Estimating Structural &Piping Work Manhours
Fri, 2012-02-17 04:05
Hi..
I'm a fresh graduate planner..and im still learning about planning and scheduling for offshore hook-up and commissioning projects.
I would like to ask about
1. Estimating manhours for structural work such as fabricating, and installing platform deck or pipe support. What basis should I use for the estimation? Is there any books or references for referring the norm?
2. Estimating manhours for piping work such as fabricating, installing and tie-in. What reference should I use to estimate the manhours.
I appreciate to all that can give me a lessons about my humble questions. Thank you very much.
Printer-friendly version- Login or register to post comments
Send to friend
Wed, 2012-02-22 05:06
#1
Oo..thanks guy..now i got it... So what is the Spon's books norm were used for?.. I noticed that the unit they used in the table such as meter, numbers, etc.. So..what actually the norm were applicable for in the fabrication..
Sorry to ask such a silly question as this..but I really don't know about it...
Thanks for helping..
Mon, 2012-02-20 08:16
#2
Let us take your example:
Fabrication works, your reference is the Isometric drawing of 12 m pipe of 24" schedule 80 with 10 weld joint.
Can you identify what related tasks in the "Spons" book is applicable for estimating the manhours?
Also, the production rates in this book may not be applicable to your organisation productivity in the field? Do the operatives have the same skill? If not, what factor are you going to use? How about methods? Logistics? Materials? Equipment?
Suppose, there is no "Spons" book? How?
A planner with related experience can at least identify what tasks are needed for fabrication works of the pipe mentioned in your example.
As Mike has mentioned, speak to those people who are in the know.
Mon, 2012-02-20 08:14
#3
Mohd,
For piping: You must learn the so-called units: inch-dia and / or inch-meter
For structural steel: Tons and / or kilograms
It is really the experience that figure it out.
Mon, 2012-02-20 05:56
#4
Hi Mohd
Experience is essential for a planner - if you can't build it you can't plan it - otherwise you are a scheduler working on someone elses plan.
The "Spons" books are a guide only - do not take the data as being relevant to your project as there are so many variables.
As I said earlier you need to go back to the estimated cost plan and speak to your estimator.
Best regards
Mike Testro
Mon, 2012-02-20 03:23
#5
Thanks for the comments. So, that's mean, planning is all about base on experiences only?..no specific reference are applicable?
I'm not really in estimating on whole projects. I had been assigned to understand how to estimate manhours by using standard norm. One of their suggestion is by using "Spon's Fabrication Norm for Offshore Structures" book for starting points.
Let say I have an Isometric drawing of 12 m pipe of 24" schedule 80 with 10 weld joint. How do you guys really estimate the manhours of this work?
Thanks for your idea guys. Really appreciate it as im lack of the experience.
Sat, 2012-02-18 09:23
#6
i find it iirregular that a fresh graduate is tasked with estimating manhours for offshore hook up and commissioning projects. Manhour Estimation needs a degree of experience and understaning of the tasks, operations involved, manpower and equipment, crew size and durations.
The estimated manhours for structural and piping should already be available by the estimating department, or by the department who prepared the technical or commercial proposals in securing the contract. Inquire from them.
Fri, 2012-02-17 07:28
#7
Hi Mohd
Your sole source for productivity in any project has to be the BoQ or cost plan.
The estimator will have split the unit prices into Labour Plant and Materials.
You must study the Labour and Plant content to ascertain the productivity for that specific project.
Best regards
Mike Testro
Replies