Submittal Sheet

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ES-PFNGVP 1210
5 of 7
Engineering
Specifications
PART 3 – EXECUTION
3.1 EXAMINATION
3.1.1 The installing contractor shall carefully examine the PEX tubing for defects,
cuts, abrasions, cracks, fading color, or blemishes. There shall be no cracks
or heavy deformations of the tubing. Fittings and manifolds shall be checked
for any signs of abuse. Any damaged tubing or fittings shall be rejected.
3.2 PREPARATION
3.2.1 ViegaPEX Tubing: Cross-linked Polyethylene tubing shall be cut with a PEX
tubing cutter. The tubing shall be cut squarely and neatly to permit a proper
connection between the tubing and fitting.
3.2.2 FostaPEX Tubing: Cross-linked Polyethylene tubing shall be cut with a PEX
cutter. The tubing shall be cut squarely and neatly to permit a proper
connection between the tubing and fitting. The outer polyethylene and
aluminum layers shall be removed with a Viega supplied prep tool leaving the
inner PEX tubing to accept the PEX Press fitting and stainless press sleeve.
The prep tool shall have an internal stop to ensure proper length of exposed
inner PEX tubing.
3.3 INSTALLATION GENERAL LOCATIONS
3.3.1 Plans indicate general location and arrangement of PEX system. Identified
locations and arrangements are used to size pipe and calculate friction and
loss and other design considerations. Install PEX tubing as indicated, except
where deviations to layout are approved on coordination drawings.
3.4 INSTALLATION, PEX TUBING
3.4.1 Pressure Rating: Install components having a pressure rating equal to or
greater than the system operating pressure.
3.4.2 Install PEX tubing that is free of blemishes, cuts, gouges, kinks or noticeable
fading of color.
3.4.3 Changes in Direction: PEX tubing shall not exceed an eight times the tubing
outside diameter (OD) free bend radius or a five times the tubing OD
supported bend radius, with use of a Viega approved bend support. Install
fittings for changes in direction where any minimum bend radius is
exceeded and branch connections.