18
WARNING
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 ventilated
area.
VENT PIPE PREPARATION
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.
2. SELECTION OF MATERIALS (PCV 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” and above.
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 Form amide (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
or ABS cement to join PVC or CPVC pipe and fittings. To join
PVC and CPVC materials, use ATSM F-493 compliant cement.
Summary of Contents for Standard Residential
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