Standard BW, SW, Thrd Cross Fitting
Standard BW, SW, Thrd Cross Fitting
(OP)
New day, new question.
We are having an internal discussion about the use of standard piping crosses. One of my colleagues says crosses should not be used. Another colleague doesn't argue, but just states that he has seen standard butt weld crosses in the field, and another colleague says he doesn't understand why crosses cannot be used because they are a standard fitting.
The problem is that nobody can seem to give a definitive reason as to why piping cross fittings should or should not be used. I can admit, I personally have never had one in a design, nor do I recall seeing one in the field.
What are the reasons that piping crosses should not be used?
Is it a bad practice to incorporate crosses in designs?
Do crosses provide issues with streams coming together at the same location in the header rather than being offset and entering the header at different locations?
Is it better to weld two tees fitting to fitting instead of a cross? If so, why?
Thanks
We are having an internal discussion about the use of standard piping crosses. One of my colleagues says crosses should not be used. Another colleague doesn't argue, but just states that he has seen standard butt weld crosses in the field, and another colleague says he doesn't understand why crosses cannot be used because they are a standard fitting.
The problem is that nobody can seem to give a definitive reason as to why piping cross fittings should or should not be used. I can admit, I personally have never had one in a design, nor do I recall seeing one in the field.
What are the reasons that piping crosses should not be used?
Is it a bad practice to incorporate crosses in designs?
Do crosses provide issues with streams coming together at the same location in the header rather than being offset and entering the header at different locations?
Is it better to weld two tees fitting to fitting instead of a cross? If so, why?
Thanks





RE: Standard BW, SW, Thrd Cross Fitting
RE: Standard BW, SW, Thrd Cross Fitting
https://www.google.com/search?q=piping+cross+fitti...
Based on all these examples they are made. If they are made there must be a demand for them.
I have used them twice in the past. One was on a Urea Plant and the other was a Cumene Expansion Project in a very cold climate.
Both cases where I needed them I had one supply line splitting to three valved destination with a "minimum dead leg" requirement between the cross and the block valve on each branch.
Sometimes its possible to do all the right things and still get bad results
RE: Standard BW, SW, Thrd Cross Fitting
RE: Standard BW, SW, Thrd Cross Fitting
RE: Standard BW, SW, Thrd Cross Fitting
The Cumene plant example (I am not sure but) I think it was 1-of-3. The commodity was a hydrocarbon (Cumene) which would freeze at 40 degrees F with no flow.
Sometimes its possible to do all the right things and still get bad results