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5.22.60 LABORATORY & DEIONIZED WATER SYSTEMS DESIGN AND CONSTRUCTION STANDARD 5.22.60 LABORATORY & DEIONIZED WATER SYSTEMS
DESIGN AND CONSTRUCTION STANDARD

Design & Construction Standards, Revised November, 2007
5.22.60-1
PART 1: GENERAL

1.01 Purpose:

A.
This standard is intended to provide useful information to the Professional Service
Provider (PSP) to establish a basis of design. The responsibility of the engineer is
to apply the principles of this section such that the University may achieve a level
of quality and consistency in the design and construction of their facilities.
Deviations from these guidelines must be justified through LCC analysis and
submitted to the University for approval.

1.02 Codes and Standards:

A.
Plumbing Code Compliance: Comply with applicable portions of International
Plumbing Code pertaining to selection and installation of plumbing materials and
products.

1.03 Requirements:

A.

The UT-Austin campus has a central system for distribution of de-ionized water
(DW). (For historical reasons, it is often referred to as distilled water.) The DW is
carried in pressurized polypropylene Schedule 80 lines in the utility tunnels.

B.

The central reverse osmosis/demineralizer system is designed to produce water
that meets the following quality specifications:

1.

Conductivity < 15 micro ohms/cm
2.

pH of 6.0 to 9.0
3.

Nonvolatile TOC content < 1.0 ppm

C.

If project requirements demand water quality in excess of that listed above,
provide supplemental point-of-use polishing systems necessary to provide a
continuous supply of water that meets individual water purity requirements.

D.

For buildings requiring DW, provide a 1 PVC 80 line from the tunnel DW main
up to a non-pressurized DW tank in the attic. Provide a stainless-steel orifice in
the line (1/4 for buildings with large DW demand, 1/8 for buildings with small
demand) to limit the amount of makeup to the tank. Provide a valved bypass line
around the orifice to allow expedited system refill after being drained.

E.

Provide a stainless-steel solenoid valve to maintain the level in the DW tank.
Provide a larger PVC line (often 2 inch) to allow DW flow by gravity or booster
pump system from the tank to the building uses. Booster pump systems shall be
required to provide adequate pressure to upper floors and building areas with high
volume demand equipment.

F.

An ultraviolet sterilizer shall be installed in the piping downstream of the DW 5.22.60 LABORATORY & DEIONIZED WATER SYSTEMS
DESIGN AND CONSTRUCTION STANDARD

Design & Construction Standards, Revised November, 2007
5.22.60-2
storage tank.

G.

DW Storage tank shall be provided with tank level sight glass. Sight glass shall be
piped external to tank and be provided with isolation service valves at top and
bottom of glass. Sight glass shall be equipped with high and low level switches.
Switches shall be located within the section of sightglass isolated by service
valves. Switches shall provide dry contacts for reporting conditions to
BAS/FCMS system.

H.

Provide means of flushing DW system from each end of main system feed on each
floor of building with access. New or modified systems shall be designed to
incorporate the means to maintain the integrity of water quality to prevent any
system contamination. Care shall also be taken to prevent contamination to
materials stored or in transit. Any modifications to the system piping or equipment
shall require prior notification and pre approval from UT Facilities Services.
Design shall provide for future remodeling and incorporate the flexibility to
accommodate future changes in research having minimal effect on adjacent labs
and research programs and the means to maintain the integrity of water quality
during any system modifications to prevent system contamination.

I.

Provide each riser connection serving a building floor or area with section valves
for isolation with access. Provide each branch connection to main feed serving a
floor or area with section valves for isolation with access. Branch connections
from main feeds shall be from top of header.

J.

Provide de-ionized water piping loop to minimize dead legs. Dead legs over
12 shall not be allowed.

K.

Provide circulation in all de-ionized water loops at three feet per second minimum,
with a target pipe velocity of five feet per second.

PART 2: PRODUCTS

2.01 Standards for Basic Identification:

A.
General: Piping identification Standard at the University is ANSI A13.1 "Scheme
for Identification of Piping Systems. All piping shall have flow arrows indicating
direction of flow.

2.02 De-Ionized Water Piping, Valves and Fittings:

A.
Pipe valves and fittings for purified water service shall be Schedule 80, Flame
Retardant natural virgin, unpigmented Polypropylene with socket thermo seal
fusion fittings.

B.
Installation practices, including support spacing and joint fusion, shall be in
compliance with manufacturer's printed recommendations. 5.22.60 LABORATORY & DEIONIZED WATER SYSTEMS
DESIGN AND CONSTRUCTION STANDARD

Design & Construction Standards, Revised November, 2007
5.22.60-3

C.
Materials from which pipe, fittings and valves are manufactured shall have been
tested and approved for conveying potable water by the National Sanitation
Foundation (NSF). All pipe, fittings and valves shall bear the NSF hallmark
indicating that the material has been tested and approved for conveying deionized
water by the national Sanitation Foundation.

D.
To ensure installation uniformity, all system piping components shall be the
products of one manufacturer.

E.
All piping shall be thoroughly rinsed and flushed to remove all dirt and debris
before installation. After installation the Contractor shall flush the entire piping
system with de-ionized water to the satisfaction of the Owner.

F.
All piping exposed within plenums shall have a smoke-developed index of no
more than 50 and flame-spread index of no more than 25. All non-conforming
piping material located in plenums shall be sleeved. Contractor shall provide a
sleeved system through the installation of grooved Schedule 10 galvanized piping
and couplings. The sleeve piping shall be no less than 2 inches greater diameter
than the polypropylene piping contained within it. Only rolled groove piping may
be used. The Victaulic "Fit" fittings and piping system, or any similar set screw
type fitting system is specifically prohibited. Vic-Let and Vic-O-Well or similar
type fittings are specifically prohibited for use in this application. Where a reduced
tee fitting is required, then a reducing tee or regular tee with bell reducer shall be
used. If any of the above described prohibited materials or installation methods
are used, then the material or installation method shall be corrected at the
contractors expense.

G.
Valves shall be ball valve type and shall be manufactured of the same virgin,
unpigmented molding compound as the fittings to assure compatibility.

H.
All ball valves shall have Viton seals, and PTFE seats. Ball valves shall carry a
pressure rating of 150 psi at a minimum of 68F, and shall be of True Union design.

2.03 DEIONIZED WATER PUMPS:

A.
Pumps shall be heavy duty plastic or stainless steel duplex, centrifugal type.

B.
Pump heads, sleeve and impeller shall be polypropylene or stainless steel. Seal
shall be mechanical type.

C.
Each pump shall be provided with a fused safety switch and a magnetic starter
providing overload and under voltage protection. A mechanical alternator shall
automatically alternate the operation of the pumps.
5.22.60 LABORATORY & DEIONIZED WATER SYSTEMS
DESIGN AND CONSTRUCTION STANDARD

Design & Construction Standards, Revised November, 2007
5.22.60-4
D.
Pumps shall be furnished completed with Vinton, or approved equal, suction and
discharge pressure gauge isolator-activators to separate gauge from deionized
water.

2.04 LEVEL
CONTROLLER

A.
Level controller shall be full plastic body type with no metal parts in contact with
deionized water.

2.05 PRESSURE
TANKS:

A.
Furnish and install heavy duty plastic pressure tanks with interior rubber sleeve.