Lagged Pipe Apparatus
Product Code : EL-HTL-11079
Quick answer: The Lagged Pipe Apparatus is a heat transfer lab setup for finding the thermal conductivity of pipe insulation. Three concentric GI pipes, 1 m long, hold two lagging materials around a central Nichrome cartridge heater. Thermocouples on the pipe surfaces and a multichannel digital indicator give the temperatures, and a voltmeter and ammeter give the heater power.
Specifications
| Item | Specification |
|---|---|
| Innermost pipe (GI) | 6 cm outer diameter |
| Middle pipe (GI) | 8.5 cm mean diameter |
| Outermost pipe (GI) | 10.7 cm inner diameter |
| Pipe length | 1 m |
| Lagging | Two different lagging materials, one between each pair of pipes |
| Heater | Nichrome wire cartridge heater, placed centrally along the pipe axis |
| Control panel | Single-phase dimmerstat, voltmeter (0-250 V), ammeter (0-2 A) |
| Temperature indicator | Multichannel digital, 0-300 °C, with Cr/Al thermocouples |
| Electrical supply | Single phase, 230 V AC |
| Floor area | 1.5 m x 1 m, height 0.5 m |
For the lagging materials fitted to the current version, email [email protected] with the house code EL-HTL-11079.
How the lagged pipe experiment is done
The heater on the axis of the innermost pipe sends heat outward through the two lagging layers. When the temperatures stop changing, the heat flow through each layer is taken as equal to the electrical input to the heater.
- Switch on the supply and set the heater input with the dimmerstat.
- Wait until the thermocouple readings are steady.
- Record the voltmeter and ammeter readings and the temperature of each pipe surface.
- Work out the heat input (voltage x current) and use the equation for radial conduction through a cylinder to find the thermal conductivity of each lagging layer.
- Repeat at another heater setting and compare the results.
The same readings give the resultant thermal conductivity of the two layers together, which shows students how multi-layer pipe insulation reduces heat loss.
Key features
- Three concentric GI pipes, 1 m long, mounted on a stand with two different lagging materials between them
- Nichrome wire cartridge heater placed centrally along the pipe axis
- Cr/Al thermocouples on the pipe surfaces, read on a multichannel digital indicator (0-300 °C)
- Single-phase dimmerstat to vary the heater input
- Voltmeter (0-250 V) and ammeter (0-2 A) to measure the heater power
- Gives the thermal conductivity of each lagging material and of the two layers together
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Lagged Pipe Apparatus at its works in Laxmi Nagar, Delhi, and supplies it to engineering colleges, polytechnics and TVET institutes in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Heat Transfer Lab products
- Composite Walls Apparatus (EL-HTL-11078)
- Heat Pipe Apparatus (EL-HTL-11080)
- Critical Radius of Insulating Material (EL-HTL-11081)
- Pin Fin Apparatus (EL-HTL-11082)
- Natural Convection Apparatus (EL-HTL-11083)
- Forced Convection Apparatus (EL-HTL-11084)
The full range is in the Heat Transfer Lab section of the Engineering Lab range.
Frequently asked questions
What does the Lagged Pipe Apparatus measure?
It measures the thermal conductivity of the two insulating (lagging) materials packed between three concentric GI pipes, using radial heat flow from a central heater.
How are the temperatures measured?
Cr/Al thermocouples on the pipe surfaces are read on a multichannel digital temperature indicator with a 0-300 °C range.
What does the apparatus need to run?
A single-phase 230 V AC supply and a floor area of about 1.5 m x 1 m; the setup is 0.5 m high.
Request a quote
Email [email protected] with the house code EL-HTL-11079 and the quantity, or add the Lagged Pipe Apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.