Water Treatment Equipment Manufacturer

GENERAL SPECIFICATION

LTF- 4 SERIES RO

The LTF4 Series Reverse Osmosis Units are available with nominal capacities from 70,000 to 216,000 GPD.  These are heavy-duty industrial quality systems designed to produce high quality, low TDS product water from ordinary tap water or brackish water supplies.  Each system shall be computer designed to ensure reliable long-term operation. A computer printout of the final product water quality shall be furnished for each application.  The unit shall be skid mounted, pre-piped, wired and factory tested by manufacturer engineers for shipment. The following standard equipment is included:


MEMBRANES

The RO membranes shall be ISO 9001 and ISO 14001 certified, 8x40 inch high rejection brackish thin film composite membranes.  The membranes shall be constructed using cross linked polyamide composite material, split ring and 34 mil. Feed spacer rated at a nominal product capacity of 11,000 GPD. The membrane design shall have a chloride ion rejection of 99.8%, operating pH range of 4-11 and have a chlorine tolerance of <0.1 ppm.

HIGH PRESSURE PUMP

A single or alternating high pressure NSF-61 certified vertical multi-stage pump with 300 # flanged ends shall be furnished to provide the optimum membrane feed pressure and flow.  The pump shall be constructed by an ISO-9001 facility with 316 stainless steel metallic wetted parts, AISI 316. The primary rotating seal and stationary seat shall be silicon carbide or EPDM material. TEFC motor rated for 3500 RPM, 460 VAC, three phase, 60 Hz. Power supply. A variable frequency drive (VFD) shall be available from the manufacturer. (Pump discharge check valve optional)

PRESSURE VESSELS

The membrane pressure vessels shall be constructed of composite FRP with finish coat of white high gloss and rated at 300 psig.  Feed and concentrate discharge connections shall be side-entry, 316 stainless steel Victaulic grooved couplings. Each vessel shall contain either 4 or 6 membranes and shall be equipped with a product water sample valve. Permeate connections shall be constructed with schedule 80 PVC socket welds. Vessel concentrate discharge will directly enter feed port of next vessel bank utilizing multi-port design.

CARTRIDGE PREFILTER

A stainless steel cartridge pre-filter housing, 150 # flanged, (3) angle legs w/ foot pads, ½ FNPT gauge ports and vent, 1” FNPT drains and swing bolt cover shall be provided to remove particles larger than 1 microns from the RO feed water. The cartridge seat shall be dual purpose type that will accept either double open end or 2-222 O-ring cartridges. The filter elements shall be sized for a maximum of 4.0 GPM per 10-inch length and are constructed using FDA approved polypropylene. The filter housing shall be constructed of 304SS and rated for 125 psig.

CONTROL VALVES

Pump throttling, concentrate and reject valves shall be an in-line 316 stainless steel ball style valve with a rating of 300 PSIG. The reject control valve shall be furnished with an anti-cavitation orifice plate to reduce cavitation and noise. The inlet isolation valve, permeate and concentrate check valves shall be PVC with EPDM internals. Product sampling valves shall be provided for the inlet and outlet sediment pre-filter, concentrate outlet and product inlet piping.

Each vessel product port shall be installed with PVC sample valves for testing.

FEED WATER VALVE

 An automatic feed water valve shall be furnished to shut-off the feed water flow, when the RO system is not in operation.  The valve shall be diaphragm actuated using hydraulic or air pressure constructed of glass reinforced Noryl and solenoid operated. Air actuated solenoids shall require customer compressed air that is clean and dry with a minimum 80 PSIG and a volume of 1-2SCFM. A bi-directional lug body butterfly with electric actuator shall be an alternative valve option available by the manufacturer. Butterfly valves shall be constructed with cast iron body, 316 SS disc and system, EPDM liner, manual override, visual mechanical position indicator, anti-condensation heater and (4) SPST contacts for open/closed remote indication,

FLOW METERS

Flow sensors shall be furnished to monitor the product and concentrate flow rates and must be ISO9001 certified, highly repeatable and have open collector signal with a wide dynamic flow range of 0.1 to 6m/s. Electrical requirements shall consist of: Supply voltage 5 to 24 VDC, supply current <1.5 mA @ 3.3 to 6 VDC / < 20mA @ 6 to 24VDC. Output collector, sinking 10 mA max. The manufacturer shall program the correct K factor in the PLC controller.

