Antifed
Mechanical
- Dec 19, 2005
- 27
Hello All,
A project I am working on now is a valve replacement in a 24" bypass line at one of our dams. The bypass line and valve has been in service for about 50 years.
The original specs we have state that the bypass pipe is to be carbon steel pipe (equiv. to ASTM A 53, Elec. Resist. Welded, Grade A) to be manufactured from 1/4" thick steel sheet. Looking at the charts in the ASTM, this would indicate SCH 10 for a 24" pipe.
A majority of the pipeline is located within a concrete wall. Only a small portion of the line is exposed where the valve is located. The piping protruding from the wall is coupled to the exposed piping with Dresser No. 38 couplings at each end.
If reasons dictate that a different schedule pipe is required (for example SCH 20, aka Std Weight for 24" A 53 pipe), will there be a problem due to the 1/8" difference is wall thickness (erosion, flow problems, etc.)?
Thank you,
A project I am working on now is a valve replacement in a 24" bypass line at one of our dams. The bypass line and valve has been in service for about 50 years.
The original specs we have state that the bypass pipe is to be carbon steel pipe (equiv. to ASTM A 53, Elec. Resist. Welded, Grade A) to be manufactured from 1/4" thick steel sheet. Looking at the charts in the ASTM, this would indicate SCH 10 for a 24" pipe.
A majority of the pipeline is located within a concrete wall. Only a small portion of the line is exposed where the valve is located. The piping protruding from the wall is coupled to the exposed piping with Dresser No. 38 couplings at each end.
If reasons dictate that a different schedule pipe is required (for example SCH 20, aka Std Weight for 24" A 53 pipe), will there be a problem due to the 1/8" difference is wall thickness (erosion, flow problems, etc.)?
Thank you,
