StandardTest Method

Evaluation of Internal Plastic Coatings forCorrosion Control of Tubular Goods in an Aqueous Flowing Environment

This NACE International standard represents a consensus of those individual members who havereviewed this document, its scope, and provisions. Its acceptance does not in any respectpreclude anyone, whether he has adopted the standard or not, from manufacturing, marketing,purchasing, or using products, processes, or procedures not in conformance with this standard.Nothing contained in this NACE International standard is to be construed as granting any right, byimplication or otherwise, to manufacture, sell, or use in connection with any method, apparatus, orproduct covered by Letters Patent, or as indemnifying or protecting anyone against liability forinfringement of Letters Patent. This standard represents minimum requirements and should in noway be interpreted as a restriction on the use of better procedures or materials. Neither is thisstandard intended to apply in all cases relating to the subject. Unpredictable circumstances maynegate the usefulness of this standard in specific instances. NACE International assumes noresponsibility for the interpretation or use of this standard by other parties and acceptsresponsibility for only those official NACE International interpretations issued by NACE Internationalin accordance with its governing procedures and policies which preclude the issuance ofinterpretations by individual volunteers

Users of this NACE International standard are responsible for reviewing appropriate health, safety,environmental, and regulatory documents and for determining their applicability in relation to thisstandard prior to its use. This NACE International standard may not necessarily address allpotential health and safety problems or environmental hazards associated with the use ofmaterials, equipment, and/or operations detailed or referred to within this standard. Users of thisNACE International standard are also responsible for establishing appropriate health, safety, andenvironmental protection practices, in consultation with appropriate regulatory authorities ifnecessary, to achieve compliance with any existing applicable regulatory requirements prior to theuse of this standard.

CAUTIONARY NOTICE: NACE International standards are subject to periodic review, and may berevised or withdrawn at any time without prior notice. NACE International requires that action betaken to reaffirm, revise, or withdraw this standard no later than five years from the date of initialpublication. The user is cautioned to obtain the latest edition. Purchasers of NACE Internationalstandards may receive current information on all standards and other NACE Internationalpublications by contacting the NACE International Membership Services Department, P.O. Box218340, Houston, Texas 77218-8340 (telephone +1 281/228-6200).

Reaffirmed 2000-03-28Approved 1983

Reaffirmed March 1988Reaffirmed September 1993

NACE InternationalP.O. Box 218340

Houston, Texas 77218-8340+1 281/228-6200

ISBN 1-57590-100-5© 2000, NACE International

NACE Standard TM0183-2000Item No. 21213

TM0183-2000

NACE International i

Foreword

This test method was written to provide manufacturers, applicators, and users of internal pipecoatings with a method of comparing the performance of these coatings. This method is notintended to correlate with any field performance but merely provides a means of comparingsamples of internally coated tubing or line pipe under identical flowing water conditions.

This standard was originally prepared in 1983 by Work Group T-1G-6b of Unit Committee T-1G on Protective Coatings and Nonmetallic Materials for Oilfield Use. It was reviewed by T-1G-6and reaffirmed by Unit Committee T-1G in 1988, 1993, and 2000 and is issued by NACEInternational under the auspices of Group Committee T-1 on Corrosion Control in PetroleumProduction.

In NACE standards, the terms shall, must, should, and may are used in accordance with thedefinitions of these terms in the NACE Publications Style Manual, 3rd ed., Paragraph 8.4.1.8. Shalland must are used to state mandatory requirements. Should is used to state that which is consideredgood and is recommended but is not absolutely mandatory. May is used to state that which isconsidered optional.

TM0183-2000

ii NACE International

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NACE InternationalStandard

Test Method

Evaluation of Internal Plastic Coatingsfor Corrosion Control of Tubular Goods

in an Aqueous Flowing Environment

Contents

1. General .................................................................................................................... 12. Apparatus ................................................................................................................ 13. Test Sample Preparation .......................................................................................... 14. Test Procedure ........................................................................................................ 25. Reproducibility of Coating Performance .................................................................... 46. Recording Test Data ................................................................................................ 4References..................................................................................................................... 4Figure 1-Schematic Diagram of a Typical Test Apparatus ............................................... 3

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TM0183-2000

Section 1: General

1.1 The test method set forth in this standard can be usedto evaluate and compare the corrosion protection thatvarious internal plastic coatings afford oilfield tubular goods.

