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 | mhr/ea | |
| Fillet weld | mhr/ea | |
| Mittre weld | mhr/ea | |
| Branch weld | mhr/ea | |
| Reinforcing ring | mhr/ea | |
| Olet weld | mhr/ea | |
| Cutting pipe in case of changes | mhr/ea | |
| Pipe installation man-hours | ||
| Installation of pipe in plant (ISBL) | mhr/m | |
| Install pipe on sleepers/ in rack (OSBL) | mhr/m | |
| Installation of fittings and valves man-hours | ||
| Fitting with 1 end (flanges, lap joints, caps etc) | mhr/ea | |
| Fitting with 2 ends (elbows, reducers, mitre bends, adaptors) | mhr/ea | |
| Fitting with 3 ends (T and Y pieces) | mhr/ea | |
| Flange connection 150# , PN 10-16 | mhr/ea | |
| Flange connection 300# , PN 25-40 | mhr/ea | |
| Flange connection 600#- 900# , PN 64-160 | mhr/ea | |
| Flange connection 1500#-2500# , PN 250-320 | mhr/ea | |
| Spectacle blind, blind flange, spade | mhr/ea | |
| Bending of pipe | mhr/ea | |
| Cutting thread | mhr/ea | |
| Threaded connection | mhr/ea | |
| Installation of valve 150# , PN 10-16 | mhr/ea | |
| Installation of valve 300# , PN 25-40 | mhr/ea | |
| Installation of valve 600#- 900# , PN 64-160 | mhr/ea | |
| Installation of valve 1500#- 2500# , PN 250-320 | mhr/ea | |
| Installation of valve incl. drive | mhr/ea | |
| Pressure testing: hydrostatic/pneumatic | 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.
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