1. Liquid temperature, working temperature and range of medium in hose, working environment temperature. The correct pressure grade of the hose should be determined according to the correct pressure of the high temperature.

　　2. The chemical properties of the medium transported in the hose determine the material of the hose and its parts according to the corrosion resistance of the hose material.

　　3. According to the condition of the hose, refer to the correct use and installation method of the metal hose and the optimal length of the hose in settlement compensation. The length calculation of the hose in various motion states, the small bending times and small bending radius of the hose, etc., are used to correctly select the length of the hose and install it correctly.

　　4. Stainless steel compensator pressure range, according to the actual working pressure of the hose, and then query the nominal diameter of corrugated metal hose and pressure gauge.

　　5. The correct length size and nominal diameter of stainless steel bellows, joint type (mainly including flange connection, thread connection and quick connection) and the size and length of metal hose shall be selected.