Piping Erection Rate

Suggest you have a look at www.costeng.com. They have Estmating software that automatically accesses manhour data for all fabrication and or installation activities for pipework. 

Hi Daya,



Thanks, but this is our daily bread so to speak, we get paid to think, and thinking is about asking questions about what you don’t know rather than what you know. To a lot of people thinking means dreaming about something nice.

Regards



Philip

you are great Philip, giving answers by questions

Where is the guy working?

What is the specs?

What is the material?

What is the schedule of pipe?

Is heat treatment required?

Is HAZOPS a question?

What is the NDE requiorements?

Kow many Questions are there?

Think it through/

As the original poster referred to pipeSPOOLS I take it that he excludes transportation piping or refinery piping which is located on sleepers or on a piperack.

Assuming he is installing piping in a process plant environment then I can only suggest to use the piping isometrics and estimate the work on each individual isometric, based on total length of pipe shown, number of welds, number of flange connections, number of valves to install etc.

For his given 42" STD. CS pipe I would use 6 hr/per meter pipe, 7 hr/per fitting (elbow etc.), 21 hr/per weld and 7 hr/per flangeconnection.

It is obvious that complexity of the piping (= ratio of number of welds per total length of pipe) is too divers to use an all-in manhour rate per meter.

Hello Sukumar,



I think you can refer Estimator’s Piping Man-hours manual by John S. Page that will cover those items in detail.



HTH



Daya

I beg to differ on this issue.

Refinery/Petrochem Projects are demanding & much more complicated than building works.

Piping works are not so simple as Civil/Structural or building works.

Study & decipher Piping GAD’s & ISO’s, Piping materials are huge & diverse unlike Civil/structural materials.

Fabrication & erection have different rates,

Site fabrication, Shop fabrication, Pre-fabricated spools are have different welding rates which also depends on the Material of Construction (MOC) & ofcourse craftsmanship.

SAme is with Piping erection, since this involves work at site, its productivity is low compared to fabrication.

Factors affecting erection rate are MOC, Height of erection, Erection of Pipe Rack or around Equipments & others.

Piping work does not end here.

In fact, it will serve all if the various productivity rates are displayed (country-wise, job-wise etc), but will planners share such vital information?????

Jaco,



About the book. What is the name? Who is the author? Appreciate your info.



Regards.

It is nice to so such an old Post came alive.



Well for me the easy method is to do an estimate.



Below Major Pointers for doing an estimate. (The Easy way is to take it from a book)



First we have a look at the Delivery. = HOW WILL THE PIPE GET THERE. Once we know this we can estimate an delivery estimate.



Then we have a look at Fitup = What type of pipe is it is. Is it Seamed / Seamless / Finwall / Thik Wall / Rolled / Spiral/ preped / macine prep. All This can effect the the time for the Fitup



Then we have a look at the Weld it self. I would suggest only work with Arc Time then Add Reel / Rod Changes / Setup etc. (The Reason with different method of Welding Example Stick / Mig etc) Will have differnet time Then you add Effeciency / Job Difuiculty Factors / QA / Material Type / etc.



Now you should have a good time for a weld.

In piping fabrication the productivity rate is calculate based on dia inch ie. How many dia inch of weld per hour? Usually 22~25 dia inch.



Regards.

What should be the measure of Piping Fabrication ? The concept of inch dia ignores the thickness. The concept of tonnage ignores the no. of joints.



In my opinion, the best (but cumbersome) is the volume of weld deposit that will give the most accurate information on the work content involved.



Any suggestions?

Try also 3.752 Manhours per dia inch. this includes hanndling , fabrication, to final acceptance.

To calculate average number of welds by hour for pipe sizes over 30", you can use the following thumb rule:



N = 100/Pi*D,

where

D = Pipe Diameter,

Pi = 22/7 =3.14

D = 42 in your case

supplying all above info into the above thumb rule equation, you will get



N = 0.758 nos per hour, if it is 10hrs of working, 7.58 ~ 7 welds per day.



hopefully the above can help u to some extent.



Regards

Daya

Hi Mahmoud, welcome to the Planning Planet.



There are variables that will affect the estimates (metalurgy, diameter, thickness, #welds, etc.). We have a system that can assist you with preparing estimates, plans and schedules for piping erection, but it is not free (see link below).



Bernard Ertl

InterPlan Systems - eTaskMaker Project Planning Software