Attachment_6_Specifications.pdf

DM SWIMMING POOL DMAFB

Project No. FBNV 924005R1 Tucson, AZ

SWIMMING POOL FILTRATION

13220-1

SECTION 13220

PART 1 GENERAL

1.01 WORK INCLUDED

A. Filtration System

B. Ozone Generation

C. Bromine System

D. Pool Controller

PART 2 PRODUCTS

2.01 FILTRATION SYSTEM

A. The filtration system specified under this section shall be a fully automatic pressure high-rate, permanent media filter manufactured by Environmental Products are acceptable.

B. The filter system shall be the standard product of a company regularly engaged in the manufacture of water filtration equipment with a minimum of five years experience in manufacturing high-rate filter of this type for public and institutional applications. The filter system shall be of the horizontal type, suitable for a single grade of media, and shall be listed by the National Sanitation Foundation (NSF).

The filter system shall consist of four (4) horizontal filter tanks with internal distribution and collection systems, operating valves, filter control console, gauge panel, air relief system and backwash sight glass.

C. The filter system shall consist of four (4) high-rate permanent media filter tanks with a total effective area of 66 square feet. When operating at 10 gallons per minute per square foot of filter area, the filter system will have a capacity of filtering 660 gallons per minute.

D. The tank shall be designed for a maximum operating pressure of 100 psi and designed with a safety factor of 4 to 1 for minimum burst pressure. The design shall also accommodate passage of 0 to 100 psi cycle test of 250,000 cycles without failure.

E. The tank shall incorporate a single piece barrier/inner tank, which will isolate the fluid contents of the tank to eliminate corrosion, intrusion or reaction. This inner shell shall be constructed of virgin FDA approved high stress-crack resistant polyethylene, 5/16� minimum thickness.

F. The tank�s outer shell shall be constructed of continuous fiberglass roving with a laminate matrix of pigmented epoxy resin with hardener. The entire tank assembly shall be oven cured, following fabrication, to assure uniformity of strength. Following oven cure, the entire assembly shall be coated with a clear UV inhibiting urethane protective coating.

G. An access manhole/viewing window shall be fitted at the front end of each tank, providing ease of access for media loading, service and observation of media during operation.

H. Each filter vessel shall be suitable supported as recommended by the manufacturer. Each filter tank shall bear a permanently affixed manufacturer�s nameplate.

13220-2

I. Internal Distribution and Collection System: Internal components shall be hydraulically balanced to prevent migration of the filter media during the filtration cycle and must uniformly fluidize the media in the backwash cycle without channeling or breakthrough at any location. During �OFF� cycle, filter system shall remain full of water.

J. The influent distribution system shall consist of no less that ten (10) hydraulic distribution lenses, which shall be fabricated of ABS plastic and PVC pipe and fittings. Distribution systems consisting of slotted pipes, or splash plates will not be acceptable. The collection system shall consist of PVC fittings, Schedule 80 PVC pipe and molded ABS �V� slotted 12� long threaded laterals. The laterals shall be capable of retaining a #30 grade filter media with minimum head loss. Laterals, which are made from plastic pipe with, saw cut slots or mesh covered pipes, will not be allowed. A minimum of twenty-four (24) molded laterals shall be utilized in each filter tank and the velocity through them shall not exceed 6 feet per second at the designed filter flow rate. All internal components, including main headers, must be removable for repair and/or replacement.

K. Air Relief System:

1. An internal automatic air bleed system shall be provided in the tank. An anti-plug protective shield screen shall be installed on each assembly. A manually operated external air relief valve shall be provided on the tank.

L. Winterizing/Drain and Media Dump Port:

1. In the front of the vessel shall be located a 3/4� drain fitting, which shall allow the evacuation of all water from the tank for the purpose of winterizing or service. A 3/4� o-ring seal plug adapter shall be provided for ease of removal and replacement. No media shall be allowed to leave the tank during the draining process.

2. The media dump port shall allow for removal of all filter media from the vessel with 30 minutes. This dump port shall be a minimum of 2� in diameter and shall be installed in the front of the filter vessel, allowing for easy access.

M. Each filter tank in the system shall be backwashed individually using filtered water from adjacent tanks. The maximum backwash flow rate of the filter shall not exceed 250 gallons per minute.

Reverse flow backwash with raw source water will not be acceptable.

1. Backwash Valve:

a. One (1) two-way, three-port backwash valve shall be supplied on each filter tank.

The valve body shall be machined from heavy cast bronze. Each valve shall be fitted with a nominal 6� diameter piston-operated hydraulic cylinder to actuate the valve. External valve linkage will not be allowed. The internal piston shaft shall be Type 302 stainless steel and shall be supported above and below the piston with Delrin guide bushings. A silicon-impregnated felt wiper shall be provided for internal shaft quad-ring lubrication. All stainless steel components shall be passivated and rinsed after forming and machining.

b. The backwash valve shall be designed to allow for continuous circulation pump operation during backwash of the filter system.

