Inputs
Flow & Drain Inputs
Geometry & Checks
Actions
Sizing equation (US basis):
d²·L′ = K · (Qw + 0.356·Ad·Rw + Qwd)
d in inches, L′ in ft, Q in BWPD, Ad in ft², Rw in in/hr. Rain term 0.356·Ad·Rw converts deck rainfall into BWPD basis.
d²·L′ = K · (Qw + 0.356·Ad·Rw + Qwd)
d in inches, L′ in ft, Q in BWPD, Ad in ft², Rw in in/hr. Rain term 0.356·Ad·Rw converts deck rainfall into BWPD basis.
Results
Total Load Term (Qw + 0.356·Ad·Rw + Qwd):
-
Required d²·L′:
-
Baffled Section Length, L′:
-
Submerged Length, Ls:
-
Skim Section Length (min):
-
Estimated Total Caisson Length:
-
Screening Status:
-
Visualization
Notes
• Preliminary sizing only; confirm with your project specifications and vendor data.
• Checks performed: Ls ≤ sea water depth; skim section ≥ specified minimum (user input).
• Preliminary sizing only; confirm with your project specifications and vendor data.
• Checks performed: Ls ≤ sea water depth; skim section ≥ specified minimum (user input).
Technical Notes
Variable definitions
• Qw: Produced water to caisson (BWPD or m³/d).
• Qwd: Washdown/utility water to caisson (BWPD or m³/d).
• Ad: Deck drainage area contributing to caisson (ft² or m²).
• Rw: Rainfall intensity (in/hr or mm/hr).
• K: Method constant (dimensionless correlation constant, sheet/project-specific).
• d: Caisson internal diameter (in; custom entry can be mm when SI selected).
• L′: Required baffled section length from correlation (ft).
• Allowance: Additional submergence allowance added to L′ (ft).
• Ls: Submerged length = L′ + allowance (ft).
• Skim section: Minimum skim length requirement (m).
Formulas / logic
The tool applies the commonly used preliminary sizing correlation (US-basis):
d²·L′ = K · (Qw + 0.356·Ad·Rw + Qwd)
Where 0.356·Ad·Rw converts rainfall over deck area into an equivalent BWPD load (US units: ft² and in/hr).
Steps:
1) Compute load term: Load = Qw + 0.356·Ad·Rw + Qwd (BWPD).
2) Compute required d²·L′ = K·Load (in²·ft).
3) Compute L′ = (K·Load)/d² (ft).
4) Compute submerged length Ls = L′ + allowance (ft), where allowance is selected per basis: Literature (15 ft), Project (dip + exit allowance), or Custom.
5) Screening checks: (a) Ls ≤ Sea Water Depth, (b) skim section ≥ specified minimum.
Assumptions / notes
• This is a screening / preliminary sizing tool based on a correlation; confirm final design with project specifications, company standards, hydraulics, and vendor design.
• Correlation is implemented in its US-unit basis. When SI is selected, the tool converts inputs to US for calculation and displays results in SI.
• Rainfall term assumes uniform rainfall over the specified area and that all runoff reports to the caisson (no losses). Apply project runoff factors if required.
• K is project/sheet-dependent; keep default only if it matches your governing sizing basis.
• Any additional requirements (inlet/outlet arrangements, baffles, venting, corrosion allowance, marine growth, installation tolerances) must be handled in detailed design.
• Qw: Produced water to caisson (BWPD or m³/d).
• Qwd: Washdown/utility water to caisson (BWPD or m³/d).
• Ad: Deck drainage area contributing to caisson (ft² or m²).
• Rw: Rainfall intensity (in/hr or mm/hr).
• K: Method constant (dimensionless correlation constant, sheet/project-specific).
• d: Caisson internal diameter (in; custom entry can be mm when SI selected).
• L′: Required baffled section length from correlation (ft).
• Allowance: Additional submergence allowance added to L′ (ft).
• Ls: Submerged length = L′ + allowance (ft).
• Skim section: Minimum skim length requirement (m).
Formulas / logic
The tool applies the commonly used preliminary sizing correlation (US-basis):
d²·L′ = K · (Qw + 0.356·Ad·Rw + Qwd)
Where 0.356·Ad·Rw converts rainfall over deck area into an equivalent BWPD load (US units: ft² and in/hr).
Steps:
1) Compute load term: Load = Qw + 0.356·Ad·Rw + Qwd (BWPD).
2) Compute required d²·L′ = K·Load (in²·ft).
3) Compute L′ = (K·Load)/d² (ft).
4) Compute submerged length Ls = L′ + allowance (ft), where allowance is selected per basis: Literature (15 ft), Project (dip + exit allowance), or Custom.
5) Screening checks: (a) Ls ≤ Sea Water Depth, (b) skim section ≥ specified minimum.
Assumptions / notes
• This is a screening / preliminary sizing tool based on a correlation; confirm final design with project specifications, company standards, hydraulics, and vendor design.
• Correlation is implemented in its US-unit basis. When SI is selected, the tool converts inputs to US for calculation and displays results in SI.
• Rainfall term assumes uniform rainfall over the specified area and that all runoff reports to the caisson (no losses). Apply project runoff factors if required.
• K is project/sheet-dependent; keep default only if it matches your governing sizing basis.
• Any additional requirements (inlet/outlet arrangements, baffles, venting, corrosion allowance, marine growth, installation tolerances) must be handled in detailed design.