Vent Pipe Preparation - A.O. Smith BPD-80 Series Installation And Operating Manual

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 (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" and above.
WARNING
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.
Read instruction manual before
installing, using or servicing
water heater.
36
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:
PVC Materials should use ASTM D-2564 Grade
Cement; CPVC Materials should use ASTM F-493
Grade Cement and ABS Materials should use
ASTM D-2235 Grade Cement. 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.
.
• 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.
RECOMMENDED BRUSH* SIZE FOR
PRIMER AND CEMENT APPLICATIONS
Nominal
Pipe (IPS)
2
3
*USE ONLY NATURAL BRISTLE
Table 7.
WARNING
Fire Hazard
Brush Size
1.5"
1.5" - 2.5"
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