API SC5/WG Item 1033a
(or New Line Number)
7A1 Friction & Galling Test
STATUS: January 2010
Project Goals WG 1033a
Budget Year 2001 DeliverablesGoal
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The Goal of the project is to complete
development & testing bench-top test for
galling & friction for the API C1/SC5 test
program.
GrantPrideco & Stress will generate data
base comparing the new specimen
assembly to full scale connections.
New recommendations for API will be
documented & reported.
WG 1033a Project Goals
Budget Year 2002 Status of

Deliverables
The Goal of the project
to complete development & testing
bench-top test for galling & friction for the API C1/SC5 test
program. STATUS: The equipment shows good correlation
but many problems are encountered with the Honeywell
load cells and with bolts breaking.

GrantPrideco & Stress will generate data base comparing the
new specimen assembly to full scale connections. STATUS:
Data was generated with full scale connections but
problems were encountered with tong slippage and the
placement of the strain gauges on the full size
connections.

New recommendations for API will be documented & reported.
STATUS: Due to the issues with bolt and load cell
reliability no formal recommendations were able to be
drafted. The group will work to isolate the causes and
make recommendations to resolve.
GOAL OF DRAFTING A
PROCEDURE
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The goal of drafting a procedure was
not met due to failures in several of
the assembly components. The work
group felt drafting a procedure in
which flaws were known was not to
the benefit of the API Community.
Although correlations are superior to
the current 7A1 specimen set, the
procedure was not ready to draft.
WG 1033a Project Goals
Budget Year 2002 Deliverables
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The Goal of the project is to establish standardized
performance tests for evaluating the suitability of
Environmentally acceptable thread compounds.
Full Scale product performance experiments designed
for comprehensive evaluation of any thread compound
would be made.
Identification of small scale test methods for friction
and galling will be more fully evaluated and compared
to available full scale data.

Project Goals WG 1033a
Budget Year 2002 Status of
Deliverables
Goal of the project is to establish standardized performance tests for
The
evaluating the suitability of Environmentally acceptable thread compounds.
STATUS: The equipment continues to show good
correlation but problems are still being encountered with
the Honeywell load cells and with bolts breaking.
Omegadyne load cells were purchased.

Full Scale product performance experiments designed for comprehensive
evaluation of any thread compound would be made. STATUS: Full
data reports were distributed to JIP participants and the
API and can be available for other interested parties .

Identification of Small scale test methods for friction and galling will be more
fully evaluated and compared to available full scale data.
STATUS: Evaluations of the bench scale test equipment
continue with the goal of the group to isolate the causes
and make recommendations to resolve.
Current Project Goals WG 1033a
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The Goal of the project is to provide a
RELIABLE bench-top test which correlates
to full scale drill string connections.
Evaluate whether the apparatus or
procedure can be modified to provide a
correlation to API noninterference and
proprietary mechanical seal tubing & casing
thread designs
Utilize the bench top test apparatus to
measure relative galling resistance of
thread compounds.
WG 1033a
- CURRENT STATUS –
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The current goal is to fabricate the new Jet-Lube/Stress
Engineering Services specimen set design which utilizes a 1 ¼
inch bolt to eliminate issues with the 1 inch.
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Move the API Committee torque turn equipment from Stress
Engineering Services to Texas A&M University.
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Generate a formal proposal from Texas A&M University to do
the project work in 2010. The formal proposal would include
itemized list of raw materials to purchase or fabricate, what
compounds or types to test, list the required tests and time for
preparing the reports.

Compare the data to full scale connection data run on the
same products as shown on next slide deliverables.
Deliverables with API Funding
Deliverables:
Friction & Galling resistance test assembly or assemblies;
- For Rotary shouldered connections, more substantial assembly
for measuring contact pressures up to 150K
- For noninterference connection designs such as 8-round or
buttress the current assembly in test for contact pressures up to
55K using spring disk washers and load cell for greater sensitivity
in this contact pressure limit.
- For proprietary mechanical seal connection designs a new
assembly to test for contact pressures up to 150K using spring disk
washers and load cell.
- For galling resistance testing the current assembly has shown to
correlate to full scale connections and coating wear.
To test the on the above a wide range of coefficients of friction on
several thread compounds used in the past which showed the API
RP 1 inch bolt did not work. These include a 15% PTFE nonmetallic
compound, 60% lead reference compound, API RP 5A3 reference
compound, a commercial nonmetallic (Yellow) compound for
proprietary mechanical seal connection designs, 50% zinc and a
high performance commercial Copper compound with 1.15 friction
factor.
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ACTION
ITEMS
Complete design & fabrication of a test assembly
which provides a correlation to field data on full scale
thread designs. Current API RP 7A1 has very little
correlation.
Test the suitability and reliability of the compressive
load cell designed by Mr. Jack Smith of Stress
Engineering Services for repeated loads of up to
150KSI. Alloys used: One of 4140, the other with 174PH
Replace the 60 percent lead reference compound
which plates onto the specimens and has an effect on
the subsequent compound test data.
See current API RP 7A1
Example of Obsolete API Bulletin
7A1 Test Apparatus
TORQUE CALIBRATION SUBS
API RP 7A1 SPECIMEN SET
DESIGNS
1992 RP 7a1 vs. Full Scale NC-46
Late 1990’s Small Rotary
Shouldered Tool Joint Torque Turn
Specimens
CURRENT FRICTION & GALLING
TEST SPECIMEN SET DESIGNS
PROPOSED SPECIMEN SET
DESIGN
PROPOSED ASSEMBLY
DESIGN
1st Attempt at 150K Load Cell
Next 150K Load Cell
ISSUES WITH CURRENT API
RP 7A1 METHOD
PROPERTY
API RP 7A1 - 1 inch Bolt
Specimen
RESULTS
Limited relative surface travel.
No correlation with nonmetal
compounds
Current 60% Lead Reference
Compound
Plates interfering with subsequent
results, Toxicity
Current RP 7A1 Protocol
Cannot measure contact pressure
Comparison by slope at a set
torque limit
Current Apparatus and method
Correct method should be to
determine torque to achieve a
desired load
Absolutely no correlation with
Tubing and casing thread designs
ISSUES WHICH STILL NEED
TO BE RESOLVED
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Determine the composition & properties
for a bolt lube with consistent COF
Determine whether the proposed
enhanced specimen design eliminates
current load cell, bolt & nut failures
Determine whether the new specimen
design & bolt lube can test up to 150 KSI
Compare the results to full scale
connection data
Coefficient of friction graphs for same product
where only particle size varies.
Experimental Batches 4343 (medium), 4344
(Std/Micro) & 4345 (larger size)
AVERAGE COEFFICIENT OF FRICTION FOR XP 4343, 4344 AND 4345
0.14
Coefficient of Friction
0.12
0.1
0.08
AVERAGE OF RUNS - XP 4345
RUN AVERAGE - SG XP 4344
0.06
AVERAGE OF RUNS - XP 4343
0.04
0.02
0
0
100
200
300
400
Degree of Rotation, Make-up
500
600
Torque Turn Graph for Typical
Galling Test
Proposed Galling Specimen Showing
Only Wear
Proposed Galling Specimen Showing Galling
Schedule
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Review of expected schedule milestones
with additional funding
Machine new load cell and get
it strain gauged & calibrated
Fabricate new assembly & purchase
Specimen sets &
Run Broad range testing
Complete data review
& draft test procedure
August
Oct
Dec
Feb
Apr
June
The timeline is based upon the expectation the proposed test assembly
will not have long lead times to machine or purchase, will correlate well
and allow many tests without components yielding.