**Circumferential Joint in Boilers**

The statement "Circumferential joint in boilers is used to get the required length of a boiler" is **false**. Circumferential joints in boilers serve a different purpose and are not directly related to the length of the boiler.

**Explanation:**

1. **Definition of a Circumferential Joint:** A circumferential joint is a type of weld joint that connects two cylindrical sections together along their circumference. In the context of boilers, it refers to the welding joint used to connect the cylindrical shell sections of a boiler.

2. **Purpose of Circumferential Joints in Boilers:** The primary purpose of circumferential joints in boilers is to ensure structural integrity and maintain pressure integrity. These joints are specifically designed to withstand high-pressure conditions and prevent leakage of steam or hot gases.

3. **Boiler Length Determination:** The length of a boiler is not determined by the circumferential joint. The length of a boiler is determined by the required heating capacity, space availability, and specific design requirements. The boiler length can be adjusted by adding or removing additional cylindrical sections as needed.

4. **Boiler Construction:** Boilers are typically constructed using multiple cylindrical shell sections that are connected together using circumferential joints. These joints are often welded using various welding techniques, such as submerged arc welding or manual welding, to ensure a strong and leak-free connection.

5. **Importance of Circumferential Joints:** Circumferential joints play a vital role in maintaining the overall integrity and safety of the boiler. They are subjected to high-pressure conditions and must be carefully designed and welded to withstand these loads. Proper welding techniques, material selection, and quality control are essential to ensure the strength and reliability of these joints.

6. **Other Factors Affecting Boiler Length:** The length of a boiler may also be influenced by factors such as heat transfer requirements, combustion chamber design, tube arrangement, and overall system efficiency. These factors are determined by the specific application and performance requirements of the boiler.

In conclusion, circumferential joints in boilers are not used to determine the length of a boiler. They are critical weld joints that ensure structural and pressure integrity. The length of a boiler is determined by various design factors and specific requirements of the application.