Page 139 - Estimators Piping Man Hour Manual

122 Section Two-FIELD FABRICATION

PREHEATING HEAVY WALL PIPE BUTT WELDS

Carbon Steel or Alloy Materials
For Temperatures Up to 400 °F

NET MAN HOURS EACH
Nominal WALL THICKNESS IN INCHES
r*p6
IXffcCi
Size ,750 1.00 1.25 1.50 1.75 2.00 2.25 2.50
3 1.0 1.2 „ ._ „ „ ..
4 1,4 1.5 1.8 2.0 .. „ .. „
5 .. 1.9 2.1 2.4 2.5 2.8 .. „
6 ... 2.1 2.5 2.7 3.0 3.2 3.4 ..
8 3.0 3.4 3.7 3.9 4.4 4.5 4.8
10 ., - 4.1 4.4 4.7 5.4 5.8 6.3
12 .. - - 6.1 6.6 7.0 7.4 8.0
14 „ - 7.3 7.9 8.4 9.1 9.6
16 - .. ., 9.4 10.0 10.5 11.6
18 .. - .. .. .. 12.3 13.0 13.7
20 .. - - - 14.0 15.1 15.9
22 .. - .. .. ., .. 17.2
24 - -- -- -- -- -- - 18.6
2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50
10 7.1 7.6 .. .. .. „ ..
12 8.6 9.1 9.8 10.4 - „
14 10.3 10.9 11.6 12.3 • 13.0 14.0 .. „
16 12.3 13.0 13.7 14.6 15.d 16.6 - ,.
18 14,8 15.8 16.8 17.7 18.8 19.8
20 17.0 18.2 19.4 20.5 21.8 22.9 24.0 25.1
22 18.4 19.8 20.9 22.3 23.8 25.3 26.6 28.0
24 19.8 21.2 22.8 24.2 25.8 27.7 28.4 30.2
4.75 5.00 5.25 5.50 5.75 6.00
20 26.4 27.7 29.3 30.7 32.1 33.7
22 29.3 30.7 32.1 33.7 35.0 36.5
24 32.1 33.7 34.5 36.5 38.0 39.5

For General Notes, see the bottom of page 1'21.