f4-72 FRP fan - copy

   f4-72 type FRP centrifugal fan main material for polyester FRP, it has good air performance, light weight, high specific strength, corrosion resistance, not easy to aging, low noise, the use of fan Guang and other advantages, suitable for the discharge of a certain concentration of corrosive gas, can also be used as general plant and building ventilation and ventilation, the general discharge gas temperature below 50 degrees Celsius.

   High temperature FRP centrifugal fan with high temperature resistance (120 degrees Celsius) and explosion-proof FRP centrifugal fan can be selected. Safety performance: The fan in strict accordance with q/(GZ) yh1-1996 standard requirements of the various technologies, process conditions manufacturing, plastic body and metal bracket welding solid and reliable, impeller precise adjustment balance, noise and vibration greatly reduced, maintenance cycle multiplied.

Lining Processes and Application Limits

A steel lining is not a single coating. The process chain runs from grit blasting to Sa2.5, adhesive application, sheet or hot pressing, vulcanisation (autoclave or ambient), spark testing, thickness measurement, to flange turn-up and weld treatment. A failure at any step shows up later as blistering, debonding or a local perforation.

For corrosive gas below 50 C, plastic lining with PP-lined or PE-lined construction is workable; where oxidisers are present, PTFE-lined construction should be used.

Lining type	Base and lining	Typical temperature	Media and process notes
Rubber lining	Steel + natural or butyl rubber	Usually up to 80 C	Dilute acids and abrasion; sheet applied after blasting, autoclave cured
Plastic lining	Steel + PP, PE or PVDF	Commonly 60 to 120 C	Acids, alkalis and salts; hot pressed or loose lined, flanged seal
PP-lined	Carbon steel + polypropylene	Commonly up to 100 C	Acids, alkalis and salts; sheet or roll lining, double welded seams
PE-lined	Carbon steel + polyethylene	Commonly 60 to 70 C	Abrasion and low temperature; ambient solids bearing media
PTFE-lined	Carbon steel + PTFE	Commonly -180 to 260 C	Strong acids, alkalis and oxidisers; isostatic or loose lining, flanged seal
Natural rubber lining	Carbon steel + natural rubber	Commonly up to 70 C	Dilute acids and solids; bond strength checked after cure
Butyl rubber lining	Carbon steel + butyl rubber	Commonly up to 90 C	Good gas tightness and weathering; suitable for gas bearing media

Concentration, temperature, solids content and oxidising components should be written into the technical agreement. After lining, the fan is performance tested to GB/T 1236, balanced to GB/T 9239.1, and the lining is spark tested and thickness checked.