PRESSURE GAUGES & SAMPLE VALVES

Racked & labeled pressure gauges shall be included for monitoring cartridge filter pressure loss, pump suction pressure; membrane feed pressure, pump discharge pressure, membrane reject pressure and product pressure. The pressure gauges shall be heavy duty industrial grade, 2.5” diameter, liquid filled with 316SS wetted parts and stainless steel casing.  Sample valves with-out isolation valves shall be provided for checking the quality of the filtered feed water, reject, combined product and the product from the individual vessels.

CONTROL PANEL

The control system shall utilize an industrial programmable 1400 Allan Bradley (PLC) logic controller, IEC motor starter, control transformer, elapsed time meter, and fuses to automatically control the system. The system shall include interlocks for the product tank level controller, pretreatment equipment regeneration and automatic system flushing. Pilot lights and audible alarms shall be furnished to indicate system operation and status.  Selector switches shall be included to control system operation mode.  An appropriately sized disconnect switch shall be provided. The programmable controller and operator interface shall activate all solenoid valves, pumps and motors, which control water flow.  The operator interface shall feature a 6 inch EZ Color touch screen display with Serial and Ethernet communications and built-in USB, allowing the operator to interface with the programmable regeneration controller. The operator interface shall display historical alarms, time, system status, conductivity, product and drain flows, pH, ORP and totalized gallons. The entire system shall be mounted in a NEMA 4 enclosure for corrosion and water resistance. Selector switches shall be included to control system operation mode. Programming shall include hold, advance, resume, terminate or close of inlet valve and pump function, for fast, easy field service?

CONDUCTIVITY TRANSMITTER

The conductivity transmitter shall be constructed of a Ryton body, Valox (PBT) electronics housing and NEMA 4 enclosure. Operating range shall be 0-1000uS digital output, manufactured under ISO 9001 / ISO 14001 shall be provided to measure the product water quality. The conductivity meter shall include high conductivity audible alarm in the PLC and a temperature compensated conductivity cell. The conductivity sensor shall be in-line integral mounted and shall provide a 4-20 mA output.

AUTOMATIC FLUSH

A motorized operated flush valve shall open followed by a delayed Permeate flush valve opening. This flush cycle shall rinse the RO membranes at low pressure when the RO unit is shut down and then periodically, while the system is in stand-by.  This shall reduce scaling and fouling of the RO membranes by providing the highest quality water available to flush, preserve and extend membrane life to the fullest extent possible. 

PRESSURE SWITCHES

Pressure switches shall be provided to monitor the high pressure pump suction pressure and membrane feed pressure.  The switches shall automatically shut off the system if there is inadequate feed pressure to the high pressure pump or if the membrane feed pressure exceeds the maximum limit.  The pressure switches are constructed with brass wetted parts and mounted in NEMA 4 main control panel.

PIPING

The system piping shall be header constructed of non-corrosive materials with flanged connections.  The low pressure piping shall be constructed of type 1 SCH80 PVC socket welded PVC fittings and assembled to the fullest extent.  The high pressure piping shall be constructed of header welded 304SS with tapped ports for gauges. High pressure instrumentation tubing shall be rated for 1000 psig burst nylon.

SKID MOUNT, PRE-PIPED, PRE-WIRED

The RO shall be skid mounted on a 4" or 6" channel iron skid or optional fiberglass, assembled with stainless steel hardware for corrosion resistance and reduced system maintenance. The skid shall be cross-braced with 4" or 6" channel, angle iron with legs for an elevated skid. All steel surfaces shall be painted safety blue with a high epoxy coating and fiberglass shall be finish gray. All inlet, outlet and drain piping flanges shall terminate inside the skid area. All piping shall be suitably supported and anchored to the skid. All electrical wiring shall between systems shall be interconnected, and the hydraulic or pneumatic tubing shall be installed as part of the skid package. The entire skid mounted system shall be leak and electrically tested as a unit by the manufacturers designing engineer before shipment.

Optional Equipment and RO Pre-Treatment

pH METERS

The pH electronic assembly shall be constructed of Ryton body, Valox (PBT) electronics housing and NEMA 4 enclosure. Operating range shall be 0-14pH/2000mV and manufactured under ISO 9001 and ISO 14001 shall be furnished to measure the pH feed and/or product waters.  The pH response time shall be < 5 secs. for 95% of signal change. The PLC digital panel shall display high and low pH, audible alarms and a system interlock to shut-down the RO system if the pH is out of limits. A 4-20 mA output shall be provided for remote monitoring. Temperature compensated pH probes with a flat glass sensing surface electrode shall be mounted in-line.

