Fasteners - hdgasa
Fasteners - hdgasa
Fasteners - hdgasa
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General<br />
maintenance periods would be needed.<br />
Initial period of 10 years followed by<br />
maintenance in years 10 and 20.<br />
Using hot dip galvanized fence in an<br />
equivalent environment the service life is<br />
maintenance free.<br />
Hand painting a fence is time consuming<br />
and costly.<br />
A painted fence showing signs of premature<br />
corrosion at the interfaces.<br />
This however does not provide any life<br />
cycle costs.<br />
Assuming a required service life of the<br />
sample fence is to be 30 years.<br />
Service life estimates<br />
In order for the painted fence to conform<br />
to this requirement, a minimum of two<br />
Cost of maintenance<br />
Employing a team of 4 painters at a cost of<br />
R150/day working at a rate of 20m²/day our<br />
1 000m² fence would involve a current (no<br />
escalation) cost of R30 000 per maintenance<br />
period. The increase to our painting<br />
contract increases by a conservative<br />
current cost of R60 000 in order to meet<br />
the 30 year service life specified.<br />
30 years costs (no escalation)<br />
Painted fence cost R150 000 “initial” plus<br />
R60 000 “2 x maintenance periods” to a<br />
total of R210 000 or R210/m².<br />
The maintenance free service life fence is<br />
R150 000 or R150/m²<br />
Bob Wilmot<br />
A no maintenance hot dip galvanized palisade<br />
fence will work in the majority of the<br />
environments in SA.<br />
A costing comparison of this paint<br />
specification to that of the hot dip<br />
galvanized fence, comprising a<br />
metallurgically bonded zinc and/or zinc<br />
iron alloy layered protective coating of<br />
60 to 70µm, we could expect the<br />
following estimates.<br />
Assumed fence dimensions with costs<br />
Assuming a fence comprising 25 tons of<br />
steel with a surface area of 40m² per ton,<br />
we would have a total surface area of<br />
1 000m² to be painted. Using estimates,<br />
from our paint friends of the suggested<br />
paint specification, cost per square metre,<br />
would be approximately R150 per m². The<br />
initial cost to paint 1 000m² would be<br />
R150 000.<br />
The current estimated hot dip<br />
galvanizing price is in the order of R5/m²<br />
(R5 000/ton), giving an initial cost of<br />
R125 000. R6/m² would equate to that of<br />
the paint alternative.<br />
Volume 10 Issue 2 2013 Hot Dip Galvanizing Today 39
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