Handling
All Construction personnel involved in load/unloading or material
handling at the job site should be instructed to handle Permalok
Steel Casing Pipe in the following way. Remember, Permalok connectors
are precision machined parts and should be handled as such (gently):
•
Check
shipment first for receipt of a push ring and RTV silicone
tube(s).
•
Prior to unloading
Permalok casing, carefully inspect each piece visually and
note any damage or abnormalities on the carriers bill of lading.
•
Do not hook the
Permalok ends of the casing, unless using the special hooks
supplied by Permalok. Instead, use wrap-around straps. Lifting
lugs can be supplied upon request.
•
Use dunnage (or
4' x 4's) to stage pieces of Permalok Pipe. Do not lay the
pipe on the ground. (One end will always hit the ground first
and may cause damage.) Do not bump the ends of Permalok Pipe.
•
When placing
pieces of Permalok Casing in the launch shaft, it is suggested
that the push ring be placed on the female end after the pipe
has been lowered into position.
•
If the Permalok
Pipe has end protectors, they should not be removed until
the day the pipe will be used.
II.
Launch
Shaft or Pit Preparation
•
Your
trenchless excavation equipment will be needed to mate the
Permalok Connectors and will need to provide sufficient compression
force to complete the joint. Example: 24", Class 3 Permalok
will require approximately 10 to 20 tons (20,000 - 40,000
lbs.) of compressive force to complete the connection.
•
Preparations
must be made to restrain or hold the previously installed
casing in order to prevent movement while the jacking forces
are applied to mate the first few connectors. Consult your
Permalok Sales Representative for details and suggestions.
A good solid restraint is necessary for quick connections.
•
Your Permalok
Casing will come with a push ring, usually male, unless otherwise
requested. It will be the same diameter as the Permalok Casing
Pipe. Be sure the length of the push ring is accounted for
in your plan. It will add approximately 3" to 4" to
your casing length.
•
If you are pipe
ramming, an additional 12" reinforcing section will be
installed on the Permalok push ring. A variety of lead edge
reinforcements is available upon request.
•
The reinforced
Permalok push ring will be mounted to the pipe ramming tool
in one of several ways, depending on the make and model of
hammer. In all cases the combination of hammer and push ring
should be mounted to the casing with chain and strap rigging
that is sufficient to pull the push ring in tight to the female
Permalok end, so as not to allow any movement or vibrating
during ramming operation. Any movement could weaken the connection
and result in loss of ramming energy.
•
When stabbing
Permalok Pipe, remember, steel pipe is a flexible pipe and
should be stabbed from top to bottom or bottom to top, not
straight ahead: see the illustration below or contact Permalok
for further explanation.
IIII.
End
Preparation and Mating Procedure
•
Each
end (male and female) is shipped from the factory with a (wax
like) protective coating which will protect the machined surfaces
from corrosion in most outdoor conditions for several weeks.
This protective film must be removed prior to mating the Permalok
Connections. This is done using a petroleum based solvent.
•
Prepare ends
by cleaning with firm bristle or wire brush and petroleum
based solvent. Wipe clean and dry with shop towel or rag.
The machined surface must be dry, clean, smooth and free of
rust or weld spatter.
•
Prior to application
of RTV Silicone Sealant, please read label carefully. Note
curing time of 5 to 10 minutes and make sure not to allow
uncured silicone to contact skin or eyes.
•
Apply RTV Silicone
to distal end of male and female connectors, making sure that
a continuous bead of silicone encircles the circumference.
Spreading or tooling the silicone is optional. Align pipe
straight and mate the connectors.
•
After joint is
mated most of the silicone will be squeezed out of the joint,
some inside, some outside. There is no need to wait for silicone
to cure, you may begin installation immediately. It is good
practice to check the joint for complete closure all the way
around the circumference.
