🔍 Key Concepts

• Refractory is the heat-resistant lining inside a furnace or boiler that must be held firmly in place. • Think about which items are specifically designed as fastening or anchoring hardware, versus parts that carry fluid or form structure. • Consider how anchor strips and similar metal pieces are used in conjunction with castable or brick refractory.

💭 Think About

• Ask yourself: which of these items is primarily intended to mechanically hold or tie refractory to the furnace casing? • Could any of the options be dual-purpose, serving as both a functional boiler component and a means of supporting refractory? • If one option is very general (like ‘all of the above’), have you clearly confirmed that each individual item can actually serve as a refractory support?

✅ Before You Answer

• Verify which device is specifically described in study materials or manuals as a refractory anchor or retainer. • Check whether boiler tubes are normally used to anchor lining, or if they are mainly for water/steam circulation only. • Confirm whether brick bolts are a standard method for fastening individual refractory bricks to a steel shell or backing.