸(zheng)汽(qi)壓力(li)(li)0.3～0.5MPa，累計(ji)(ji)上(shang)(shang)升4m；蒸(zheng)汽(qi)壓力(li)(li)大(da)于0.5～0.7MPa，累計(ji)(ji)上(shang)(shang)升5m；蒸(zheng)汽(qi)壓力(li)(li)大(da)于0.7～1MPa，累計(ji)(ji)上(shang)(shang)升6m）時宜適當減少(shao)最(zui)大(da)允(yun)許有效(xiao)伴熱長度，但伴管(guan)累計(ji)(ji)上(shang)(shang)升高度不宜超過10m。
注：1. 蒸(zheng)(zheng)汽(qi)(qi)分配(pei)(pei)站安裝位置高于(yu)蒸(zheng)(zheng)汽(qi)(qi)總(zong)管(guan)時(shi)，分配(pei)(pei)站低點可(ke)不(bu)設排(pai)放冷(leng)凝(ning)水(shui)的蒸(zheng)(zheng)汽(qi)(qi)疏水(shui)閥系(xi)統(tong)，水(shui)平(ping)安裝的分配(pei)(pei)站應無袋(dai)形(xing)(xing)并坡向蒸(zheng)(zheng)汽(qi)(qi)總(zong)管(guan)。蒸(zheng)(zheng)汽(qi)(qi)分配(pei)(pei)站低于(yu)蒸(zheng)(zheng)汽(qi)(qi)總(zong)管(guan)時(shi)，其上游不(bu)得有下凹的袋(dai)形(xing)(xing)彎，分配(pei)(pei)站的低點應設蒸(zheng)(zheng)汽(qi)(qi)疏水(shui)閥組(zu)。
2. 蒸(zheng)汽(qi)(qi)分配(pei)站至少有3根伴管（DN15）送至半(ban)徑為(wei)3m范圍(wei)內的(de)地(di)點時才設置，否則伴熱供汽(qi)(qi)管可直接從蒸(zheng)汽(qi)(qi)總管上(shang)引出。
3. 分配站應布置在不妨礙通(tong)行、便(bian)于操作(zuo)的地(di)方，布置應考慮整齊和美觀(guan)。
4. 供汽管(guan)的(de)閥門應布(bu)置在便(bian)于接(jie)近的(de)地方。
5. 分配站(zhan)的(de)蒸(zheng)汽(qi)應(ying)從(cong)蒸(zheng)汽(qi)總管(guan)的(de)頂部引出。
4. 熱水伴(ban)管沿被伴(ban)熱管的最大允(yun)許有效(xiao)伴(ban)熱長度（包(bao)括垂直管道）（表6-35）
注(zhu)：按SH／T 3040，應注(zhu)意有效伴熱長度(du)和其他標(biao)準規定的(de)數值的(de)不(bu)同，根(gen)據項目實際(ji)情況選用。
注：按(an) SH／T 3040，應注意有效伴熱長度和其他標(biao)準規定的(de)數值的(de)不同，根(gen)據項目實(shi)際(ji)情況(kuang)選用。
