Pstat vs Vent Area
PstatStatic vent activation pressure · barg
⚙ Customize chart axes
X-axis · Pstat
Y-axis · Vent area (m²)
Axes control display only. A custom X range also recalculates the curve within valid input bounds.
Deflagration & Vessel Parameters
Metric UnitsSign in to manage your private plant list.
Database Key
Automatically populated from the selected standard dust preset.
m³
bar·m/s
Dust Explosion Class:
St 1
barg
barg
barg
panels
NFPA 68 Sec. 8.9
Factor
Used in fireball diameter formula: D = K · (V / n)¹/³. Defines external hazard envelope.
Dust analysis is highly sensitive to the input data and assumptions, so it is the user's responsibility to verify the results before official use
NFPA 68 Sec. 8.2.2.3 (for 2 < L/D ≤ 6)
Vent mass ≤ 40 kg/m²
L: Effective enclosure length associated with the maximum flame travel distance. Its determination depends on enclosure geometry and vent arrangement.
D: Effective hydraulic diameter of the enclosure cross-section perpendicular to the flame travel direction—not the explosion vent diameter.
barg; default 0 barg. Used in NFPA 68 L/D correction when L/D > 2. Ensure 1 + Pinitial > 0.
Pred must be strictly greater than Pstat.
NFPA 68 Fireball Envelope
1 explosion panelIllustrative arrangement
1 explosion panelIllustrative arrangement
1 explosion panelIllustrative arrangement · not to scale
1 explosion panelIllustrative arrangement · not to scale
1 explosion panelIllustrative arrangement · not to scale
Graphical representation note: The explosion relief panel location shown in the visualizer is for graphical representation purposes only and does not represent the actual or correct installation location on the equipment. Explosion relief panels should not be obstructed by internal filters or other equipment internals; actual vent location and arrangement shall be determined by the applicable design requirements and equipment configuration.
Relief Panel
Fireball Zone
Clean Plenum
Calculation unavailable — missing material properties
Enter verified values in the Dust Analysis inputs to enable calculations. If you do not know these values, use the Search GESTIS-DUST-EX button above to check the available data for your material. Confirm the suitability of the values for your application.
Total Vent Area (Av)
0.64
m²
6.89 ft²
Per Panel Area
0.32
m²
3.45 ft²
Square Panel Dim.
566
mm
22.3 × 22.3 in
Fireball Dia (D)
Sec 8.9
13.7
m
44.9 ft (R: 6.8 m)
Relief Ratio (Av / V):
0.064 m⁻¹
Dust Explosion Class:
St 1 (Kst ≤ 200)
Commercial Vent Selection & Engineering Notes
Select a manufacturer to filter commercial vent sizes.
Run the dust analysis to identify a preliminary commercial vent panel candidate.
| Commercial Size | Nominal Area | Panels Required | Total Area Provided | Relief Coverage |
|---|
NFPA 68 Engineering Design Guidelines for Dust Collectors:
- Vessel Strength: Ensure dust collector vessel design strength (Pes) safely exceeds reduced explosion pressure (Pred) with appropriate safety factor (typically Pred ≤ 2/3 Pes for low-strength vessels).
- Vent Placement: Position explosion panels directly on the dirty air section/hopper volume per NFPA 68 Section 8.8, venting away from personnel access walkways.
- Fireball Safe Exclusion Zone: Per NFPA 68 Section 8.9, the vented flame length and width D = K·(V/n)¹/³ represents the fireball envelopment zone. Clear personnel walkways and combustible materials within this distance.
- Panel Mass: Keep vent panel surface weight ≤ 40 kg/m² (≤ 8 lb/ft²) to avoid deflagration venting area increase corrections.
Engineering intelligence · parametric analysis
Engineering Sensitivity Analysis
One-variable-at-a-time analysis using the currently selected sizing equation, coefficients, L/D correction and vessel inputs.
Current required area
— m²
Current Pmax
— barg
Current Pred
— barg
Current Pstat
— barg
Current L/D
— ratio
Current vent panels
— panels
Current fireball diameter
— m
Pred vs Vent Area
PredReduced explosion pressure · barg
⚙ Customize chart axes
X-axis · Pred
Y-axis · Vent area (m²)
Axes control display only. A custom X range also recalculates the curve within valid input bounds.
Number of Vent Panels vs Fireball Distance
NCalculated fireball diameter (D) · metres
⚙ Customize chart axes
X-axis · Number of panels
Y-axis · Fireball diameter (m)
Whole-number panel counts from 1 to 16. Distance follows the active fireball equation.
Engineering interpretation: Charts use ±20% around the current baseline for pressure sensitivity (within the input limits). Panel-count chart shows discrete whole-number values from 1 to 16. Colored lines show the equation response while all other inputs remain fixed. Dashed markers show the current operating/design input. Only numerically valid sampled points are plotted; gaps are intentional. For EN 14491, results outside the displayed applicability advisory remain visible for comparison but are not validated design values. These are sensitivity studies, not approval to increase Pred, change panel Pstat, or extrapolate beyond a standard's applicability. Verify vessel strength, panel certification, vent geometry, and standard limits independently.
