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Sáu cách thức đơn giản vận chuyển chất lỏng

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Sáu cách thức đơn giản vận chuyển chất lỏng0 out of 50 based on 0 voters.


To pump viscous fluids 
- Choose tubing at least two sizes larger than the flow size required.
- Keep motor speed <300 rpm; the slower the motor, the better the flow.
- Use adjustable occlusion pumps: 
 Over-occlude to prime pump;
 reduce occlusion for longer life.

To increase tubing life 

- Run larger tube sizes at slower speeds.
- Reduce occlusion.
- Select longer-life material.
- Reduce pressure in system.
- Stop pump periodically, move tubing 20-25 cm (8-10 in) forward.

To reduce pulsation 
- Use pulse dampener.
- Use adjustable occlusion pump.
- Reduce occlusion and apply back pressure.
- Use dual heads with offset rollers.
- Add extra discharge tubing to system.
- Run smaller tube sizes at higher speeds. 

To pump abrasive fluids 
- Keep soft particle sizes <25% of tube ID.
- Keep hard particle sizes <5% of tube ID.
- Keep motor speed <300 rpm.
- Use adjustable occlusion pumps:

To check tubing compatibility 
- See chemical compatibility charts 
- Always pretest unknown chemicals
- Immersion test recommended:
  1. Cut samples of tubing.
  2. Weigh and measure length and diameter. 
  3. Immerse for 48 hours in a closed vessel.
  4. Examine tubing for swelling, brittleness, cracking, softness, and other forms of deterioration.
  5. Weigh and measure length and diameter.
- If tubing does not change, try it in your pump.

Tubing selection hints 
- Longest life: NORPRENE®/PHARMED BIOPHARM PLUS Silicone
- Best clarity: BIOPHARM/ TYGON®/Silicone
- USP Class VI: PHARMED®/ Silicone/ C-FLEX®/TYGON LFL
- High purity: Silicone (platinum cured)
- Pressure/vacuum: NORPRENE/TYGON/PHARMED

Reference source: http://www.coleparmer.com/TechLibraryArticle/490