2. Priority Valve:

a. A hydraulically operated modulating valve shall be supplied for use on the effluent manifold. The valve�s size shall match that of the effluent manifold. The priority valve shall be field adjustable, assuring the proper system flow, allowing for the

13220-3 designed backwash flow. The priority valve shall operate automatically in concert with the system�s backwash valves.

3. Piping:

a. The influent, effluent and waste manifolds shall be constructed of PVC Schedule 80 pipe and fittings. System shall be fitted with a manual flow control valve on the effluent manifold. The waste line shall be fitted with a waste control valve and clear sight glass assembly. All piping shall be factory assembled and pressure tested.

4. Backwash Flow Rate:

a. A 4� flow meter saddle with plug shall be provided and installed on the backwash piping following filter system, per the filter manufacturer�s instructions. The flow meter saddle will be used at time of system start-up to verify backwash flow rate.

N. The filter control console shall govern the operation of the filter system with logic provided by a programmable microprocessor. The console shall also provide direct readouts for modes of operation, filter flow rate and water temperature. Units, which require scrolling to view modes of operation, will not be allowed. All components of the console shall be housed in a fully gasketed NEMA 4X hinged, non-conductive enclosure featuring internal and external locking devices, plus a full-view window.

1. The control console shall provide the following features and functions:

a. day/24 hour on/off circulation pump time clock

b. day/24 hour backwash initiation time clock

c. Manual initiation of backwash with dial or push button

d. Adjustable differential pressure backwash initiation

e. Fail-safe monitor and shut down of backwash cycle if not completed in allotted time

f. Fail-safe monitor, alarm and shut down of pressure to backwash valves to prevent unwanted multiple backwashes

g. Continuous operation of circulation pump prior to and throughout entire backwash cycle

h. Cool-down mode for pool heater or heat exchanger prior to pump shutdown or backwash cycle.

I. Terminal hook-up board and switching to control accessory equipment

j. Battery backup to maintain time clock during power failure

k. Retention of pump and filter programming during power failure and loss of battery power

l. Backwash counter

m. Constant digital display of system flow in GPM or M/hr with flow sensor, 25-foot cable and sensor mounting saddle

13220-4

n. Constant digital display of water temperature in Fahrenheit or Centigrade

o. Power input of 115 VAC, 60 Hz

2. The entire filter control console shall be listed by underwriters Laboratories, Inc. (U.L.) as a filter controller under standard 508, industrial controllers. Documentation from U.L. will be required to confirm console is so listed.

O. A cast urethane gauge panel shall be mounted on the automatic filter control panel. It shall be fitted with two (2) 4-1/2� diameter, 0 - 100 psi pressure gauges and a field settable differential pressure gauge/switch.

P. A self-powered paddlewheel flow sensor with saddle fitting and a 25-foot cable shall be provided to sense system flow and send a signal to control console

Q. An internal automatic air bleed system shall be provided in each tank. An anti-plug protective shield screen shall be installed on each assembly. A manually operated external air relief valve shall be provided on each tank.

R. An in-line �Y� strainer, 2-1/2� 0 - 100 psi pressure gauge and pressure regulator shall be supplied as part of the filter system. The pressure supply system shall clean and govern the pressure of the water used to actuate the filter valves.

S. Certified engineering drawings and calculations will be required for structural strength of filter tanks and seismic loads. Proof of National Sanitation Foundation (NSF) and Underwriters Laboratories listings specified above will also be required.

T. Access to manholes, backwash valves and filter control console shall be from front of filter system only and shall not require climbing over or around tanks, manifolds or valves.

U. Printed and bound operating, installation and service manuals with exploded parts list shall be supplied with the filter system.

V. Filter media shall be of single grade and consist of uniformly graded, angularly shaped, crushed silica sand which shall be free of limestone or clay. Filter media shall be grade #20, effective size 0.45 millimeter with a uniformity coefficient of 1.5 maximum. Twenty (20) cubic feet will be required for each tank. Media must be removable from tanks through dump port and not require removal through manhole or disassembly of face piping. Systems requiring multiple grades of media will not be approved.

W. To supply water pressure to operate the backwash valves, the system will include a pressure amplification system consisting of a centrifugal pump, hydro-pneumatic pressure sustaining tank, adjustable pressure switch, 50 feet of 3/8� Nylo Seal tubing and all necessary tubing connectors.

X. A 25 year warranty shall be provided by the filter manufacturer covering all components of the system as follows:

1. First Year - Complete system - 100% parts and labor

2. Years 2 and 3 - Tank and internal components - 100% parts

3. Years 4 thru 10 - Internal and external components prorated

4. Years 11 thru 25 - Tank prorated