螺旋鋼(gāng)管(guǎn)水壓計(jì)算公式(shì):
水(shuǐ)壓值(zhí)計算公式(shì) P=2ST/D (P:靜(jìng)水(shuǐ)壓試(shì)驗的(de)試(shì)驗(yàn)壓力,單(dān)位(wèi)Mpa,1Mpa≈ 10kg;S:靜水(shuǐ)壓試(shì)驗(yàn)的(de)試(shì)驗應(yīng)力;T:鋼管標(biāo)稱壁(bì)厚(hòu);D:鋼(gāng)管(guǎn)標稱管(guǎn)徑(jìng)),並(bìng)精(jīng)確(què)到0.1Mpa。
舉(jǔ)例(lì)計算(suàn)水壓(yā):螺旋鋼(gāng)管爲(wèi)325*8,材質(zhì)爲(wèi)Q235B,S就是(shì)Q235B材質屈服(fú)的(de)60%,也(yě)就(jiù)是(shì)235*0.6=141,T=8,D=325 P=2*141*8/325=6.9Mpa 也就(jiù)是(shì)說(shuō)325*8的(de)螺(luó)旋(xuán)鋼(gāng)管水壓試驗(yàn)是6.9Mpa.
靜(jìng)水(shuǐ)壓試驗(yàn)的(de)試驗應力(lì)按相應鋼帶標(biāo)準(zhǔn)規(guī)定屈(qū)服(fú)強度最(zuì)小值(zhí)的(de)60%選取,對於(yú)標稱(chēng)外(wài)徑(jìng)小(xiǎo)於(yú)508mm的螺(luó)旋(xuán)鋼(gāng)管(guǎn),靜水壓試(shì)驗的(de)壓(yā)力保(bǎo)持(chí)時間(jiān)不(bù)少於(yú)5s,對(duì)於標稱(chēng)外(wài)徑(jìng)不小(xiǎo)於508mm的(de)螺旋(xuán)鋼(gāng)管(guǎn),靜(jìng)水(shuǐ)壓(yā)試驗的(de)壓力保(bǎo)持(chí)時(shí)間(jiān)不少(shǎo)於10s.