XULP Series Ultra Low Pressure RO Membrane Element High Flux Salt Rejection Water Treatment

Product Details

Detail Information — Model Performance

Permeate flow of a single element may vary within ±20% of the nominal value. Exact figures follow the model-specific datasheet supplied with each order.

Standard Test Conditions

Operating Limits

Dimensions & Weight

High Light

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Material & Construction

The performance and service life of a reverse osmosis membrane element are determined by the quality of every layer. The XULP RO membrane element combines a polyamide composite membrane sheet, polypropylene spacers, a perforated central permeate tube, ABS anti-telescoping end caps and a filament-wound fibreglass outer shell. All wetted materials are NSF compliant and selected for low extractables and long term pressure resistance.

1. Outer shell — FRPFilament-wound glass fibre reinforced epoxy shell with a fine diagonal winding texture. It holds the spiral wound membrane leaves in shape against feed pressure and prevents telescoping under high flow.

2. Membrane leaves & spacersAlternating polyamide TFC membrane sheets, diamond-pattern polypropylene feed spacer and polyester permeate spacer, glued on three edges and wound around the central tube in a multi-leaf configuration.

3. End caps, tube & sealsABS anti-telescoping device with radial spokes, perforated ABS/PVC central permeate tube, EPDM O-rings and a brine seal ring that prevents feed-to-concentrate bypass.

Material Specification Summary

Material Specification Summary

Product Description

Product Introduction

The XULP series ultra low pressure RO membrane element is a spiral wound aromatic polyamide thin-film composite reverse osmosis membrane developed for desalination of surface water, ground water, tap water and municipal water with TDS up to 2000 ppm. Compared with a conventional low pressure RO membrane, it delivers the same high permeate flow and high salt rejection at roughly two thirds of the operating pressure, so the high pressure pump, piping and pressure vessels can all be specified at a lower rating. The result is lower energy consumption, lower equipment investment and lower total operating cost for the whole water treatment membrane system.

As a standard 8-inch or 4-inch RO membrane element, the XULP cartridge is a drop-in replacement that fits all standard pressure vessels and interconnectors. It is widely used in pure water plants, boiler feed water, food and beverage processing, pharmaceutical water, electronics ultrapure water pre-treatment and commercial drinking water systems. Every reverse osmosis element is factory wet-tested, preserved in 1.0% sodium bisulfite solution and vacuum packed before shipment.

Working Principle

1. Pressurised feed: Pre-treated feed water enters the feed end of the element and flows axially through the polypropylene feed spacer channels across the membrane surface.
2. Selective separation: The ultra-thin polyamide active layer (about 0.1 - 0.2 µm) lets water molecules pass while rejecting dissolved salts, ions, organics, colloids and microorganisms; the porous polysulfone support and non-woven backing carry the pressure load.
3. Permeate collection: Purified water spirals through the permeate spacer inside each glued membrane envelope into the perforated central permeate tube, then exits as product water.
4. Concentrate discharge: Rejected salts and contaminants leave from the concentrate end with the brine stream; the brine seal ring prevents feed water from bypassing the membrane leaves.

Features of the XULP High Flux RO Membrane

• Ultra low operating pressure — approx. 2/3 that of a conventional low pressure RO membrane at equal flux, cutting high pressure pump energy by up to 30%.
• High flux with stable salt rejection of 99.0 - 99.5% (minimum 98.5%), producing consistent permeate quality even with fluctuating feed TDS.
• Large active membrane area of 400 ft² (37 m²) in the 8040 format, up to 13,200 GPD per element, reducing the number of elements and pressure vessels required.
• Multi-leaf spiral wound design shortens the permeate path, lowers back pressure loss and gives more uniform flow distribution across the membrane surface.
• Hydrophilic, fouling resistant membrane surface with excellent removal of TOC, silica and fluoride ions; extended cleaning intervals and longer service life.
• Wide pH tolerance: 3 - 10 during continuous operation and 2 - 12 during chemical cleaning, allowing flexible CIP procedures for organic, biological and inorganic scale fouling.
• Lower pressure rating requirement for pumps, pipes, valves and pressure vessels reduces both capital investment and maintenance cost of new RO systems.
• Standard 8040 / 4040 dimensions with universal interconnectors and brine seal — direct replacement without modifying existing housings.

Applications

• Purified water and bottled drinking water production, commercial water dispensers and community water stations
• Boiler feed water and power plant make-up water, low pressure boiler demineralisation
• Food and beverage processing, dairy, juice, sugar and brewing process water
• Pharmaceutical water, medical device rinsing and cosmetic production water
• Electronics and semiconductor ultrapure water pre-treatment, EDI feed water
• Surface water, ground water and municipal tap water desalination and TDS reduction
• RO pre-treatment, water reuse, grey water reclamation and industrial process water
• General industrial water treatment membrane systems, laboratory and small commercial RO units

Packaging & Shipping

Every xulp membrane element is factory wet-tested, flushed and preserved in 1.0% food grade sodium bisulfite solution (with 10% propylene glycol antifreeze in winter), then vacuum sealed in a heavy duty oxygen barrier bag. Each sealed element is placed in an individual export carton with shock absorbing end pads; cartons are stacked on a fumigation-free plywood pallet and stretch wrapped for sea freight. Model number, serial number and flow direction are marked on the carton, and a test report, handling instruction and installation manual are supplied with each order. Keep the element sealed until installation, store between 5 and 35 °C away from direct sunlight and protect from freezing.