DUAL-GARD DI0 pages

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PERMA-PIPE / RICWIL
Preinsulated Piping Systems

DUAL-GARD D.I. ™
For Underground Chilled Water
and Low Temperature
Hot Water Installations

. Ductile Iron Service Pipe Provides
High Corrosion Resistance for
Underground Applications

. Closed-Cell Polyurethane Foam
Insulation Offers Low Heat Loss
and High Resistance to Water Absorption

. Outer PVC or PE Jacket Protects
Insulation and Service Pipe
PERMA-PIPE® / RICWIL®
DUAL-GARD D.I.TM is a factory
fabricated, insulated piping system
designed for underground chilled,
hot or dual temperature water distribution. The system consists of ductile
iron service piping with integral, gasketed bell joint, polyurethane foam
insulation and a PVC or PE outer jacket.
DUAL-GARD D.I.TM Features
Service Pipe
Ductile Iron (D.I.) service pipe is
supplied in Class 51 (3” and 4”) and
Class 50 (6” - 24”) with a working pressure of 250 psi,plus a 100 psi surge
allow-ance.
The service pipe is
cement lined with or without asphaltic
sealcoating depending on application/
specification
to A N S I / AW WA
C104/A21.4 standards. The exterior is
asphaltic coated. SBR rubber gaskets

are designed for constant operation
up to 150°F. EPDM gaskets are available for operating temperatures to
225°F. Pipe is furnished in 18 foot to
20 foot nominal lengths.
Insulation
Rigid closed-cell polyurethane foam
insulation completely fills the annular
space between the service pipe and
the outer jacket, providing low thermal
conductivity and high resistance to
water absorption. Insulation nominal
density is 2 lb/ft3. The coefficient of
thermal conductivity (K) is 0.18 BTUin/hr/ft2/°F at 73°F. Closed-cell content is 90 to 95%.
Jacket
Polyvinyl Chloride (PVC) or polyethylene (PE) plastic outer jacket provides
tough, rigid yet flexible protection for

both the insulation and the service
pipe. Jackets can withstand H-20
loading with two feet of cover and ends
have a factory-applied moisture barrier.
Fittings
Fittings are push joint, mechanical
joint or restrained joint and manufactured from ductile iron. Fittings are
rated to a minimum of 250 psi (3” - 12”)
and 150 psi (14” - 24”) and meet applicable requirements of ANSI/AWWA
C110/A21.10. Push joint and mechanical joint components are in accordance with ANSI/AWWA C110/A21.11.
All fittings are cement lined depending
on a p p l i c a t i o n s / s p e c i f i c a t i o n s .
Exteriors are coated with asphalt.
Thrust blocks are required at all
changes of direction for push joint and
mechanical joint systems.