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ENGINEERING CALCULATORS

Pipe pressure loss & loss power calculator

Engineering calculators (Beta)

Find pressure loss, head loss and power needed to replace those losses.

Inputs

Choose units and enter numbers. Full-width digits and fractions such as 1/8 or 1 3/8 are accepted. Changing a unit converts the entered value.

Results

Reference calculation only. Results do not certify suitability for an actual design or its safety.

Diagram

Inputs: select a blue symbol to edit Results: red-orange values and lines

Formula and applicability

Δp=(fL/D+ΣK)ρv²/2; laminar f=64/Re; turbulent 1/√f=−2log10[ε/(3.7D)+2.51/(Re√f)]; P=QΔp/η

Displayed values are rounded. Diagrams illustrate the calculation conditions. Initial material and fluid properties are examples; replace them with values for the actual material, temperature and conditions.

Reference
Using this information as a reference

Equations assume particular loads, supports and deformation ranges. Check inputs, units and the applicability of each equation. Diagrams explain conditions; they are not manufacturing drawings or proof of safety.

Material values are typical values or reference ranges, not certified product properties or ready-to-use design allowables. They vary with standards, product form, dimensions, temper and temperature. Check the specifications and inspection certificates for the actual product.

Displayed safety factors and checks apply only to the supplied inputs and calculation model. They do not automatically establish the safety of a complete design, including code compliance, service life, fatigue or joints. For actual design, manufacture and use, separately verify applicable regulations and standards, product specifications, and the necessary tests and engineering review.

Calculations do not submit input values to a server. Results are not an automatic code-compliance or safety determination.

この計算で求められること

管摩擦と局部損失から、圧力損失・損失水頭・補填動力を求めます。

入力・結果・適用条件を確認する

選択した形状・計算方法により、使う項目は変わります。実際の計算は上の図と入力欄で行えます。

主な入力

  • 管内径 D (mm / cm / m)
  • 体積流量 Q (L/min / m³/h / m³/s)
  • 直管長 L (m / mm / ft)
  • 絶対粗さ ε（入力例） (mm / cm / m)
  • 密度 ρ（入力例） (kg/m³ / g/cm³ / g/L)
  • 粘度 μ（入力例） (Pa·s / mPa·s / cP)
  • 局部損失係数の合計 ΣK (—)
  • 損失補填の効率 η (% / fraction / ‰)

得られる結果

  • 平均流速 (m/s)
  • レイノルズ数 (—)
  • Darcy摩擦係数 f（Fanning係数ではありません） (—)
  • 合計圧力損失 (kPa)
  • 損失水頭 (m)
  • 損失補填に必要な入力動力 (W)
  • 遷移域：層流式を仮定した参考値 (kPa)
  • 遷移域：乱流式を仮定した参考値 (kPa)

計算式の概要

Δp=(fL/D+ΣK)ρv²/2; laminar f=64/Re; turbulent 1/√f=−2log10[ε/(3.7D)+2.51/(Re√f)]; P=QΔp/η

満管・定常・非圧縮性ニュートン流体。Re<2300は層流、Re≥4000はColebrook式を数値的に解きます。遷移域は単一値を出さず2つの仮定値を表示しますが、実際の上限・下限ではありません。圧縮空気・キャビテーション・非円管・水撃は対象外。動力は配管損失分のみで、高低差などを含むポンプ全体の選定ではありません。

現在選択中の方法には、操作欄の「計算式・適用条件」を使ってください。参考計算であり、設計全体の安全性を保証するものではありません。

関連する計算

What this calculator does

Find pressure loss, head loss and power needed to replace those losses.

Inputs, outputs and applicability

The selected model determines which of these inputs and outputs apply. Use the working diagram and input panel above to calculate.

Inputs

  • Pipe bore D (mm / cm / m)
  • Volume flow Q (L/min / m³/h / m³/s)
  • Straight pipe length L (m / mm / ft)
  • Absolute roughness ε (example) (mm / cm / m)
  • Density ρ (example) (kg/m³ / g/cm³ / g/L)
  • Dynamic viscosity μ (example) (Pa·s / mPa·s / cP)
  • Sum of minor-loss coefficients ΣK (—)
  • Loss replacement efficiency η (% / fraction / ‰)

Calculated results

  • Mean velocity (m/s)
  • Reynolds number (—)
  • Darcy friction factor f (not Fanning) (—)
  • Total pressure loss (kPa)
  • Head loss (m)
  • Input power to replace losses (W)
  • Transition: laminar-formula scenario (kPa)
  • Transition: turbulent-formula scenario (kPa)

Formula overview

Δp=(fL/D+ΣK)ρv²/2; laminar f=64/Re; turbulent 1/√f=−2log10[ε/(3.7D)+2.51/(Re√f)]; P=QΔp/η

Full circular pipe, steady incompressible Newtonian fluid. Re<2300 uses laminar flow; Re≥4000 numerically solves Colebrook. Transition flow shows two scenarios instead of one result; they are not guaranteed bounds. Compressed air, cavitation, noncircular ducts and water hammer are excluded. Power replaces pipe losses only, excluding elevation and complete pump sizing.

The displayed formula and conditions in the working panel apply to the currently selected model. Reference calculation only; it does not certify a complete design.

Related tools

入力する単位を確認・換算する

Check and convert input units

数値の感覚を、図と動きで確かめる

説明用の別モデルです。適用条件を確認してください。数値は自動転記しません。

See the idea in diagrams and motion

A separate explanatory model. Check its assumptions; values are not transferred.

粘度から流れの抵抗へ
  1. 1. 単位をそろえる粘度の単位換算 →
  2. 2. 必要な条件で計算する配管の圧力損失現在のページ
  3. 3. 動き・違いを図で見るスプーンから垂れる液体 →

配管計算には流量・密度・管径・長さ・粗さなども必要です。スプーンの図とは別のモデルです。

各ツールは別の条件で開きます。数値は自動転記されません。