Study of Tube Pretension Effects on the Strength of the Flat-Round Tubesheet in a Quench Boiler

Round 1

Reviewer 1 Report

 

The topic of the Manuscript is interesting and important, but I’ve some comments:

The Introduction Chapter is weak, with a lot of domestic references.

Line 76 – Please provide the ANSYS version you used, and maybe place it in The Reference Chapter.

Table 1 – I think it should be “Thermal conductivity” not “Thermal consuctivity”

Table 1 – Please verify the unit– “Linear expansion coefficient [×10-6 mm/mm·℃] „

Line 91- Please verify the sentence – “Equivalent tube load calculated by the following equation; “, I think that the verb “was” is missing.

Line 101 – Fig.3 shows not show.

Line 108 - Equation 3 firstly should be given in symbolic and then the result of the calculation.

Please decide on one notation form: Fig. or Figure

Line 196 – “…the primary local membrane stress meets the strength requiremen.” ? maybe requirement?

The Conclusions Chapter should be more elaborated.

Please provide DOI numbers, where it is possible.

 

Please check the Manuscript for spelling errors and punctuation.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

The paper describes pre-tension effects on the strength of the round tubesheet in a quench boiler studied by finite element analysis. The results are sound however the following comments should be taken into account before publication.

1. The abstract should be made more informative. Both dimensions and flow conditions should be mentioned explicitly.

2. Line 52. Introduction.  “Gu et al. [16] analyzed 6 kinds of pre-tension of heat exchange tubes…” . Could you provide more details about these 6 designs and what was studied as well as overall dimensions? The comparison between different studies can be done in a Table.

3. The computational mesh and procedure should be described.

4. Figure 1. Add dimensions and x, y, z coordinates to the Figure (like you did in Figure 8). Specify positions A, B, C shown in Figures 9 and 10.

5. Figure 2. Please specify what part is shown here (provide coordinates x, y, z)

6. Line 87.  Shell-side design pressure of 13.78MPa. Could you add some justification for this number (or a reference).

7. Line 98-99.  The design temperature of the inner heat exchange tubes and flat-round tubesheet is 385℃, and the design temperature of the jacketed tubes is 350℃. This information should be moved to the introduction section (and in the abstract)

8. Line 92-93, 96, 185 Provide the values of all parameters (outside diameter, inner diameter, thread nominal diameter, primary local membrane stress, etc.) in a separate Table.

9. Line 108. Eq. 3 Use symbols instead of numbers in all Equations.

10. Figures 4-7. Add some 2D projections along the plane of max stress intensity. Colors are difficult to read in the 3D Figures

11. LThe paper describes pre-tension effects on the strength of the round tubesheet in a quench boiler studied by finite element analysis. The results are sound however the following comments should be taken into account before publication.

1. The abstract should be made more informative. Both dimensions and flow conditions should be mentioned explicitly.

2. Line 52. Introduction.  “Gu et al. [16] analyzed 6 kinds of pre-tension of heat exchange tubes…” . Could you provide more details about these 6 designs and what was studied as well as overall dimensions? The comparison between different studies can be done in a Table.

3. The computational mesh and procedure should be described.

4. Figure 1. Add dimensions and x, y, z coordinates to the Figure (like you did in Figure 8). Specify positions A, B, C shown in Figures 9 and 10.

5. Figure 2. Please specify what part is shown here (provide coordinates x, y, z)

6. Line 87.  Shell-side design pressure of 13.78MPa. Could you add some justification for this number (or a reference).

7. Line 98-99.  The design temperature of the inner heat exchange tubes and flat-round tubesheet is 385℃, and the design temperature of the jacketed tubes is 350℃. This information should be moved to the introduction section (and in the abstract)

8. Line 92-93, 96, 185 Provide the values of all parameters (outside diameter, inner diameter, thread nominal diameter, primary local membrane stress, etc.) in a separate Table.

9. Line 108. Eq. 3 Use symbols instead of numbers in all Equations.

10. Figures 4-7. Add some 2D projections along the plane of max stress intensity. Colors are difficult to read in the 3D Figures

11. Line 182. According to the stress strength assessment criteria inJB4732-1995 Steel Pressure Vessels - Design by Analysis. Add the reference.

12. PL+Pb+Q  better describe this parameter by words in the textine 182. According to the stress strength assessment criteria inJB4732-1995 Steel Pressure Vessels - Design by Analysis. Add the reference.

12. PL+Pb+Q  better describe this parameter by words in the text

Author Response

Please see the attachment.

Author Response File: Author Response.pdf