Insulation Jackets IJ
Forbes Marshall removable insulation jackets are available for steam traps, valves, flanges, steam pipeline accessories like moisture separators, condensate pumps, flash separators and other equipment. These insulation jackets help prevent heat loss in the form of radiation losses and help conserve energy while also preventing injuries to plant personnel operating in the proximity.
Forbes Marshall insulation jackets are durable and reusable making them a practical and a cost effective choice compared to traditional insulation methods.
Why are insulation jackets necessary ?
In steam systems, about 8 to 12% of the energy in steam is lost in steam distribution with a significant portion attributed to radiation from high-temperature components like flanges, valves, flash vessels, and moisture separators, which can reach 150-200°C. These losses not only inflate operational costs, but also makes it difficult to maintain.
For plants located in colder climates, these losses are even more amplified with lower ambient temperatures accelerate heat dissipation, further reducing system efficiency and increasing fuel costs.
Related Content:
- Insulating condensate pumps and flash separation vessels to prevent energy loss
- Encon Tip: Keeping the insulation dry reduces radiation loss and thus saves fuel
- Why should moisture separators be insulated?
- Ensuring lowest steam distribution losses
- Manufactured using high-quality insulating material with very low thermal conductivity.
- Aesthetically designed for better look and feel
- Easy to remove and fix again during product maintenance.
Variants
- Models: IJ-PPPPU, IJ-MV55, and IJ-PPPPU-D.
- Application: For the body and receiver of the Pressure Powered Pump Package Unit (PPPPU, MV55, and PPPPU-D).
- Sizes: Available with velcro fitting for sizes DN 25 to DN 80. Separate jackets are available for flange connections.
- Application: For preventing heat energy losses from flanged joints.
- Sizes: Low temperature versions with velcro fitting, suitable for all types of flanges from DN 15 to DN 80.
- Application: For preventing heat energy losses from the body of the strainer.
- Sizes: Low temperature version with velcro fitting suitable for strainers DN 40, 50, 80, and also available for higher sizes.
- Application: For preventing heat energy losses from the body of the moisture separator.
- Sizes: Low temperature version with velcro fitting suitable for moisture separators DN 20, 25, 40, 50, 80, 100, and also available for higher sizes on request.
- Application: For preventing heat energy loss from the body and bonnet of the manifold.
- Sizes: With velcro fitting suitable for DN 15, 20 steam and condensate manifold (4 way, 8 way, 12 way).
- Application: For preventing heat energy loss from the body of the pressure reducing valve.
- Sizes: Available with velcro fitting for:
- FMPRV41: DN 15 to 50
- DSPRV41: DN 40 and 50
- FMPRV53: DN 15 to 80
- Application: For preventing any heat energy losses from piston valves.
- Sizes: Low temperature version with velcro fitting suitable for all sizes of piston valves ranging from DN 15 to DN 250.
- Application: For preventing heat energy loss from the body of the flash vessel.
- Sizes: With velcro fitting suitable for flash vessel DN 150-375 for all standard sizes.
Frequently Asked Questions
The primary function is to prevent heat energy losses from various equipment components, such as flanged joints, valves, separators, and manifolds, while the equipment is in service. This helps to conserve energy and maintain process efficiency.
Forbes Marshall Insulation Jackets are available for a wide variety of equipment, including:
- Steam traps
- Flanges: (IJ-Flange)
- Strainers: (IJ-FMSTR)
- Moisture Separators: (IJ-FMSEP)
- Steam and Condensate Manifolds: (IJ-FMSCM)
- Pressure Reducing Valves: (IJ-FMPRV)
- Piston Valves: (IJ-PSVAL)
- Flash Vessels: (IJ-FMFV)
- Pressure Powered Pump Package Units: (IJ-PPPPU, IJ-MV55, IJ-PPPPU-D)
The limiting condition for the insulation jackets across all listed product variants is a maximum metal surface temperature of 220°C.
Forbes Marshall steam insulation jackets are easy to remove due to the standard velcro fittings, but operators must ensure they wear proper protective clothing as the metal underneath will be at process temperatures.
Yes, they are constructed from non-combustible mineral fibers (rock wool) and aluminum-coated fiberglass cloth.


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