User Guide
Table Of Contents
- Introduction
- Codes, Standards, and Certifications
- PureFlow Press Fittings
- PureFlow Crimp Fittings
- PureFlow Tools
- Product Instructions
- Tubing Overview
- Design Considerations
- ManaBloc Systems
- Installing PureFlow Systems
- Storage Recommendations
- Handling Viega PureFlow PEX Tubing
- Removing PureFlow Connections
- Repairs
- Freezing
- Water Heaters
- Heaters, Flues, Vents, and Recessed Lights
- Fastening the PureFlow System
- Supporting PureFlow PEX Tubing
- Installation Considerations
- Noise and Water Hammer
- Shower Valves
- Electrical Grounding
- Expanding Foams
- Fire Stop Compounds
- Tubing Expansion
- Calculating Expansion Loops and Offsets
- Domestic Hot Water Circulating Systems
- Installing Viega PureFlow Fittings
- PureFlow PEX Tubing Installed in Slab
- Installing PEX Under a Slab
- Installing PEX Below Grade as Service Line
- Pressure Testing PureFlow Systems
- System Disinfection
- Limited Warranty
Installing PureFlow Systems
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PG-PF 724998 0320 PureFlow System
There are three types of expansion
osets recommended for use with large-
diameter tubing: the corner expansion
oset, the Z-type expansion oset, and
the U-type expansion loop. Descriptions
and illustrations for each type of oset
are located on the next several pages
(see “FostaPEX” on the facing page for
FostaPEX recommendations).
Corner Expansion Oset
Where piping takes a corner after a long
straight run, a simple 90° elbow in the piping
will allow for the absorption of expansion.
Calculating Expansion Loops and Offsets
Z-Type Expansion Oset
The Z-type expansion oset integrates
two 90° elbows that form a “Z” pattern.
L2
L2
LT
L1
Z-Type Offset
∆L
∆L
Anchor point
Z-Type Offset
Anchor point
L1 = 10.35"
L2 = 5.18"
L2 = 5.18"
Z-Type Expansion Example
Corner Expansion Example
Corner Offset
L
LT
∆L
Anchor point
Anchor point
Corner Offset
L = 20.7"