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Research Papers: Design and Analysis

# Research on the Calculation Method of Tightening Torque on P-110S Threaded Connections

[+] Author and Article Information
Shou-Jun Chen

School of Mechanical and Power Engineering, East China University of Science and Technology, No. 130, Meilong Road, Xuhui District, Shanghai 200237, P. R. Chinacsj19850112@yahoo.com.cn

Qi An1

School of Mechanical and Power Engineering, East China University of Science and Technology, No. 130, Meilong Road, Xuhui District, Shanghai 200237, P. R. Chinaanqi@ecust.edu.cn

Yi Zhang

Wuxi Seamless Oil Pipe Co., Ltd., Wuxi 214028, P. R. China

Qiang Li

School of Mechanical and Power Engineering, East China University of Science and Technology, No. 130, Meilong Road, Xuhui District, Shanghai 200237, P. R. China

1

Corresponding author.

J. Pressure Vessel Technol 133(5), 051207 (Jul 14, 2011) (8 pages) doi:10.1115/1.4003464 History: Received April 28, 2010; Revised January 12, 2011; Published July 14, 2011; Online July 14, 2011

## Abstract

Tightening torque is one of the main factors that could affect the connection quality in threaded connections. On the basis of elastic mechanics and thick cylinder theory, this paper established a new analytical model based on the geometric parameters of thread tooth and the calculation method of tightening torque on P-110S threaded connections was also obtained by calculating the frictional torque on each threaded surface. In this paper, the friction coefficient on the real contact thread tooth was measured by the developed experimental equipment that could be used to simulate the contact of threaded surfaces approximately. By applying the new method on P-110S threaded connection and comparing the results obtained by analytical model with the true make-up torque in application, it could be found that the analytical model and the calculation method proposed in this paper are reasonable. The new method was also validated by using the finite element analysis method to the same sample. The new method proposed in this paper is practical and convenient because it can be applied to calculate the tightening torque just with geometric parameters and thread numbers, which is easier to implement in application.

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## Figures

Figure 1

The schematic of P-110S threaded connection

Figure 2

The schematic of thick cylinder theory

Figure 3

The schematic of contact tooth on pin and box with assumptions

Figure 9

The mechanism schematic of measurement on friction force

Figure 10

The relation of friction force and normal force

Figure 4

The schematic of contact threaded surfaces

Figure 5

The developed experimental equipment

Figure 6

The top and bottom samples

Figure 7

The mechanism schematic of experimental equipment

Figure 8

The schematic of the hydrostatic oil lubrication system

Figure 11

Frictional torque obtained by the proposed method under different tighten cycles: (a) N=2 and (b) N=2.5

Figure 12

Finite element model

Figure 13

The schematic of finite element model after cutting

Figure 14

Mesh on the finite element model

Figure 15

Mean contact pressure on oriented and loading flank obtained by FEA method: (a) N=2 and (b) N=2.5

Figure 16

Frictional torque obtained by analytical method and FEA method: (a) N=2 and (b) N=2.5

## Errata

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