WO1997021997B1 - Method and apparatus for monitoring nylon 11 parts - Google Patents

Method and apparatus for monitoring nylon 11 parts

Info

Publication number
WO1997021997B1
WO1997021997B1 PCT/US1996/019451 US9619451W WO9721997B1 WO 1997021997 B1 WO1997021997 B1 WO 1997021997B1 US 9619451 W US9619451 W US 9619451W WO 9721997 B1 WO9721997 B1 WO 9721997B1
Authority
WO
WIPO (PCT)
Prior art keywords
polyamide
molecular weight
measuring
part made
nylon
Prior art date
Application number
PCT/US1996/019451
Other languages
French (fr)
Other versions
WO1997021997A1 (en
Filing date
Publication date
Priority claimed from US08/571,610 external-priority patent/US5614683A/en
Application filed filed Critical
Priority to DK96944250T priority Critical patent/DK0888538T3/en
Priority to AT96944250T priority patent/ATE249623T1/en
Priority to EP96944250A priority patent/EP0888538B1/en
Priority to DE69629945T priority patent/DE69629945T2/en
Priority to AU14107/97A priority patent/AU1410797A/en
Publication of WO1997021997A1 publication Critical patent/WO1997021997A1/en
Publication of WO1997021997B1 publication Critical patent/WO1997021997B1/en
Priority to NO19982575A priority patent/NO320559B1/en

Links

Abstract

The molecular weight of nylon 11 has been found to be a reliable indicator of the mechanical properties and remaining useful life of parts made therefrom. By periodically monitoring the molecular weight of nylon 11, and comparing the measured molecular weight to a standard curve or table, the expected useful life remaining, rate of deterioration, time of part replacement, and mechanical properties of a part can be determined. The molecular weight of the nylon 11 in the part may advantageously be determined using witness coupons placed in close proximity to the nylon 11 part such that they are exposed to the same processing and environmental conditions as the part. These witness coupons can advantageously be retrieved at the required time period using a spooled piece of pipe or the like. Alternatively, the molecular weight of the nylon 11 in the part may advantageously be determined from core samples taken from the part being monitored, during use in the field, on a periodic basis. In addition, the molecular weight of the nylon 11 in the part might also be inferred from a nylon 11 sample held in a laboratory which is exposed to substantially the same environmental conditions as the nylon 11 part. The molecular weight measurements can be made using standard techniques and equipment such as a viscometer, gel permeation equipment, or light scattering equipments.

Claims

AMENDED CLAIMS[received by the International Bureau on 9 June 1997 (09.06.97); original claims 1-19 replaced by new claims 1 - 17 (4 pages)]
1. A method for evaluating percent of life remaining, used up. and rate of aging a part made of polyamide formed from aminoundecanoic acid comprising the steps of: determining a start time for use of said part made of said polyamide; measuring a molecular weight of said polyamide. said measuring step being performed at a measurement time; identifying a use time for said part made of said polyamide by subtracting said start time from said measurement time; comparing said molecular weight measured during said measuring step to a standard curve or table which correlates molecular weight to time; and assessing life information for said part made of said polyamide as a function of said use time, said molecular weight, and said standard curve or table, said life information being selected from the group consisting of life remaining for said part, life used up for said part, and rate at which life of said part is being used up.
2. The method of claim 1 wherein said step of measuring is performed with a viscometer, and wherein said molecular weight measured during said step of measuring is a viscosity average molecular weight.
3. The method of claim 1 wherein said step of measuring further comprises the step of obtaining a sample from said part made of said polyamide, said measuring step being performed on said sample.
4. The method of claim 1 wherein said step of measuring comprises the step of retrieving a witness coupon made of said polyamide from a position where said witness coupon is exposed to an environment identical to said part made of said polyamide. said measuring step being performed on said witness coupon.
5. The method of claim 1 wherein said step of measuring comprises the step of aging a sample of said polyamide in an environment which duplicates of simulates a field environments for said part made of said polyamide. said measuring step being performed on said sample of said polyamide.
6. The method of claim 1 wherein said comparing step includes the step of using a graph as said standard curve or table.
7. The method of claim 1 wherein said comparing step includes the step of using a table as said standard curve or table.
8. The method of claim 1 wherein said step of assessing life information provides a value for life remaining for said part made of said polyamide.
9. The method of claim 1 wherein said step of assessing life information provide a value of life used up for said part made of said polyamide.
10. The method of claim 1 wherein said step of assessing life information provides a value for a rate at which life of said part made of said polyamide is being used up.
11. The method of claim 1 wherein said measuring step, said identifying step, said comparing step, and said assessing life information step are each performed repeatedly at prescribed intervals.
12. A method of identifying a time to replace parts made of polyamide formed form aminoundecanoic acid in a service environment, comprising the steps of: measuring a molecular weight of said polyamide for said part made of said polyamide; determining if said molecular weight from said measuring step is greater than a threshold value: and indicating said part made of said polyamide is in need of replacement if said molecular weight is below said threshold value.
13. The method of claim 12 wherein said step of measuring includes the step of providing a viscosity averaged molecular weight value as said molecular weight, and wherein said determining step includes the step of using 17,000 as said threshold value.
14. The method of claim 12 wherein said step of measuring comprises the step of obtaining a sample from said part made of said polyamide. said measuring step being performed on said sample.
15. The method claim 12 wherein said step of measuring comprises the step of retrieving a witness coupon made of said polyamide from a position where said witness coupon is exposed to an environment identical to said part made of said polyamide, said measuring step being performed on said witness coupon.
16. The method of claim 12 wherein said step of measuring comprises the step of aging a sample of said polyamide in an environment which simulates a field environment for said part made of said polyamide, said measuring step being performed on said sample of said polyamide.
17. A method of evaluating a part made of a polyamide formed from aminoundecanoic acid, comprising the steps of: measuring a molecular weight of said polyamide used in said part; using said molecular weight to assess life information selected from the group consisting of life remaining for said part, life used up from said part, modulus, and elongation and load at yield and break.
PCT/US1996/019451 1995-12-13 1996-12-09 Method and apparatus for monitoring nylon 11 parts WO1997021997A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DK96944250T DK0888538T3 (en) 1995-12-13 1996-12-09 Procedure for monitoring nylon 11 parts
AT96944250T ATE249623T1 (en) 1995-12-13 1996-12-09 METHOD FOR MONITORING NYLON 11 PARTS
EP96944250A EP0888538B1 (en) 1995-12-13 1996-12-09 Method for monitoring Nylon 11 parts
DE69629945T DE69629945T2 (en) 1995-12-13 1996-12-09 Procedure for monitoring nylon 11 parts
AU14107/97A AU1410797A (en) 1995-12-13 1996-12-09 Method and apparatus for monitoring nylon 11 parts
NO19982575A NO320559B1 (en) 1995-12-13 1998-06-05 Procedure for Evaluating Percentage Remaining Life, Exhausted Lifespan and Aging Rate of a Part Made of Polyamide.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/571,610 1995-12-13
US08/571,610 US5614683A (en) 1995-12-13 1995-12-13 Method and apparatus for monitoring nylon 11 made from polyamide plastic made from aminoundecanoic acid

