Page 6 - Industrial Process Plant Construction Estimating and Man Hour Analysis

xx Preface

equipment are given. Engineering, contractors, and owners are concerned with
statistical applications to industrial process plants and this section is provided.
The book develops the principals in a systematic way, and the book is divided
into 12 chapters. The first chapter is an introduction to construction statistics
using Excel templates and mathematical spreadsheets. The purpose of this chap-
ter is to provide a basic understanding of how to use Excel templates and spread-
sheets specific to construction. These Excel templates and spreadsheets are used
to provide a step-by-step guide for how to set up and perform a wide variety of
statistical applications to industrial process plants. Chapter 2 provides the reader
the man-hour schedules and tables for the installation of process piping in indus-
trial process plants. Chapters 3–10 provide detailed scopes of work for each sec-
tion and man-hour tables based on historical data collected from field erection
of equipment installed in industrial process plants. Estimate sheets that itemize
the equipment scope of work are set up on a computer, and historical man-hours,
using the unit quantity model, calculate the direct craft man-hours. Installation
man-hours are summarized, and historical man-hours are compared with esti-
mated man-hours. Chapters 11 and 12 provide sample estimates and illustra-
tions of statistical applications to industrial process plants. The direct craft
man-hours have been verified by statistical analysis and were determined from
time and measurement of craft labor for field erection of process piping, equip-
ment, and boilers installed in process plants throughout the country. The sec-
tions’ work scope, man-hour tables, and estimate sheets are applicable for all
contractors, engineering firms, and process plants that install process piping,
equipment, and boilers in industrial process plants. The statistical and estimat-
ing methods in this book will enable estimators and engineers to prepare com-
prehensive and detailed direct craft man-hour estimates, RFPs, and field change
orders for the following industrial process plants: diesel, solar, and coal-fired
power plants; industrial package boilers; pulp and paper plants; oil refinery;
and boiler tube replacement.
Construction experience and education may vary, and we believe that the
book is suitable for those working in engineering and construction. The book
has been written to appeal to engineering/technology/construction estimating
and management settings. The book will decrease the chance of error and allow
estimators to accurately determine the actual direct craft man-hours for the
complete installation of process piping, equipment, and boilers. The estimating
methods in this book will enable the estimator to use the comparison method to
estimate the differences between proposed and previously installed equipment
and boilers, and the unit quantity method will be a final check on the estimated
man-hours compared with the historical man-hours. The book does not include
man-hours and cost for material, equipment usage, indirect craft, supervision,
project staff, warehousing, and storage. The direct craft man-hour estimate is
the basis for the estimator to obtain the project schedule and the cost for mobi-
lization and demobilization, indirect craft, supervision, project staff, construc-
tion equipment, subcontractors, material, site general conditions, and overhead