X-Flow-Compact-33-Helix

Summary

Product identification

The Pentair X-Flow Compact 33 Helix is an 8-inch ultrafiltration membrane element.

• Product Name: X-FLOW COMPACT 33 HELIX
• Membrane Type: Helix Ultrafiltration Membrane
• Article Code: 7821KQB99R

Applications

• Pre-treatment RO and NF
• Surface water
• Drinking and process water production
• Recovery of sandfilter backwash water
• Effluent treatment
• Membrane bioreactor
• Wastewater treatment
• Treatment of oil-in-water emulsions

Operating limits

• Max. feed pressure:
  • 800 kPa at 20 °C
  • 650 kPa at 30 °C
  • 550 kPa at 40 °C
  • 450 kPa at 50 °C
  • 380 kPa at 60 °C
• Max. permeate pressure: -100 ~ +250 kPa
• Max. transmembrane pressure (TMP): -50 ~ +250 kPa (negative TMP correlates with backwash pressure)
• Max. temperature: 60 °C

Membrane characteristics

The membrane is a hydrophilic tubular polyvinylidene fluoride membrane cast on a polyester carrier. It features a Helix structure on the membrane surface to enhance turbulence and reduce fouling.

• Structure: Asymmetric
• Mean pore size: 30 nm
• Purpose: Developed for use in large-scale processes for water purification.
• Performance: High performance and very good anti-fouling behavior.
• Cleaning: Membrane elements can be backflushed for efficient cleaning, resulting in higher average product flux.
  • Backwash water should be free of particulates and of permeate quality or better.
  • Backwash pumps should preferably be made of non-corroding materials (e.g., plastic or stainless steel).
  • If compressed air is used, do not allow a two-phase air/water mixture to enter the element.
• Temperature Sensitivity: Avoid sudden temperature changes (particularly decreases). Do not exceed 60 °C process temperature. Bring the module back to ambient operating temperature slowly (typical value 3 °C/min) to prevent irreparable damage.

Materials of Construction

• Housing: PVC-C, drinking water quality
• Potting: EP resin
• Membrane Material: Polyvinylidene fluoride
• Membrane Carrier: Composite polyester woven/non woven

Mechanical / hydraulic

• Hydraulic membrane diameter: 5.2 mm
• Membrane area: 33 m²
• Feed connection D0: 220.0 mm
• Module length L0: 3000 mm (±1)
• Saddle diameter D1: 240 mm
• Module diameter D2: 213 mm
• Permeate connection d0: 73.0 mm
• Permeate length I0: 165 mm (±1)
• Permeate position I1: 90 mm (±1)

Weight Specifications

• Dry weight of membrane element: ca. 45 kg [100 lbs]
• Membrane element filled with water: ca. 110 kg [242 lbs]

Process Characteristics (water, 20°C)

• Crossflow flow rate: 53.5 x v (m³/h), where v is superficial velocity in m/s.
• Pressure-drop across module (laminar flow): 1.3 x L0 x v (kPa), where L0 is module length in m.
• Pressure-drop across module (turbulent flow): 3.9 x L0 x v¹·⁷⁵ (kPa), where L0 is module length in m.

Cleaning chemical resistance

It is recommended to keep the pH between 1 and 11 and not to exceed a temperature of 40 °C during cleaning and/or disinfection.

• NaOCl (active chlorine): 500 ppm max.
• H₂O₂: 1000 ppm max.
• NaOH: pH ≤ 11
• Nitric acid: pH ≥ 1
• Phosphoric acid: pH ≥ 1
• EDTA: pH ≤ 11
• Citric acid
• Enzymatic compounds
• Sodium Hypochlorite (specific guidelines):
  • Typical 200 ppm, at ≤ 40 °C
  • Maximum 500 ppm
  • 250,000 ppm hours cumulative at 30 °C

General solvent resistance

The indications below are guidelines, as resistance depends on actual process conditions.

• Acids, pH >2: +
• Bases, pH <11: +
• Organic esters, ketones, ethers: --
• Aliphatic alcohols: ++
• Aliphatic hydrocarbons: ++
• Halogenated hydrocarbons: ++
• Aromatic hydrocarbons: +
• Polar organic solvents: --
• Oils: ++

Storage

• New membrane modules: Store as supplied in a dry, normally ventilated place, away from sources of heat, ignition, and direct sunlight. Store between 0 and 40 °C. Do not subject to freezing temperatures.
• After use: UF membranes must be stored wet at all times.
• Biological growth prevention:
  • Short-term shutdowns: A daily flush with permeate quality water containing up to 2.0 ppm free available chlorine for 30 to 60 minutes may be adequate.
  • Long-term storage: Membranes should be cleaned before disinfection. A 1% sodium metabisulfite solution can be used for disinfection.
• In either wet storage situation, modules should be stored hydraulically filled.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the original OEM PDF. Contractual data must match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet