P2 Series

KRAIS Tube Expanders

Key Features

Three rolls, Self-feeding adjustable reach tube expander for deep reach expansion. Parallel rolling with long effective double radius rolls. Rolls are self-retained in the cage. An excellent expander for use as a touch-up expansion as well as a hard rolling and re-rolling a leaky tube and for new constructions of Water Tube Boilers, Fire-Tube Boilers, Economizers, Air Heaters. Expanders with 4, 5 rolls, with long rolls or longer reach with 2-inch increments are available on request.

Our K70’s Right Angle Rolling Motors are recommended to be used with this expanders.

Parameters

Tube OD: 1-1/4 inch (31,7 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
16 .065 1.65 1,120 28.45 1,100 27.80 1,299 33.00 P2-280 998 T-290 1/2” 12.7

Tube OD: 1-1/2 inch (38,1 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
7-11 .180-.120 3.04-4.5 1.14-1.26 29.1-32.1 1,140 28.80 1,330 34.00 P2-290 1048 T-290 1/2” 12.7
10-12 .134-.109 2.76-3.4 1.22-1.28 31-32.58 1,173 29.80 1,337 35.00 P2-300 1089 T-290 1/2” 12.7
13-16 .095-.065 1.65-2.40 1.299-1.37 33-34.8 1,251 31.80 1,456 37.00 P2-320 1143 T-320 1/2” 12.7

Tube OD: 1-3/4 inch (44,4 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
8-9 .165-..148 4.20-4.60 1.454-1.420 36-37 1,370 34.80 1,614 41.00 P2-350 RR21A T-370 3/4” 19
10-16 .134-.065 1.65-3.4 1.48-1.618 37.6-41.1 1,448 36.80 1,692 43.00 P2-370 RR22A T-370 3/4” 19

Tube OD: 2 inch (50,8 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
7-10 .180-.134 3.40-4.6 1.640”-1.732” 41.6-44 1,566 39.80 1,811 46.00 P2-400 RR40A T-420 3/4” 19
11-12 .120-.109 2.8-3.04 1.759-1.779 44.7-45.2 1,645 41.80 1,889 48.00 P2-420 RR23A T-420 3/4” 19
13-15 .095-.072 1.82-2.4 1.811-1.854 46-47.1 1,724 43.80 1,968 50.00 P2-440 RR23A T-440 3/4” 19
16 .065 1.65 1,870 47.50 1,842 46.80 2,125 54.00 P2-470 RR24A T-470 3/4” 19

Tube OD: 2-1/4 inch (57,1 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
10-12 .134-.109 2.76-3.4 1.98-2.031 50.3-51.6 1,921 48.80 2,204 56.00 P2-490 RR24A T-490 3/4” 19
14-16 .083-.065 1.65-2.1 2.082-2.118 52.9-53.8 2,039 51.80 2,332 59.00 P2-520 RR25A T-490 3/4” 19

Tube OD: 2-1/2inch (63,5 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
11-12 .120-.109 2.8-3.04 2.259-2.279 57.4-57.9 2,118 53.80 2,440 62.00 P2-540 RR26A T-540 3/4” 19
13-16 .095-.065 1.6-2.4 2.311-2.374 58.7-60.3 2,236 56.80 2,598 66.00 P2-570 RR27A T-570 3/4” 19

Tube OD: 2-3/4 inch (69,8 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
7-11 .180-.120 3.04-4.6 2.385-2.508 60.6-63.72 2,354 59.80 2,716 69.00 P2-600 RR28A T-570 3/4” 19

Tube OD: 3 inch (76,2 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
7-11 .180-.120 3.04-4.6 2.637-2.76 67-70.12 2,551 64.80 2,952 74.00 P2-650 RR29A T-650 3/4” 19
13-15 .095-.072 2.4-1.82 2.811-2.856 71.4-72.56 2,669 67.80 3,070 78.00 P2-680 RR30A T-720 1” 25.4

Tube OD: 3-1/4 inch (82,55 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
7-12 .180-.120 3,04-4,6 2,895-3,01 73,55-76,47 2,834 72,00 3,228 82,00 P2-720 RR31-A T-720 1” 25,4
13-16 .095-.065 1,65-2,4 3,061-3,120 77,75-79,25 3,030 77,00 3,430 87,00 P2-770 RR32-A T-770 1” 25,4

Tube OD: 3-1/2 inch (88,9 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
10-16 .136-.065 1,65-3,4 3,232-3,370 82,1-85,6 3,228 82,00 3,622 92,00 P2-820 RR33-A T-820 1” 25,4

Tube OD: 3-3/4 inch (95,25 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
7-12 .180-.120 3,04-4,6 3,387-3,510 86,05-89,17 3,385 86,00 3,779 96,00 P2-860 RR34-A T-860 1” 25,4

Tube OD: 4 inch (101,6 mm)

TUBE GAUGE TUBE ID MIN. EXP. OF TOOL MAX. EXP. OF TOOL TUBE SHEET THICKNESS MANDREL SQUARE
1/2” to 4/3” (12.7 to 120mm)
[bwg] [inch] [mm] [inch] [mm] [inch] [mm] [inch] [mm] Tool No. 60mm Roll No. Mandrel No. [inch] [mm]
8-12 .165-.109 3,4-4,2 3,669-3,732 93,2-94,8 3,543 90,00 4,015 102,00 P2-900 RR34-A T-900 1” 25,4
13-16 .095-.065 1,65-2,40 3,811-3,870 96,8-98,3 3,779 96,00 4,409 108,00 P2-960 RR35-A T-960 1” 25,4

Expanders P2 are also available with 80 mm rolls. Examples of order:
P2-420 – regular expander with 60 mm rolls
P2-420/80 – expander with 80 mm rolls
P2-420/80+3” – expander with 80 mm rolls and extended length for 3”