角(Jiao)钢(Gang)法(Fa)兰(Lan)制(Zhi)作(Zuo)
((?)1)(?)法(Fa)兰(Lan)的(De)角(Jiao)钢(Gang)下(Xia)料(Liao)时(Shi)应(Ying)注(Zhu)意(Yi)使(Shi)焊(Han)成(Cheng)后(Hou)的(De)法(Fa)兰(Lan)内(Nei)径(Jing)不(Bu)能(Neng)小(Xiao)于(Yu)风(Feng)管(Guan)的(De)外(Wai)径(Jing)。(?)
((?)2)(?)下(Xia)料(Liao)调(Diao)直(Zhi)后(Hou)放(Fang)在(Zai)相(Xiang)应(Ying)的(De)模(Mo)具(Ju)上(Shang)卡(Ka)紧(Jin)固(Gu)定(Ding)、(?)焊(Han)接(Jie)、(?)打(Da)眼(Yan)。(?)
((?)3)(?)根(Gen)据(Ju)通(Tong)风(Feng)系(Xi)统(Tong),(?)按(An)规(Gui)范(Fan)规(Gui)定(Ding),(?)法(Fa)兰(Lan)螺(Luo)栓(Shuan)孔(Kong)及(Ji)铆(Mao)钉(Ding)孔(Kong)间(Jian)距(Ju)要(Yao)符(Fu)合(He)要(Yao)求(Qiu),(?)法(Fa)兰(Lan)四(Si)角(Jiao)处(Chu)开(Kai)设(She)螺(Luo)栓(Shuan)孔(Kong)。(?)
((?)4)(?)法(Fa)兰(Lan)螺(Luo)孔(Kong)间(Jian)距(Ju)必(Bi)须(Xu)均(Jun)匀(Yun),(?)同(Tong)规(Gui)格(Ge)法(Fa)兰(Lan)具(Ju)备(Bei)互(Hu)换(Huan)性(Xing)。(?)
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