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cost relation of percentages of small piping jobs

cost relation of percentages of small piping jobs

cost relation of percentages of small piping jobs

(OP)
I´ve been asked to the cost relation of percentages of small piping jobs (~100000euros); labour vs material.
We´ve had some quotations with overall prices.
Can someone roughly tell me this.
Excuse me for my bad grammar.

Thanks in advance

Jaap

RE: cost relation of percentages of small piping jobs

Your grammar is fine.

Most small jobs are something like 40% materials and 60% labor since the labor charge is so dominated by mob/demob costs.  For jobs like that I typically figure the cost of materials and divide that by 0.4 to get the whole job estimate, then add 25% contingency.

If the material costs are hard to get (e.g., you're doing the estimate for a budget and you expect the pipe price to increase significantly between the budget approval and project start), you can go the other way--figure a per unit length price times length plus mob/demob, then divide that by 0.6.  With that I add a 35% contingency to try to damp materials price volatility.

Engineering, surveying, ROW, and permitting are really hard to estimate for small jobs, but I've found those categories to generally be less than 20% of the job, so I multiply either of the options above (including the contingency) by 20% for this soft-collar stuff.

My clients always say that they're looking for a +/-10% estimate, but they really mean they're looking for a +0 -20% estimate and this technique usually satisfies that.

David

RE: cost relation of percentages of small piping jobs

europipe:  the ratio of labour to materials for a piping job depends greatly on the material and type of fabrication.  The ratios are very different for field-run galvanized threaded pipe than for welded high alloy pipe which needs stress analysis and isometrics pulled etc.

For common materials, excluding design, zdas04's simple ratio will get you within 1/2 an order of magnitude...if painting the thing with contingency is sufficient, maybe that's close enough.  Otherwise you need to get some quotes, or engage a professional estimator.  

RE: cost relation of percentages of small piping jobs

(OP)
I think zdas helped me a lot with his valuable info.
Thanks a lot zdas a star for You
MM, My jobs are mosly piping material ss316l.
I don´t think it affects the percentages a lot.
professional estimators hmmm, I worked a long time for large companies they were highly specialized.(also cost a lot)
(estimator el, estimator pip, estimator civ,
designer pip,civil,mech,el, instr etc, etc)
Now my range of work is much wider with a small company and I´m not afraid to make a fault, but before I make that fault I try to get info everywhere.
You also thanks for your input.

RE: cost relation of percentages of small piping jobs

europipe,
The ratios I mentioned have worked well for me on welded carbon steel flow lines cross country (minimal population impact) without a major highway or river crossing.  I'm thinking that since 316 SS is both more expensive to purchase and more expensive to weld, that the ratios (plus contingencies) could very well work for you, but I just don't know.

David

RE: cost relation of percentages of small piping jobs

europipe,
What is the point of the image?

David

RE: cost relation of percentages of small piping jobs

(OP)
I´m sorry I was studying BigInch´s reply about inserting an image in a reply and in my clumsiness i pushed the button submit.
Please forget the image, I think it´s a joke

My excuses, Jaap

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