Fasteners - hdgasa

Thermal metal sprayinginspections. In addition, frequent checkswere also carried out by a member of theRobor management team who alsochecked on the safety compliance issues.Final inspectionThe appearance of the finished zinc metal sprayed coating.The final inspection was carried outusing the requirements as set out inthe SANS/ISO 1461 standard. A total offour reference areas, as opposed to therequired three, were selected along thelength of each girder. Five coatingthickness readings were taken in eachreference area. The results were used tocalculate the local and mean coatingthicknesses. The results are shown intable 1.time which resulted in the frequent useof heavy transport vehicles between theblasting and spray areas. This wasnecessary to avoid flash rusting of thefreshly blasted areas. The spray processwas carried out under cover but in a wellventilated area.Once the one side was completed, thegirder would be turned over andtransported back to blasting area wherethe whole process would be repeated.In-process quality checksIt quickly became evident that frequentquality checks were needed to identifyareas which required additional layers ofmetal spray. The operators from Roborwere issued with calibrated thicknessgauges which they used for their ownIn SummaryThe project was successfully completedtaking into account the dimension of theproducts and the logistical issues . Thefinished products were accepted by allparties and it was generally accepted thatthis project, being a first of its kind, washandled professionally by all involved.The Association wishes to thank Nico Schoemanof Robor Galvanizers for this article.Part no. 101 530 02Individual readings Area 1 Area 2 Area 3 Area 4 Mean coating thickness1 339 238 137 1292 260 279 140 1773 273 222 153 2014 275 269 131 1545 378 230 137 178Local mean coating 305 247.6 139.6 167.8 215Part no. 101 530 02 CCCIndividual readings Area 1 Area 2 Area 3 Area 4 Mean coating thickness1 256 191 298 1872 257 193 236 2253 236 251 184 2574 242 250 180 2295 234 270 134 243Local mean coating 245 231 206.4 228.2 227.65Part no. 101 530 01Individual readings Area 1 Area 2 Area 3 Area 4 Mean coating thickness1 205 318 343 2402 252 265 260 2903 227 317 231 3534 242 339 264 3155 265 287 365 266Local mean coating 238.2 305.2 292.6 292.8 282.2Table 1.MRHnew paintingfacilityMRH (Affliate member of HDGASA)operates two fully-fledged blastingand painting facilities in Philippi,Cape Town. The new facility boastsone of the largest blast booths inSouth Africa.These two facilities provide acombined area of 10 000m 2 with4 000m 2 of under-cover area and therest being “lay-down” space.The MRH facilities also cater for theoff-loading and collection of steel bylarge horse-and-trailer trucks.The marine office is located alongsideSturrock Dry Dock in Alkmaar Road inthe Port of Cape Town.MRH is a Level 1 BBEEE company.34 Hot Dip Galvanizing Today Volume 8 Issue 1 2011