WFIWP fibre pre-filters for dust up to 14 bar
The WFIWP fibre pre-filter has a pleated element of acrylic fibres and cellulose and traps solid particles and dust larger than 3 µm — solid particle class 6 according to ISO 8573-1. The housing is made of stainless steel 1.4404.
The WFIWP filter comes in 11 sizes (pipe ø 17.2 to 88.9 mm) with flows of 1,250 to 60,000 l/min at 7 bar; working pressure up to 14 bar. It is one of the stages of the WFIW filters — the housing is the same for all stages, only the element differs.
WFIWP filters by size
The size determines the connection and the flow. Each size has its own PF range spare element.
| WFIWP filters and spare elements by size | ||||||
|---|---|---|---|---|---|---|
| Filter | Connection | l/min at 7 bar | Nm³/h at 7 bar | Height A × diameter C | Weight | Spare element |
| WFIWP-005 | welding end ø 17.2 mm | 1,250 | 75 | 202 × 76.1 mm | 1.8 kg | PFP-005V |
| WFIWP-010 | welding end ø 21.3 mm | 2,500 | 150 | 240 × 76.1 mm | 2 kg | PFP-010V |
| WFIWP-018 | welding end ø 26.9 mm | 3,750 | 225 | 254 × 76.1 mm | 2 kg | PFP-018V |
| WFIWP-030 | welding end ø 33.7 mm | 5,250 | 315 | 280 × 88.9 mm | 3 kg | PFP-030V |
| WFIWP-047 | welding end ø 42.4 mm | 7,000 | 420 | 337 × 88.9 mm | 3 kg | PFP-047V |
| WFIWP-070 | welding end ø 48.3 mm | 10,000 | 600 | 376 × 114.3 mm | 4.3 kg | PFP-070V |
| WFIWP-094 | welding end ø 60.3 mm | 15,000 | 900 | 457 × 114.3 mm | 4.8 kg | PFP-094V |
| WFIWP-150 | welding end ø 60.3 mm | 21,000 | 1,260 | 583 × 114.3 mm | 5.3 kg | PFP-150V |
| WFIWP-175 | welding end ø 76.1 mm | 28,000 | 1,680 | 740 × 139.7 mm | 9 kg | PFP-175V |
| WFIWP-200 | welding end ø 88.9 mm | 40,000 | 2,400 | 1,004 × 139.7 mm | 10.8 kg | PFP-200V |
| WFIWP-240 | welding end ø 88.9 mm | 60,000 | 3,600 | 1,029 × 168.3 mm | 16.2 kg | PFP-240V |
The flows apply to a pressure of 7 bar and a temperature of +20 °C. Dimensions according to the manufacturer’s technical data sheet; you will find further data on the product page of each filter.
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When to use it
The fibre pre-filter P is suitable where the air contains dust and finer contaminants that a stainless steel mesh lets through. The element only withstands +65 °C — for warmer air, there are meshes and sintered elements up to +150 °C.
The manufacturer does not state an oil class for it; oil aerosol is handled by the fine pre-filter M.
Where to place it
After the WFIWN5 basic filter or the WFIWI20 sintered pre-filter, before the WFIWR dust filter or the WFIWM fine pre-filter.
Flow by pressure
The catalogue flows apply to a pressure of 7 bar and a temperature of +20 °C. At a different pressure, they are multiplied by the correction factor: 1.88 at 14 bar.
| WFIWP filter flow in l/min by pressure | ||||
|---|---|---|---|---|
| Size (connection) | 4 bar | 7 bar | 10 bar | 14 bar |
| 005 (welding end ø 17.2 mm) | 788 | 1,250 | 1,725 | 2,350 |
| 010 (welding end ø 21.3 mm) | 1,575 | 2,500 | 3,450 | 4,700 |
| 018 (welding end ø 26.9 mm) | 2,363 | 3,750 | 5,175 | 7,050 |
| 030 (welding end ø 33.7 mm) | 3,308 | 5,250 | 7,245 | 9,870 |
| 047 (welding end ø 42.4 mm) | 4,410 | 7,000 | 9,660 | 13,160 |
| 070 (welding end ø 48.3 mm) | 6,300 | 10,000 | 13,800 | 18,800 |
| 094 (welding end ø 60.3 mm) | 9,450 | 15,000 | 20,700 | 28,200 |
| 150 (welding end ø 60.3 mm) | 13,230 | 21,000 | 28,980 | 39,480 |
| 175 (welding end ø 76.1 mm) | 17,640 | 28,000 | 38,640 | 52,640 |
| 200 (welding end ø 88.9 mm) | 25,200 | 40,000 | 55,200 | 75,200 |
| 240 (welding end ø 88.9 mm) | 37,800 | 60,000 | 82,800 | 112,800 |
Element, condensate drainage and maintenance
A PF range element is fitted in the housing — for example, the PFP-010V for the WFIWP-010. The same element also fits the PFP-010, HPFP-010, WFITP-010, WFIFP-010 and WHFITP-010. Element working temperature +1.5 to +65 °C.
The filter is supplied with an element, without a condensate drain. For WFIW filters, the manufacturer offers the AOK20SS stainless steel float drain up to 20 bar and +65 °C and, for the head, the MDHI 50-K differential pressure gauge. The drain outlet in the bottom has a G 1/2" thread.
Replace the element at least once every 12 months. Once a year, also check the housing for visible damage.
Accessories for WFIWP filters
MDHI 50-K gauge
Differential pressure gauge with connecting tubes; it shows how clogged the element is.
The same stage in other ranges
Stage P also comes in the PFP filters up to 14 bar, HPFP filters up to 50 bar, WFITP filters up to 14 bar, WFIFP filters up to 14 bar and WHFITP filters up to 50 bar. The elements are the same for all ranges.
Ventilek’s tip
Fibres only up to +65 °C. The fibre element P is suitable for cooler air. For warmer air, choose the N5 mesh or a sintered pre-filter — they withstand +150 °C.
- What filtration rating does the WFIWP fibre pre-filter have?
- The element traps particles larger than 3 µm, solid particle class 6 according to ISO 8573-1.
- What temperature does it withstand?
- The element from +1.5 to +65 °C.
- When should the element be replaced?
- At least once every 12 months.
Product sorting
List of products
With a ø 17.2 mm pipe connection and a flow of 1,250 l/min at 7 bar, the WFIWP-005 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 21.3 mm pipe connection and a flow of 2,500 l/min at 7 bar, the WFIWP-010 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 26.9 mm pipe connection and a flow of 3,750 l/min at 7 bar, the WFIWP-018 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 33.7 mm pipe connection and a flow of 5,250 l/min at 7 bar, the WFIWP-030 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 42.4 mm pipe connection and a flow of 7,000 l/min at 7 bar, the WFIWP-047 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 48.3 mm pipe connection and a flow of 10,000 l/min at 7 bar, the WFIWP-070 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 60.3 mm pipe connection and a flow of 15,000 l/min at 7 bar, the WFIWP-094 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 60.3 mm pipe connection and a flow of 21,000 l/min at 7 bar, the WFIWP-150 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 76.1 mm pipe connection and a flow of 28,000 l/min at 7 bar, the WFIWP-175 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 88.9 mm pipe connection and a flow of 40,000 l/min at 7 bar, the WFIWP-200 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...
With a ø 88.9 mm pipe connection and a flow of 60,000 l/min at 7 bar, the WFIWP-240 fibre pre-filter traps solid particles and dust larger than 3 µm, solid particle class 6...