英文版管道安装方案范例.doc

Piping installation and construction scheme major construction methods the construction method for metal piping piping installation and construction procedures pipelines prefabrication procedures Construction preparations(material take-over(pipelines surface rust removing(marking(measures check-up(material cutting(bevel machining(weld joints inspection(coupling and alignment(spot weld(check-up((weld joints preheating) (welding(visual inspection(PWT(check and inspection (dimension, hardness, NDT) (pressure test(protection(identification piping installation procedures on the site Delivering prefabricated piping spools to the site(inside pipes cleaning(tubing and support installation(piping spools coupling and alignment and spot weld(check (dimension, weld opening) ((preheating) (welding(visual inspection((PWT) (inspection (dimension, hardness, NDT) (inside pipes purging(system pressure test(corrosion proof and insulation piping cleaning before construction It is necessary to carry out proper surface cleaning of piping regarding specific material and filth conditions, and precautions measures for avoiding environment pollution shall be performed in advance before the cleaning. For carbon steel and low alloy steel it is necessary to remove the loose scale and eroding by grit blasting. For stainless steel it is acceptable to remove surface iron matter at first, and therefore cleaning remnant foreign matters by grit blasting. It is not allowed to share grinding wheels and files for repairing stainless steel or non-ferriferous material and carbon steel material. Should be there weld slugs or like that impurity left, it is necessary to use steel brush for cleaning, while to use stainless steel wire brush for stainless steel piping. piping cutting It is necessary to adopt bevel machine in notching for piping and fittings, while using semi-automated cutting machine for steel plates. It is necessary to use gauge to check opening angle for steel plates and fittings. When