Instructions for pipe roll grooving

“A” Dimension -The “A” dimension, or the distance from the pipe end to the groove,
identifies the gasket seating area. This area must be free from indentations, projections (including weld seams), and roll marks from the pipe end to the groove to ensure a leak tight seal for the gasket. All foreign material, such as loose paint, scale, oil, grease, chips, rust, and dirt must be removed.
“B” Dimension – The “B” dimension, or groove width, controls expansion, contraction, and angular deflection of flexible couplings by the distance it is located from the pipe and its width in relation to the coupling housings’ “key” width. The bottom of the groove must be free of all foreign material, such as dirt, chips, rust, and scale that may interfere with proper coupling assembly.

“C” Dimension – The “C” dimension is the proper diameter at the base of the groove.
This dimension must be within the diameter’s tolerance and concentric with the
OD for proper coupling fit. The groove must be of uniform depth for the entire pipe
circumference.
“D” Dimension – The “D” dimension is the normal depth of the groove and is a reference for a “trial groove” only. Variations in pipe
O. D. affect this dimension and must be altered, if necessary, to keep the “C” dimension within tolerance. This groove must conform to the “C” dimension described above.
“T” Dimension – The “T” dimension is the lightest grade (minimum, nominal wall
thickness) of pipe that is suitable for cut or roll grooving.
“F” Standard Roll Groove Only – Maximum allowable pipe-end flare diameter is
measured at the extreme pipe-end diameter.

For roll groove specification, please refer Table 1A.

Instructions for Pipe Cut Grooving

“A” dimension -The “A” dimension, or the distance from the pipe end to the groove,
identifies the gasket seating area. This area must be free from indentations, projections (including weld seams), and roll marks from the pipe end to the groove to ensure a leak tight seal for the gasket. All foreign material, such as loose paint, scale, oil, grease, chips, rust, and dirt must be removed.
“B” Dimension – The “B” dimension, or groove width, controls expansion, contraction, and angular deflection of flexible couplings

by the distance it is located from the pipe and its width in relation to the coupling housings’ “key” width. The bottom of the groove must be free of all foreign material, such as dirt, chips, rust, and scale that may interfere with proper coupling assembly.
“C” Dimension – The “C” dimension is the proper diameter at the base of the groove.
This dimension must be within the diameter’s tolerance and concentric with the
OD for proper coupling fit. The groove must be of uniform depth for the entire pipe
circumference.
“D” Dimension – The “D” dimension is the normal depth of the groove and is a reference for a “trial groove” only. Variations in pipe
O.D .affect this dimension and must be altered, if necessary, to keep the “C” dimension within tolerance. This groove must conform to the “C” dimension described above.
“T” Dimension – The “T” dimension is the lightest grade (minimum, nominal wall
thickness) of pipe that is suitable for cut or roll grooving.