Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
(OP)
I would like to know a "general" guideline for the burst pressure of a Class 125 and a Class 250 cast iron fitting? I have looked into ASME B16.4 and it does not mention what the burst pressure is, or what the assumed safety factor is. I am just looking into obtaining some information on the actual test pressure that these cast iron fittings fail. Also, any reference or resource would be appreciated. Thanks.





RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
--Most often, the flanges will deform and leak, preventing further increases in pressure. Bolts can break
--Someimes a piping weld or threaded joint can fail. This can be the weld to the flange
--Sometimes a valve can leak through the stem.
The burst failure of the flange itself is hard to make happen....
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
We are currently performing a metallurgical analysis on the cast iron fitting to determine its material properties, etc. If no material issues/defects are determined to be the cause of failure then our client would like to obtain the possible failure pressure of a typical fitting so that they can diagnose any system issues that may be causing the over-pressure. Thanks.
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
Regards
Stonecold
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
Water hammer or other shock loads will shatter cast iron. My previous employer stopped using cast iron in all water and steam lines for that reason, only malleable iron or steel. I have seen a pipe fitter shatter a cast iron fitting with a hammer that he was removing/demolishing.
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
Either way it looks like there is no specific standard describing what the actual cast iron fitting burst pressure is. I would assume that someone has done some testing to determine the actual pressure?
VerneE - Do you have any idea what the water hammer or shock failure pressures were for those cast iron fittings? Are there any papers or articles describing this type of testing on cast iron fittings?
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
good luck!!
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
rconnor - The fitting is a 1 1/2" x 1 1/4" x 1" reducing tee. The fitting has no markings except for a "G" cast on the outside. This fitting is used in the water system of a commercial building.
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?
RE: Burst Pressure of a Class 125 and a Class 250 cast iron fitting?