Dimensions Flashcards
Design – mill tolerance for rolled and welded pipe
-0.010”
NDE - Maximum length of crack, or incomplete fusion allowed on a new weld
0”
Flanges – typical flange face finish
125–250 micro-inch
Flanges – when mating flanges, the maximum amount of unparallel allowed (per diameter of flange in feet)
1/16” per foot
Flanges – Max offsets for bolt – holes for meeting flanges
1/8”
Welding – maximum allowed size of open discontinuity in a bend test
1/8”
Welder – thickness to qualify welder with UT
Greater than or equal to 1/4”
NDE – minimum distance beyond the area to be examined to clean a part when performing a MT examination
1”
NDE – minimum distance beyond the area to be examined to clean a part when performing a PT examination
1”
Repairs – minimum radius of insert patch
1”
Repairs – minimum radius of fillet – weld patch
1”
NDE – suggested diameter of CML exam point
2”
Preheat zone - Distance from start of weld
Greater of 3” or 1.5 T
PWHT zone – minimum width of band
3T
NDE – minimum length of spot RT
6”
Weld qualify – minimum weld length when qualifying a welder with RT/UT using a coupon or first production weld
6”
Weld qualify – minimum weld length when qualifying a welding operator with RT/UT of a test coupon 
6”
Corrosion – soil-to-air area – distance in air from interface
6”
Corrosion – distance to dig when inspecting for soil to air corrosion
6-12”
NDE – distance of eyes –to– part to count as a visual exam
6-24”
Corrosion – soil to air area – distance in soil from interface
12”
NDE – minimum upstream limit of intensive examination of injection point circuit
12”
PWHT – minimum overlap for PWHT when using multiple heats
12”
Weld qualify – minimum weld length when qualifying a welding operator with RT/UT of first Production weld
3 feet
Underground – minimum length of buried pipe to expose when excavating for inspection
6-8’
Repairs – maximum size of fillet weld patch on pipe
1/2 diameter
Circuits – minimum upstream limit of injection point circuit
Greater of 12 inch or 3 Diameter
NDE – minimum downstream limit of intensive examination of injection point circuit
10 Diameters
Circuits – min downstream limit of injection point circuit
Lesser of: 1st direction change +25 feet, or 2nd direction change
Linear indication
Length is > 3 times width
