GB2116665A - Dynamic energy dissipating pipe support with pneumatic damper - Google Patents
Dynamic energy dissipating pipe support with pneumatic damper Download PDFInfo
- Publication number
- GB2116665A GB2116665A GB08203944A GB8203944A GB2116665A GB 2116665 A GB2116665 A GB 2116665A GB 08203944 A GB08203944 A GB 08203944A GB 8203944 A GB8203944 A GB 8203944A GB 2116665 A GB2116665 A GB 2116665A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- pipework
- air
- damper
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 6
- 238000005192 partition Methods 0.000 claims abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 3
- 238000013016 damping Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000002301 combined effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/0209—Telescopic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/22—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with one or more cylinders each having a single working space closed by a piston or plunger
- F16F9/26—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with one or more cylinders each having a single working space closed by a piston or plunger with two cylinders in line and with the two pistons or plungers connected together
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/58—Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/16—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe
- F16L3/20—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe allowing movement in transverse direction
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
An air damper comprises a rod 5 with flanges 1, which slides in a casing 2 with partitions, the flanges and the partitions cooperating to define intercommunicating chambers. The apparatus uses air as the damper fluid, thus eliminating leakage problems and expensive maintenance, normally associated with conventional energy dissipating oil dampers. The air damper can be used in conjunction with a linear or rotational spring and mass system, or a snubbing unit. Less costly maintenance and more effective reduction of stress levels in pipework, under dynamic conditions, can be expected using this method. The apparatus is particularly suitable for nuclear pipework applications. <IMAGE>
Description
SPECIFICATION
Dynamic energy dissipating pipe supper This invention relates to a method of dynamically supporting pipework and also to an apparatus therefor.
It is conventional practice to make provision for supporting pipework dynamically, where this is required by codes of practice and where pipework, plant and personnel safety and protection dictate that such measures be taken.
These dynamic supports are conventionally snubbers, stiffness dampers or energy dissipating o.
dampers. Under dynamic conditions, snubbers act as rigid supports, stiffness dampers act as sprung supports and oil dampers act as energy dissipating dampers. None of these support types is istended to offer any resistance to the movement of pipework under quasi-static conditions, e.g. thermal movements.
All these conventional types require regular expensive maintenance, yet, despite this, still suffer from practical problems. Snubbers and stiffness dampers suffer from locking problems under quasi-static conditions, and oil dampers suffer from leakage problems. These difficulties may render these devices ineffective when required to safeguard the integrity of pipework and plant, and protect
personnel in an emergency.
It is an object of the present invention to provide a
method and an apparatus to overcome all or some of the described problems and to satisfy all the neces saryfunctions in a more reliable, more effective and
less costly way.
According to the present invention a method of
dynamically supporting pipework comprises an
energy dissipating damper and either a linear spring
plus mass system, a stiffness damper or a snubber.
According to another aspect of the present invention, the method to employ makes use of air as the fluid in the damper, thus eliminating leakage problems and expensive maintenance.
The method of using air dampers can, in addition, be combined with conventional methods to improve their performance.
According to a further aspect of the present invention an apparatus for dynamically supporting pipework comprises an air damper, associated with either a spring and mass damper or a locking link.
Either combination allows the air damper to be automatically set for any static configuration of the pipework.
The spring and mass damper is preferably of the linear rather than rotary type as this avoids the problem of quasi-static locking of the linear to rotary motion conversion mechanism. The apparatus can be designed to optimize the effect of damping or the combined effect of damping, stiffness and mass inertia, for a range of systems and operating conditions.
The invention is illustrated with reference to the accompanying drawings. Figure 1 is a schematic cross-section of an apparatus comprising an air damper, its self locating spring 3, and a linear spring and mass. Figure 2 is a schematic cross-section of an alternative arrangement, comprising an air damper, its self locating spring 3, and either a rotational spring and mass or a dynamically locking link 4. In either arrangement, end 5 is connected to the pipework, and end 6 to supporting framework.
In the apparatus illustrated in Figure 1,the desired performance is achieved by varying: stiffness of spring 3, air passages between chambers 10; number of pairs of chambers; diameter of flange 1; mass 4; and total travel of casing 2 and 4 within casing 7.
