Reverse Osmoses System Operating Profile
The system shall use reverse osmosis technology to reduce the total dissolved solids (TDS) level in water by a minimum of 95 percent. The system shall contain its own pressurization system to optimize the production of water through the membrane. System operating pressure shall be between 100 and 160 psi. The system shall include monitoring and a regulating device for adjusting the system pressure. The system shall contain an automatic inlet valve, which closes when the system is shut down. A low-pressure switch and flow switch shall be used to protect the pump from cavitation damage during low-pressure or low-flow occurrences. The system operation is based on a normally open dry contact (i.e. from a level control float) that is closed when the system is required to shut off.
Reverse Osmoses System Pump Design
Units will use a vertical multi-stage centrifugal pump. The pump wet end shall be constructed of 316 grade stainless steel. Motor will be rated to five horsepower, will be of a totally enclosed fan cooled design and operate on three-phase power. The pump will use five stages of impellers to boost pressure to between 100 and 160 psi.
Reverse Osmoses System Membranes and Housings
The system shall use thin film composite membranes in a spiral wound configuration with dimensions of 4” x 40”. A total of 8 membranes will be used to permeate 14,400 gpd of water, based on a 65o F operating temperature. Membrane construction will provide for low energy requirements by operating at a normal working pressure below 175 psi. Housings shall be of fiberglass construction and rated for a working pressure to 250 psi. Four housings shall be mounted in a horizontal configuration, each designed to contain two 4” x 40” membrane elements. A reject recovery configuration shall be used, with the primary housing’s reject line feeding a secondary housing’s inlet.
Reverse Osmoses System Plumbing Configuration
The system shall be rated for a maximum working pressure of 175 psi. Primary plumbing components shall be schedule 80 CPVC. The system includes an adjustable, internally recirculated flow. A regulating valve shall control reject flow. The recirculation, reject and permeate flow rates shall all be displayed on an operator’s interface panel, accessible at the front of the system. Feed pressure and pump pressure shall also be displayed. Recirculation valves shall be installed for easy access, and sampling ports are included on the permeate side of each membrane housing.
Reverse Osmoses System Elite System Controls
All system controls shall be automatic and controlled by a programmable logic controller. The system shall continuously display the inlet water quality and permeate water quality in microSiemens. The controller shall provide system alarms including low inlet pressure and poor permeate quality. During a shut down mode, the feed side of the membrane shall be flushed with at least five housing volumes of permeate water. All electronic components shall be contained within a NEMA 3R, non-metallic enclosure. System controls shall incorporate an emergency system stop and disconnect for main power. System shall provide fusing based on full load current.
Reverse Osmoses System Skid
System dimensions shall not exceed 36” x 60” x 108”. Units shall use an epoxy coated steel frame.
Reverse Osmoses System Components:
| Inlet Valve | 2″ CPVC Motorized Ball Valve |
| Pre-Filter | 5 micron Bag Filter |
| Pump | 316 SS, 5 Stage, Vertical |
| Motor | 5 HP TEFC Motor |
| Low Pressure Protection | Latching 12 psi switch |
| Housing Type | 2 Element, Fiberglass Wound |
| Membrane Type | Thin Film Composite |
| Membrane Dimensions | 4″ x 40″ |
| Number of Membranes | 8 |
| Square Footage of each Membrane | 85 ft2 |
| Array Configuration | 2/2 Reject Recovery |
| Internal Recirculation Loop | 1.5″ CPVC |
| Recirculation Control | 3/4″ PVC Globe Valve |
| Drain Control | 3/4″ PVC Globe Valve |
| Recirculation Flow Meter | 0-40 gpm Polysulfone Meter |
| Reject Flow Meter | 0-40 gpm Polysulfone Meter |
| Permeate Flow Meter | 0-40 gpm Polysulfone Meter |
| System Shut-Off Control | N.O. Level Switch |
| Inlet Quality Monitor | Digital, 0-2,000 microSiemens |
| Permeate Quality Monitor | Digital, 0-500 microSiemens |
| Controller | G.E. Micro PLC |
Reverse Osmoses System Connections:
| Power | 208/230/460 VAC, 3 Phase, 60 Hz |
| Full Load Current (60 Hz) | 18/16/8 Amps |
| Inlet Connection | 2″ CPVC Union |
| Permeate Connection | 1.5″ CPVC Union |
| Drain Connection | 1.5″ CPVC Union |
| EverCleanTM Rinse Connection | 3/4″ CPVC Union |
| Cleaning Skid Inlet (Optional) | 2″ CPVC Union |
| Cleaning Skid Return (Optional) | 1.5″ CPVC Union (2 connections) |
Reverse Osmoses System Feed:
| Pressure | 35-50 psi |
| Pressure (Static) | <100 psi |
| Temperature | 35 – 90oF |
| pH | 4-10 SU |
| Chlorine | < 0.05 mg/l as Cl2 |
| Hardness (Max.) | < 4 gpg as CaCO3 |
| Iron (Max.) | < 0.2 mg/l as Fe |
| Total Dissolved Solids (Max.) | < 2,500 mg/l as NaCl |
Reverse Osmoses System Specifications:
| Inlet Flow Rate @ 65% | 15.4 gpm |
| Permeate Flow Rate* | 10 gpm |
| Reject Flow Rate @ 65% | 5.4 gpm |
| Daily Production | 14,400 gpd |
| Operating Pressure Range | 100-160 psi |
| Normal Operating Pressure | 125 psi |
| High Pressure Shut-Off | 175 psi |
| Low Pressure Shut-Off | 12 psi |
| Low Flow Shut-Off | 8 gpm |
| Reject Rate | 92% – 98% |
| Recovery Ratio | 50 – 65% |
| EverCleanTM Rinse Time | 5 minutes |
| EverCleanTM Rinse Volume | 27 gallons |
| Width | 108″ |
| Depth | 36″ |
| Height | 60″ |
| Weight | 900 lbs. |
| Model Number | Part Number |
| TI 10e – 208/230 VAC, 60 Hz | S14110 |
| TI 10e – 460 VAC, 60 Hz | S14111 |
| TI 10e – 385/400/415 VAC, 50 Hz | S14112 |
* based on 65o F, 500 mg/l TDS feed water, no permeate backpressure