Mathematical Substitution Trace
NFPA 68 Standard
NFPA 68 — Vent Area EquationActive NFPA model
A_v0 = C₁ · (1 + C₂ · Pstat^e₁) · Kst · V^e₂ · ((Pmax / Pred) − 1)^e₃
For 2 < L/D ≤ 6: A_v1 = A_v0 × [1 + 0.6 × (L/D − 2)^0.75 × exp(−0.95 × (Pred/(1 + Pinitial))²)]. For L/D ≤ 2, A_v1 = A_v0.
Default parameters used by this calculator: C₁ = 1.1×10⁻⁴, C₂ = 1.54, e₁ = 1.33, e₂ = 0.75, e₃ = 0.50.
EN 14491 — Vent Area EquationActive EN model
A = B · (1 + C · log₁₀(L/D))
B = [a·Pmax·Kst·Pred^b + c·(Pstat−d)·Pred^e] · V^f
C = g·log₁₀(Pred) + h
B = [a·Pmax·Kst·Pred^b + c·(Pstat−d)·Pred^e] · V^f
C = g·log₁₀(Pred) + h
Default parameters used by this calculator: a=3.264×10⁻⁵, b=−0.569, c=0.27, d=0.1, e=−0.5, f=0.753, g=−4.305, h=0.758. New EN cases use L/D = 1.0 by default.
1. Vent Area Equation (Base Vent Area A_v0):
NFPA 68 Eq. 8.2.2
A_v0 = 1.1 × 10⁻⁴ · (1 + 1.54 · Pstat¹·³³) · Kst · V⁰·⁷⁵ · √((Pmax / Pred) - 1)
1. Pstat term: 1 + 1.54 · (0.10)¹·³³ = 1.0720
2. Volume term: V⁰·⁷⁵ = (10.0)⁰·⁷⁵ = 5.6234 m²·²⁵
3. Press. ratio term: √((8.5 / 0.20) - 1) = 6.4420
4. Av Total = 1.1×10⁻⁴ × 1.0720 × 150 × 5.6234 × 6.4420 = 0.641 m² (2 panels @ 0.320 m² each)
2. Fireball Hazard Envelope Dimension:
Radial Standoff Distance
D = K · (V / n)¹/³
1. Enclosure Volume per Vent (V / N): 10.0 / 2 = 5.000 m³
2. Cubic root term: (5.000)¹/³ = 1.710 m
3. Fireball Diameter D = 8.0 × 1.710 = 13.68 m (44.9 ft) • Radial Standoff R = 6.84 m
Commercial Explosion Vent Sizes
Last Modified Date & Time: Loading...
| Manufacturer | Product / Series | Nominal Vent Size (mm) | Effective / Relief Area (cm²) | Action |
|---|
Use current manufacturer documentation for final engineering selection. Rows without a published effective/relief area remain visible but are not used to calculate panels required.
Explosion Vent Manufacturers List
Last Modified Date & Time: Loading...
| Manufacturer | Product | Official Source | Notes | Action |
|---|
Manufacturer information is provided as a reference list. Verify current product specifications and availability with the manufacturer before engineering use.
Dust Materials List
Admin access requiredLast Modified Date & Time: Loading...
Adjust each column width. All columns automatically share the available table width.
Widths are saved in this browser for your account. Long values may be shortened visually; select a field to read or edit its full value.
| No. | Dust Name | Median Particle Size (micro meter) | Kst (bar.m/s) | Pmax (barg) | K | Layer or cloud ignition temperature (°C) | Minimum Ignition Energy (mJ) | Reference | Action |
|---|
Units: Kst (bar·m/s), Pmax (barg), K (dimensionless), ignition temperature (°C). Missing values remain blank. Verify material test conditions before engineering use.
Analysis Dashboard
Analysis of your saved Dust Analysis calculations only
No saved calculations match these filters. Save a calculation or adjust the filters.
Number of Plants
0
Number of Equipment
0
Equipment by Type
Equipment ID vs Kst (bar·m/s)
Equipment ID vs Pmax (barg)
Equipment ID vs Number of Panels
Equipment ID vs Area per Panel (m²)
Equipment ID vs Fireball DIA (m)
Charts reflect saved records for the signed-in account. Equipment counts use unique Equipment IDs; if an ID has multiple saved cases, its latest case is shown. Records without Plant or Equipment Type are categorized as Not recorded.
Total Logged Records
0
Stored in your PS ONE account
Max Vent Area Recorded
0.00
m²
Peak relief required
Max Fireball Dia (D)
0.0
m
Max hazard envelope
Total Number of Panels
0
Sum across saved calculations
My Saved Dust Analysis Calculations
Click 'Load' to populate any saved record directly back into the live calculator
| Plant | Equipment Type | Equipment ID | Calculation Method | Kst (bar·m/s) | Pmax (barg) | No. of Panels | Area per Panel (m²) | Fireball DIA (m) | Dust Name | Load |
|---|
No Calculation Records Logged Yet
Click the button below or use "Save to My Account" in the calculator view to save and catalog equipment sizing runs.