Question

Why steam pipes are covered with felt or asbestos

Answer 1

Answer:

In cold countries, steam pipes are covered with asbestos or glass wool (the most common modern day material). It prevents heat loss due to conduction

Answer 2

The steam pipe will give up tremendous amount of energy to anything that's colder than it is .. the colder pipes are the faster the steam will condense on them and that's why the builders of old house covered the steam pipe with asbestos .. asbestos insulation keep the steam hot

hope it helps you..