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Vent Pipe Preparation
NOTE: Before preparation see also "Venting
Installation" section.
1. INITIAL PREPARATION
• Make sure the solvent cement you are
planning to use is designed for the specific
application you are attempting.
• Know the physical and chemical
characteristics and limitations of the PVC and
CPVC piping materials that you are about to
use.
• Know the reputation of your manufacturer
and their products.
• Know your own qualifications or those of your
contractor. The solvent welding technique of
joining PVC and CPVC pipe is a specialized
skill just as any other pipe fitting technique.
• Closely supervise the installation and inspect
the finished job before start-up.
• Contact the manufacturer, supplier, or
competent consulting agency if you have any
questions about the application or installation
of PVC and CPVC pipe.
• Take the time and effort to do a professional
job. Shortcuts will only cause you problems
and delays in start-up. By far, the majority of
failures in PVC and CPVC systems are the
result of shortcuts and/or improper joining
techniques.
NOTE: Polypropylene systems are not cemented
together. See separate instructions obtained from
your supplier.
2. SELECTION OF MATERIALS (PVC and CPVC
VENTING)
• Cutting Device - Saw or Pipe Cutter
• Deburring Tool, Knife, File, or Beveling
Machine (2" and above)
• Brush - Pure Bristle
• Rag - Cotton (Not Synthetic)
• Primer and Cleaner
• Solvent Cement - PVC for PVC Components
and CPVC for CPVC Components only
• Containers - Metal or Glass to hold Primer
and Cement. Select the type of PVC or
CPVC materials to be used on the basis of
their application with respect to chemical
resistance, pressure rating, temperature
characteristics, etc.
• Insertion Tool - Helpful for larger diameter
pipe and fittings 6" (152mm) and above
31
Fire or Explosion Hazard
• Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
• Avoid all ignition sources if you smell gas.
• Do not expose water heater control to excessive gas
pressure.
• Use only gas shown on rating plate.
• Maintain required clearances to combustibles.
• Keep ignition sources away from faucets after extended
period of non-use.
l_ Read instruction manual before
installing, using or servicing
water heater.
Primer:
It is recommended that Tetrahydrofuran
(THF) be used to prepare the surfaces of pipe
and fittings for solvent welding. Do not use
water, rags, gasoline or any other substitutes
for cleaning PVC or CPVC surfaces. A
chemical cleaner such as MEK may be used.
Cement:
The cement should be a bodied cement
of approximately 500 to 1600 centipoise
viscosity containing 10-20% (by weight) virgin
PVC material solvated with Tetrahydrofuran
(THF). Small quantities of Dimethyl
Formamide (DMF) may be included to act
as a retarding agent to extend curing time.
Select the proper cement; Schedule 40
cement should be used for Schedule 40 pipe.
Never use all-purpose cements, commercial
glues and adhesives orABS cement to join
PVC or CPVC and s.
i
Fire Hazard
• Primers and cements are
extremely flammable, and must
not be stored or used near heat
or open flame.
• Also, use only in a well venti-
lated area.
Applicators:
Select a suitable pure bristle type paint brush.
Use a proper width brush or roller to apply
the primer and cement (see chart below).
Speedy application of cement is important
due to its fast drying characteristics.
IMPORTANT NOTE: A dauber type applicator
should only be used on pipe sizes 2" and below.
For larger diameter pipe, a brush or roller must be
used.
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