GB2195920A - Coating internal surfaces of pumps - Google Patents

Coating internal surfaces of pumps Download PDF

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Publication number
GB2195920A
GB2195920A GB08722581A GB8722581A GB2195920A GB 2195920 A GB2195920 A GB 2195920A GB 08722581 A GB08722581 A GB 08722581A GB 8722581 A GB8722581 A GB 8722581A GB 2195920 A GB2195920 A GB 2195920A
Authority
GB
United Kingdom
Prior art keywords
resin
pump
coating
selected areas
internal surfaces
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Withdrawn
Application number
GB08722581A
Other versions
GB8722581D0 (en
Inventor
John Hugh Kenyon Elvidge
Charles John Watkinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CORROCOAT Ltd
Original Assignee
CORROCOAT Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GB868623395A external-priority patent/GB8623395D0/en
Application filed by CORROCOAT Ltd filed Critical CORROCOAT Ltd
Priority to GB08722581A priority Critical patent/GB2195920A/en
Publication of GB8722581D0 publication Critical patent/GB8722581D0/en
Publication of GB2195920A publication Critical patent/GB2195920A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4286—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F05D2300/13—Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
    • F05D2300/133—Titanium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/44—Resins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/611—Coating

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The operating efficiency of a liquid transportation system, eg a pump for a local authority water pumping station is increased by the application to at least selected areas of internal surfaces of a layer of a resin which provides a smooth surface finish and which is not wetted by the liquid to be transported. The resin coating may be an epoxy resin which includes less than 0.5% by volume of a pigment.

