法兰允许用钢板拼接焊制，对长颈法兰应符合GB 150的有关规定。

Blend steel welding of flanges is allowed. Long neck flange should conform to related stipulations of GB 150.

youdao

法兰允许用钢板拼接焊制，对长颈法兰应符合GB 150的有关规定。

Blend steel welding of flanges is allowed. Long neck flange should conform to related stipulations of GB 150.

youdao