GB2132746A - Apparatus and method for vibrating powder in a tank - Google Patents
Apparatus and method for vibrating powder in a tank Download PDFInfo
- Publication number
- GB2132746A GB2132746A GB08332770A GB8332770A GB2132746A GB 2132746 A GB2132746 A GB 2132746A GB 08332770 A GB08332770 A GB 08332770A GB 8332770 A GB8332770 A GB 8332770A GB 2132746 A GB2132746 A GB 2132746A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vibrator
- interspace
- assembly
- vibrator assembly
- tank
- 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- Withdrawn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
- 239000000843 powder Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 11
- 238000009413 insulation Methods 0.000 claims description 9
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 235000019362 perlite Nutrition 0.000 abstract description 13
- 239000010451 perlite Substances 0.000 abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 239000011150 reinforced concrete Substances 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
- E04B1/7604—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only fillings for cavity walls
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
An apparatus for vibrating powder in a tank and in particular a tank constructed of an outer shell 1 of reinforced concrete and an inner tank 2 formed of nickel steel comprises a vibrating assembly 8 constructed of a T-shaped frame to which is attached a vibratable plate. Securely located on the top of the frame is a vibrator of the electric motor type whereby a motor drives an out-of-balance shaft. In operation the vibrator assembly 8 is lowered into the interspace, the interspace is partially filled with perlite 16, the vibrator is energised to vibrate the plate so as to settle the perlite and the vibrator assembly is raised and further perlite added until the interspace is filled. <IMAGE>
Description
SPECIFICATION
Apparatus and method for vibrating powder in a tank
This invention relates to an apparatus and a method for vibrating powder and more particularly for vibrating expanded perlite loose fill insulation disposed in an interspace of a double skin storage tank.
Double skin storage tanks are well known and are typically used for storage of low temperature (cryogenic) liquids, such as liquid oxygen, nitrogen, natural gas (methane), ethylene, ethane, etc.
In one known storage tank, the outer shell is made of carbon steel whilst the inner tank is made of aluminium, stainless steel or a low temperature nickel steel. The outer shell of such tanks is typically 20 to 60 metres in diameter and 20 to 40 metres high, with an inner tank 2 to 4 metres smaller, thereby leaving an annular space of 1 to 2 metres.
The interspace is usually filled with an insulating material, usualy expanded perlite, which is a granular material. The perlite is poured or pumped into place from the top and hence it contains a considerable amount of entrained air. Over a period of time the entrained air will be released and under the influence of seismic and other vibrations the granules of perlite will settle closer together with a resultant fall in the level of ferrite, thus giving rise to a void in the insulation at the top of the tank.
It will be realised that the rate of natural settlement is relatively slow and unless steps are taken to bring about most of the settlement at the time of installing the perlite, then it will be necessary to carry out a "topping up" operation a year or two after the initial filling. Such accelerated settlement has been achieved in the known tank by attaching vibrator units to the exterior of the outer shell to thereby vibrate the whole tank either during or after filling.
In recent years a number of tanks have been constructed in which the outer shell is of reinforced concrete which cannot be vibrated and for various reasons, it has been found not feasible or permissible to vibrate the inner tank. To date therefore, as far as the present applicants are aware, there has been no apparatus or method available to achieve accelerated settlement of the pqwer insulation in tanks with concrete outer shells.
The present invention seeks to provide an apparatus and method for use with storage tanks having a concrete outer shell, whereby the rate of settlement of insulating powder is accelerated.
According to one aspect of this invention there is provided an apparatus for vibrating loose fill insulation powder disposed in an interspace of a double skin storage tank including a vibrator assembly comprising a vibrator mounted to a place means for vibrating the plate means at a desired frequency and at least one lifting lug attached to the plate means for permitting the vibrator assembly to be raised during filling of the tank by said powder.
According to a further aspect of this invention, there is provided a method of vibrating by a vibrator assembly loose fill insulation powder in an interspace of a double skin storage tank in which the vibrator assembly comprises a vibrator mounted to a plate means and at least one lifting lug attached to the. plate means comprising the steps of lowering the vibrator assembly into the interspace, at least partially covering the vibrator assembly with insulation powder, actuating the vibrator assembly at a desired frequency, and raising the vibrator assembly in the tank such that the insulating powder in the interspace is vibrated whereby the rate of settlement of the powder in the interspace is accelerated.
In some tanks it is preferred to at least partially cover the vibrator assembly, vibrate the powder, raise the vibrator assembly, and again partially cover the vibrator assembly in successive steps until the interspace is filled.
Preferably a jockey winch is provided to lower and raise the vibrator assembly by said lug or lugs.
In a preferred embodiment a plurality of vibrator assemblies are disposed around the interspace of the tank.
Advantageously, the plate means comprises a T-shaped frame to the top of which is mounted a vibrator and to the depending limb of which is secured a plate which plate is preferably made from mild steel. Preferably means are provided to adjust the mass and position of the vibrator on the plate means to thereby tune the vibrator assembly to the desired resonant frequency.
Preferably each vibrator assembly is suspended through a filling aperture of the interspace.
The vibrator may be an electric motor type whereby a motor drives an out-of-balance shaft or an oscillating pneumatic piston type.
The invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 shows a schematic vertical crosssection through a tank utilising the present invention; and
Figures 2(a) and 2(b) show mutually perpendicular views of a vibrator assembly for use in the tank of Fig. 1.
In the Figs. like reference numerals denote like parts.
Referring to Fig. 1, a double skin storage tank has a circular cross-section with an outer shell 1 formed from reinforced concrete material and an inner tank 2 formed of nickel steel. The outer shell has a domed roof 3.
