CA2492154A1 - Lightweight pipe drift - Google Patents
Lightweight pipe drift Download PDFInfo
- Publication number
- CA2492154A1 CA2492154A1 CA 2492154 CA2492154A CA2492154A1 CA 2492154 A1 CA2492154 A1 CA 2492154A1 CA 2492154 CA2492154 CA 2492154 CA 2492154 A CA2492154 A CA 2492154A CA 2492154 A1 CA2492154 A1 CA 2492154A1
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- fiberglass
- diameter
- tool
- drifts
- 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.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/46—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable
- G01B3/50—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable of limit-gauge type, i.e. "go/no-go"
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Laminated Bodies (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
Pipe "drifts" are traditionally dimensioned plugs that are inserted through pipe during inspection to ensure minimum required internal dimensions are present in the pipe being examined. This invention is fabricated using fiberglass materials to overcome weight and dimensional instability issues inherent with traditionally used materials.
Description
Ducloaare:
This invention relates to manual or machine driven three-dimensions! plugs that are used to ensure minimum required internal dimensions are present in hollow sections being examined.
It is common to require that longitudinal hollow sections such as pipe and square tubing meet minimum internal dimensional requirements. This is typically achievod by inserting a device of knows outside dimensions inside the unit being checked. Passage of the inserted mechanism thmugh the subject piece confirms minimum internal dimensions are present.
In the case of pips in particular, three test devices or "drifts" have traditionally been made of steel. Given sufficient material to olrtain adequate rigidity and dimensional stability, these plugs have bin used for decades as simple "go / no-go" gauges to accept or reject hollow sections such as pipe. Pipe manufactured of corrosion resistant alloys are prone to contamination by contact with carbon steel test units / drills.
Other materials such as wood, solid plastics, and plastic coatings over steel bodies have been widely used to minimize such contamination. Difficulties arising from use of these traditional alternate materials include dimensional instability due to relatively high coefficients of thermal expansion and impregnation with water and oil. Further, drifts are typically handled manually by inspection personnel, often single-haadedly in remote or field locations. Larger drifts in particular subject inspection personnel to high exposure to soft tissue injury from pinch points, muscle and beak strains due to excessive weight.
The inventor has found that alI of the above concerns can be either eliminated or as a minimum highly mitigated, by use of fiberglass (or glass reinforced plastic, GRP}
composition. GItP and sister compounds as typically used in; the boat-building and automotive industry have proven to be sufficiently strong and wear resistant to perform the required function. Additionally, these materials are dimensionally stable, typically having a coefficient of thermal expansion very close to that of steel. They are impervious to liquids, and inlxrently safe to use on corrosion resistant alloys.
Depending upon diameter and length, weight can be reduced to as little as 25°r6 of a typical steel unit, for example 164 Ib. steel unit replaced by 34 Ib. GItP unit.
Use of the invention is generally in accordance with that of traditional drifts. The only potential drawback identified in the fiberglass versus steel comparison is that fiberglass may start to deform at temperatures above 150 degrees Fahrenheit. Inspections are normally conducted in ambient temperatures, which are not hostile to workers.
No lower temper~u~e limit has been identified. GRP has a better temperatiu~e range than other plastics commonly used, for example Teflon.
Attached drawings which describe the invention are:
Drawi_na #1 General Descri~on /~vout.
This drawing shows typical drift constnxtion and can be made of traditional materials such as steel.
~rawina #2., Axial Section This drawing shows longitudinal secrion of GItP drift construction. To produce this unit, a mandrel with outside diameter equal to required internal diameter of the finished drift is fabricated. This mandrel is then installs upon a rotating spindle. The main cylinder body is then applied over tlbe mandrel by weans of built up GRP layers. This can be achieved either by hand lay-up of multiple layers of woven fiberglass clout, as is typical of boat construction, or filament winding process as used to manufacture fibaglsas pipe.
Sufficient wall thiclmt~ss to achieve the required rigidity is determined as a function of diameter and length, also considering the number of bulkheads placed. This body cylinder is typically produced 3 to 4 incls~d longer than tire finished article. Depending upon means employed by the machinist to hold the body in tt~ lathe, this excess is typically used to center and turn the unit with excess length cut off and hand finished attar final machining.
