Abstract
Pipe flange connections have been used in chemical plants, petro-chemical industry and so on. They are tightened with a lot of bolts and nuts by torque wrench, impact wrench and so on. When the impact wrench is used for tightening a lot of bolts and nuts in pipe flange connection with gaskets, it is well known that a large scatter is assumed to occur in tightening the lots of bolts in the connection using the impact wrench. In the present paper, the scatter in bolt preloads in a pipe flange connection with 20" nominal diameter using impact wrenches was measured. The ratio of the maximum and the minimum bolt force is called the tightening coefficient. The tightening coefficient is calculated taking into account the interference of the adjacent bolts. The value of the coefficient is compared with the measured results obtained from torque wrench tightening. Then, FEM calculation for analyzing the gasket stress distribution in the process of bolt tightening is carried out. Using the obtained gasket stress distribution and the data obtained from the fundamental gasket characteristics, an amount of leakage is estimated. In addition, the bubble leak testing was carried out. The estimated result is in a fairly good agreement with the measured result. Discussion is made on the tightening coefficient by impact wrenches and the effect of the scatter in bolt preloads on the sealing performance.
| Original language | English |
|---|---|
| Title of host publication | ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 |
| Pages | 481-489 |
| Number of pages | 9 |
| Volume | 3 |
| Publication status | Published - 2011 |
| Externally published | Yes |
| Event | ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 - Denver, CO, United States Duration: Nov 11 2011 → Nov 17 2011 |
Other
| Other | ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 |
|---|---|
| Country | United States |
| City | Denver, CO |
| Period | 11/11/11 → 11/17/11 |
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ASJC Scopus subject areas
- Mechanical Engineering
Cite this
Scatter of bolt preloads in pipe flange connection tightened by impact wrench and the effect on sealing performance. / Kondo, Koji; Omiya, Yuya; Kobayashi, Takashi; Sawa, Toshiyuki.
ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011. Vol. 3 2011. p. 481-489.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Scatter of bolt preloads in pipe flange connection tightened by impact wrench and the effect on sealing performance
AU - Kondo, Koji
AU - Omiya, Yuya
AU - Kobayashi, Takashi
AU - Sawa, Toshiyuki
PY - 2011
Y1 - 2011
N2 - Pipe flange connections have been used in chemical plants, petro-chemical industry and so on. They are tightened with a lot of bolts and nuts by torque wrench, impact wrench and so on. When the impact wrench is used for tightening a lot of bolts and nuts in pipe flange connection with gaskets, it is well known that a large scatter is assumed to occur in tightening the lots of bolts in the connection using the impact wrench. In the present paper, the scatter in bolt preloads in a pipe flange connection with 20" nominal diameter using impact wrenches was measured. The ratio of the maximum and the minimum bolt force is called the tightening coefficient. The tightening coefficient is calculated taking into account the interference of the adjacent bolts. The value of the coefficient is compared with the measured results obtained from torque wrench tightening. Then, FEM calculation for analyzing the gasket stress distribution in the process of bolt tightening is carried out. Using the obtained gasket stress distribution and the data obtained from the fundamental gasket characteristics, an amount of leakage is estimated. In addition, the bubble leak testing was carried out. The estimated result is in a fairly good agreement with the measured result. Discussion is made on the tightening coefficient by impact wrenches and the effect of the scatter in bolt preloads on the sealing performance.
AB - Pipe flange connections have been used in chemical plants, petro-chemical industry and so on. They are tightened with a lot of bolts and nuts by torque wrench, impact wrench and so on. When the impact wrench is used for tightening a lot of bolts and nuts in pipe flange connection with gaskets, it is well known that a large scatter is assumed to occur in tightening the lots of bolts in the connection using the impact wrench. In the present paper, the scatter in bolt preloads in a pipe flange connection with 20" nominal diameter using impact wrenches was measured. The ratio of the maximum and the minimum bolt force is called the tightening coefficient. The tightening coefficient is calculated taking into account the interference of the adjacent bolts. The value of the coefficient is compared with the measured results obtained from torque wrench tightening. Then, FEM calculation for analyzing the gasket stress distribution in the process of bolt tightening is carried out. Using the obtained gasket stress distribution and the data obtained from the fundamental gasket characteristics, an amount of leakage is estimated. In addition, the bubble leak testing was carried out. The estimated result is in a fairly good agreement with the measured result. Discussion is made on the tightening coefficient by impact wrenches and the effect of the scatter in bolt preloads on the sealing performance.
UR - http://www.scopus.com/inward/record.url?scp=84869187328&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84869187328&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9780791854891
VL - 3
SP - 481
EP - 489
BT - ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
ER -