In this study of flexible piping systems (0.6 to 6.6 Hz), it was shown that the fundamental mode was not always the most significant mode of vibration. This study also concluded that variations in support condition do not significantly influence response in terms of nodal stress, fundamental frequency, and contribution of higher modes. In terms of support stiffness, the ratio of the magnitude of the gap (the total of all the mechanical tolerances and deadbands in the snubber support system) to the magnitude of the support nodal displacement was found to be more important than the actual magnitude of the gap. Additionally, when the magnitude of the nodal displacement exceeded the gap magnitude by a factor of about five or more, support stiffness was found to remain relatively constant.

Issue Section:
Research Papers
Topics:
Piping systems, Displacement, Stiffness, Stress, Vibration
1.
Anderson
M. J.
,
Barta
D. A.
,
Lindquist
M. R.
,
Renkey
E. J.
, and
Ryan
J. A.
,
1985
, “
Damping in LMFBR Pipe Systems
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
107
, pp.
366
–
372
.
2.
ANSI/ASME, 1973, Power Plant Piping, American National Standards Institute. Standard ANSI/ASME B31.1.
3.
ADLPIPE, 1980, Static and Dynamic Pipe Design and Stress Analysis Input Preparation Manual, Arthur D. Little, Inc.
4.
Barta
D. A.
,
Anderson
M. J.
,
Severud
L. K.
, and
Lindquist
M. R.
,
1984
, “
Seismic Response and Damping Tests of Small Bore LMFBR Piping and Supports
,” Design of Elevated Temperature Piping,
ASME PVP
-Vol.
86
, pp.
119
–
125
.
5.
Chan
A. W.
, and
Chen
C. H.
,
1992
, “
Stiffness Representation of Pipe Supports—Who Needs It?
,” Seismic Engineering—1992,
ASME PVP
-Vol.
237-2
, pp.
203
–
206
.
6.
Chang
P. S. Y.
,
1986
, “
Effect of Lumped Mass and Support Stiffness on Pipe Seismic Response
,” System and Component Design and Qualification Methods,
ASME PVP
-Vol.
117
, pp.
73
–
88
.
7.
Chiba, T., Kobayashi, H., Kitamura, K., Ando, K., and Koyanagi, R., 1983, “An Experimental Study on Damping Characteristics of Mechanical Snubber for Nuclear Power Plant Piping Systems,” Transactions of the 7th International Conference on Structural Mechanics in Reactor Technology, Vol. K, pp. 311–318.
8.
EPRI, 1989, “Improved Criteria for Snubber Functional Testing,” Electric Power Research Institute, Report NP-6443, Palo Alto, CA., Chap. 4.
9.
Goodling
E. C.
,
1991
, “
Control of Pipeline Dynamics With Disk Spring Restraints
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
113
, pp.
332
–
336
.
10.
Gruner
P.
, and
Jonczyk
J.
,
1988
, “
Sensitivity of the Response of Piping Systems Due to Variations of Important Parameters
,” Seismic Engineering—1988,
ASME PVP
-Vol.
144
, pp.
25
–
30
.
11.
Hadjian
A. H.
,
Masri
S. F.
, and
Ellison
B.
,
1985
, “
Damping Variability in Piping Systems
,” Seismic and Dynamic Qualification Methods,
ASME PVP
-Vol.
100
, pp.
41
–
48
.
12.
Kotwicki
P. J.
,
Chang
K. C.
, and
Johnson
E. R.
,
1979
, “
Effects of Restraint Stiffness and Gap on the Dynamic Response of Piping Systems
,” Piping Restraint Effects on Piping Integrity,
ASME PVP
-
37
, pp.
91
–
106
.
13.
Lay
C.
,
Abu-Yasein
O. A.
,
Pickett
M. A.
,
Sinha
S. K.
, and
Madia
J.
,
1992
, “
Establishment of an Improved Criteria for Snubber Functional Testing
,”
ASME PVP
-Vol.
237-2
, pp.
179
–
193
.
14.
Lay
C.
,
Abu-Yasein
O. A.
,
Pickett
M. A.
,
Madia
J.
, and
Sinha
S. K.
,
1997
, “
The Influence of Support Hardware and Piping Seismic Response on Snubber Support Damping
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
119
, Nov., pp.
451
–
456
.
15.
Lin
C.-W.
,
1991
, “
Seismic Evaluation of Systems and Components
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
113
, pp.
273
–
283
.
16.
Lockau
J.
,
Haas
E.
, and
Steinwender
F.
,
1984
, “
The Influence of High-Frequency Excitation on Piping and Support Design
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
106
, pp.
177
–
187
.
17.
Mello
R. M.
, and
Pollono
L. P.
,
1979
, “
Evaluation of the Influence of Seismic Restraint Characteristics on Breeder Reactor Piping Systems
,” Piping Restraint Effects on Piping Integrity,
ASME PVP
-
37
, pp.
63
–
77
.
18.
Pace
R. M.
,
1987
, “
The Use of Seismic Stress Reclassification for Snubber Reduction
,” SEISMIC ENGINEERING—Recent Advances in Design, Analysis, Testing and Qualification Methods,
ASME PVP
-Vol.
127
, pp.
111
–
117
.
19.
Pickett
M. A.
,
Cunningham
D. J.
,
Sinha
S. K.
, and
Madia
J.
,
1987
, “
Application of the Ritz Averaging Method in the Analysis of the Seismic Performance of Piping Systems
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
109
, pp.
315
–
322
.
20.
Rao
C. K.
, and
Mirza
S.
,
1987
, “
Seismic Response of Flexibly Connected Piping Systems
,” SEISMIC ENGINEERING—Recent Advances in Design, Analysis, Testing and Qualification Methods,
ASME PVP
-Vol.
127
, pp.
309
–
314
.
21.
Seireg, A., 1969, Mechanical Systems Analysis, International Textbook Co., Scranton, PA, pp. 238–249.
22.
Severud
L. K.
,
Anderson
M. J.
, and
Barta
D. A.
,
1983
, “
Seismic Damping Factors of Small Bore Piping as Influenced by Insulation and Support Elements
,” Innovative Concepts in Power Piping Design,
ASME PVP
-Vol.
74
, pp.
179
–
185
.
23.
Shen
J. K.
,
Lee
H. M.
, and
Chern
C. Y.
,
1987
, “
Impact Analysis for Piping Restraint Gap Effect Under Dynamic Loading
,” SEISMIC ENGINEERING—Recent Advances in Design, Analysis, Testing and Qualification Methods,
ASME PVP
-Vol.
127
, pp.
81
–
88
.
This content is only available via PDF.
Copyright © 1997
 by The American Society of Mechanical Engineers
You do not currently have access to this content.