Hi, my name is Cristian, an i have a doubt about what parts of the flush type cleanout fitting shall be thermally stress relieved, because in point 5.7.7.3. the standard says that the reinforced opening shall be preassembled in a shell plate, and the complete unit shall be thermally stress relieved; so this includes the flange, neck, bottom reinforcement, shell and shell reinforcement?
On other way, in point 5.7.4.1. the standard says that "the assembly shall include the bottom reinforcing plate (or annular plate) and the flange-to-neck weld". It doesn´t says anything about the shell and the shell reinforcement...
How should i understand this? What parts should be thermally stress relieved?
And the last question... If i should made the thermal stress relieved to the complete unit including everything like i understand in point 5.7.7.3., the width of the shell plate should be suitable so that the complete unit can be introduce into an oven for the heat treatment... so it should be a small lenght, depending the size of the oven. When this complete units is introduced into the oven for the stress relief with a temperature range of 600 to 650 ºC, will it deform? I'm worried that the curvature of the shell will deform...
Sorry for my english, i'm from Argentina.
The diameter of the tank es 30 meters and 14 meters of height. The thickness of the first shell course is 14.3 mm, of the anular plates is 9.5 mm, of the bottom reinforcement es 31.8 mm, of the shell reinforcement 15.5 mm, of the neck of the flush cleanout es 15.5 mm and of the flange is 25.4 mm. All the materials are ASTM A-36.
-- On other way, in point 5.7.4.1. the standard says that "the assembly shall include the bottom reinforcing plate (or annular plate) and the flange-to-neck weld". It doesn´t says anything about the shell and the shell reinforcement...
How should i understand this? What parts should be thermally stress relieved?
And the last question... If i should made the thermal stress relieved to the complete unit including everything like i understand in point 5.7.7.3., the width of the shell plate should be suitable so that the complete unit can be introduce into an oven for the heat treatment... so it should be a small lenght, depending the size of the oven. When this complete units is introduced into the oven for the stress relief with a temperature range of 600 to 650 ºC, will it deform? I'm worried that the curvature of the shell will deform...
Sorry for my english, i'm from Argentina.
The diameter of the tank es 30 meters and 14 meters of height. The thickness of the first shell course is 14.3 mm, of the anular plates is 9.5 mm, of the bottom reinforcement es 31.8 mm, of the shell reinforcement 15.5 mm, of the neck of the flush cleanout es 15.5 mm and of the flange is 25.4 mm. All the materials are ASTM A-36.
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