In the apparatus illustrated in Figure 2, the characteristics of the rotational spring and mass, or of the snubber, will also contribute to the overall performance of the apparatus.
In operation, end 5 is moved by pipework and compresses spring 3. Flange 1, then moves to compress air in chamber 8 and expand air in chamber 9. Air is thus forced through passages 10 from chamber 8 to chamber 9. Similarly for all other pairs of chambers in apparatus. This has the effect of dissipating energy in both directions of movement.
Spring 3 locates flange 1 relative to casing 2. In
Figure 1, casing 2 and mass 4 slide relative to casing 7. Spring 3 operates both in compression and in tension.
This method and apparatus are particularly suitable for nuclear pipework applications.
An air damper comprising a casing with a plurality of internal partitions, a rod with a plurality of flanges which slides within the casing and which togetiler with the casing partitions form pairs of chambers, with communicating air passages and a spring for locating the flanges relative to the casing.
2. An apparatus comprising an air chamber as claimed in 1 plus a linear spring and mass.
3. An apparatus comprising an air chamber as claimed in 1 used in conjunction with a stiffness damper, or a snubber or any other conventional support of similar nature.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (3)
- **WARNING** start of CLMS field may overlap end of DESC **.SPECIFICATION Dynamic energy dissipating pipe supper This invention relates to a method of dynamically supporting pipework and also to an apparatus therefor.It is conventional practice to make provision for supporting pipework dynamically, where this is required by codes of practice and where pipework, plant and personnel safety and protection dictate that such measures be taken.These dynamic supports are conventionally snubbers, stiffness dampers or energy dissipating o.dampers. Under dynamic conditions, snubbers act as rigid supports, stiffness dampers act as sprung supports and oil dampers act as energy dissipating dampers. None of these support types is istended to offer any resistance to the movement of pipework under quasi-static conditions, e.g. thermal movements.All these conventional types require regular expensive maintenance, yet, despite this, still suffer from practical problems. Snubbers and stiffness dampers suffer from locking problems under quasi-static conditions, and oil dampers suffer from leakage problems. These difficulties may render these devices ineffective when required to safeguard the integrity of pipework and plant, and protect personnel in an emergency.It is an object of the present invention to provide a method and an apparatus to overcome all or some of the described problems and to satisfy all the neces saryfunctions in a more reliable, more effective and less costly way.According to the present invention a method of dynamically supporting pipework comprises an energy dissipating damper and either a linear spring plus mass system, a stiffness damper or a snubber.According to another aspect of the present invention, the method to employ makes use of air as the fluid in the damper, thus eliminating leakage problems and expensive maintenance.The method of using air dampers can, in addition, be combined with conventional methods to improve their performance.According to a further aspect of the present invention an apparatus for dynamically supporting pipework comprises an air damper, associated with either a spring and mass damper or a locking link.Either combination allows the air damper to be automatically set for any static configuration of the pipework.The spring and mass damper is preferably of the linear rather than rotary type as this avoids the problem of quasi-static locking of the linear to rotary motion conversion mechanism. The apparatus can be designed to optimize the effect of damping or the combined effect of damping, stiffness and mass inertia, for a range of systems and operating conditions.The invention is illustrated with reference to the accompanying drawings. Figure 1 is a schematic cross-section of an apparatus comprising an air damper, its self locating spring 3, and a linear spring and mass. Figure 2 is a schematic cross-section of an alternative arrangement, comprising an air damper, its self locating spring 3, and either a rotational spring and mass or a dynamically locking link 4. In either arrangement, end 5 is connected to the pipework, and end 6 to supporting framework.In the apparatus illustrated in Figure 1,the desired performance is achieved by varying: stiffness of spring 3, air passages between chambers 10; number of pairs of chambers; diameter of flange 1; mass 4; and total travel of casing 2 and 4 within casing 7.In the apparatus illustrated in Figure 2, the characteristics of the rotational spring and mass, or of the snubber, will also contribute to the overall performance of the apparatus.In operation, end 5 is moved by pipework and compresses spring 3. Flange 1, then moves to compress air in chamber 8 and expand air in chamber 9. Air is thus forced through passages 10 from chamber 8 to chamber 9. Similarly for all other pairs of chambers in apparatus. This has the effect of dissipating energy in both directions of movement.Spring 3 locates flange 1 relative to casing 2. In Figure 1, casing 2 and mass 4 slide relative to casing 7. Spring 3 operates both in compression and in tension.This method and apparatus are particularly suitable for nuclear pipework applications.An air damper comprising a casing with a plurality of internal partitions, a rod with a plurality of flanges which slides within the casing and which togetiler with the casing partitions form pairs of chambers, with communicating air passages and a spring for locating the flanges relative to the casing.
