bck2ftr
Mechanical
- Feb 7, 2014
- 16
My query is regarding consideration of factor f as stated in Table 9.3.1-1 of ASM B16.9
One of our supplier submitted proof test records wherein he has used an assembly of two equal tees, two 90 deg elbows and two caps of 4" size 10 mm thickness.
In proof test calculations, he considered factor of 1. I had observed that factor shall be 1.05 if he had used two numbers of geometrically identical fittings.
To this, our supplier's argument is as following:
For the selection of the test factor, we have ensured consistency in the following parameters:
• Same size
• Same wall thickness
• Same material grade
• Same heat lot
Additionally, three or more geometrically similar fittings, manufactured using the same method, were considered. We have conducted three mechanical test specimens accordingly.
Request veterans in the fittings industry to throw light on the above argument.
One of our supplier submitted proof test records wherein he has used an assembly of two equal tees, two 90 deg elbows and two caps of 4" size 10 mm thickness.
In proof test calculations, he considered factor of 1. I had observed that factor shall be 1.05 if he had used two numbers of geometrically identical fittings.
To this, our supplier's argument is as following:
For the selection of the test factor, we have ensured consistency in the following parameters:
• Same size
• Same wall thickness
• Same material grade
• Same heat lot
Additionally, three or more geometrically similar fittings, manufactured using the same method, were considered. We have conducted three mechanical test specimens accordingly.
Request veterans in the fittings industry to throw light on the above argument.
