Page 243 - Industrial Process Plant Construction Estimating and Man Hour Analysis

Chapter 11

Sample estimates

11.1 Section introduction

This section provides the industrial process plant construction estimating
process to enable the reader to use the statistical and estimating methods,
scopes of work, man-hour tables, and estimate sheets to

(1) evaluate the accuracy and verify historical data collected in the field for
process piping and equipment installed in industrial process plants;
(2) provide a comprehensive and accurate method, using construction statis-
tics, and estimating methods to compile detailed estimates, RFPs, and field
change orders.
The section enables the reader to use sample estimating forms for piping and
equipment to set up detailed estimates on a desktop computer.
Equipment estimates illustrate the steps required to calculate the
detailed craft man-hour estimate. Examples will illustrate how the unit quantity
model, data, and tables that are summed in the computer model the erection
sequence.
The sample estimate does not include cost and man-hours for material,
equipment usage, indirect craft and supervision, project staff, warehousing
and storage, shop fabrication, overheads, and fee. The direct craft man-hour
estimate is the basis for the estimator to obtain the project schedule and the
man-hours and cost for indirect craft and supervision, project staff, construction
equipment, material, subcontractors, mobilization and demobilization, site gen-
eral conditions, overhead, and fee. In addition, the estimator must determine all
factors that will affect direct craft labor productivity and overtime impacts.
The estimator can use the table of labor factors and values for factoring labor
productivity in the introduction.

Industrial Process Plant Construction Estimating and Man-Hour Analysis.
https://doi.org/10.1016/B978-0-12-818648-0.00011-9
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