Variable spring hangers and supports

JK series

JK series variable force spring support hangers are mainly used for supporting important equipment and pipelines in the petrochemical and power industries. Applicable to workplaces with a load range of 0.28~217.38 KN, a displacement range of 0~120mm, a load change rate of no more than 25%, and an ambient temperature range of -20~200°C. It has the characteristics of compact structure and convenient installation.

Performance characteristics

1. Load and displacement range. Load range: 154KN displacement range oil species: 0-30mm, 0-60mm, 0-90mm, 0-120mm;

2. Temperature range of use: - 20 ~ 200℃；

3. Spring hanger with the shell protection spring, from mechanical damage and environmental corrosion;

4. The spring support hanger is provided with load and displacement indicating plate, and the design position of cold and heat state is marked on the plate.

The choice of spring support hanger

1. Selection of spring specifications

According to the working load of the support and hanger, the displacement is the direction of displacement, and the spring number is selected according to Table 2.

If the pipe displacement direction is upward, the working load is generally checked from the middle line and the upper thick line in Table 2, and then the installation load is checked downward according to the displacement amount.

If the pipe displacement direction is downward, the working load is generally checked from the middle line and the upper thick line in Table 2, and then the installation load is checked upward according to the displacement amount.

When selecting, whether the pipe is up or down, the working load and installation load should be between the upper and lower thick lines in Table 2, and the load change rate should not exceed 25%.

Load change rate = {(working load - installation load) / working load} × 100% ≤ 25%

Where:

When the displacement is upward, the installation load = working load + displacement amount × spring stiffness;

When the displacement is downward, the installation load = working load - displacement amount × spring stiffness.

Spring selection example:

(1) The working load of a certain pipeline is 8225N, the displacement is upward when running, and the displacement is calculated to be 10mm. Try to select the spring.

a) Check Table 2 to determine the range of the hanger displacement is 0-60mm

b) In the centre line of the table 2 and the upper thick line, the working load of the hanger number 12 is 8223N.

c) With the 0-60mm scale value corresponding to 8225N, the installation is down to 10mm and the sum is 971N.

d) Check the load change rate: {(8223-9721)/8225}×100%=18.2%<25%

e) Therefore, use a spring with a displacement range of 0-60mm and number 12

(2) The working load of a pipeline is 2020N, the displacement is downward when running, and the displacement is calculated to be 40mm. Try the spring.

a) Check Table 2 to determine the range of the hanger displacement 0-60mm

b) In the centre line and the lower thick line of Table 1B, the working load of the hanger number 6 is 2018N, which is closest to 2020N.

c) With the 0-60mm scale value corresponding to 2018N, the installation load is 1480N up to 40mm.

d) Check the load change rate: {(2018-1480)/2018}×100%=26.7%<25%

e) Therefore, the displacement range of the first gear is 0-90mm, and the installation load can also be calculated = 2018-40×8.967=1659N

f) Re-check the load change rate: {(2018-1659)/2018}×100%=17.8%<25%

g) Therefore, the spring with the displacement range of 0-90mm and number 6 is selected.

2. According to the space structure of each lifting point, the working requirements select the housing structure and model of the spring support hanger. Still the above example:

(1) According to the pipeline arrangement, the installation type is A type, so the selected spring hanger is JK30A12.

(2) According to the pipeline arrangement, the installation type is B type, so the selected spring hanger is JK90B6.

III  Connection styles