Problem Solving Forum
February 13 - February 19, 2019
Your field surface preparation requires SSPC SP-10 and your field bolting uses hot-dip galvanized bolts. What surface preparation do you require/allow on and around the bolts?
Jonathan Rausch of That's private on
February 25, 2019:
Make sure the steel is primed before assembly, the ...read more Make sure the steel is primed before assembly, then topcoat after final assembly. With the nuts and bolts being galvanized and painted, that should give you a decent life span in my opinion.
Mike Beitzel of Modjeski and Masters on
February 13, 2019:
It is assumed a zinc primer is to be used and shou ...read more It is assumed a zinc primer is to be used and should be applied to bolts and field around the bolts. Solvent clean to remove lubricant from bolts and any oil or other residue from bolting operations. If the field around the bolts has been blast-cleaned and primed, a zinc phosphate treatment solution could be used on the galvanized bolts or comply with ASTM 6386, which allows for sweep blasting or surface sanding or power tool cleaning such as bristle blasting. If the field around the bolts is unprimed, it should be blast-cleaned prior to bolt installation, which would be followed by the above cleaning of the bolts. If the field is unblasted prior to bolt installation, solvent clean bolts and field and blast to SSPC-SP 10, avoiding direct blasting of bolts and prime bolts and field.