Do you have DN150-DN80 variable diameter steel pipe joint?
GB-T12459-2005 seamless butt welded steel pipe, with all the data in it.
Do you have DN150-DN80 variable diameter steel pipe joint? Is there a standard in this respect?What's his length, L? Look at the picture
Such components generally belong to standard parts, which is a national standard. It's easy to procure in the market.See details: "GB/T 12459-2005 steel welded seamless pipe fittings"The L length of DN150-DN80 is 140mm, and is H in the national standardSee below: