Firewater Demand
Untitled firewater project REFERENCE EXAMPLESImport from plot plan & equipment datasheets DOCUMENT EXTRACTION
Upload readable PDF files. Tags are matched across the plot plan and datasheets; explicit dimensions are converted to metres. Review the results before adding equipment. Scanned pages, unlabelled drawing dimensions and 3D geometry are not extracted by this text reader.
Entered rate and margin override source values for this import. System and deck are used when not given in the source. Quantity defaults to 1 when not stated. Overall or T/T length does not replace straight shell length; internal diameter does not replace external diameter.
Files are processed in your browser; source files are not stored. Up to 25 files, 25 MB each, 100 MB total and 100 pages per PDF.
Review extracted equipment
All editable dimensions below are in metres; area is m². Choose equipment geometry and correct any conflicting values. Plot-only tags start unselected.
| Use | Tag / description / source | Equipment type | External D m | Shell / footprint L m | Width m | Protected height m | Entered area m² | Qty | Calculated preview | Checks & source evidence |
|---|
Only complete selected rows can be added. Save project preserves extracted evidence, not the original source files. Existing equipment is preserved; duplicate tags are blocked. Rates, margins, coverage portions and simultaneous systems remain your project criteria.
Equipment demand DELUGE_11 BASIS
Enter dimensions in metres. Applicable inputs depend on equipment type; areas and demand update as you type. Use Options for protected portions, entered areas and report references.
| Equipment & location | Dimensions · metres | Application criteria | Calculated results | Details | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Level / deck | Equipment description Tag number | Equipment type | No. | External D m | Length m | Width m | Height m | Application rate L/min/m² | Margin % | Deluge system tag | Protected area per item · m² | Floor area total · m² | Developed area total · m² | Required per item · L/min | Included demand total · L/min | Demand m³/h | Options |
Total area includes quantity once. Included demand = quantity × protected area per item × application rate × (1 + margin / 100). Incomplete or invalid rows are excluded from totals and must be completed before saving or exporting.
Equipment demand schedule
| Level | Area / equipment description | Tag number | No. | Floor area | Developed surface area | Coverage type | Application rate L/min/m² | Margin % | Firewater demand | Report reference | Actions | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Length m | Width m | Total area m² | T/T m | ID m | No. dished ends | Total area m² | L/min | m³/h | |||||||||
Demand by level / deck
| Level | Floor area (m²) | Developed surface area (m²) | Demand (L/min) | Demand (m³/h) |
|---|
Deck totals sum equipment rows and included spray-nozzle scenarios. Simultaneous fire scenarios determine the governing plant demand.
Deluge system summary
| System | Equipment quantity | Protected area (m²) | Minimum demand (L/min) | Demand (L/min) | Demand (m³/h) | Remarks |
|---|
Minimum demand is area × application rate before allowance (installed nozzle scenarios: SPD minimum application demand). These are individual system demands; their sum does not establish the governing simultaneous fire scenario or pump capacity.
Spray nozzles & coverage SPD WORKSHEET
Vessel shell and end protection by installed spray nozzles. Suggested geometry follows the SPD worksheet formulas; required K-factors are calculated for your selected counts. Select a manufacturer nozzle at the actual nozzle pressure and review coverage before use.
Suggested and selected arrangement
| Parameter | Suggested shell | Selected shell | Suggested ends | Selected ends |
|---|
Nozzle hydraulics & quantities
| Nozzle group | Model | Quantity | Required K | Selected K | Required flow / nozzle · L/min | Selected flow / nozzle · L/min |
|---|
| Demand / density | Shell | Ends | Total / average |
|---|
Coverage indicators
| SPD indicator | % of shell area | Equivalent area · m² |
|---|
Developed shell arrangement
Schematic only: nozzle centres on an unwrapped shell, with axial footprint strips and the SPD tangent arc. End nozzles are counted separately. This is not a 3D obstruction study or a verified percentage of surface wetting. The legacy indices can exceed 100% because overlapping areas are added repeatedly.
Simultaneous fire scenarios
| Scenario | Systems | Deluge L/min | Other L/min | Hose streams L/min | Margin L/min | Total L/min | m³/h | Duration min | Volume m³ |
|---|
The highest design demand among included scenarios feeds pump sizing; tank sizing uses each scenario's design flow and supply duration.