Using this test method, random sections are tested withflowing water at a given velocity under controlledtemperatures for a specified period of time.

Section 2: Test Apparatus

2.1 The test apparatus required for this test includes avolume tank, a pumping system, and a piping systemcontaining a heater and temperature controller. A typicalarrangement is shown in Figure 1; however, otherarrangements may be suitable, provided they meet thefollowing requirements:

2.1.1 The test apparatus must be placed in a verticalposition to prevent the formation of air pockets.

2.1.2 A plastic rod must be placed inside the testspecimen holder (Figure 1). It has two functions:

(a) To reduce the inside cross-sectional area of thepipe in order to obtain desired flow velocity more easilywith a smaller pump.(b) To stiffen the assembly and to hold the testspecimen in place.

2.1.3 To ensure that test parameters are maintainedduring extended test intervals, the flow rate and tem-perature shall be monitored as follows:

(a) If multiple test specimens are run in parallelinstead of in series, each loop must be valved to allowregulation of flow rate. The flow rate must bemonitored for each loop by a suitable flow meter ordischarge method.(b) The temperature of the test medium shall bemonitored at two or more points as indicated in Figure1.

2.1.4 Design of the mechanical system shall providefor normal maintenance permitting continuous long-term operation.

NACE International 1

Section 3: Test Specimen Preparation

3.1 Test specimens shall be sections of 50-mm (2-in.)nominal ID tubing or line pipe taken randomly from a typicalproduction run of coated pipe.

3.1.1 Test specimens shall be 30 to 60 cm (12 to 24in.) in length.

3.1.2 The test specimen shall be taken from the pinend, the box end (including the coupling), and thecenter section of randomly selected tubing or pipe.

3.2 Test specimens shall be identified in a manner that willnot damage the coating.

3.3 Test specimens shall be holiday tested. Locations ofany holidays shall be marked and recorded. For thepurposes of this test method, holidays on thin- and thick-filmcoatings shall be defined and detected as follows:

3.3.1 For thin-film coatings, a holiday is defined as anelectrical discontinuity of less than 80,000 ohmsresistance sensed with a wet sponge. Holidayinspection voltage is usually 67.5 V direct current forthin-film coatings. The particular test equipment usedis left to the discretion of the operator. When the signal

device of the test equipment is activated, a holiday isindicated. Where there is no activation of the signaldevice as the probe travels through the length of thetest specimen, the test specimen is designated“holiday-free.” See NACE Standard TM0384.1

3.3.2 For thick-film coatings, holiday testing may beconducted by passing a suitable contact probe throughthe test specimen. The probe should be connected bymeans of an appropriately insulated lance to aninstrumented high-voltage source that is also groundedto the test specimen. A minimum acceptable voltage isthat which is required to arc across an air gapcorresponding to the maximum coating thickness. Arough rule of thumb for dry air gap testing is 100 V per25 µm (1 mil) coating thickness. The particular testequipment used is left to the discretion of the operator.The holiday signal response indicated for thin-filmcoatings (above) applies for thick-film coatings as well.See NACE Standard TM0186.2

3.4 Test specimens shall be visually inspected. Thepresence of any runs, sags, or blisters shall be recordedprior to testing.

TM0183-00

3.5 Film thickness of each test specimen shall bemeasured at four places, 90° apart, on each end of the testspecimen to determine that the coating meets specifiedthickness. The measurements shall be taken 25 mm (1.0in.) from each end of the test specimen.

3.6 Several test specimens may be tested simultaneouslyin the same test, provided all the parameters can bemaintained.

3.7 A control test specimen with previously determinedperformance shall be included in the test.

2 NACE International

Section 4: Test Procedure

4.1 Test specimens shall be carefully installed in the pipingsystem to prevent damage to the coating. A rubber orplastic gasket of the same ID as the pipe shall be installedbetween test specimens to prevent galvanic effects. The pinand box may be made up to specified torque and tested asan assembly.

