JOWA F-2
Re-hardening filter para sa desalinated water
The JOWA F-2 re-hardening filter removes solid particles from evaporator water and raises its pH to 7.0–8.5 to limit corrosion of pipes, heat exchangers and tanks. A stainless steel (AISI 316L) vessel is filled with filter sand and pH-adjusting material between top and bottom strainers; two three-way valves switch between service and back-flushing. The manual covers installation between evaporator and fresh water tanks, filling, start-up, back-flushing, shut-off, safety, spare parts for all sizes and the type approval.
Mga maintenance procedure
Back-flushing the filter
- Turn both three-way valve handles upwards to reverse the flow. p. 5
- Flush for about 10 minutes or until fairly clear water comes out of the flushing outlet. p. 5
- Turn both handles back downwards for service. p. 5
First filling and start-up
- Fill sand through the upper manhole to about 10 cm above the bottom strainer, then pH material to about 15 cm below the top strainer. p. 3
- Fill with water through the inlet and back-flush until clear water comes out of the outlet. p. 5
- Set both handles downwards; the filter is in service. p. 5
Mga maintenance interval
| Item | Kailan | Gagawin | Manual |
|---|---|---|---|
| Back-flushing | once or twice a week depending on contamination | Flush about 10 minutes until clear | p. 5 |
| pH value | regularly | Check pH; top up pH material through the upper manhole as it is consumed | p. 5 |
Technical specifications
| pH after filter | 7.0–8.5 (approval: 6.5–8.5) | p. 3 |
|---|---|---|
| Vessel material | stainless steel SIS 2353 (AISI 316L) | p. 3 |
| Back pressure | at least 0.2 bar to prevent self-draining | p. 3 |
| Filling | sand about 10 cm over the bottom strainer, then pH material to about 15 cm below the top strainer | p. 3 |
| Sizes | F-75-2, 150-2, 300-2, 500-2, 750-2, 1500-2, 2000-2 | p. 26 |
Pinagmulan: manual ng gumawa na “EM-27 RE-HARDENING FILTER”, 26 pahina. Ang numero ng pahina ay ayon sa orihinal. Suriin ang manual sa barko bago magtrabaho.
Awtomatikong isinalin ang pahinang ito. Ang part number, code at pahina ay ayon sa orihinal.