US3485671A - Method of cleaning air supply systems and ducts - Google Patents
Method of cleaning air supply systems and ducts Download PDFInfo
- Publication number
- US3485671A US3485671A US602815A US3485671DA US3485671A US 3485671 A US3485671 A US 3485671A US 602815 A US602815 A US 602815A US 3485671D A US3485671D A US 3485671DA US 3485671 A US3485671 A US 3485671A
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- US
- United States
- Prior art keywords
- ducts
- air
- air supply
- cleaning
- supply systems
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
- B24C3/327—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/22—Cleaning ducts or apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/12—Pocket type filter
Definitions
- FIG. 1 is a view in perspective of apparatus suitably adapted for the practice of the subject method
- FIG. 2 is a view in cross-section of an air supply duct in the course of being cleaned by the process of the invention
- FIG. 3 illustrates to scale pieces of felt, a material suitable for use in the process of the invention.
- FIG. 4 is an enlarged detail view of the apparatus of FIG. 1.
- a typical air supply system for the heating and air conditioning of buildings comprises an air supply duct having ceiling outlets 12 and 14.
- air supply duct having ceiling outlets 12 and 14.
- ducts become laden over a period of time with wall deposits of dirt, dust, lint and the like, to the point where a clean-out operation is required.
- This operation is conventionally carried out manually with brushes and vacuuming equipment with considerable labor and expense.
- the cleaning method of the invention enables the cleaning of such ducts and duct systems quickly, efficiently and economically.
- an air and cleaning material handling system comprising conduit 16, separator 18, conduit 20, filter unit 22, conduit 24 and air evacuator unit 26.
- conduit 16 Disposed within sealed off air-receiving relation to outlet 14 is an air and cleaning material handling system comprising conduit 16, separator 18, conduit 20, filter unit 22, conduit 24 and air evacuator unit 26.
- outlet 12 Disposed within outlet 12 is the output end of a flexible conduit 28 which is adapted to introduce comminuted cleaning material 30 into duct 10, said material being fed from a hopper 32 by a feed blower 34.
- Separator 18 comprises a settling out chamber 35 and a collector 36 for the cleaning material 30, the dirt and dust laden air passing therefrom through conduit 20 to the filter unit 22.
- Filter unit 22 is of the dust arrester type, containing,
- Patented Dec. 23, 1969 for example, a multi-pocketed filter cloth 38, a vibrator bar 40, and a direct collection chamber 42.
- Filtered air passes through conduit 24 into chamber 44 and therefrom through discharge outlet 46.
- Chamber 44 contains one or more fans 48 mounted on shaft 50, the latter being driven by motor 52.
- the described apparatus withdraws air and the cleaning material entrained therein from duct 10 at a rate on the order of 3200 c.f.m., while blower 34 delivers air with entrained cleaning material at a rate on the order of 5G0700 c.f.m.
- a preferred cleaning material is walnut shells, preferably broken up to about the fineness of coarse sand.
- suitable materials for example, are felt, foam plastic and polystyrene of various particle sizes and shapes, such, for example, as shown in FIG. 3.
- the materials are sufficiently light in weight to be brought into contact over a relatively brief period of time with the entire internal surf-ace of the duct under the swirling, turbulent flow of air (FIG. 3) caused by the activity of fan 48 and feed blower 34.
- these materials have a hardness less than that of sheet aluminum and galvanized steel, materials of which air ducts are normally made, and hence they have a skidding, wiping action on the duct walls rather than a bouncing, abrading action, i.e.
- the specific gravity of comminuted w-alnut shells is just slightly greater than that of water, while the specific gravities of felt, foam plastic and polystyrene are substantially less than that of water.
- the specific material to be selected for any given duct cleaning job depends upon the following: the amount of wearing away action required to etfectcleaning; the air speed obtainable with the vacuum equipment used, such speed varying with changes in size of the air ducts; and the shape and contour of the air supply system, including fans, cooling coils and heating coils.
- the walnut shell material would be an appropriate selection.
- an appropriate selection would be a lighter material of the type of felt, foam plastic and polystyrene; felt or polystyrene being preferred where strong cleaning action is required; and foam plastic where a weaker cleaning action is called for.
