It stands for Deutsches Normung=German standard and usually applies to dimensional information in the metric system. Hence DN50 is for 50mm.
its the thickness of the pipe wall
A pressure rating refers to the qualified operating pressure that is recommended for a component or a system by the manufacturer. The pressure rating of 12 schedule 40 steel pipe is 370 psi.
schedule is the thickness of the pipe and class is pressure/temperature rating of a fitting or pipe
No, they need to match.
pipe schedule is an American definition to define pipe thickness and how much pressure can the pipe stand, schedules are 10,20,40,80.., pipe schedule is nearly close to the eurobian definition for pipe class.
It stands for Deutsches Normung=German standard and usually applies to dimensional information in the metric system. Hence DN50 is for 50mm.
No
One definition of schedule is "a written or printed list, catalog, or inventory" (http://www.merriam-webster.com/dictionary/schedule). So pipe schedule simply refers to a list of wall thicknesses for given pipe sizes. More specific history can be found on wikipedia: http://en.wikipedia.org/wiki/Nominal_Pipe_Size#History
1/8 pipe schedule
its the thickness of the pipe wall
A pressure rating refers to the qualified operating pressure that is recommended for a component or a system by the manufacturer. The pressure rating of 12 schedule 40 steel pipe is 370 psi.
Pipe schedule systems were used until hydraulic calculations became the norm in the mid 80's. You can tell if the system is pipe scheduled when the piping sizes decreases as you get farther away from the water source (sprinkler riser). The larger mains will reduce as less branch lines and sprinkjlers are being supplied.
schedule is the thickness of the pipe and class is pressure/temperature rating of a fitting or pipe
No, they need to match.
The schedule of a pipe indicates its thickness. The higher the schedule number, the thicker the pipe will be. Shcedule 40 and schedule 80 seem to be the most common.
Pipe schedule tell you something about the wall thickness of a pipe. Higher schedule means thicker wall. The actual thickness must be read from a pipe specification sheet, as it differs from material to material. Typical pipe sch. are Sch 20, 40, 80, 160, XS, XXS.