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 touch-up expansion as well as a hard rolling and re-rolling a leaky tubes and for new constructions of Water Tube Boilers, Fire Tube Boilers, Economizers, Air Heaters. Expanders with 4, 5 rolls, with longer rolls or longer reach with 2 inch increments are avail- able on request.
Our K70’s right-angle rolling motors are recommended to be used with this expanders. K70 Right Angle Rolling Motor

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”