Training Manual                                                             

Specific Techniques
Internal Patch

SCOPE:        
Describes the method for repairing a large tear in the body of an inflation compartment.

PURPOSE:        
Describes how to apply an internal and external patch.

EQUIPMENT:                    
Stanley Knife/Scissors
Sandpaper
Glue pot & 1” brush
Adhesive & hardener
Roller
Watch or 15 minute timer
Screwdriver or blunt object

PROCEDURE:
Where a puncture exceeds 50 mm in length an internal and external patch should be used.
The technique used for field repairs apply but an additional patch is placed on the inside of the damaged area.  This calls for special techniques to ensure the internal patch is correctly positioned.
1.  Prepare the internal patch and buff an area on the inside of the tube 10 mm greater than the patch.
2.  Lay the torn edges, of the tube, together and match mark both edges every 50 mm.



3.  Place patch in position under the damaged area and trace a line along the centre line of the patch to show where the tear will lie.  Then transpose match marks onto the patch.

4.  Allow preglue to dry over night.  In order to insert patch inside tube without contaminating the adhesive with your fingers, roll the patch in a layer of thick polyethylene sheet.  Insert it, then, using the match marks, align the patch;  contact one corner then proceed to fold out the patch over the glued area.



5.  After rolling, inflate and check that patch is airtight.  Proceed with external patch.


THIS INFORMATION IS SUPPLIED IN COMMERCIAL CONFIDENCE AND IS SUBJECT TO COPYRIGHT.


Lancer Industries Ltd,  
Auckland.  
Ph 64-9-837 1206   Fax 64-9-837 1208