- 2. An apparatus comprising an air chamber as claimed in 1 plus a linear spring and mass.
- 3. An apparatus comprising an air chamber as claimed in 1 used in conjunction with a stiffness damper, or a snubber or any other conventional support of similar nature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08203944A GB2116665A (en) | 1982-02-11 | 1982-02-11 | Dynamic energy dissipating pipe support with pneumatic damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08203944A GB2116665A (en) | 1982-02-11 | 1982-02-11 | Dynamic energy dissipating pipe support with pneumatic damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2116665A true GB2116665A (en) | 1983-09-28 |
Family
ID=10528247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08203944A Withdrawn GB2116665A (en) | 1982-02-11 | 1982-02-11 | Dynamic energy dissipating pipe support with pneumatic damper |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2116665A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0214754A1 (en) * | 1985-08-26 | 1987-03-18 | Unisys Corporation | Telescoping strut shock isolator |
| CN111810758A (en) * | 2020-08-05 | 2020-10-23 | 西安热工研究院有限公司 | A protective device against pipeline impact |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB685591A (en) * | 1950-01-30 | 1953-01-07 | Robert Strahm | Improvements in and relating to brakes using a liquid energy absorbing medium |
| GB998227A (en) * | 1962-06-19 | 1965-07-14 | Stabilus Ind Handels Gmbh | Pneumatic spring |
| GB1070815A (en) * | 1964-08-07 | 1967-06-07 | Atomic Energy Commission | Damped bearing for centrifuges |
| GB1175255A (en) * | 1967-10-18 | 1969-12-23 | Nuclear Power Group Ltd | Improvements in or relating to Dash Pots. |
| GB1259159A (en) * | 1969-07-23 | 1972-01-05 | ||
| GB1370671A (en) * | 1970-12-17 | 1974-10-16 | Aerospatiale | Double-acting short-stroke hydraulic dampers |
| GB1602325A (en) * | 1977-04-07 | 1981-11-11 | Int Vibration Engineer | Inertia appartus for authorizing an blocking the movement between two members |
-
1982
- 1982-02-11 GB GB08203944A patent/GB2116665A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB685591A (en) * | 1950-01-30 | 1953-01-07 | Robert Strahm | Improvements in and relating to brakes using a liquid energy absorbing medium |
| GB998227A (en) * | 1962-06-19 | 1965-07-14 | Stabilus Ind Handels Gmbh | Pneumatic spring |
| GB1070815A (en) * | 1964-08-07 | 1967-06-07 | Atomic Energy Commission | Damped bearing for centrifuges |
| GB1175255A (en) * | 1967-10-18 | 1969-12-23 | Nuclear Power Group Ltd | Improvements in or relating to Dash Pots. |
| GB1259159A (en) * | 1969-07-23 | 1972-01-05 | ||
| GB1370671A (en) * | 1970-12-17 | 1974-10-16 | Aerospatiale | Double-acting short-stroke hydraulic dampers |
| GB1602325A (en) * | 1977-04-07 | 1981-11-11 | Int Vibration Engineer | Inertia appartus for authorizing an blocking the movement between two members |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0214754A1 (en) * | 1985-08-26 | 1987-03-18 | Unisys Corporation | Telescoping strut shock isolator |
| CN111810758A (en) * | 2020-08-05 | 2020-10-23 | 西安热工研究院有限公司 | A protective device against pipeline impact |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |