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Non metallic expansion joint

key word:Heat exchange element


Product description

Non metallic expansion joint

 

1. Introduction

1.1. Application

Nonmetallic expansion joint is used in flue gas duct and flue of desulfurization system to compensate the size change or relative displacement of pipeline or equipment caused by thermal expansion and cold contraction, mechanical displacement or vibration, so as to protect equipment and flue from damage and deformation. Its main characteristics are small axial size, no rebound to the pipeline, and large three-dimensional displacement can be absorbed.

1.2. Model meaning

JP AII 0 – 300 / 4600*2400 *

JP --- rectangular expansion joint

AII -- structure and parameters ( type A structure, type II baffle)

0 --- interface mode (flange type)

300 --- effective length of expansion joint L0 (mm)

4600 * 2400 --- pipe dimension BXH (MMX mm)

*When the cross-sectional areas of the pipes on both sides of the non-metallic expansion joint are different, the pipe sizes at the inlet (gas) side and the outlet (gas) side shall be indicated here.

 

YP AII 1-300 / 4500

YP -- circular expansion joint

AII -- structure and parameters (type A structure, type II baffle)

1 -- interface mode (welding type)

300 --- effective length of expansion joint Le (mm)

4500 --- pipe outer diameter B × H (MMX mm)

*When the cross-sectional areas of the pipes on both sides of the non-metallic expansion joint are different, the pipe sizes at the inlet (gas) side and the outlet (gas) side shall be indicated here.

1.3. Structural features

The non-metallic expansion joint is composed of non-metallic body and metal frame. The frame is composed of a pressing plate for fixing non-metallic body, a metal frame and a metal baffle which plays a guiding role. The combination of pressing plate and metal frame is called main frame structure.

1.3.1. The main structure of the rack is divided into four types: A, B, C and D, as shown in Figure 24-1.

1.3.2. The metal baffle is divided into three types: I, II and II, as shown in Figure 24-2.

1.3.3. The composition and function of typical expansion joint are shown in Figure 24-3

1.3.3.1. Skin (see 1 in Figure 24-3). The skin is the main part of the expansion joint. It is composed of multi-layer high temperature resistant non-metallic materials to prevent air leakage and absorb thermal displacement and vibration.

1.3.3.2. Thermal insulation blanket (see 2 in figure 21-3). The heat insulation quilt is composed of high temperature resistant aluminum silicate material, and its width is the same as that of the outer skin. During installation, the heat insulation is fixed on the frame flange together with the skin, which not only has good tensile strength, but also reduces the heat transfer from the flange to the outer skin in the flue.

1.3.3.3. Thermal insulation packing layer (see 3 in Fig. 24-3). It is used to isolate the high-temperature gas outflow in the pipeline, reduce the working temperature of the skin and improve its service life

1.3.3.4. Stainless steel wire mesh (see 4 in Figure 24-3). It is used to prevent the foreign matters in the flue from entering the expansion joint or the heat insulation material in the expansion joint from leaking into the flue.

1.3.3.5. Rack (see 5 in Figure 24-3). The frame is welded and assembled by metal materials and is composed of pressing plate, frame and baffle plate. It is used to fix the skin and place the insulation material.

1.4. Working principle

The soft metal body of non-metallic expansion joint has the functions of heat insulation, vibration absorption, displacement absorption and sealing.

1.5. Product series

The non-metallic expansion joint is a non-standard product, the axial effective length is L0    150-800mm, and the circumferential dimension can be made according to the needs of users.

 

2. Main technical parameters

2.1. The effective length L0 is generally determined by the displacement and is determined by table 24-1

Displacement


Main structure form
Axial displacement Lateral displacement
of effective length L0 of effective length L0
25% 40% 50% 25% 40% 50%
A        
B        
C          
D      

2.2. The pressure that the expansion joint can bear is limited to 0.04MPa.

2.3. The medium in the pipeline is limited to flue gas, air and a small amount of liquid.

2.4. When the lateral displacement is greater than 30%, the pipeline is installed in deviation in advance.

 

3. Equipment dimensions and structure

Typical section and structural dimensions of non-metallic expansion joint are shown in figure 24-4

There are flange type (see figure 24-4a) and welding type (see figure 24-4b) to connect non-metallic expansion joint and pipeline. The total length of flange type expansion joint is L = L0 + 2*120mm ; the total length of welded joint is L = L0 + 2*110mm, and the lap size is X = 40~50 mm.

 

4. Selection method

According to the flue displacement, the main structure and baffle form of expansion joint metal frame are selected, and the skin structure is selected according to the flue gas temperature and medium.

 

5. Scope of supply and ordering instructions

5.1. Scope of supply

The scope of supply of non-metallic expansion joint includes skin, heat insulation quilt, thermal insulation filler layer, stainless steel wire mesh and frame, etc. the specific supply content shall be determined according to the contract.

5.2. Order requirements

The order must include the following information:

5.2.1. Inner diameter of connecting pipe (inner diameter of expansion joint).

5.2.2. The distance between pipes or flanges where expansion joints need to be installed.

5.2.3. Maximum working pressure of expansion joint (Pa)

5.2.4. Maximum and minimum operating temperature of expansion joint (℃).

5.2.5. If the interface mode is flange connection, the interface flange drawing shall be provided.

5.2.6. Medium.

5.2.7. Three dimensional displacement data.

5.2.8. In case of non-metallic body, the installation flange type, bolt size and quantity shall be provided.

 

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