Pipe welding man-hours

Man-hours for estimating the erection of process or chemical plants

Wall thickness
mm
Pipe Size ASA/DIN
mm
Description Man-hour Unit
Pipe welding man-hours
Butt weld 0.000 mhr/ea
Fillet weld 0.000 mhr/ea
Mittre weld 0.000 mhr/ea
Branch weld 0.000 mhr/ea
Reinforcing ring 0.000 mhr/ea
Olet weld 0.000 mhr/ea
Cutting pipe in case of changes 0.000 mhr/ea
 
Pipe installation man-hours
Installation of pipe in plant (ISBL) 0.000 mhr/m
Install pipe on sleepers/ in rack (OSBL) 0.000 mhr/m
 
Installation of fittings and valves man-hours
Fitting with 1 end (flanges, lap joints, caps etc) 0.000 mhr/ea
Fitting with 2 ends (elbows, reducers, mitre bends, adaptors) 0.000 mhr/ea
Fitting with 3 ends (T and Y pieces) 0.000 mhr/ea
Flange connection 150# , PN 10-16 0.000 mhr/ea
Flange connection 300# , PN 25-40 0.000 mhr/ea
Flange connection 600#- 900# , PN 64-160 0.000 mhr/ea
Flange connection 1500#-2500# , PN 250-320 0.000 mhr/ea
Spectacle blind, blind flange, spade 0.000 mhr/ea
Bending of pipe 0.000 mhr/ea
Cutting thread 0.000 mhr/ea
Threaded connection 0.000 mhr/ea
Installation of valve 150# , PN 10-16 0.000 mhr/ea
Installation of valve 300# , PN 25-40 0.000 mhr/ea
Installation of valve 600#- 900# , PN 64-160 0.000 mhr/ea
Installation of valve 1500#- 2500# , PN 250-320 0.000 mhr/ea
Installation of valve incl. drive 0.000 mhr/ea
Pressure testing: hydrostatic/pneumatic 0.000 mhr/ea
Work hour units include cutting, beveling and welding.
Work hour units are for welding in-place. For weld bay, multiply standard units by 80%.
With proper and conscientious application of these construction norms and man-hours for preparing estimates, the estimator will calculate hourly time requirements i.e. the man-hours required for the erection. The man-hours (mhr) do not account for any particular condition or PRODUCTIVITY EFFICIENCY PERCENTAGES (PEP, Leistungsfähigkeit - Prozentsatz)
No allowance / costs have been allowed in the above mentioned formulas for supporting of pipe work, X-raying, cranage, pressure testing, pickling, passivation of stainless steel pipes and working at height
Alloy Man-hour Adjustments
Material Classification Groups
LABOR OPERATIONS 1 2 3 4 5 6 7 8 9
BENDS 1.25 1.25 1.25 1.25 1.25 1.25 2.75 1.75 1.25
WELDS 1.5 1.75 2.25 1.75 1.75 1.75 2.75 2.75 2.75
LOCAL STRESS RELIEF 1.25 1.25 1.25 - - - - - -
GROUP 1   GROUP 4 GROUP 8
ASTM A335-P1 .50%Moly Stainless Steels Stainless Steels - Types 317, 321, 347
ASTM A335-P2 .50-.70% Chrome Types 304, 309, 310, 316, Duplex Copper-Nickel
ASTM A335-P12 85-1.10% Chrome (including "L" & "H" Grades) Monel
ASTM A335-P11 1.05-1.45% Chrome   Inconel
ASTM A335-P3 1.50-2.00% Chrome GROUP 5 Incoloy
    Copper and Brass Alloy 20
GROUP 2     HF Modified
ASTM A335-P3b l.75-2.25% Chrome GROUP 6  
ASTM A335-P22 2.00-2.50% Chrome Low Temp Carbon Steel (see Note 5) GROUP 9
ASTMA335-P21 2.75-3.25% Chrome ASTM A333 Gr. 1 (see Note 6) Aluminium
ASTM A335-P5.b.c 4.00-6.00% Chrome ASTM A333 Gr. 4  
    ASTM A333 Gr. 9 (see Note 6)  
GROUP 3      
ASTM A335-P7 6.00-8.00% Chrome GROUP 7  
ASTM A335-P9 8.00-10.00% Chrome Hastelloy  
Ferritic Chromes 10.00-15.00% Chrome Titanium  
ASTM A333 Gr. 3 3.50% Nickel 99% Nickel  
ALLOY MATERIAL ADJUSTMENT NOTES
1. Apply the appropriate multiplier above to the corresponding Carbon Steel labor operation.
2. Adjustments shown above apply to all wall thicknesses.
3. The molybdenum content in alloys listed in Groups 1 through 3 inclusive, shall not exceed 1%.
4. Adjustments for alloys other than those listed above will have to be researched. Consult Piping lead engineer.
5. Low Temp Carbon Steel type ASTM-A333 Gr. 6 is standard Carbon Steel material and alloy adjustments do not apply.
6. Where standard Carbon Steel welding procedures and filler metal can be used, alloy adjustments will not apply to Low Temp Carbon Steel types ASTM A333 Gr. 1 and ASTM A333 Gr. 9. Consult Piping lead engineer.