- the anemostats, registers, fans, turn vanes and louvres forming parts of the air supply systems may be cleaned in place; and the air ducts can be cleaned without the necessity of putting a man in the false ceiling area to make access holes in the air ducts for cleaning, thereby avoiding risk of damage to the ceilmg.
- a process for removing wall deposits from an air supply system having air ducts of rectangular cross-sectional area on the order of one square foot comprising evacuating the air from a downstream station of said sys- 2,367,918 1/1945 Bartel 134-37 XR tern at a rate 011 the order of 3200 c.f.m. while blowing 2,426,072 8/1947 Wall et a1.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Cleaning In General (AREA)
Description
Dec. 23, 1969 STEPHENS I 3,485,671
METHOD OF CLEANING AIR SUPPLY SYSTEMS AND DUCTS Filed Dec. 19, 1966 2 Sheets-Sheet 1 IN VENTOR.
I nrmmsvs Dec. 23, 1969 5. R. STEPHENS METHOD OF CLEANING AIR SUPPLY SYSTEMS AND DUCTS Filed Dec. 19, 1966 2 Sheets-Sheet 2 \f I N VENTOR.
ATTOKNE Y5 United States Patent 3,485,671 METHOD OF CLEANING AIR SUPPLY SYSTEMS AND DUCTS George R. Stephens, Richmond, 'Calif., assignor to Food Products, Inc, Richmond, Calif., a corporation of California Filed Dec. 19, 1966, Ser. No. 602,815 Int. Cl. B08 9/06, /02
US. Cl. 134--7 1 Claim ABSTRACT OF THE DISCLOSURE The steps of rapidly withdrawing the air from a downstream station of air supply systems and air supply ducts while introducing into an upstream station thereof under a supra-atmospheric pressure a relatively finely divided material having a low specific gravity and a lesser hardness than the materials forming such supply systems and ducts.
SUMMARY OF THE INVENTION The removal from air supply systems and air supply ducts of wall deposits of dirt and dust without damage to such systems and ducts characterized by the high velocity flushing of the same with a finely divided light weight metal polishing solid entrained in air.
THE DRAWINGS FIG. 1 is a view in perspective of apparatus suitably adapted for the practice of the subject method;
FIG. 2 is a view in cross-section of an air supply duct in the course of being cleaned by the process of the invention;
FIG. 3 illustrates to scale pieces of felt, a material suitable for use in the process of the invention; and
FIG. 4 is an enlarged detail view of the apparatus of FIG. 1.
Referring to the drawings, a typical air supply system for the heating and air conditioning of buildings comprises an air supply duct having ceiling outlets 12 and 14. As is well known, such ducts become laden over a period of time with wall deposits of dirt, dust, lint and the like, to the point where a clean-out operation is required. This operation is conventionally carried out manually with brushes and vacuuming equipment with considerable labor and expense. The cleaning method of the invention enables the cleaning of such ducts and duct systems quickly, efficiently and economically.
Disposed in sealed off air-receiving relation to outlet 14 is an air and cleaning material handling system comprising conduit 16, separator 18, conduit 20, filter unit 22, conduit 24 and air evacuator unit 26. Disposed within outlet 12 is the output end of a flexible conduit 28 which is adapted to introduce comminuted cleaning material 30 into duct 10, said material being fed from a hopper 32 by a feed blower 34.
Separator 18 comprises a settling out chamber 35 and a collector 36 for the cleaning material 30, the dirt and dust laden air passing therefrom through conduit 20 to the filter unit 22.
Patented Dec. 23, 1969 for example, a multi-pocketed filter cloth 38, a vibrator bar 40, and a direct collection chamber 42.
Filtered air passes through conduit 24 into chamber 44 and therefrom through discharge outlet 46. Chamber 44 contains one or more fans 48 mounted on shaft 50, the latter being driven by motor 52.
The described apparatus withdraws air and the cleaning material entrained therein from duct 10 at a rate on the order of 3200 c.f.m., while blower 34 delivers air with entrained cleaning material at a rate on the order of 5G0700 c.f.m.
