Section 5: Maintenance and Repair
Repairs
2019 BATT Diesel/Jet Fuel Operations Manual
(Version K)
16
We Engineer Solutions
Permanent Repair (Outer Bladder Only)
For outer tank minor permanent repairs, use the BATT patching kit (not attached to the tank). Small local
damages on the outer bladder can be repaired using a special adhesive. SEI recommends Aquaseal urethane
repair adhesive and Cotol-240 surface cleaner and cure accelerator for outer bladder permanent repair.
Pinholes, Small Scratches and Tears
1.
Clean the damaged area and ¼" beyond it with an abrasive pad and Cotol-240 (or isopropyl alco-
hol).
2.
Create backing with wax paper or masking tape if needed (to prevent the glue leaking through and
sticking to the inner bladder).
3.
Paint the damaged area and ¼" beyond edge with Aquaseal or Aquaseal mix. Aquaseal will cure
to full strength in 8 to 12 hours. To speed cure time to 2 hours, pre-mix one part Cotol-240 with
two or three parts Aquaseal before applying. Additional Cotol-240 can be added to thin Aquaseal
to desired viscosity.
4.
If the defect is not sufficiently fixed, a patch repair may need to be applied.
Cuts and Holes up to 1"
1.
Cut a patch. The patch should be at least 2" larger in every direction from the damaged area. A
round patch is recommended but, if a rectangular patch covers the damage better, then round all
corners.
2.
Draw an outline of the patch on the surface to be patched.
3.
Trim loose threads and loose coating on damaged area with scissors to a point where there is a
solid bond between the reinforcing fabric or scrim and the coating.
Important Note
If the size of the damaged area exceeds 1", please contact SEI Industries before making repairs.
Warning
Use of adhesive and accelerant can be dangerous and can have short term and long term
consequences for human health. It is important to take precautions and wear all appropriate safety
gear. Wearing gloves, a respirator, eye protection and working in a well-ventilated area can help
to mitigate these risks.
