How to Insulate Steam Pipe



Usually, the process of applying material to insulate steam pipes can greatly increase the heating efficiency of a steam system. Steam is commonly used in many older homes and buildings to carry heat from the boiler unit. And the uninsulated steam pipe distribution and condensate return pipes are a major source of heat loss. Properly insulating these pipes can drastically reduce heat losses by as much as 90 percent. It can also enhance safety as these pipes can get extremely hot.

The pipes you'll need to insulate can vary from 1/2 inch to 6 inches in diameter. And there is a variety of materials you can use to insulate steam pipes, such as polyethylene, neoprene foam and fiberglass. Some other steam pipe insulation products include foil-encased bubble wrap, spray-on ceramic coatings and closed-cell rubber insulation sheets. However, fiberglass insulation is currently the most common product for steam pipe insulation in residential and commercial settings.

Fiberglass is easy to install and can be purchased in insulation sleeves. This insulation is comprised of inorganic fibers, which are bonded with special resin. Besides, an aluminum-foil facing or vapor retarder is attached. And it is usually available in 3-foot sections.

Seal and secure the fiberglass insulation sleeves with the recommended high-temperature tape. There are also special fiberglass insulation fitting covers that can be installed on elbows or tees in the pipe line. Make sure you purchase the proper size.

Before starting a steam pipe insulation project, be sure that you identify any problems with moisture, including pipe leaks, malfunctioning valves or leaks from tubes. If the insulation gets wet, the water will compromise the integrity of the insulation and it will not do its job.

It may help to first draw a sketch of the pipe layout. You’ll need the lengths as well as the diameters of the variety of pipes you are insulating. Identify the fittings such as tees and elbows and the number of fittings that you must insulate.

More importantly, when working around steam pipe, be aware that these pipes can get extremely hot if the system is operating. So wear a high efficiency particulate air (HEPA) respirator, a helmet, work gloves and other protective clothing. Also, be careful that you don’t damage insulation that is already in place.