Consolidated sizing summary
FW pump sizing PRELIMINARY
Preliminary sizing: the pump calculation workbook and final datasheet template have not been supplied. Workbook-specific verification and template mapping remain pending.
100% equals the governing design demand. A blank rated capacity uses the proposed percentage allocation; it is not a vendor-selected rating. Three pumps at 33% provide 99% and have no inherent standby capacity.
| Pump tag | Role | Driver | Capacity % | Selected rated flow · m³/h (blank = proposed) | Available |
|---|
Hydraulic design basis
All elevations use one project datum. Pressure mode uses flowing suction-flange gauge pressure; open-tank mode uses the minimum water-surface elevation. All losses refer to the governing flow condition.
Vendor data & pump curves
Enter curve points as flow (m³/h), head (m), one pair per line. Only interpolation within the supplied range is used. Parallel flow is summed at the same required differential head, assuming a common suction/discharge system. A full network operating-point calculation is outside this preliminary check.
| Pump | Required duty · m³/h | Rated / proposed · m³/h | Curve head at duty · m | Hydraulic power · kW | Shaft power · kW | Flow/head assessment |
|---|
NFPA 20 / project assessment
Enter verified performance criteria
No code limits are assumed. Enter the applicable limits and exact references from your adopted standard, then confirm verification. Missing criteria remain Not assessed.
| Check | Reference / edition | Evidence | Result | Outstanding information |
|---|
Additional installation checks
Final driver selection requires the full vendor power curve and applicable motor/diesel derating. These individual checks do not certify the complete fire pump installation. Reference: NFPA 20 — stationary fire pumps.
Firewater tank sizing
Usable storage, manual dimensions and tank level checks. Each fire scenario's design flow and supply duration set its storage requirement.
For 2 × 100%, each tank holds the full required usable storage. Duration comes from the project's approved fire protection basis; 2, 4 and 6 hours are selectable options, not universal NFPA 22 requirements.
Storage scenario comparison
| Scenario | Design demand · m³/h | Duration · h | Gross requirement · m³ | Approved refill credit · m³ | Required usable · m³ |
|---|
Manual tank dimensions
Minimum usable water level defines the unusable bottom volume. Additional displaced volume must exclude that bottom volume. Freeboard is excluded above maximum water level; it is not subtracted again from usable depth.
NFPA 22 / project assessment
This tab calculates process capacity and geometry. Structural, foundation, seismic and detailed mechanical design require separate assessments. Reference: NFPA LiNK — adopted NFPA 22 edition.
Project basis and calculation method
Qscenario = (selected system demands + other loads + hose streams) × (1 + additional margin / 100)
Vcase = Qscenario × duration / 1000
Entered protected areas take precedence over calculated geometry and are not reduced again by the partial-coverage choice. T/T, ID and dished-end reference fields do not replace the external/shell dimensions used in legacy geometry.
Calculated geometry uses Deluge_11.xls (2005), with its legacy constants 3.14 and 0.785. Earlier project files are recalculated using this basis on opening. Entered protected areas continue to override the geometry.
Pump / pump skid uses the selected protected ground footprint (L × W), following the workbook EQ/GP ground-area relationship, or an explicitly entered protected area. Include the driver in the selected dimensions/area when required by the project basis. This row calculates water applied to process equipment; it does not size a firewater supply pump.
D = developed surface area; F = floor area. The supplied schedule shows no W examples and its Note 2 is not visible; a W calculation is not assigned without that definition.
TI = total; UH = half of total area for horizontal equipment; PV = protected vertical portion with one end included. MV excludes the bottom face. For irregular geometry or a different partial-area definition, use Entered protected area.
Equipment demand is area-based. Installed spray-nozzle demand, pump head, NPSH and tank storage are calculated in their own tabs; pipe network hydraulics are outside this tool.
Application rates, allowances, fire scenarios and supply durations remain project inputs. The example rates are not automatic NFPA compliance criteria. Calculated volume excludes unusable storage and refill credits.
Save project downloads your calculation file, including nozzle, pump and tank inputs. Open project restores it; leaving this page does not save changes.
