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import streamlit as st
# Constants
G = 9.80665 # gravitational acceleration m/s^2
DEFAULT_DENSITY_WATER = 1000.0 # kg/m^3
st.set_page_config(page_title="Pump Power Calculator", layout="centered")
st.title("Pump Power Calculator")
st.write("Calculate pump shaft/motor power from flow, head, fluid density and efficiency.")
# Inputs: flow
st.header("Flow")
flow_value = st.number_input("Flow value", min_value=0.0, value=10.0, format="%.6f")
flow_unit = st.selectbox("Flow unit", ["m³/s", "m³/h", "L/s", "L/min", "m³/hr"]) # choices
# Inputs: head
st.header("Head")
head_value = st.number_input("Head value", min_value=0.0, value=15.0, format="%.6f")
head_unit = st.selectbox("Head unit", ["m", "ft"])
# Fluid properties & efficiencies
st.header("Fluid & Efficiency")
density = st.number_input("Fluid density (kg/m³)", min_value=0.0, value=DEFAULT_DENSITY_WATER, format="%.2f")
efficiency_percent = st.number_input("Pump efficiency (%)", min_value=0.1, max_value=100.0, value=75.0, format="%.2f")
motor_efficiency_percent = st.number_input("Motor efficiency (%) (optional)", min_value=0.1, max_value=100.0, value=95.0, format="%.2f")
# Convert flow to m^3/s
def flow_to_m3s(value, unit):
unit = unit.lower()
if unit in ("m³/s", "m3/s"):
return value
if unit in ("m³/h", "m3/h", "m³/hr", "m3/hr", "m³/hour"):
return value / 3600.0
if unit in ("l/s", "lps", "l / s"):
return value / 1000.0
if unit in ("l/min", "lpm", "l / min"):
return value / 1000.0 / 60.0
# fallback
return value
# Convert head to meters
def head_to_meters(value, unit):
unit = unit.lower()
if unit == "m":
return value
if unit == "ft":
return value * 0.3048
return value
Q_m3s = flow_to_m3s(flow_value, flow_unit)
H_m = head_to_meters(head_value, head_unit)
# Calculations
efficiency = max(min(efficiency_percent / 100.0, 1.0), 1e-6)
motor_efficiency = max(min(motor_efficiency_percent / 100.0, 1.0), 1e-6)
# Hydraulic power (W): P_h = rho * g * Q * H
P_h_W = density * G * Q_m3s * H_m
# Pump shaft power required (accounting for pump efficiency)
P_shaft_W = P_h_W / efficiency if efficiency > 0 else float("inf")
# Motor input power (accounting for motor efficiency)
P_motor_W = P_shaft_W / motor_efficiency if motor_efficiency > 0 else float("inf")
# Present results
st.header("Results")
col1, col2 = st.columns(2)
with col1:
st.metric("Hydraulic power (W)", f"{P_h_W:,.2f} W")
st.metric("Hydraulic power (kW)", f"{P_h_W/1000.0:,.4f} kW")
with col2:
st.metric("Shaft power required (kW)", f"{P_shaft_W/1000.0:,.4f} kW")
st.metric("Motor input power (kW)", f"{P_motor_W/1000.0:,.4f} kW")
st.write("---")
st.subheader("Notes & formulae")
st.markdown(
"""
- Hydraulic power (W) = ρ * g * Q * H
- ρ = fluid density (kg/m³)
- g = 9.80665 m/s²
- Q = flow (m³/s)
- H = head (m)
- Shaft power = Hydraulic power / Pump efficiency
- Motor input power = Shaft power / Motor efficiency
**Unit conversions are handled automatically** for the common flow and head units in the form controls above.
"""
)
st.subheader("Example quick check")
st.write(
f"For Q = {flow_value} {flow_unit}, H = {head_value} {head_unit}, ρ = {density} kg/m³, "
f"pump eff = {efficiency_percent}%, motor eff = {motor_efficiency_percent}%"
)
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