Cost Methods

The Cost Methods settings are used to determine the calculation of item rates. The settings are accessed by clicking the Database Costing Cost Methods option.

Tip: In addition to the information in this topic, review the Costing Fundamental Training video for more information on how to cost a job in Fabrication ESTmep.

Normalisation

With the Use Normalised Straight Costs option enabled, entering a value here should be the value that you require the calculation to be based upon.

For example, 3.00 meters entered here would accommodate for most ancillary spacing, using multiple frames across the 3.00 length (4 if 1500 standard straights), supports, stiffeners etc. Therefore, when divided to result in the per meter cost, the rate per meter will contain a percentage of these ancillaries, along with material, fabrication and installation averages. This produces a standard cost per/m throughout the job.

To determine how to best configure your normalisation of straights when using flanges (CGF, TDF,TDC), as this requires additional material, it is generally recommended to use 2 or 3 times your finished length to be specified in these fields.

The following is a guide on how to configure connectors and straights to produce the desired dimensions and costing values for your projects.

STD Straight option in the Specification

This is the complete length, including connector allowances, which is also known as the development length or coil width. Finished length will be a factor of the 'STD Straight Length' with the final length being adjusted for the connector type in use.

Note: All Straight items wanting to use this method should be set to "Auto" for the Length dimension.

For example, a 1500 auto length entered, which has a sheet metal flange applied of 25mm to each end, the display object will show 1450mm as the finished length.

Within Job contents or Quick Takeoff view, using the Qty/Length field as the display will report the length minus the connector allowance applied.

For example: Setting up the costing of this must be using the following method:

The Normalised length from within Costing Database = this is usually double the finished straight length. If we use the above again as the example data, the length to input here would be 1.45m, 2.9m, 4.35m. There is also the consideration of support and stiffener spacing, as Normalised lengths above the active spec spacing would provide a more accurate cost per meter, as these include support/stiffener ancillaries.

For example, spacing for each of these at 3m (within the Specification table) would not be taken into consideration for the 1.45m and the 2.9m finished lengths. Only the 4.35m length (x3 of the finished length) would incorporate the cost for supports and stiffeners effectively.

Note: Putting in the standard straight length here when using additional material for turnover would result in multiple developments and multiple connectors being generated for each item. This is why it is recommended to always remove the possibility of connector allowances when entering in this figure. 1450mm below would be the finished length required and multiple of this number should therefore be entered. (1.45m, 2.9m or 4.35m etc).

The diagram below is an example of what could happen if the normalisation field does not have a sufficient value which is not a multiple of the finished length. This would cause additional material and additional connectors would then be assigned generating excessive cost.

For best results, we strongly recommend testing a number of scenarios until happy with the costs being generated.

Note: The Estimating software is an averaging system. Therefore quantities and values being reported after using normalisation are averaged calculations.

Extra Over

Extra Over is an alternative estimating method and is mainly used for speed rather than accuracy, and is mostly used by estimators who have a single line drawing or estimators using a digitizer. When using extra over the user would measure the straight duct 'through' the fittings to its center point, and then adds the fittings later. This will obviously give them too much straight duct. This is counteracted when the fitting is added. The centerline length of fitting is calculated, and then the software then calculates the cost of the equivalent length of straight duct, and then subtracts it from the cost of the fitting. This method of entry can be turned on or off from the Takeoff menu in Quick Takeoff. The Extra Over entry method is designed to be enabled or disabled at the start of each quotation only. It is not recommended to switch between the two methods.

Note: This option is intended for use by estimators using a digitizer for quantity takeoff.