Dopinokan

Dopinokan is your ultimate toolkit for professional pipework design, installation, and maintenance. Whether you're an engineer, plumber, or contractor, this app offers a wide range of powerful calculators to make complex calculations quick, accurate, and hassle-free.
Key Features:
Pipe Bending Calculator
Determine the required bending radius and angle for precision pipe installation in complex layouts.
Fire Sprinkler Flow Rate Calculator
Calculate the required water flow for building sprinkler systems to ensure compliance and safety.
Hydronic Heating Pipe Sizing Calculator
Find the correct pipe size for hot water heating systems to maximize energy efficiency.
Heat Loss in Pipes Calculator
Estimate heat loss in hot water pipes based on insulation thickness and ambient temperature for smarter insulation planning.
Backflow Prevention Valve Sizing Calculator
Choose the right valve size to effectively prevent contamination from backflow.
Pipe Repair Cost Estimator
Get an instant repair cost estimate based on pipe material, labor, and replacement parts—perfect for budgeting and planning.
Tankless Water Heater Flow Rate Calculator
Determine the maximum flow rate your tankless heater can support to ensure system compatibility.
Pipe Friction Loss Calculator
Accurately calculate pressure drop or head loss due to friction, ideal for designing efficient water distribution systems.
Inputs: Pipe length, diameter, material, flow rate, fluid type
Output: Pressure drop (psi or kPa), head loss (feet or meters)
Water Hammer Pressure Surge Calculator
Estimate the pressure surge caused by sudden valve closures or pump shutdowns to prevent potential pipe damage.
Inputs: Pipe length, flow velocity, pipe material, valve closure time
Output: Max pressure surge (psi or kPa)
Pipe Expansion Calculator
Calculate thermal expansion or contraction of pipes due to temperature change—critical for long pipe runs.
Inputs: Pipe material, length, initial and final temperature
Output: Expansion/contraction length (inches or mm)
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