4.2 The flow rate of the test medium and the diameter ofthe stiffener rod (Paragraph 2.1.2) shall be adjusted toproduce a velocity of 760 to 910 mm (2.5 to 3.0 ft) persecond across the coating surface. The flow rate and cross-sectional flow area are related to velocity according toEquation (1):

second) per (mm Velocity = )

2(mm area sectionalCross

second) per 3

(mm rate Flow

�

(1)

4.3 The test medium shall consist of synthetic ocean waterin accordance with ASTM(1) D 11413 Procedure.

4.4 The test medium shall be:

4.4.1 Maintained at a constant temperature of 66 ±3°C(150 ±5°F).

4.4.2 Aerated to saturation by suitable mechanicalmethods.

4.4.3 Replaced with fresh test medium approximatelyevery seven days.

4.5 The test period shall continue for a total of 5,000 hours.The test specimens shall be visually examined after the first500 hours and 1,000 hours of exposure and thereafter at1,000-hour intervals. If visual examination indicates afailure, the test specimen shall be removed and analyzed inaccordance with Paragraph 4.6. If no failure is indicated,the test specimen shall be returned to the system andmaintained in the test for another 1,000 hours. A coatingthat no longer meets the end user’s performancespecifications constitutes a failure.

4.6 When the test is completed, the test specimen shall beexamined within 1 hour of removal from test for softening,swelling, and holidays. The test specimen shall then bestored at ambient conditions for 24 hours before beingsectioned lengthwise with a metal saw for examination. Thetest specimen shall be compared with an untestedspecimen to detect the following:

(a) Blistering(b) Softening(c) Coating thickness changes (swelling)(d) Adhesion(e) Bleaching(f) Metal attack(g) Underfilm creep

4.6.1 Rating Key—For bleaching, swelling, andsoftening:

(a) No change(b) Slight change(c) Severe change

4.6.2 Rating Key—For adhesion:

(a) No change(b) Slight loss of adhesion(c) Severe loss of adhesion

4.6.2.1 The recommended method fordetermining adhesion is to cut the coating to themetal substrate using a two-sided hobby knifeblade. The point of the blade shall be drawnacross the film (using multiple cuts if necessary) tocut a single V-shaped groove. Using the sharpside of the blade as a wedge, the coating filmshould be pried up within the groove. The exposedmetal substrate should be observed under a 10 to15X microscope to determine adhesionperformance. An average of the three attemptsshall be used to rate adhesion.

____________________________(1) American Society for Testing and Materials (ASTM), 100 Barr Harbor Dr., West Conshohocken, PA 19428-2959.

TM0183-2000

NACE International 3

4.6.3 Rating Key—For metal attack:

(a) No apparent corrosion(b) Corrosion occurred

4.6.4 Rating Key—For blistering: Use ASTM D 714.4

4.6.5 Rating Key�For underfilm creep: Reportmillimeters of underfilm creep.

Figure1 — Schematic diagram of a typical test apparatus.

PVC Cap

PVC Pipe

PVC NippleHose andClampsPVC Tee

Packing Nut

PVC Tee

Annular Flow- Space PVC Nipple Hose and Clamps Plastic Coat. Pipe

Plastic RodThreaded Both Ends

Control TestSpecimen

PlasticRod

Hose Temperature Measuring Point

Open Tank

Typical End Assy.

TestSpecimen

Water Pump

Tank

Temperature Measuring Point

Valves

Typical EndAssy.

TM0183-00

Section 5: Reproducibility of Coating Performance

5.1 Performance of any test specimen of a given coatingshould be consistent each time that coating is tested.

Section 6: Recording Test Data

6.1 The following test data shall be recorded:

6.1.1 The coating description, coating thickness,generic classification of the coating, applicator, andsize and grade of tubular goods.

6.1.2 Any special notes pertaining to the application ofthe coating.

6.1.3 The initial, periodic, and final visual results of thecoating.

6.1.4 The initial and final holiday test results.

6.1.5 The initial and final results regarding adhesion tothe metal substrate.

6.1.6 The amount of underfilm creep.

6.1.7 The final results regarding the conditions of themetal substrate.

ISBN 1-575900-100-54 NACE International

References

1. NACE Standard TM0384 (latest revision), “HolidayDetection of Internal Tubular Coatings of Less Than 250 µm(10 mils) Dry Film Thickness” (Houston, TX: NACEInternational).

2. NACE Standard TM0186 (latest revision), “HolidayDetection of Internal Tubular Coatings of 250 to 760 µm (10to 30 mils) Dry Film Thickness” (Houston, TX: NACE).

3. ASTM Standard D 1141 (latest revision), “StandardPractice for the Preparation of Substitute Ocean Water”(West Conshohocken, PA: ASTM).

4. ASTM Standard D 714 (latest revision), “Standard TestMethod for Evaluating Degree of Blistering of Paints” (WestConshocken, PA: ASTM).