Are MTO's the same as BOM's? Let's take a look!
First
off, let's define them individually and then take a look at when and how they
are used.
BOM, or Bill
of Materials, is more detailed than the MTO in
that it lists a detailed description of each material in the project
including the type, grade, wall thickness, end treatment, specification,
quantity, unit of measure, unit cost, and may include labour cost per unit as
well. Every pertinent detail is listed in order to specify the exact
component to be ordered.
An
MTO compares to a BOM similarly to how a PFD compares to a P&ID.
The differences are the amount of detail involved and the stage of
development in the project. Generally an MTO is generated early in the
project from a 10% to 30% model and used for bulk cost estimating. A BOM
on the other hand, occurs later in the project at 90% model completion (with
exceptions for long lead time components) and aids in the procurement process.
In
case you haven't already guessed, both the MTO and the BOM are generated in
Microsoft Excel. If you are creating them automatically from a 3D model
in AutoCAD/CADWorx or similar software, there is a built in tool for extracting
BOM info into a .csv or .xls format which can be imported or opened in Excel.
If
you are a Piping Designer, and haven't been asked to create an MTO or a BOM,
then you'll find this short article useful. You will be asked to make one
or both of these at some point.
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