ORP METER

ORP meter assembly shall be constructed of Ryton body, Valox (PBT) electronics housing and NEMA 4 enclosure. Operating range of 0-14pH/2000mV and manufactured under ISO 9001 and ISO 14001 shall be furnished to measure the ORP feed and/or product waters. This is the RO feed water oxidation reduction potential.  The ORP meter shall be used to sense for chlorine presence in the RO feed water. The ORP meter shall include PLC digital display, 4-20 mA output, high ORP audible alarm, RO system shutdown and temperature compensated ORP probe. A flat glass sensing surface electrode shall be an inline integral mount.

SDI TEST KIT

SDI test kit shall be furnished to determine the feed water silt density index and its tendency to foul the RO membranes with silt and organics.  The SDI test kit includes a pressure gauge, pressure regulator, filter apparatus and beaker all frame mounted on the RO system.

MULTI-MEDIA FILTER

Multi- Media filters shall reduce the turbidity down to 10 microns. The lower the SDI number, the better protection of the membranes from fouling. This system shall backwash and clean the filter bed based on a 10 lb. pressure differential. The filter media shall consist of a top layer of anthracite, middle layer of silica sand and a bottom layer of multi-grade garnet. Single units shall have an RO lock-out function to prevent the RO from operating until regeneration is complete. Twin systems shall switch from one tank to another to provide continued RO water production 24/7.

ACTIVATED CARBON

Carbon filtration shall be designed to provide membrane protection by removing the free chlorine that causes membrane destruction. Carbon filters shall require 12x40 mesh, acid washed, bituminous coal based activated carbon and shall be replaced when free chlorine residual is detected. There is an industry rule of thumb, one cubic foot of carbon will remove 1ppm of chlorine for an estimated one million gallons of water usage per cu/ft. The 111 rule is just an estimate, since other water constituents are in the water and take up the sites as well. Single units shall have an RO lock-out function to prevent the RO from operating until regeneration is complete. Twin systems shall switch from one tank to another providing continued RO water production 24/7.

WATER SOFTENER

Water Softeners shall protect the membranes by reducing hardness to <17.1ppm, preventing scaling that reduces membrane life, water quality, water volume production and equipment down time. Single units shall have an RO lock-out function to prevent the RO from operating until regeneration is complete. Twin alternating systems shall have a dilute brine hide-out preventer and switch from one tank to another providing continued RO water production 24/7.

OR

CHEMICAL FEED SYSTEMS

Chemical Feed Systems – injection of chemicals for anti-scaling and de-chlorination of the reverse osmosis feed water shall provide membrane protection.   

(SBS) Sodium Bi-Sulfate is a commercially available reducing agent used to de-chlorinate water supplied to the reverse osmosis system. This chemical shall be stored up to 6 months in a dry area. You will mix small batches less than 2% by weight to be used in 3-7 days. The dosing range is 1.8 to 3.0ppm of SBS per 1ppm of chlorine.

Your RO system shall be monitored by an ORP instrument with an alarm to signal for immediate maintenance action to prevent membrane failure or replacement.

Anti-scalants prevent precipitation of mineral salts that produce scale build-up on the RO membranes. This leads to reduced production, poor water quality and maintenance down time. Small batches shall be made and used in 7-10 days to prevent hydrolysis from the air, which dilutes the concentration. 3-5 ppm dosing rates.

ATMOSPHERIC STORAGE TANK

The reverse osmosis product water storage vessel shall be constructed of FRP or HDPE seamless construction, flat bottom design and a top manway for service access. A 0.2 – micron tank vent filter shall be top mounted at head of tank. Schedule 80 PVC bulkhead fittings shall be installed for high/low level switches, RO permeate inlet, RO permeate discharge and drain.

STORAGE TANK LEVEL CONTROLS

Two 3 wire float switches shall be adjustable and installed in the storage tank. One float shall signal the start and stop operation of the RO system. The second float installed in the lower section of the vessel shall provide re-pressurization pump protection during low tank levels.

RO RE-PRESSURIZATION PUMP

Single or alternating horizontal centrifugal pump engineered and pre-wired with motor starters shall be provided for product water distribution. Motor shall be rated for 3500 RPM, 460 VAC, three phase, 60 Hz. power supply and rated ODP. The pump shall be constructed of 316 stainless steel with inlet/outlet flanges. The pump shall be designed with axial suction port and radial discharge ports. The primary rotating seal and stationary seat shall be silicon carbide material and the secondary seal shall be a FKM (fluorocarbon rubber) material.

The pump skid shall include a control panel rated NEMA 4 and shall include an hour meter, hand/ off auto selector switch, low tank level alarm light and pump run light.

