40 inch low pressure drop polypropylene (PP) yarn pure string wound filter Ultra PP filter cartridge is a depth filter made by tightly winding polypropylene yarn around a central PP (polypropylene) core. The low pressure drop winding structure forms progressively tighter internal layers that trap particles throughout the media — providing high dirt-holding capacity and excellent sediment removal performance, designed to protect downstream equipment by efficiently removing particulate contamination from process fluids
Yarn (spiral) filters are low pressure drop wound string wound Purewound Ultra PP filters are commonly used in water filtration systems ? and can be suitable for applications involving pulsed water flow, especially as pre-filters to remove sediment and particulates before finer filtration stages.
Typical string wound filter Application Include:
- Sediment removal in watPure Wound filter treatment and industrial filtration
- Pre-filtration for RO systems
- Protection of sensitive equipment (e.g., pumps, compressors)
- Chemical, food & beverage, and industrial liquid filtration
- Industrial liquid filtration (water, oil, coolants)
- Pre-filtration protect downstream high-precision filters
- Chemical processing
- Boiler feed, cooling towers
Where can I get Quality low pressure drop polypropylene Sting wound filter cartridge ?
K Filter PureWound Polypropylene filter cartridges are high quality filter and wide array cartridges in GCC last 12 years/
PureWound PP Yarn filter Specification
| Parameters | Typical Value |
| Filter media | FDA approved Polypropylene (PP) yarn |
| Length | 40 inch (1016mm) |
| Micron Rating | 1 µm – 100 µm (customizable) |
| Outer Diameter (OD) | ~60 – 62 mm standard (Jumbo 110 – 115 mm available) |
| Inner Diameter (ID) | ~28 – 30 mm |
| End Connections | DOE, 222/226/Fin/Flat (varies) |
| Operating Temp. | up to ~60-100 °C depending on core & construction |
| Max Pressure | Approx. 2 – 4 kgf/cm² (varies by design) |
| Inner core | Polypropylene (PP)/ Stainless Steel 316.304 |
Key Features 40 inch Purewound filter
True depth filtration — loose outer layers with tighter inner layers for increased dirt holding
Broad chemical compatibility — PP is inert and resists many acids, bases, and solvents
Low pressure drop — efficient flow characteristics help maintain system performance
Customizable micron ratings — from ultra-fine (~1 µm) to coarse (~100 µm)
Delivery- fast delivery
How to select right wounded PP filter
Choose micron rating based on required cleanliness level (lower micron ⇒ finer filtration
Confirm housing compatibility (OD, ID, and end cap style)
For higher temperature or aggressive fluids, consider a stainless-steel core option
Suitability for Pulsed or Dynamic Water Filtration
In pulsing water applications (e.g., systems where flow fluctuates with pressure changes or cyclical backwashing/pulsing)
Robust Depth Filtration: Spiral wound yarn filters can tolerate variable flow because the depth structure spreads contaminants through the media rather than at a single surface, reducing clogging from flow spikes
Good Structural Strength: The wound design is mechanically strong and handles differential pressure changes well, which is beneficial in pulsed or transient flow situations.
Pre-Filtration Stage: They are often used as a first stage filter upstream of finer filters (e.g., micro-filtration, RO membranes) in both continuous and pulsed systems
Why string wound filter Work Well in Oil & Gas
True depth filtration
The spiral-wound construction creates a graded-density structure that captures contaminants throughout the media, not just on the surface.
String wound filter have high dirt-holding capacity
Ideal for upstream filtration where solids loading can be high (rust, sand, scale, carbon fines)
Excellent mechanical strength of string wound filter
Withstands pressure fluctuations and variable flow conditions common in oil & gas operations.
Typical Oil & Gas Applications
- Crude oil pre-filtration
- Produced water treatment
- Injection water systems
- Fuel and lube oil filtration
- Compressor and pump protection
- Pipeline and terminal filtration systems
Disadvantage PureWound yarn wound filter cartridge
PureWound yarn wound filters are not typically true “self-cleaning” or auto-backwashing elements like specialized spiral or screen filters with built-in cleaning mechanisms. For automated pulsing or wash-back systems, dedicated self-cleaning units or media designed for repeated flushing are more appropriate.
Conclusion
40-inch yarn spiral wound filters are suitable as rugged, high dirt-holding pre-filters in water filtration systems that experience pulsed or fluctuating water flow, as long as they are integrated into a system with appropriate housings and downstream cleaning or finer filtration stages.
PureWound low pressure filter are manufacturing in Qatar.