A preferred cleaning material is walnut shells, preferably broken up to about the fineness of coarse sand. Other suitable materials, for example, are felt, foam plastic and polystyrene of various particle sizes and shapes, such, for example, as shown in FIG. 3. The materials are sufficiently light in weight to be brought into contact over a relatively brief period of time with the entire internal surf-ace of the duct under the swirling, turbulent flow of air (FIG. 3) caused by the activity of fan 48 and feed blower 34. Also, these materials have a hardness less than that of sheet aluminum and galvanized steel, materials of which air ducts are normally made, and hence they have a skidding, wiping action on the duct walls rather than a bouncing, abrading action, i.e. such action as makes for maximum duct surface contact per particle per passage through the duct. Other necessary characteristics which the above-mentioned materials have are relatively small particle size and multiple points or sharp edges on the pieces or granules. It is only with a material having such properties and characteristics that the four corners of rectangular air ducts may be satisfactorily cleaned.
The specific gravity of comminuted w-alnut shells is just slightly greater than that of water, while the specific gravities of felt, foam plastic and polystyrene are substantially less than that of water.
The specific material to be selected for any given duct cleaning job depends upon the following: the amount of wearing away action required to etfectcleaning; the air speed obtainable with the vacuum equipment used, such speed varying with changes in size of the air ducts; and the shape and contour of the air supply system, including fans, cooling coils and heating coils. For example, with ducts of average cross-sectional area which require a strong wearing away action for cleaning, the walnut shell material would be an appropriate selection. For large size ducts, e.g those of two feet and more in width, an appropriate selection would be a lighter material of the type of felt, foam plastic and polystyrene; felt or polystyrene being preferred where strong cleaning action is required; and foam plastic where a weaker cleaning action is called for.
Among the specific advantages of the subject cleaning method are the following: the anemostats, registers, fans, turn vanes and louvres forming parts of the air supply systems may be cleaned in place; and the air ducts can be cleaned without the necessity of putting a man in the false ceiling area to make access holes in the air ducts for cleaning, thereby avoiding risk of damage to the ceilmg.
What is claimed is:
1. A process for removing wall deposits from an air supply system having air ducts of rectangular cross-sectional area on the order of one square foot comprising evacuating the air from a downstream station of said sys- 2,367,918 1/1945 Bartel 134-37 XR tern at a rate 011 the order of 3200 c.f.m. while blowing 2,426,072 8/1947 Wall et a1.
into an upstream station of said system at a rate on the 2,622,047 12/1952 Ayers 1347 order of 600 c.f.m. air having entrained cleaning material, 2,627,149 2/ 1953 Mac Cracken 134-7 XR said material being selected from the group Consisting of 5 2,948,092 8/1960 Fuller 51-320 XR Walnut shell, felt, foam plastic and polystyrene, said mate- 2,972,502 2/ 1961 Jennings et a1. 153 XR rial being in the form of relatively small particles of gen- 3,033,711 5/ 1962 Harding 134-7 erally irregular shape having relatively sharply defined 3,090,166 5/1963 Straub.
edges and points, said cleaning material skidding over the duct walls in a swirling, turbulent flow caused by the difl 0 MO S O, WOLK, Primary Examiner ferentlal between the air flow input and output rates. JOSEPH T. Z AT AR G A, AsSiStant EXaminer References Cited UNITED STATES PATENTS 2 0 7 94 7 1937 l l5 l5-3.5, 302; 51-320; 1348, 21
US. Cl. X.R.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US60281566A | 1966-12-19 | 1966-12-19 |
Publications (1)
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US3485671A true US3485671A (en) | 1969-12-23 |
