CONSTRUCTIONS FOR ZINC GALVANIZATION

Our company realizes the hot dip galvanization according to the Czech standard EN ISO 14 713

The main principles are:

• to avoid closed corners which could make air pockets and air volumes
• all double plated surfaces should be provided with air gaps and/or openings
• to avoid very narrow slots between some parts of the construction
• to install blow-out openings to locate each vent diagonally against the other one
• the construction should be provided by openings/holes and holders for making the montage of any adjacent parts
• all founded casts made by sand forms must be cleaned by a sand stream prior to their galvanization
• to avoid big metal walls formed by a thin not armored metal sheets which could be deformed during the zinc process
  

It is absolutely necessary either to avoid any use of closed rooms or to ensure a blow-out holes or drainage of closed slots, otherwise occurs a serious risk of a big explosion !

Recommended sizes of blow-out openings:

Diameter of hollow part in mm	Minimal diameter of blow-out opening in mm
< 25	8 - 10
25 - 50	12
50 - 100	16
100 - 150	20
> 150	25

It is convenient to contact management of the mentioned galvanizing factory in case of a treatment of some complicated constructions to agree on the location of blow-out openings in advance.