Bulkheads are flat fiberglass discs that are hand laid, cut to required diameter and Meanslof attachment ins supplih end, typi~~ly nominal'/=" "U" or "eye" bolts affixed to the middle of the end lmlkheads.
Tlrwurino #3~ Trwnaverse 111. SCCtiOn A-A
This section is taken approximately one inch from (either) extmrae end of the unit, facing the exposed end bulkhead and means of attachment. Wall detail shows, from the inside out;
a) Hand finished layer which extends inward to entirely cover and retain the bulkhead.
b) Main cylinder / body which is applied over rotating mandrsl and cured under heat lamps. This rough cylinder is then machined typically 0.020" smaller than the required fmisla'd diameter. Hand applied while rotating, several layers of a suitable "gel" coat or epoxy coating are applied and cured by heat lamps. When the new rough outside diameter is determined to be greater than the required finished diameter, final machining is performed. Final diameter, including machining tolerances, is determined by end user or standard requirements.
Typical applicable standard requir~emerns are detailed in American Petroleum Institute (API) specification Sf:T.
c) Finish coat, as noted above, is machined to achieve a suitable diameter with accepmble wear properties. Depending upon abrasivecxss of the material being inspected / drifted, coatings can be applied as required. As with conventional stal drifts, once wear approaches allowable lirrtits (typically 0.005" off initial outside diameter) remaining finish coatings can be raachined off and re-applied.
Z
Drawi~g,~ ' 1 Detail Section of End Area. Sectiqp ~; B.
This drawing shows defisil of how end areas are terminated. After finish machining of the effective length of the cylinder, the body is tapered. This end bumper helps protect the effective length from mechanical damage due to rough handling. It also effectively reduces the outside diameter sad facilitates ease of entry of the drift into the pipe being tested. Hand applied fiberglass techniques are used to finish the end area up to the beginning of the effective machined length of the outside diameter, care being taken not to exceed the cylinder outside diameter.
This invention relates to manual or machine driven three-dimensions! plugs that are used to ensure minimum required internal dimensions are present in hollow sections being examined.
It is common to require that longitudinal hollow sections such as pipe and square tubing meet minimum internal dimensional requirements. This is typically achievod by inserting a device of knows outside dimensions inside the unit being checked. Passage of the inserted mechanism thmugh the subject piece confirms minimum internal dimensions are present.
In the case of pips in particular, three test devices or "drifts" have traditionally been made of steel. Given sufficient material to olrtain adequate rigidity and dimensional stability, these plugs have bin used for decades as simple "go / no-go" gauges to accept or reject hollow sections such as pipe. Pipe manufactured of corrosion resistant alloys are prone to contamination by contact with carbon steel test units / drills.
Other materials such as wood, solid plastics, and plastic coatings over steel bodies have been widely used to minimize such contamination. Difficulties arising from use of these traditional alternate materials include dimensional instability due to relatively high coefficients of thermal expansion and impregnation with water and oil. Further, drifts are typically handled manually by inspection personnel, often single-haadedly in remote or field locations. Larger drifts in particular subject inspection personnel to high exposure to soft tissue injury from pinch points, muscle and beak strains due to excessive weight.
The inventor has found that alI of the above concerns can be either eliminated or as a minimum highly mitigated, by use of fiberglass (or glass reinforced plastic, GRP}
composition. GItP and sister compounds as typically used in; the boat-building and automotive industry have proven to be sufficiently strong and wear resistant to perform the required function. Additionally, these materials are dimensionally stable, typically having a coefficient of thermal expansion very close to that of steel. They are impervious to liquids, and inlxrently safe to use on corrosion resistant alloys.
Depending upon diameter and length, weight can be reduced to as little as 25°r6 of a typical steel unit, for example 164 Ib. steel unit replaced by 34 Ib. GItP unit.
Use of the invention is generally in accordance with that of traditional drifts. The only potential drawback identified in the fiberglass versus steel comparison is that fiberglass may start to deform at temperatures above 150 degrees Fahrenheit. Inspections are normally conducted in ambient temperatures, which are not hostile to workers.
No lower temper~u~e limit has been identified. GRP has a better temperatiu~e range than other plastics commonly used, for example Teflon.
