10
• Silicates and Oxides—Silica scale is virtually impossible to remove. Silica
scale is unlikely if SiO
2
is held below 150 ppm. Oxides, such as iron oxide,
can coat all parts of the system if soluble iron is present in concentrations
above 0.5 ppm. Iron oxides do not usually develop into thick scales but can
accentuate the development of other scales.
Do not walk directly on the fill. Place appropriate walking surface
on fill to avoid crushing. Recommended walking surface would be a
minimum of 15mm thick plywood measuring at least 30cm x 60cm.
Spare Parts
SPX Cooling Technologies manufactures and inventories cooling tower re-
placement parts. Typical lead time is 10 working days. Contact your Marley
representative for emergency service.
Owners should consider maintaining inventory of critical mechanical compo-
nents, such as a fan assembly and gear motor to avoid emergency shutdown
of cooling tower operations.
Be sure to furnish the tower serial number when ordering parts.
Caution
maintenance
