The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform

Chen Wang - One of the best experts on this subject based on the ideXlab platform.

  • ELASTIC STRESSES AND LIMIT BENDING MOMENTS OF CONCENTRIC AND Eccentric Reducers SUBJECTED TO BENDING MOMENTS
    2015
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6 % more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1 % lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe

  • Elastic Stresses and Limit Bending Moments of Concentric and Eccentric Reducers Subjected to Bending Moments
    Volume 1: Codes and Standards, 2014
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6% more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1% lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe.Copyright © 2014 by ASME

Sj Van Vuuren - One of the best experts on this subject based on the ideXlab platform.

  • Review of pump suction reducer selection : Eccentric or concentric Reducers
    Journal of The South African Institution of Civil Engineering, 2014
    Co-Authors: Ross M. Mahaffey, Sj Van Vuuren
    Abstract:

    Eccentric Reducers are traditionally recommended for the pump suction reducer fitting to allow for transportation of air through the fitting to the pump. The ability of a concentric reducer to provide an improved approach flow to the pump while still allowing air to be transported through the fitting is investigated. Computational fluid dynamics (CFD) were utilised to analyse six concentric and six Eccentric reducer geometries at four different inlet velocities to determine the flow velocity distribution at the inlet to the pump. It was found that Eccentric Reducers with angles greater or equal to 15° and concentric Reducers with an angle greater or equal to 20° did not pass the assessment criteria related to the inlet conditions. Air could be hydraulically transported through all of the concentric Reducers modelled except for the 20° concentric reducer. A correctly designed concentric reducer will not only provide a more uniform velocity distribution in comparison to an Eccentric reducer, but will allow for the hydraulic transportation of air through the reducer.

  • Review of pump suction reducer selection : Eccentric or concentric Reducers : technical paper
    Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese, 2014
    Co-Authors: Sj Van Vuuren
    Abstract:

    Eccentric Reducers are traditionally recommended for the pump suction reducer fitting to allow for transportation of air through the fitting to the pump. The ability of a concentric reducer to provide an improved approach flow to the pump while still allowing air to be transported through the fitting is investigated. Computational fluid dynamics (CFD) were utilised to analyse six concentric and six Eccentric reducer geometries at four different inlet velocities to determine the flow velocity distribution at the inlet to the pump. It was found that Eccentric Reducers with angles greater or equal to 15° and concentric Reducers with an angle greater or equal to 20° did not pass the assessment criteria related to the inlet conditions. Air could be hydraulically transported through all of the concentric Reducers modelled except for the 20° concentric reducer. A correctly designed concentric reducer will not only provide a more uniform velocity distribution in comparison to an Eccentric reducer, but will allow for the hydraulic transportation of air through the reducer.

Sun-yi Chen - One of the best experts on this subject based on the ideXlab platform.

  • ELASTIC STRESSES AND LIMIT BENDING MOMENTS OF CONCENTRIC AND Eccentric Reducers SUBJECTED TO BENDING MOMENTS
    2015
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6 % more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1 % lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe

  • Elastic Stresses and Limit Bending Moments of Concentric and Eccentric Reducers Subjected to Bending Moments
    Volume 1: Codes and Standards, 2014
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6% more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1% lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe.Copyright © 2014 by ASME

Jin Chen - One of the best experts on this subject based on the ideXlab platform.

  • ELASTIC STRESSES AND LIMIT BENDING MOMENTS OF CONCENTRIC AND Eccentric Reducers SUBJECTED TO BENDING MOMENTS
    2015
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6 % more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1 % lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe

  • Elastic Stresses and Limit Bending Moments of Concentric and Eccentric Reducers Subjected to Bending Moments
    Volume 1: Codes and Standards, 2014
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6% more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1% lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe.Copyright © 2014 by ASME

Zhengdong Wang - One of the best experts on this subject based on the ideXlab platform.

  • ELASTIC STRESSES AND LIMIT BENDING MOMENTS OF CONCENTRIC AND Eccentric Reducers SUBJECTED TO BENDING MOMENTS
    2015
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6 % more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1 % lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe

  • Elastic Stresses and Limit Bending Moments of Concentric and Eccentric Reducers Subjected to Bending Moments
    Volume 1: Codes and Standards, 2014
    Co-Authors: Sun-yi Chen, Jin Chen, Zhengdong Wang, Chen Wang
    Abstract:

    In order to assess the safety of concentric Reducers and Eccentric Reducers, the meridian stress and circumferential stress of the Reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both Reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the Reducers. The value of limit bending moment of the Reducers is 14.6% more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the Reducers, the limit bending moment of the Reducers is 11.1% lower and the constant in the formula for the Reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric Reducers and Eccentric Reducers directly from the formula of limit bending moment for a thin wall pipe.Copyright © 2014 by ASME