Plant installation 1

[gravitate]

If the client is doing the design of the plant and equipment who should state where the field welds will be done and any modifications of the equipt for installation? The Client or installation contractor?

 

[BigInch]

The client ... obviously.
But from the quality of design work I see these days, I could certainly understand why a contractor might have a different opinion. I often do.

Independent events are seldomly independent.

 

[Latexman]

"The client is doing the design of the plant and equipment" doesn't give me a warm, fuzzy feeling. Who did the detailed (not conceptual) plant/equipment layout? Who did the piping design? Who did the stress analysis?

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529

 

[MJCronin]

I am also confused....

Field welds locations of piping systems USUALLY (but not always)are determined by the reasonable spool size necessary for transportation to the field site.

In my experience, spool transportation limitations indirectly determines about 60 to 80% of filed weld locations.

Add on another 15-20% of field welds that are determined by last minute changes and field routed piping.

For new or replacement piping systems that are to be installed into an existing, congested plant...... the percentage of field welding could be 80-100%.

Sill confused by the OP's phrase :"any modifications of the equipt for installation"..... What exactly is meant here ?

 

[Latexman]

Utimately, BI is right, the client has to sign off on the work, but I wonder in this case who did the detailed piping work. THATs who has the knowledge to really make the calls.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529

 

[gravitate]

Ok thanks for the answers. I remember on the isometrics from the final design usually have the welds on ( this is how in our last job we started a weld register). But if the isometrics come from the final design/ model then does the installation contractor have any say in where these welds are?

Is final design done usually before the installation contractor is found?

 

[BigInch]

I wasn't thinking so much of equipment fabricated offsite and transported in, in which case I would tend to agree with MJCronin. If it was for work to be fabricated on site, I'd say definately the client would be in a good position to decide, although he should be prepared to pay for the wrong decision. In any case it is not a matter of who has more authority over the other, but the best way to do it. That should be agreeable without resorting to the "It's my football" thread. If the contractor really doesn't agree with the ultimate decisiion, then his recourse would be to state his intent to claim for extra payment, justified by determing a cost for each option of field joint locations being considered and writing up a change order for the difference.

Independent events are seldomly independent.