Feasibility of GRP lining to be applied on steel ducting

[mjsamman]

Dear All,

We have steel ducting system coated internally with core-flake material and lined with modified PTFE. Due to some budgetary and time concern, we want to apply GRP lining internally to some portion of the duct.

My question is:

- The feasibility of GRP to be applied on the duct
- The temperature resistance (as I know the GRP max temp. is 100 deg. Celsius and our gas temp about 80 100 deg. Celsius) which means the margin is close.
- Mechanical rigidity of GRP
- Life span of GRP since it will be exposed to gases of [highlight #8AE234]SOx and Nox[/highlight]
- Do we have to coat the steel duct portion with same old coating (i.e Core-flake) before applying the GRP OR we can directly apply the GRP on steel duct.
- The adhesion of GRP onto the steel duct.
- How to seal the overlap between the the PTFE and GRP


Specification:
- total thickness to be applied 5 mm
- tensile elongation of the laminate 4.9% and tensile strength 12500 psi
- GRP lamination will be as per BS 4994

Regards

 

[gerhardl]

Your question is unanswered because it is difficult to answer with any certainity. Too many uncertain factors. Try in praxis if you can do this (smallscale?) as a test without any risk of loss of health and property.

 

[Artisi]

Why post it in the pump engineering forum?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)