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Steel Pipes Heat Loss

Reference data and engineering information about steel pipes heat loss for material properties applications.

steelpipesheatlossCalculator

Overview

Engineering reference data for Steel Pipes Heat Loss in material science and properties.

Key Formulas

Stress

σ=FA\sigma = \frac{F}{A}

Force per unit area.

Strain

ε=ΔLL0\varepsilon = \frac{\Delta L}{L_0}

Change in length per original length.

Hooke's Law

σ=Eε\sigma = E \varepsilon

Stress proportional to strain in elastic region.

Thermal Expansion

ΔL=αL0ΔT\Delta L = \alpha L_0 \Delta T

Length change due to temperature.

Variables

SymbolDescriptionUnit
σ\sigmaStressPa
ε\varepsilonStrain—
EEYoung's modulusPa
α\alphaThermal expansion coefficient1/°C
ΔT\Delta TTemperature change°C

Heat Loss Data Tables

13 rows
Heat loss from fluid inside uninsulated steel pipes (W/m) at various temperature differences (ΔT) between pipe and ambient air.
Nominal Bore(mm)
Nominal Bore(inch)
ΔT 50°C(W/m)
ΔT 60°C(W/m)
ΔT 75°C(W/m)
ΔT 100°C(W/m)
ΔT 110°C(W/m)
ΔT 125°C(W/m)
ΔT 140°C(W/m)
ΔT 150°C(W/m)
ΔT 165°C(W/m)
ΔT 195°C(W/m)
ΔT 225°C(W/m)
ΔT 280°C(W/m)
151/230406090130155180205235280375575
203/4355070110160190220255290370465660
251406090130200235275305355455565815
321 1/450701101602402903303754355557001000
401 1/255801201802703203754204856257901120
50265951502203303954655206007709751390
652 1/28012017026039046554061571591011501650
803100140210300470560650740860109013801980
10041201702603805857008209251065137017402520
1506170250370540815970113012901470191024303500
200822032047069010401240144016501900244031004430
2501027039057083512501510175019952300298037805600
3001231546067098014701760206023402690337044306450

Source: engineeringtoolbox.com

Installation Correction Factors

6 rows
Correction factors for heat loss values based on pipe installation configuration.
Application
Correction Factor
Single pipe freely exposed1.1
More than one pipe freely exposed1
More than one pipe along the ceiling0.65
Single pipe along skirting or riser1
More than one pipe along skirting or riser0.9
Single pipe along ceiling0.75

Source: engineeringtoolbox.com

Common Formula Usage Notes

The heat loss data provided is based on empirical measurements for uninsulated, bare steel pipes in still air. The values represent heat transfer through convection and radiation. To use this data effectively:

  1. Determine the Temperature Difference (ΔT): Calculate ΔT=Tpipe−TambientΔT = T_{pipe} - T_{ambient}.
  2. Find Base Heat Loss: Locate your pipe size and the corresponding ΔT in the first table to get the base heat loss in W/m.
  3. Apply Correction Factor: Multiply the base value by the appropriate correction factor from the second table based on your pipe's installation configuration. Qcorrected=Qbase×Correction FactorQ_{corrected} = Q_{base} \times \text{Correction Factor}
  4. Consider Additional Losses: These tables do not account for heat loss through pipe supports (thermal bridges) or due to wind exposure. Significant wind will increase the heat loss coefficient.

Unit Conversions

For reference, the following conversions are provided from the source data:

  • Power: 1 kW=1000 J/s=3413 Btu/h=859.9 kcal/h1 \text{ kW} = 1000 \text{ J/s} = 3413 \text{ Btu/h} = 859.9 \text{ kcal/h}
  • Length: 1 m=3.2808 ft=39.37 in1 \text{ m} = 3.2808 \text{ ft} = 39.37 \text{ in}

Interactive Charts

Uninsulated steel pipes - heat loss diagram

References

Source: engineeringtoolbox.com