Poor Preparation of FRP Lamination Surface and Solution
Due to Poor Preparation and Lamination, our client had issues with leaks at the scrubber to inlet joint area visible in the photo to the left.
Our initial hypothesis is best explained by the simple graphic below.
Lamination Penetration Discovery Phase
Upon arrival at the site we noted signs of poor lamination which prompted
a series of grinding steps to reveal liquid penetration points.
After 2nd Grinding More Liquid is Revealed Inside Joint
Leak Penetration Point Found
Lamination over post peeled off easily with light prying due to poor surface preparation.
Leak Path After Penetration Point Found
There was no lamination of the wall to inlet directly behind the post. The post installation technique should have been:
- Laminate to seal off inlet to scrubber wall joint (putty & laminate) – only putty was used.
- Place post and put a laminate over the post.
FRP Lining Repairs Made
- Cut post ~6″ from bottom.
- Surface preparation to obtain good adhesion.
- Seal off inlet to wall joint (at bottom of inlet)
- Laminate joint from inlet to scrubber
- Bottom horizontal joint.
- Minimum 4′ on the vertical joint.
- Install Post – Post to scrubber wall connection at inlet
* Due to the leaks, a conservative approach was used in
designing the repair patches. Posts, made of pultruded
FRP, which is harder to adhere to, at least 4′ along the
post height was grinded.