ULTRAVIOLET LIGHT

The ultraviolet light shall be constructed of 316 stainless steel with flanged connections. A minimum rated lamp wavelength of 254nm shall be provided for the reduction of water bacteria present in the RO storage tank and /or piping distribution. The lamp shall be housed in a quartz jacket with a rating of 9000 hours of operation. A control panel with a NEMA-3R shall include an elapsed hour meter and ballast power light.

POST FILTER

The vented and flanged filter housing shall be constructed of 316 stainless steel and a filter rating of 1.0 micron nominal.

CIP SYSTEM

The membrane clean-in-place shall be provided for periodic membrane maintenance to regain performance. Skid mounted and portable system shall be an available options. A high density polyethylene free standing tank with conical-bottom shall have and open top.

A 316 stainless steel centrifugal horizontal multi-stage pump shall recirculate the cleaning solution through the membranes. The pump shall be designed with axial suction port and radial discharge ports. The primary rotating seal and stationary seat shall be silicon carbide material and the secondary seal shall be a FKM (fluorocarbon rubber) material.

An inlet cartridge filter rated 100 psig and supplied with a nominal polypropylene 25 micron rated filter shall trap the contaminants.
The CIP complete system shall include a flow meter, isolation valves, transfer hoses, valves thermometer and tank heater. The tank heater shall have CSA, ATEX or IECEX certified enclosure made with Watrod or Firebar tubular elements brazed or welded to a flange. The thermostat shall be single pole, single throw (SPST) and double pole, or single throw (DPST). Voltage 240-480 VAC and watts from 150- one megawatt.
 
FIELD SERVICE, TRAINING, START-UP

Start-up, training and service shall be made available through a net-work of authorized service providers. Authorized service representatives shall have extensive knowledge and 10 years of field experience in the industrial water treatment industry. Technical support and parts shall be available from the manufacturer.

**Specifications subject to change without notice.

INSTRUCTIONS

Three (3) complete sets of installation, operation and maintenance manuals shall be provided.

GUARANTEES

All mechanical and electrical equipment is guaranteed for eighteen (18) months from date of shipment or one (1) year from date of service against any defects in workmanship or material. Any part proving defective shall be replaced or repaired within this period at manufacturer’s option. The manufacturer guarantees that under actual operating conditions the mineral shall not be washed out of the system during the service run or backwashing period; and that the turbidity and color of the effluent by reason of passing through the softener system, shall not be greater than the incoming water; and that the underdrain system, gravel and minerals shall not become fouled, either with turbidity or by dirt, rust or scale from the softening system while operating as noted in manufacturer’s instructions.

 

 

Specifications:         


Model

Capacity
(GPD)

Typical

Motor
HP

Connections (in.)
Feed
Product
Reject

Dimensions
 L x W x H (in.)

Ship
Wt. (lbs.)

LTF2-14400

12,540

5

1.5
1
1

135 x 38 x 70

870

LTF2-19200

16,700

7.5

1.5
1
1

135 x 38 x 70

950

LTF2-24000

20,900

7.5

1.5
1
1

135 x 38 x 70

1030

LTF2-28,800

25,000

10

1.5
1.5
1

135 x 38 x 70

1170

 

Model

Capacity
(GPD)

Typical

Motor
HP

Connections (in.)
Feed
Product
Reject

Dimensions
L x W x H (in.)

Ship Wt.
(lbs.)

LTF3 – 42,000

35,040

10

2
1.5
1

145 x 36 x 80

1940

LTF3 – 63,000

52,560

15

2
1.5
1

145 x 36 x 80

2490

LTF3 – 84,000

70,080

15

2
2
1.5

145 x 36 x 80

3095

LTF3 – 105,000

87,600

20

2.5
2
1.5

145 x 50 x 80

3440

LTF3 -126,000

105,100

25

2.5
2.5
1.5

145 x 50 x 80

3865

 

Model

Capacity
(GPD)

Typical

Motor 
HP

Connections (in.)  
Feed
Product
Reject

Dimensions
L x W x H (in.)

Ship Wt.
(lbs.)

LTF4 - 112,000

93,400

25

2.5
2
1.5

192 x 50 x 80

3905

LTF34 – 140,000

116,800

30

3
2.5
2.5

192 x 50 x 80

4260

LTF4 - 168,000

140,160

30

3
2.5
2.5

192 x 50 x 80

5000

LTF4 – 210,000

175,200

40

4
3
3

272 x 50 x 80

5800

LTF4 - 252,000

210,240

40

4
3
3

272 x 50 x 80

6300



 

 

 

 

Address: 7869 N. 73rd St. Milwaukee, WI 53223, Phone: 414.365.0787 Fax: 414.365.0248 Email: info@lakesidewater.com 

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