Attached drawings which describe the invention are:
Drawi_na #1 General Descri~on /~vout.
This drawing shows typical drift constnxtion and can be made of traditional materials such as steel.
~rawina #2., Axial Section This drawing shows longitudinal secrion of GItP drift construction. To produce this unit, a mandrel with outside diameter equal to required internal diameter of the finished drift is fabricated. This mandrel is then installs upon a rotating spindle. The main cylinder body is then applied over tlbe mandrel by weans of built up GRP layers. This can be achieved either by hand lay-up of multiple layers of woven fiberglass clout, as is typical of boat construction, or filament winding process as used to manufacture fibaglsas pipe.
Sufficient wall thiclmt~ss to achieve the required rigidity is determined as a function of diameter and length, also considering the number of bulkheads placed. This body cylinder is typically produced 3 to 4 incls~d longer than tire finished article. Depending upon means employed by the machinist to hold the body in tt~ lathe, this excess is typically used to center and turn the unit with excess length cut off and hand finished attar final machining.
Bulkheads are flat fiberglass discs that are hand laid, cut to required diameter and Meanslof attachment ins supplih end, typi~~ly nominal'/=" "U" or "eye" bolts affixed to the middle of the end lmlkheads.
Tlrwurino #3~ Trwnaverse 111. SCCtiOn A-A
This section is taken approximately one inch from (either) extmrae end of the unit, facing the exposed end bulkhead and means of attachment. Wall detail shows, from the inside out;
a) Hand finished layer which extends inward to entirely cover and retain the bulkhead.
b) Main cylinder / body which is applied over rotating mandrsl and cured under heat lamps. This rough cylinder is then machined typically 0.020" smaller than the required fmisla'd diameter. Hand applied while rotating, several layers of a suitable "gel" coat or epoxy coating are applied and cured by heat lamps. When the new rough outside diameter is determined to be greater than the required finished diameter, final machining is performed. Final diameter, including machining tolerances, is determined by end user or standard requirements.
Typical applicable standard requir~emerns are detailed in American Petroleum Institute (API) specification Sf:T.
c) Finish coat, as noted above, is machined to achieve a suitable diameter with accepmble wear properties. Depending upon abrasivecxss of the material being inspected / drifted, coatings can be applied as required. As with conventional stal drifts, once wear approaches allowable lirrtits (typically 0.005" off initial outside diameter) remaining finish coatings can be raachined off and re-applied.
Z
Drawi~g,~ ' 1 Detail Section of End Area. Sectiqp ~; B.
This drawing shows defisil of how end areas are terminated. After finish machining of the effective length of the cylinder, the body is tapered. This end bumper helps protect the effective length from mechanical damage due to rough handling. It also effectively reduces the outside diameter sad facilitates ease of entry of the drift into the pipe being tested. Hand applied fiberglass techniques are used to finish the end area up to the beginning of the effective machined length of the outside diameter, care being taken not to exceed the cylinder outside diameter.
Claims (3)
1. A manual or machine driven tool constructed of fiberglass materials that, once passed freely through a pipe or other hollow section, confirms that required minimum inside dimensions of the piece being tested are present.
2. A tool as described is claim 1, on which a gel or epoxy coating has been applied to provide an accurately machined and abrasive resistant finish.
3. A tool as described in claim 1 or claim 2 that has been fitted with fiberglass bulkheads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2492154 CA2492154A1 (en) | 2005-01-08 | 2005-01-08 | Lightweight pipe drift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2492154 CA2492154A1 (en) | 2005-01-08 | 2005-01-08 | Lightweight pipe drift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2492154A1 true CA2492154A1 (en) | 2006-07-08 |
Family
ID=36646260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2492154 Abandoned CA2492154A1 (en) | 2005-01-08 | 2005-01-08 | Lightweight pipe drift |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2492154A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008060391B3 (en) * | 2008-12-03 | 2010-04-15 | V&M Deutschland Gmbh | Method for checking the driftability of metallic pipes |
-
2005
- 2005-01-08 CA CA 2492154 patent/CA2492154A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008060391B3 (en) * | 2008-12-03 | 2010-04-15 | V&M Deutschland Gmbh | Method for checking the driftability of metallic pipes |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |