Protect your chemical storage tank system by ensuring your venting is set up properly. Here’s a look at our Do’s and Don’ts when it comes to venting.
1. Do Not Pipe Multiple Vents Into a Common Line
If a common line is used, contact Poly Processing to ensure proper vent size.
2. Do Not Reduce Vent Size or Vent Line
3. Keep 90 Degree Bends to a Minimum – 3 or Less Are Recommended
4. Keep Vent Lines Clear of Restrictions
Venting charts based on recommendation and criteria from Venting Design for ACFM Technical Paper.
|Mechanical Pump Fill||Pneumatic Fill|
|IF ≤ 1,000 gallons||IF – Vent length ≤ 3′||IF – Vent length > 3′ and ≤ 30′||IF – Scrubber application|
|✔ Vent size should equal size of largest fill or discharge fitting||✔ Maintain vent screen mesh size ≥ 1/4″ or no screen used||✔ 3 or less 90º elbows with no other restrictions or reduction in pipe size||✔ Vent pipe size throughout scrubber system CANNOT be reduced!|
|✔ Centerline of dispersion pipe not to be submersed > 6″|
|IF > 1,000 gallons||✔ Emergency Pressure Relief Cover Required IF > 1,000 gallons||✔ Emergency Pressure Relief Cover Required IF > 1,000 gallons||✔ Perforated dispersion pipe must be same diameter as vent or larger. Sum of perforations ≥ cross-sectional area of pipe|
|✔ Vent size should exceed the largest fill or discharge fitting by 1″|
|Tanker Discharge||Inlet/Fitting Size||Minimum Vent Size||Tanker Discharge||Inlet/Fitting Size||Minimum Vent Size||Tanker Discharge||Inlet/Fitting Size||Minimum Vent Size|