General Machine Products 89300 AirStream Cable Blowing Machine - Manual (Page 31)

Page 31 of 44
17.0 Tube integrity and Lubrication
This is entirely the responsibility of the operator.
To be sure that the tube into which the cable is to be inserted is installed appropriately, it is recommended that
its integrity and lubrication be checked.
i.e. check that the tube is:
1. Not blocked
2. Not squashed
3. Continuous (i.e. it has not been fractured somewhere along its route and the fractured ends separated)
4. Also check that any joins are pressure tight
5. Finally check that the tube is appropriately lubricated.
The easiest and most straightforward way to complete these checks is to set the machine up for a normal
cable insertion but fit a seal in place of the cable. The tube can then be pressurized without running the belt
drive.
CAUTION: ANY OBJECT INADVERTENTLY LEFT IN THE TUBE DURING THE
TUBE LAYING MAY BE EXPELLED FROM THE END OF THE TUBE WITH HIGH
FORCE AND VELOCITY. IT IS IMPERATIVE THAT NO PERSONNEL BE IN THE
VICINITY OF THE END OF THE TUBE OR THAT A SUITABLE DEVICE IS FITTED
TO THE END OF THE TUBE TO ARREST ANY EXPELLED OBJECT.
The checks listed at 1-4 (inclusive) above may all be carried out at the same time using one check. The
procedure is outlined below.
Set up the air box and tube clamp as shown right.
When the air box has been set up as shown in
the photo, the air box and tube clamp should be
closed as for usual cable installation.
Fit the appropriate plug as shown
(see Appendix for plug number)
Fit the air box seal, tube and tube seal in
position as for normal cable installation