Description

SPECIFICATION Liquid transportation systems Field of the invention This invention relates to liquid transportation systems and is specifically concerned with a method of improving the operating efficiency of a liquid transportation system comprising pump means and interconnected conduit means.
One area in which the invention is capable of application is in the field of water supply systems operated in England by the Regional Water Authorities.
It has long been recognised that one of the major areas of any Water Authority's operations where there is a potential for obtaining improved efficiencies is that of water pumping. Good station design, and the use of mechanical and electrical plant with high efficiency are obvious initial responses to the overall requirement for cost control. High efficiency motors for large installations are ofter specified as a standard requirement despite the initial capital cost to try to maintain overall efficiency for as long as possible after commissioning. Dramatic reductions in efficiencies are, however, often only highlighted during periodic examination and testing of a pumping station, and small gradual reductions in efficiency will usually remain undetected for many years but can contribute significantly to an overall loss of efficiency.
It is an object of the present invention to provide a method of improving the operating efficiency of a liquid transportation system, which method is of particular application, but is not limited to, water supply systems.
Summary of the invention According to a first aspect of the present invention there is provided a method of improving the operating efficiency of a liquid transportation system comprising pump means and interconnected conduit means, wherein at least selected areas of the internal surfaces of the pump means and/or the conduit means are coated with a layer of a resin the characteristics of which are such that: (a) a smooth surface finish is obtained, and (b) globules of the liquid coming into contact with the resin surface have a high angular contact with the resin surface whereby substantially no wetting is obtained, the application of the coating to the selected areas of the pump means and/or the conduit means being effected for a primary purpose, ie to improve the liquid flow efficiency of the system, other than that of repairing said selected areas.
The coating may be applied when the components of the system are new, before they have been used to any appreciable extent, or after they have been used to an extent where some but not all of the liquid-contacting surfaces are in need of repair. The coating is applied primarily, however, over at least a significant part of such surfaces for a reason or reasons other than that said parts of said surfaces are in need of repair.
It is known to repair the internal fluidtransmitting passageways of, for example, cast iron pump casings which have been eroded or corroded in use by building up the worn away portions with several successively applied layers of a time-hardening resin-based coating impregnated with glass flakes. It is self-evident that the efficiency of the re-assembled pump will be improved after such repair, because the pressurized water or other fluid will flow more efficiently around the repaired areas. It might be assumed-although it is not necessarily self-evident-that the efficiency of such a repaired unit would approach the efficiency of the unit when new.Although such coatings have been known and used for the purposes of repair for a number of years, it has never been suggested that they might be used for a primary purpose other than that of repair of a badly worn component after the component has been in use for a considerable period of time. Indeed such coatings have normally only been resorted to only when the component in question has been used for so long and/or under such extreme conditions that its scrapping and replacement with an entirely new component is the only alternative to an attempted repair with a resin-based coating as mentioned above.
The invention, by contrast, embodies the quite new realization that the fluid transmitting efficiency of components of the kind under consideration can be improved, even as compared to their "as new" ex-works state, by coating at least selected areas of the internal surfaces of said components with an appropriate coating.
According to another aspect of the present invention there is provided a pump or liquid transportation system at least selected areas of the internal surfaces of which have been coated by the method defined above.
The resin may be an epoxy resin which incorporates a pigment, the volume of the pigment being less than 2%, and preferably less than 0.5%, of the volume of the resin. If the percentage pigment is increased, the degree of wetting of the resin surface by the liquid will normally also increase. The percentage pigment will accordingly be so chosen that it is close to the minimum required to obtain a predetermined degree of opacity of the coating. The preferred pigment is titanium dioxide.
The epoxy resin may be obtained by the condensation of diglycidyl ether with Bisphenol A in the presence of an aromatic amine adduct as curing agent. The characteristics of the epoxy resin may be modified by the inclusion therein of, for example, polytetrafluoroe thylene powder or polyethylene wax.
Tests which are currently being carried out have indicated that, for a pumping station for a typical local water authority, an increased operating efficiency can be obtained which can be directly translated into a cost saving by an appropriate reduction of the overall power consumption of the pumping station.
Description of the Preferred Embodiments A resin coating was applied to the pump suction bell mouth, bowls, guide vanes and dummy stage of a three-stage high-lift pump to be installed in regional water authority pumping station, after shot-blasting the surfaces to prepare them for coating. The resin coating was applied with a thickness of at least 1.5 millimetres in such manner as to ensure, so far as possible, that a smooth surface finish was obtained and the resin was allowed to cure under ambient temperature conditions.
The resin was an epoxy resin obtained by the condensation of diglycidyl ether with Bisphenol A in the presence of an aromatic amine adduct as curing agent. The characteristics of the epoxy resin are such that, when water is applied to the cured resin surface, the water globules have a high angular content with the resin surface such that substantially no wetting is obtained. A gain of more than 3% in pump efficiency over the standard pump duty point guaranteed by the manufacturer was achieved by the use of this coating of an epoxy resin. The epoxy resin coating can be modified by the inclusion therein of a lubricant, for example, polytetrafluoroethylene or polyethylene wax.
The epoxy resin as such has a brown somewhat translucent appearance and, in order to improve the appearance of the coating, a pigment is incorporated in the epoxy resin.
The pigment can be titanium dioxide. If more than 2% by volume of pigment is incorporated in the epoxy resin, the angular contact of water globules with the resin surface increases such that a degree of wetting is obtained. The amount by volume of titanium dioxide may be 1% by volume but, pigment concentration of just under 0.5% is preferred.
In a further example of the present invention, the pump suction mouth, bowls, guide vanes and pump impellers of a pump set for a water authority were coated with an epoxy resin coating, having the general composition and characteristics described above. It was found that by also coating the pump impellers, an additional improvement in pumping efficiency was obtained.
In a further application of the invention, a pipeline system for transporting water over a substantial distance consists of two or more pumping stations, the pump sets of which have their internal surfaces coated with an epoxy resin coating as defined above and the pipe work interconnecting the pumping stations also has its internal surfaces coated with an epoxy resin. Calculations so far carried out indicate that, although the major benefits of an increase in efficiency are obtained by coating those internal surfaces which correspond to positions of turbulent flow, increases in efficiency are obtained by increasing the areas of the interal surfaces of a system which are appropriately coated.

Claims (8)

1. A method of improving the operating efficiency of a liquid transportation system comprising pump means and interconnected conduit means, wherein at least selected areas of the internal surfaces of the pump means and/or the conduit means are coated with a layer of a resin, the characteristics of which are such that: (a) a smooth surface finish is obtained, and (b) globules of the liquid coming into contact with the resin surface have a high angular contact with the resin surface whereby substantially no wetting is obtained, the application of the coating to the selected areas of the pump means andjor the conduit means being effected for a primary purpose other than that of repairing said selected areas.
2. A method according to claim 1, wherein the resin which is used is an epoxy resin which incorporates a pigment.
3. A method according to claim 2, wherein the volume of the pigment is less than 2% of the volume of the resin.
4. A method according to claim 2 or claim 3, wherein the pigment is titanium dioxide.
5. A method according to claim 2, 3 or 4, wherein the characteristics of the epoxy resin are modified by the inclusion therein of a lubricant.
6. A pump or liquid transportation system at least selected areas of the internal surfaces of which have been coated by the method claimed in any one of claims 1 to 5.
7. A method of improving the operating efficiency of a liquid transportation system substantially as hereinbefore described.
8. A pump or liquid transportation system at least selected areas of the internal surfaces of which have been coated with a resin coating in such manner as to improve the operating efficiency of the liquid transportation system, the resin coating having characteristics substantially as hereinbefore described.
GB08722581A 1986-08-29 1987-09-25 Coating internal surfaces of pumps Withdrawn GB2195920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08722581A GB2195920A (en) 1986-08-29 1987-09-25 Coating internal surfaces of pumps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868623395A GB8623395D0 (en) 1986-08-29 1986-08-29 Coating fluid passageways
GB08722581A GB2195920A (en) 1986-08-29 1987-09-25 Coating internal surfaces of pumps

