Pipe joint duration

Since, it is 40-inch diameter pipe, so it will take approx. 2 hours, if you are an experienced TIG welder.

PP Admin,

Thanks for the posts above,i.e., #1 to 21. I have gained knowledge about pipe - laying job and had given me great confidence facing a new scheduling work. It is reallly with great thanks considering the difference it made if this is not available. Have downloaded it in Word so I can read some other time and for reference.

 Reynaldo

Estimator’s Piping Man-Hour Manual also available at:

http://www.gulfpub.com/default.asp?page=14&productID=2708&VS=



Might be of interest:

Cost Estimating Manual for Pipelines and Marine Structures

http://www.gulfpub.com/default.asp?Page=14&productid=2707&searchtype=2&…

You may please refer to this great book:



Estimator’s Piping Man-Hour Manual, (Estimator’s Man-Hour Library) - By John S. Page



This is the Bible for piping works.



Must have... Available on amazon



:-)

Dear Safak,



refering to your post below, could u please send a copy to me? surely it will help me a lot. if not, could u give the link so that i can buy it from net?



regards,

Saiful

saiful@knpe.com.my

Dear Asadullah,



Rigging Plan

You will need to start thinking about Maximum load per piece, dimensions, Cranes available, load charts, safety plan, lifting devices.



I would suggest that you search the net and at the same time ask the experienced team members that you have.



Best Regards,



Samer

Dear Asadullah,



PIPELINE Rule of Thumbs is a very good book to look. I have not got a electronical copy, but you can buy it from net.



Best regards,



Safak

Dear Asadullah,



You should only open one thread.Dia inchs or meters will depend on the CLIENT. My choice will be dia inches, but if CLIENT has a rates depending on pipe length they will want it. For pipelines m will be used for sure. But dia-inch is a important factor. Do not forget you can load both to as a resource.



If you are looking for basic pronciples. I can tell you a few things. 1st of all, the piping works critical activity is welding. Dia inch will give you m of weld you will need to complete for the work. After deciding how much welder hours for a m of weld requires (changes due to SCH, Material Type, position...), you can decide how many welders you will have (CM, PM or piping eng decides) and you will find your minimum duration.



After that you can ask for the crews, how many helpers, S/Bs, cranes, riggers etc. for the work. After you complete your crew the total manhour will be the personnel*workinh hours in a day*duration.



Other effect will be the inspection (especially radiography) How many joints you can inspect in a day. What is the percentage of joint inspections needed (Quality Plan)? ...... Basicly radiography will be based on "Source" not crew.



You can ask for the painting, hydrotest, painting touchups, insulations, commissioning...... (earthing vs.) to your piping engineers.



Please feel free to ask & talk with your site engineers and CM. They will do the work and you need to reflect what is going to be done to the plan.



Regards,



Safak

Sorry, I cannot arrange the looks as in the WORD.



About quality plan, your project should have one as a procedure or in CONTRACT or TENDER Documents. And it will be project oriented. Other projects QPs will not help you. My suggestion is go to your welding engineer and ask them.



It is normal to learn how the works are going.For all disciplines my suggestion is go and ask your engineers or construction manager. If you cannot create a detailed production plan as this just ask them with how many personnel and in how much duration they gonna finish.



I can assure you using manhour schedules is a quick and easy way to resource load your programs but then you will suffer from it.



Best Regards,



Safak

Dear Asadullah,



This example will help you to understand the way to create a production planning for activity types I think.



I assume it is a pipeline or at least a long run on a plant.



You can assume one joint can cost you 15 MHr only for joint. The important think is that you need to do double or triple joints and weld them after completing parts. Or you can go steadily by line.



If you are going to go by the line, You can have 3 teams of 2 welders (can be 4 but there are technical and HSE impact). Lets say you have 9 passes.



First 2 Passes      Base

3rd Passes      Medium 1

4th -6th Passes          Medium 2

7th 9th Passes          Cap

(This can change due to welding type)



Let’s have 3 teams



1st team continuously welding Base & Medium 1

2nd team continuously welding Medium 2

3rd team continuously welding Cap



So Daily Production will be



                 Day 1               Day 2            Day 3

Base & Medium 1  3 joints      3 joints 3 joints

Medium 2             2 joints 3 joints 3 joints Cap                      1 joints 3 joints 3 joints

Joints For Insp.     1               3               3           …….



For Inspection You can have 3 Shots Per night with 4 person team (Radiography).



Duration For Welding= ((No. of Joints -1)/3)+1                         (A)

Duration For Inspection= (A) + 1                                    (B)



MHr for Welding = (A) * 3(Crew)*(2(Welder)+2(Helper))*8(Hours)           (C)

MHr for Inspection=(B)*4(Crew Size)*12(Hours)                          (D)



Total Manhours = ( (C) + (D) ) * (1.1) (10 % Contingency for Repairs)           (E)

Manhours per Joint = (E) / (No. of Joints)



* You can add 10% contingency as a duration but CLIENT will refuse it, because they want you to mitigate the repairs as extra crews (overtime will not be available due to inspection constraints) not in extra durations.





You should talk to your welding engineer or welding foreman for details. Then you can create a production analyses for the details. If welder tests of other stuff are reported as direct manhours and reimbursed you can add to cumulative manhours to include that kind of calculations with in. I have a Schedule for pipe fabrication &erection but my actual field reports are so much different from them.



So this kind of studies could seem to be time consuming but it is essential in plan. And this is the healtiest way to find manpower-manhours and time consumption of the activity types.



Best regards,



Safak

Dear Asadullah,



The length of the weld = 2x 22/7 x 20" = 125" = 3.2m

Thickness = about 1" = 25mm



Manual welding would be very long. With 4mm rod you are talking about 8-10 passes to fill the thickness. And that is 30m of weld per pipe. Since this is a pipe, you will need a 6g (all positions) welder. Maybe he can finish it in 15 hours. The problem here is the quality and the testing. Do you have an inspection and test plan.



This is a large pipe and I would recommend that you ask for automatic welding machine. Or at least a MIG welding manual 1.6mm thickness or larger wire spool. The rate of deposit is much higher.



If you are welding a pipeline, then you need to get 3-4 automatic machines. They can run for 25000$/each. Using a mobile crane and a small crew, you can be very productive.



Best Regards,



Samer

Dear Asadullah,



The processes can be:



TIG/ MIG/ ARC, etc



Applied:

Manual, Semi Automatic, Automatic.



With kind regards,



Samer

Dear Friend,



You need to tell us the thickness of the pipe and the process that you will be using.



With kind regards,



Samer

Dear Asadullah,



It depends on the type of material and the pipe thickness and the method of welding (Tig, Mig, electord) and the process (manual/ automatic/ semi-automatic).



I would suggest that you check with the contractor to determine the method, and confirm the best timing with the major welding machines suppliers like; Miller, Lincoln, Esab and others.



Best Regards,



Samer