6.12. PROTECTIVE COVER


Painting (Including sand blasting) & insulation.

6.12.A. Painting

6.12.A.1. A generic 'EMMA' for any work with bulk quantities.

A multi-purpose EMMA can be used for any 'bulk' activity, involving a physically measurable unit of construction work scope that is quantified in tens, hundreds or thousands and painting is a typical example, being normally measured in square feet or metres.

 

The EMMA comprises 3 'pages', namely 'INPUT' (Basic data that must be inputted in order for the EMMA to function), 'TABLES' (Spreadsheets for inputting target & actual progress percentages, manhours etc), and 'CHARTS' (Where inputted spreadsheets are presented as S-curves & histograms). The EMMA can be used:

  • to set up a target rate of progress (S-curve);
  • to set an estimate of man-hours, converted to manpower requirements (histogram);
  • to record units measured as complete each month;
  • to record man-hours consumed each month, thereby automatically comparing the actual rate of progress and actual usage of manpower, with planned rates.
  • furthermore, unsatisfactory trends can thereby be identified and work re-scheduled, along with automatic revisions to manpower requirements, that will lead achievement of target completion.

Initial requirements for inputting are:

  • the estimated total quantity;
  • definition of the unit (eg m3);
  • an estimate of man-hours required per unit;
  • the average number of hours to be worked each day;
  • the average number of days to be worked each week.

Thereafter, inputting should be in accordance with notes provided.

Use of an EMMA will be of particular interest to anyone with responsibility for getting a work scope package completed on or ahead of schedule.

 


6.12.A.2. Painting - an alternative approach including material.

Painting of a newly built industrial plant tends to be the forgotten discipline, being required towards the end of the construction schedule when attention is being concentrated on achieving mechanical completion*. Consequently, the painting workscope is often seriously underestimated, particularly for piping, where hydrotesting has to be completed before paint can be applied. The following calculator can be used to gain a rough estimate of manhours involved and the cost thereof, together with an indication of paint quantities and cost. A manhour application rate is used as an option, but user can change to a higher or lower rate if a more accurate information specific to his/her particular project is available.

Having calculated the manhours, user can proceed to the next sheet and, having inserted a figure for the site's monthly working hours, automatically create an S-curve to meet the construction schedule, together with a labour histogram. When work gets underway, actual progress (physical measurement as a percentage) can be plotted, plus actual equivalent manmonth numbers derived from manhour allocation records. 

Paint specs and application procedures can cover a wide spectrum and this calculator, therefore, only applies to basics.  However, as an early planning tool, it can be very useful and will always serve a purpose, being better than having no estimate at all.

Note;*Painting is nonetheless part of MC.


6.12.A.3. Sandblasting - Manhours for equipment & piping

Given dimensions of equipment items such as vessels, heat exchangers, towers etc  and/or lengths and sizes of piping to be sandblasted in preparation for painting, this calculator can be used to estimate manhours required. Typical manhour rates are provided, but user can change these to suit local conditions if necessary. A hypothetical example can be seen by clicking Real-time Sync at foot of table, by inserting secret key 'sandblast', then click Connect.