Publications (2)

Publication Number Publication Date
GB8722581D0 GB8722581D0 (en) 1987-11-04
GB2195920A true GB2195920A (en) 1988-04-20

Family

ID=26291347

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08722581A Withdrawn GB2195920A (en) 1986-08-29 1987-09-25 Coating internal surfaces of pumps

Country Status (1)

Country Link
GB (1) GB2195920A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2349182A (en) * 1999-03-04 2000-10-25 Cummins Engine Co Inc Drag-reducing coating on wall of centrifugal compressor diffuser
EP1134420A3 (en) * 2000-03-15 2002-08-14 FHP Motors GmbH Centrifugal pump with flow improving surface structures
DE102010021240A1 (en) * 2010-05-21 2011-11-24 Oerlikon Leybold Vacuum Gmbh Method for surface treatment of pumping elements or pump chamber inner walls of vacuum pump, involves flushing pump chamber with dispersion medium which is deposited on pump chamber inner walls or surfaces of pump elements

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB852273A (en) * 1958-04-28 1960-10-26 Gen Motors Corp Improvements relating to axial-flow compressors
GB908416A (en) * 1959-10-05 1962-10-17 Ross Gear Improvements in or relating to mechanical assemblies, such as a worm and nut and their manufacture
GB1098876A (en) * 1965-02-24 1968-01-10 Vincent Brammar Improvements in centrifugal pumps, centrifugal separators and other centrifugal machines
GB1102049A (en) * 1966-04-01 1968-02-07 Gen Motors Corp Axial-flow compressors
GB1207072A (en) * 1968-03-05 1970-09-30 Reine Marguerite Fays Centrifugal pump
GB1296964A (en) * 1969-01-22 1972-11-22
GB1373039A (en) * 1971-09-01 1974-11-06 Worthington Corp Centrifugal pump with volute of concrete or the like

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB852273A (en) * 1958-04-28 1960-10-26 Gen Motors Corp Improvements relating to axial-flow compressors
GB908416A (en) * 1959-10-05 1962-10-17 Ross Gear Improvements in or relating to mechanical assemblies, such as a worm and nut and their manufacture
GB1098876A (en) * 1965-02-24 1968-01-10 Vincent Brammar Improvements in centrifugal pumps, centrifugal separators and other centrifugal machines
GB1102049A (en) * 1966-04-01 1968-02-07 Gen Motors Corp Axial-flow compressors
GB1207072A (en) * 1968-03-05 1970-09-30 Reine Marguerite Fays Centrifugal pump
GB1296964A (en) * 1969-01-22 1972-11-22
GB1373039A (en) * 1971-09-01 1974-11-06 Worthington Corp Centrifugal pump with volute of concrete or the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2349182A (en) * 1999-03-04 2000-10-25 Cummins Engine Co Inc Drag-reducing coating on wall of centrifugal compressor diffuser
US6220234B1 (en) 1999-03-04 2001-04-24 Cummins Engine Company Coated compressor diffuser
GB2349182B (en) * 1999-03-04 2003-07-23 Cummins Engine Co Inc Centrifugal compressors
EP1134420A3 (en) * 2000-03-15 2002-08-14 FHP Motors GmbH Centrifugal pump with flow improving surface structures
DE102010021240A1 (en) * 2010-05-21 2011-11-24 Oerlikon Leybold Vacuum Gmbh Method for surface treatment of pumping elements or pump chamber inner walls of vacuum pump, involves flushing pump chamber with dispersion medium which is deposited on pump chamber inner walls or surfaces of pump elements

Also Published As

Publication number Publication date
GB8722581D0 (en) 1987-11-04

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)