คำนวณ Total Dynamic Head (TDH) สำหรับระบบปั๊มสระว่ายน้ำด้วยสูตร Hazen-Williams ขนาดท่อ ความยาว อัตราการไหล และข้อต่อ
Total Dynamic Head (TDH) is the total resistance your pool pump must overcome — a sum of static head (vertical lift) and friction losses in pipes and fittings. Use TDH with a pump's performance curve to pick the right horsepower and flow rate.
Enter your pipe diameter (1.5 to 3 inches), straight pipe length, flow rate in GPM, static head in feet, plus the number of 90° elbows and check valves. The calculator uses Hazen-Williams for PVC (C=130) and adds equivalent pipe length for each fitting.
Keep suction line velocity below 8 ft/s and discharge below 10 ft/s to reduce noise, pipe wear, and cavitation. If velocity is too high, upsize the pipe. For most residential pools, 2-inch plumbing is the sweet spot.