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US602815A Expired - Lifetime US3485671A (en) | 1966-12-19 | 1966-12-19 | Method of cleaning air supply systems and ducts |
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Cited By (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2123297A1 (en) * | 1971-01-25 | 1972-09-08 | Pre George Du | |
US3719030A (en) * | 1971-03-12 | 1973-03-06 | Metokote Precision Inc | Plastic powder spraying recovery method and apparatus |
US3780502A (en) * | 1971-01-25 | 1973-12-25 | Nat Foundry Equip Co Inc | Collector apparatus |
US3824738A (en) * | 1972-11-01 | 1974-07-23 | W Hall | Pipe cleaning apparatus |
US3870489A (en) * | 1972-10-13 | 1975-03-11 | Myers Sherman Co | Air filter systems for debris collecting apparatus |
DE3143031A1 (en) * | 1981-10-30 | 1983-05-19 | Boris 8000 München Bilous | System for automatically removing dust which has settled in pipelines |
US4411705A (en) * | 1981-11-04 | 1983-10-25 | Reactor Services International, Inc. | For removing particles from a tube by means of a missile |
US4452169A (en) * | 1982-09-24 | 1984-06-05 | Shinich Matsuda | Reviving apparatus for fluid passages |
US4482392A (en) * | 1982-05-13 | 1984-11-13 | Union Carbide Corporation | Conduit cleaning process |
US4731125A (en) * | 1984-04-19 | 1988-03-15 | Carr Lawrence S | Media blast paint removal system |
US4759781A (en) * | 1987-03-09 | 1988-07-26 | Olson Robert P | Filtering and dust collecting apparatus |
WO1989004729A1 (en) * | 1987-11-25 | 1989-06-01 | Flynn Thomas S | Asbestos removal method and system |
US4917712A (en) * | 1988-11-22 | 1990-04-17 | Crigler Enterprises | Method and apparatus for filtering conditioned air and separating dust from reusable waste |
DE3901859A1 (en) * | 1989-01-23 | 1990-07-26 | Kessler & Luch Gmbh | Stabilised swirl flow |
US5020188A (en) * | 1989-08-04 | 1991-06-04 | J. F. Walton & Co., Inc. | Duct cleaning apparatus |
US5066335A (en) * | 1989-05-02 | 1991-11-19 | Ogilvie Mills Ltd. | Glass-like polysaccharide abrasive grit |
US5067504A (en) * | 1990-11-21 | 1991-11-26 | Coleman Iii Seab H | Asbestos collection and containment device |
WO1991018712A2 (en) * | 1990-06-05 | 1991-12-12 | Siemens Aktiengesellschaft | Process and device for decontaminating surfaces contaminated with radioactivity |
US5072487A (en) * | 1989-08-04 | 1991-12-17 | J. F. Walton & Co., Inc. | Duct cleaning apparatus |
DE4106820A1 (en) * | 1990-10-10 | 1992-04-16 | Edelhoff Polytechnik | Transportable industrial vacuum cleaning system - has suction unit with coarse and fine filter as cylinders, with platform, and support frame |
US5231804A (en) * | 1990-04-03 | 1993-08-03 | Stripping Technologies Inc. | Hose cleaning system |
US5311637A (en) * | 1993-03-22 | 1994-05-17 | Broussard Kenneth J | Vacuum apparatus for cleaning fireplace flues |
US5352275A (en) * | 1989-07-31 | 1994-10-04 | Cyclean, Inc. | Method of producing hot mix asphalt |
US5383973A (en) * | 1993-10-21 | 1995-01-24 | Adcs/Air Duct Cleaning Systems, Inc. | Method for cleaning heating, ventilating and air conditioning ducts |
US5472514A (en) * | 1992-04-08 | 1995-12-05 | Goodway Technologies Corporation | Duct cleaning method |
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US5584939A (en) * | 1994-01-18 | 1996-12-17 | Burlington Northern Railroad | Method for cleaning rail cars |
US5617609A (en) * | 1995-06-20 | 1997-04-08 | Bently; John F. | Air nozzle/flexible whip cleaning means for ductwork |
US5868858A (en) * | 1997-11-05 | 1999-02-09 | Creed; Bruce W. | Method and apparatus for cleaning heating air conditioning and ventilating ducts |
US6014790A (en) * | 1998-07-30 | 2000-01-18 | Smith; David A. | Ductwork cleaning system |
US6047714A (en) * | 1998-01-02 | 2000-04-11 | Akazawa; Yasumasa | Air intake passage cleaning method and its apparatus |
US6063151A (en) * | 1998-06-12 | 2000-05-16 | The Spencer Turbine Company | Mobile apparatus and method for clearing gas lines |
US6159257A (en) * | 1998-10-21 | 2000-12-12 | Adm Agri-Industries, Ltd. | Water-resistant, glass-like, polysaccharide abrasive grits and method of making same |