Mounted on the domed roof of the outer shell, above the interspace 4, between the walls of the outer shell 1 and inner tank 2, are a number of circumferentially spaced perlite filling inlets 5 to the upper side of which is attached a jockey winch 6 (only one being shown for clarity). A steel wire cable 7 of the winch is connected to a vibrator assembly 8.
The vibrator assembly 8 shown more particularly in Figs. 2(a) and 2(b) has a mild steel
T-shaped frame formed by a top limb 9 supported on a depending limb 10 by brackets 11. The top limb 9 is welded to the limb 10 and brackets 11 to form a platform for a mechanical vibrator 1 2 of the electric motor type whereby a motor drives an out of balance shaft. Such a vibrator is that made by
Grantham Electrical Engineering Company Ltd under their Type No. BX 924/4. Also mounted on the plate 9 are two lifting lugs 1 3 for attachment to the winch cable 7. The vertical limb 10 of the frame supports a mild steel plate 14 which is secured to the depending limb 10 of the frame by bolts 1 5.
In operation, the vibrator assemblies 8 are lowered to the bottom of the interspace 4 before perlite filling commences through inlet 5 and perlite 1 6 is then added sufficient to just cover the assemblies 8, although it is, of course, not necessary that the assembly be completely submerged in perlite. Filling is discontinued and the vibrators are activated until settlement is achieved after which the vibrators are raised just clear of the compacted perlite and the procedure is repeated successively until the annular interspace of the tank is filled.
By the present invention it will therefore be understood that an apparatus and a method is disclosed by which an insulating material may be settled at an accelerated rate without the necessity of vibrating the walls of the tank.
Although the vibrator disclosed in the preferred embodiment is of the electric motor type it may alternatively be of the oscillating pneumatic piston type.
Furthermore, provision is made on the Tshaped frame to adjust the mass and the position of the vibrator 1 2-or the size and rigidity of the plate 14-to tune the assembly so as to achieve the desired frequency to suit a particular application.
In an example of the vibrator, the plate 1 4 had equal sides of 1.2 metre in length and the distance from the top of the plate 9 to the top of the vibrator 1 2 was 0.75 metres. A plate 14 of 2.4 metre length sides has also been constructed and used by the applicants.
It will be appreciated that an L-shaped frame may also be employed with only one lifting lug but such a shape is not preferred since the plate 14 when supported by such a frame tends not to hang vertically.
Claims (11)
1. An apparatus for vibrating loose fill insulation powder disposed in an interspace of a double skin storage tank including a vibrator assembly comprising a vibrator mounted to a plate means for vibrating the plate means at a desired frequency and at least one lifting lug attached to the plate means for permitting the vibrator assembly to be raised during filling of the tank by said powder.
2. An apparatus as claimed in Claim 1 wherein a jockey winch is provided to lower and raise the vibrator assembly by said lug or lugs.
3. An apparatus as claimed in Claim 1 or 2 wherein a plurality of vibrator assemblies are disposed around the interspace of the tank.
4. An apparatus as claimed in any preceding claim wherein the plate means comprises a T-shaped frame to the top of which is mounted a vibrator and to the depending limb of which is secured a plate.
5. An apparatus as claimed in Claim 4 wherein which plate is preferably made from mild steel.
6. An apparatus as claimed in any preceding claim wherein means are provided to adjust the mass and position of the vibrator on the plate means to thereby tune the vibrator assembly to the desired resonant frequency.
7. An apparatus as claimed in any preceding claim wherein each vibrator assembly is suspended through a filling aperture of the interspace.
8. An apparatus as claimed in any preceding claim wherein the vibrator is an electric motor type whereby a motor drives an out-ofbalance shaft or an oscillating pneumatic piston type.
9. A method of vibrating by a vibrator assembly loose fill insulation powder in an interspace of a double skin storage tank in which the vibrator assembly comprises a vibrator mounted to a plate means and at least one lifting lug attached to the plate means comprising the steps of lowering the vibrator assembly into the interspace, at least partially covering the vibrator assembly with insulation powder, actuating the vibrator assembly at a desired frequency, and raising the vibrator assembly in the tank such that the insulating powder in the interspace is vibrated whereby the rate of settlement of the powder in the interspace is accelerated.
10. A method as claimed in Claim 9 wherein the vibrator assembly is at least partially covered, the powder is vibrated, the assembly raised, and the assembly again partially covered in successive steps until the interspace is filled.
11. An apparatus substantially as herein described with reference to and as shown in the accompanying drawings.
1 2. A method as claimed in Claim 9 and substantially as herein described with reference to and as shown in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8235116 | 1982-12-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8332770D0 GB8332770D0 (en) | 1984-01-18 |
| GB2132746A true GB2132746A (en) | 1984-07-11 |
Family
ID=10534845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08332770A Withdrawn GB2132746A (en) | 1982-12-09 | 1983-12-08 | Apparatus and method for vibrating powder in a tank |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2132746A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB511099A (en) * | 1937-08-21 | 1939-08-14 | Auguste Goditiabois | New or improved portable vibrating apparatus |
| GB622709A (en) * | 1946-08-15 | 1949-05-05 | Chicago Pneumatic Tool Co | Improvements in or relating to percussive tools |
| GB1594327A (en) * | 1977-10-27 | 1981-07-30 | Bosch Gmbh Robert | Internal vibrator |
-
1983
- 1983-12-08 GB GB08332770A patent/GB2132746A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB511099A (en) * | 1937-08-21 | 1939-08-14 | Auguste Goditiabois | New or improved portable vibrating apparatus |
| GB622709A (en) * | 1946-08-15 | 1949-05-05 | Chicago Pneumatic Tool Co | Improvements in or relating to percussive tools |
| GB1594327A (en) * | 1977-10-27 | 1981-07-30 | Bosch Gmbh Robert | Internal vibrator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8332770D0 (en) | 1984-01-18 |
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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) |