Publications (2)

Publication Number Publication Date
WO1997021997A1 WO1997021997A1 (en) 1997-06-19
WO1997021997B1 true WO1997021997B1 (en) 1997-07-17

Family

ID=24284390

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/019451 WO1997021997A1 (en) 1995-12-13 1996-12-09 Method and apparatus for monitoring nylon 11 parts

Country Status (8)

Country Link
US (1) US5614683A (en)
EP (1) EP0888538B1 (en)
AT (1) ATE249623T1 (en)
AU (1) AU1410797A (en)
DE (1) DE69629945T2 (en)
DK (1) DK0888538T3 (en)
NO (1) NO320559B1 (en)
WO (1) WO1997021997A1 (en)

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EP1342754B1 (en) * 2002-03-04 2008-03-26 Arkema France Polyamide composition for use in oil or gas transporting flexible hoses
US7069772B2 (en) * 2004-05-07 2006-07-04 Kranbuehl David E Method to predict the end-point, replacement time and to monitor changes in that time by using pre aged witness coupons
ATE542668T1 (en) † 2004-06-22 2012-02-15 Arkema France MULTI-LAYER POLYAMIDE-BASED STRUCTURE FOR COVERING SUBSTRATES
FR2892796B1 (en) * 2005-10-27 2007-12-21 Inst Francais Du Petrole USE OF THE POLYAMIDE 11 FOR THE INTERNAL COATING OF A GAS LINE WITH A VIEW TO REDUCING LOAD LOSSES
US7487666B2 (en) * 2006-04-17 2009-02-10 Kranbuehl David E Method to predict the end-point, replacement time and to monitor changes in that time using pre aged witness coupons
WO2013169241A1 (en) * 2012-05-09 2013-11-14 Bp Corporation North America Inc. Predictive corrosion coupons from data mining
WO2014197550A1 (en) * 2013-06-05 2014-12-11 David Kranbuehl Multi point method and apparatus for monitoring the aging and changes in corresponding tensile performance properties of a polymer
JP6964399B2 (en) * 2015-09-02 2021-11-10 旭有機材株式会社 Piping member deterioration diagnosis method and equipment
US10605754B2 (en) 2017-12-01 2020-03-31 David E. Kranbuehl Ductile-brittle transition of poly(amide) as determined by a heat of fusion-crystallinity number

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US3970723A (en) * 1974-07-31 1976-07-20 General Electric Company Impregnating and encapsulating composition for use with type transformers and transformers containing such composition
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