Warranty Guide

119
Water Hammer Arrestors
Quick closing valves, actuated valves, starting or stopping
pumps or rapid increases or decreases in system flow rate
can result in pressure surge or “water hammer” capable of
damaging PVC or CPVC piping systems. Systems should be
designed by the engineer of record and in conformance to local
code requirements to manage the effects of pressure surge. In
applications where severe or repeated water hammer is encoun-
tered, especially at elevated temperatures or in a commercial
laundry or commercial kitchen, the use of a water hammer
arrestor is advisable.
Hydronic Heating, Chilled
Water or Geothermal
Applications
When plastic piping is used for recirculating systems such
as hydronic, chilled water or geothermal heat pump systems,
careful consideration of piping material characteristics and
system requirements must be made. This includes taking
into account pressure, temperature, flow velocity, design
stresses, environmental factors and the chemical resistance
of the piping materials to the fluids (heat-transfer fluids,
anti-freeze solutions and other chemicals) in the system.
Ultimately the engineer, designer or owner must evaluate
these characteristics and system requirements in order
to select the correct piping product for the particular
application. The table below highlights some of the key
points to consider when designing or installing these types
of systems.
This manual is not a complete engineering reference
addressing all aspects of design and installation of these
systems. Many excellent references are available on
this topic. The International Ground Source Heat Pump
Association: www.igshpa.okstate.edu or The GEO Exchange
at www.geoexchange.org.
CPVC CTS FlowGuard Gold does not typically require an
oxygen barrier. In accordance with ASTM D 2846, CPVC
CTS is manufactured as a solid-wall piping system and is
not manufactured in a cross-linked or co-extruded process
like other materials that are prone to oxygen permeation.
Unlike CPVC, some cross-linked systems used in applications
such as hydronic heating require a layer of aluminum to be
present to stop oxygen diffusion through the polymer matrix.
With regard to oxygen permeability of a CPVC system, the
following data should be considered:
1) The oxygen transmission rate in CPVC at 73°F (23°C) is
approximately 7.2 cc/(m
2
/day).
2) The oxygen permeation coefficient in CPVC at 73°F
(23°C) is approximately 180 cc/mil/(m
2
/day/atm).
3) The oxygen diffusion coefficient in CPVC is approximately
6.25e/9 cm
2
/sec.
“DOs” for all hydronic applications
• Do install CPVC Schedule 80 domestic water systems using
IPS P-70 or Oatey Industrial Grade primers.
• Do install CPVC Schedule 80 domestic water systems
using IPS 714 or Oatey CPVC Heavy Duty Orange solvent
cements.
• Install in accordance with both Charlotte Pipe and Foundry’s
and solvent cement manufacturer’s recommendations and
installation instructions.
• Follow recommended safe work practices.
• Verify that the maximum outlet temperature and pressure of
the boiler is less than the temperature and pressure rating
of the pipe (see charts below).
• Always use the proper derating factors with FlowGuard
Gold and Corzan CPVC pipe to find the pressure rating at
the applicable operating temperature.
• Always follow applicable codes and approvals when
installing plumbing and heating equipment.
• Ensure that the system design allows for thermal expansion
and contraction as recommended in the Charlotte Pipe and
Foundry Plastics Technical Manual.
• Use only CPVC x brass threaded transition fittings when
installing FlowGuard Gold systems.
• Use proper solvent cementing practices, including beveling
and proper dauber sizing.
• Align all piping system components properly without strain.
Do not bend or pull pipe into position after being solvent
welded.
• Provide additional support to the brass side of a CPVC x
SUPPLEMENTAL INFORMATION
Prior to installing PVC or CPVC piping in hydronic
applications, it is important to flush the interior of the heat
exchangers and the exterior of the evaporator coils
thoroughly with a mild ionic detergent solution to remove
incompatible oils. Failing to do so could result in system
failure and property damage.
Verify that all boiler cleaning and sealing chemicals used in
hydronic radiant heating systems are compatible with PVC
or CPVC. Failure to do so could result in system failure and
property damage.
Equipment leaks in refrigeration or HVAC systems may
release POE oils or other contaminants into the piping
system. These oils and contaminants are incompatible with
PVC or CPVC and such exposure may result in pipe or
fitting failure regardless of flushing.