Boiler System Refractory
According to the Refractory Institute, "Refractories are heat-resistant materials that constitute the linings for high-temperature furnaces and reactors and other processing units. In addition to being resistant to thermal stress and other physical phenomena induced by heat, refractories must also withstand physical wear and corrosion by chemical agents. Refractories are more heat resistant than metals and are required for heating applications above 1000°F (538°C)."
In a boiler the refractory protects the metal surfaces at critical points such as the rear door and in the furnace. This refractory should be inspected periodically to insure protection. Here is a list of what the engineers of American Boiler & Mechanical look for and possible maintenance solutions:
- Visually inspect refractory. Look for large cracks or broken pieces. Small hairline cracks are to be expected.
- Wash coat the refractory with a high temperature bonding, air dry mortar.
- Face all cracks and joints with hi-temp bonding cement.
- If any bricks have fallen out or show signs of excessive wear, replace them.
We will also inspect the refractory of the new boilers when they arrive on site. We will check to be sure that the refractory has not been damaged in shipment.