US6230359B1 (en) * | 1998-01-17 | 2001-05-15 | Yasumasa Akazawa | Air intake passage cleaning method and its apparatus |
US6350185B1 (en) * | 2000-02-09 | 2002-02-26 | Space Systems/Loral, Inc. | Grit blast nozzle for surface preparation of tube |
US6372052B1 (en) * | 1994-08-15 | 2002-04-16 | Edward A. Jones | Portable combustion-driven H.V.A.C. duct cleaning system |
US6569217B1 (en) | 2000-05-10 | 2003-05-27 | Thomas M. DeMarco | Industrial dust collector with multiple filter compartments |
US6640382B1 (en) | 2001-11-09 | 2003-11-04 | Filter-Medic, Llc | Mobile filter cleaning system |
US6739950B1 (en) | 2002-12-09 | 2004-05-25 | Joerg Kruse | Pipe renovating system and method |
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US20040187449A1 (en) * | 2003-03-27 | 2004-09-30 | Oneida Air Systems, Inc. | Dust collection system |
US20060191099A1 (en) * | 2005-02-28 | 2006-08-31 | Shop Vac Corporation | Dual-tank vacuum cleaner |
ES2259507A1 (en) * | 2004-03-23 | 2006-10-01 | Electricidad Telbi, S.L. | Aspiration and filtration system for use in air conduits, includes aspiration unit with high-pressure fan driven by speed regulator, and filtration unit provided with different filters arranged in succession |
US7160574B1 (en) | 2002-08-28 | 2007-01-09 | Pipe Restoration Technologies, Llc | Barrier coating corrosion control methods and systems for interior piping systems |
US20070128353A1 (en) * | 2002-08-28 | 2007-06-07 | Larry Gillanders | Methods and systems for coating and sealing inside piping systems |
US20070141252A1 (en) * | 2005-12-21 | 2007-06-21 | Jak Aklian | Method of Making a Newly Installed Plumbling System Renewable |
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USRE40697E1 (en) * | 2002-06-12 | 2009-04-07 | Sabic Innovative Plastics Ip B.V. | Method for making an aromatic polycarbonate |
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US20110048322A1 (en) * | 2002-08-28 | 2011-03-03 | Pipe Restoration Technologies, Llc | Methods and Systems for Abrasive Cleaning and Barrier Coating/Sealing of Pipes |
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US8696823B1 (en) | 2002-08-28 | 2014-04-15 | Pipe Restoration Technologies, Llc | Methods and systems for abrasive cleaning and barrier coating/sealing of pipes |
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US9611973B2 (en) | 2002-08-28 | 2017-04-04 | Pipe Restoration Technologies, Llc | Process for coating the interior surface of water service lines |
US20190150683A1 (en) * | 2017-11-22 | 2019-05-23 | Guido Valentini | Vacuum Cleaner |
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US2948092A (en) * | 1955-03-04 | 1960-08-09 | Lawrence J Fuller | Method for cleaning jet and gas turbine engines |
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Cited By (96)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2123297A1 (en) * | 1971-01-25 | 1972-09-08 | Pre George Du | |
US3780502A (en) * | 1971-01-25 | 1973-12-25 | Nat Foundry Equip Co Inc | Collector apparatus |
US3719030A (en) * | 1971-03-12 | 1973-03-06 | Metokote Precision Inc | Plastic powder spraying recovery method and apparatus |
US3870489A (en) * | 1972-10-13 | 1975-03-11 | Myers Sherman Co | Air filter systems for debris collecting apparatus |
US3824738A (en) * | 1972-11-01 | 1974-07-23 | W Hall | Pipe cleaning apparatus |
DE3143031A1 (en) * | 1981-10-30 | 1983-05-19 | Boris 8000 München Bilous | System for automatically removing dust which has settled in pipelines |
US4411705A (en) * | 1981-11-04 | 1983-10-25 | Reactor Services International, Inc. | For removing particles from a tube by means of a missile |
US4482392A (en) * | 1982-05-13 | 1984-11-13 | Union Carbide Corporation | Conduit cleaning process |
US4452169A (en) * | 1982-09-24 | 1984-06-05 | Shinich Matsuda | Reviving apparatus for fluid passages |
US4731125A (en) * | 1984-04-19 | 1988-03-15 | Carr Lawrence S | Media blast paint removal system |
US4759781A (en) * | 1987-03-09 | 1988-07-26 | Olson Robert P | Filtering and dust collecting apparatus |
WO1989004729A1 (en) * | 1987-11-25 | 1989-06-01 | Flynn Thomas S | Asbestos removal method and system |
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