What is "pipe trim" 2

[JoeChem]

Greetings,

I am doing some conceptual estimating for a small chemical batch plant. I am relying on a reference Planning, Estimating and Control of Chemical Construction Projects for much of the estimating data. In the Piping Estimating section the authors offer a table of basic piping unit costs vs material and size for the following line items:

Pipe, per ft
Fittings, each
Flanges, each
Trim, each

I am unfamiliar with the term "trim". What is piping trim?

Thanks in advance,

JoeChem

 

[BigInch]

I'll take a guess that its gaskets, bolts, nuts, welding rods, hangers, shoes etc. What % do they have?

"If stupidity got us into this mess, then why can't it get us out?" - Will Rogers (1879-1935) ***************

http://virtualpipeline.spaces.live.com/

 

[pennpiper]

Check the back of the book and see if there is a "Glossary." Most every technical book has one.

 

[zuccus]

Don't forget about the trim on your equipment also, this seems to be something that is always missed by the estimators.

i.e. drain and vent lines, psv's, etc.

Zuccus

 

[MortenA]

I would guess the same as zuccus: Its e.g. bridles (e.g. standpipes), drains etc. attached to vessels.

Best regards

Morten

 

[JoeChem]

Thanks for the responses.

The book does have a Glossary of terms but "trim" is not included.

The data in the Table are in unit costs. As an example for 1 inch 316 SS pipe:

Pipe, per ft $7.70
Fittings, each $15.70
Flanges, each $41.00
Trim, each $250.00

The costs need to be adjusted for inflation as a CE cost index of 420 is referenced.

I have asked all over the place and no one understands the meaning of trim as it applies to piping. I suspect all your replies are correct but I am just not sure.

I am going through some of the piping cost details at this point in the estimating exercise as I am really trying to understand the rough cost differences between SS pipe and SS tubing (compression fittings). Hence the reason for trying to understand "trim" and what this is exactly. The project could use either pipe or tubes. Right know it look like the difference might be a wash as the compression fittings are much more expensive but this is balanced out by less engineering and field installation labor. Do any of you have any experience with the piping/tubing cost difference?

Thanks,

JoeChem

 

[eliebl]

In the context we use Trim it would refer to the bridles, PT's, TT's, and other items connected to vessels. As you create isos for piping you also create an iso for each trim component.

Piping cost caries a large component of design. If you simply specify field run tubing, nothing needs to be designed or prefabricated to tolerances and hope that it fits when the part gets to the field to be installed.

EJL

 

[zuccus]

If you have the choice between ss tubing and ss piping, I would take tubing all the time. Heck I have chosen ss tubing over carbon steel pipe before.

Time saved adds up very quickly.

The trim reference for the piping could also mean things like insulation requirements, heat tracing,pipe shoes, anchors, pipe hangers, other special supports, so don't forget about those.

 

[786392]

Dear JoeChem hello, Although many of learned colleagues have guided you.
1)I suggest you to check with the supplier/vendor if the reference is correct; not a typo error.
2) By "Trim" It may bear the indication of special sizes or cuttings or "bunch of some packaged offerring"
Hope this helps.

Best Regards
Qalander(Chem)

 

[chief]

In the Uk, trim would mean all the externals related to a pipe system routing ie. gaskets,nuts and bolts , washers, pipe supports,insulation,paint,earthing straps etc.

Offshore Engineering&Design

 

[BigInch]

chief, did you copy my answer?

"If stupidity got us into this mess, then why can't it get us out?" - Will Rogers (1879-1935) ***************

http://virtualpipeline.spaces.live.com/

 

[chief]

Big inch,
Just giving a trans-atlantic confirmation of your answer.European and American technical terms do not always agree.No plagiarism intended and apologies proffered.

Offshore Engineering&Design

 

[MortenA]

come to think about it - what i thought about is vessel trim.

Best egards

Morten

 

[BigInch]

Chief. Just thought I'd wind you up today.

"If stupidity got us into this mess, then why can't it get us out?" - Will Rogers (1879-1935) ***************

http://virtualpipeline.spaces.live.com/