Method & guidance
Equipment reference surfaces
| Code | Equipment | Dimensions | Reference surface formula · m² |
|---|---|---|---|
| VO | Horizontal vessel | D, L | TI: 3.14 × D × L + 2 × 0.785 × (1.22 × D + 0.1)²; UH: half of TI |
| VV | Vertical vessel | D, H | TI: 3.14 × D × H + 2 × 0.785 × (1.22 × D + 0.1)²; PV: one end |
| SC | Cylinder with spherical ends | D, L | TI: 3.14 × D × L + 3.14 × D²; UH: half of TI |
| CL | Column | D, H | TI: 3.14 × D × H + 2 × 0.785 × 1.2 × D²; PV: one end (matches the DLG-2000 column formula) |
| MV | Box equipment (5 faces) | L, W, H | 2 × L × H + 2 × W × H + L × W (bottom excluded) |
| MA | Ground / manifold area | L, W | L × W |
| PUMP | Pump / pump skid | L, W or area | Protected footprint L × W, or entered protected area |
| MANUAL | Entered area | Area | Entered protected area per item |
System specifications
WDS Water Deluge Spray System · FDS Foam Deluge Spray System · WDM Water Deluge Monitor System · FDM Foam Deluge Monitor System · WDB Water Deluge Barrier.
Deluge system tags are mandatory. Application rates are user inputs from the appropriate project design basis. The source guidance refers to NFPA 11, 15, 16 and other project codes; this tool preserves that historical guidance and does not select rates or verify current code compliance. Allowance accounts for additional flow from hydraulic balancing; the workbook guidance describes approximately 10–15%, so enter the project-specific value. Convert L/min to m³/h by multiplying by 0.06.
Foam system results are water/foam-solution application demand. Foam concentrate quantity, storage duration and hydraulic pressure sizing are outside this worksheet method.
SPD spray nozzle method
Types: VO horizontal vessel, VV vertical vessel, SC cylindrical exchanger (VO branch), CL column (VV branch). The original suggested-count formula only recognises VO/VV; SC/CL use the corresponding orientation explicitly.
Shell area = 3.14 × diameter × length/height. End area = 0.785 × diameter² × flat ends + 0.785 × (1.22 × diameter + 0.1)² × elliptical ends + 3.14 × diameter² / 2 × spherical ends (SPD rows 11–18).
Pattern diameter = 2 × working distance × tan(spray angle / 2). Tangent angle and suggested counts follow SPD rows 24–30. Horizontal shell rows above three must be even so the upper/lower split represents whole rows. End count = ends × end rows × end nozzles per row; the source does not define end nozzle coordinates.
Nozzle flow = K × √pressure, with K in L/min/√bar and pressure at the nozzle in bar. Demand = Σ(quantity × nozzle flow). Required K-factors use SPD's shell/end allocation for the selected counts (rows 41–48 and 59–61). No additional allowance is applied to installed-nozzle demand.
Rundown, hot spot and overlap use SPD rows 31–34. Negative values display as zero, matching the worksheet's "no"; raw values are included in the exported report. Water dispersion uses SPD row 35, converted from a fraction to a percentage. Rundown is an assumption in the worksheet, not verified wetting. Actual spray envelopes, orientation, obstructions, wind, pressure variation, end geometry and manufacturer spacing limits require design review. A total flow meeting the target does not establish full coverage.
An included nozzle scenario adds its installed demand to its deluge system. Give it the same equipment tag as an area-based row to offer both as alternatives; each fire scenario must then choose one source.
Pump sizing
NPSHa = atmospheric head + suction total head − vapour pressure head
Hydraulic power kW = density × 9.80665 × flow (m³/s) × head (m) / 1000
Shaft power kW = hydraulic power / efficiency
Pressure head = pressure (bar) × 100000 / (density × 9.80665). Duty pumps share the governing design demand in proportion to their capacity percentages. Vendor curves are interpolated linearly inside the supplied range only.
Tank sizing
Cylindrical usable volume = π × D² / 4 × (maximum level − minimum level) − additional unavailable volume
Rectangular usable volume = L × W × (maximum level − minimum level) − additional unavailable volume
Using the tool
- Enter equipment rows, their dimensions, application rate, allowance and deluge system tag.
- Optionally design installed spray nozzles for vessels and include them in demand.
- Define simultaneous fire scenarios, hose streams, margin and supply duration.
- Size the firewater pumps from the governing design demand and hydraulic basis.
- Size the firewater tank from the governing storage scenario.
- Review validation messages, then save the project, export CSV or print the reports.