Leak Testing - O-ring installation in the groove of Bore ID

GURU SDI

Involved In Discussions
#1
Hello All,

I have received a customer complaint in a brake assembly in which leak is observed. After doing analysis on field samples, it is found that the leak is due to improper O-ring installation. Actually an O-ring is installed in a groove in the bore ID & piston is assembled in the Bore ID. This is done by manually.

Any improper placement of O-ring in the groove making the leak in the process. Now we would like to ensure the proper O-ring installation in the bore. Kindly suggest any process improvements to automate the O-ring installation in the groove of Bore ID. Kindly suggest

Thank you
 
Elsmar Forum Sponsor

Steve Prevette

Deming Disciple
Staff member
Super Moderator
#2
Re: Leak testing - O ring

Would really need to know what is the failure. Is the o-ring rolled or twisted? Not in the groove properly? Are you sure there is no defect with the groove or the o-ring itself? Is the o-ring lubricated? Why do you believe automation would solve the problem? Is this an immediate failure when put on service?
 

GURU SDI

Involved In Discussions
#3
Hello Steve,

The complaint is Oil leak from the assembly.

The O-ring got twisted, it got deformed when we opened the assembly for analysis.

The groove corner radius, entry chamfer are measured and found okay.

The O-rings are not lubrictaed.

The O-ring material is FFKM.

Since the manual process is possible for making a improper assembly in the groove.
 

Steve Prevette

Deming Disciple
Staff member
Super Moderator
#4
Of course there is always a possibility of creating an automated robot of some sort. Other options include:

1. Is the worker able to lay the O-ring into place with the grooves horizontal?
2. Does the work have to push the O-ring into the cylinder a ways before getting to the groove (you mention this being a Bore Inner Diameter?). That could cause unequal twisting.
3. Is there a way to visually tell that the O-ring has gotten twisted during installation? Could the surface be marked or chalked to make it visible that the O-ring is twisted?
4. Is it possible that the O-ring is being installed properly, but is getting twisted during assembly?
5. Would adding a second person as an inspector help? That may depend upon answer to question 3.
6. Has this problem always existed or did it start recently? Related - is this a new design? Any changes in manufacturing or manufacturer? Any experience with a similar assembly that had no problems?
 
Z

zancky

#5
in my past experience with FKM oring we have found very useful dry self-lubricating o-ring (i.e. fkm oring with a thin shell, few micrometers, of a mix of ptfe and fkm)
they work as standard FKM for temperature glass transition and performances and as lubricated orings for the operator assembly.
one big advantage was we were able to make a reliable tightness test as there was no oil
 
Thread starter Similar threads Forum Replies Date
N MSA Study for a Leak Testing Device Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
M Proper ISO standard for Pressure Testing and Leak Rates Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
H Validating Nondestructive leak testing machine Qualification and Validation (including 21 CFR Part 11) 3
S Zyglo Fluorescent Dye for Leak Testing - Sloooooow acting - Seeking advice Reliability Analysis - Predictions, Testing and Standards 4
S Capability or Gage R&R Study for Leak Tester? Reliability Analysis - Predictions, Testing and Standards 15
F Leak Tester Gage R&R Sheet Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 0
triathlonx13 Leak test correlation - Bubble to Air Reliability Analysis - Predictions, Testing and Standards 8
O Capability or Gage R&R Study for Leak Tester Reliability Analysis - Predictions, Testing and Standards 11
L Environmental Gas Leak Detection Equipment Recomendations Miscellaneous Environmental Standards and EMS Related Discussions 2
T Would a Leak be a Failure Mode on a Design FMEA? Design and Development of Products and Processes 2
GURU SDI Measurement - Pressure Drop vs. Leak Rate Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
S Destructive Attribute MSA for Simple Water Leak Check in Trailers Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
somashekar Why does a tap leak... Funny Stuff - Jokes and Humour 2
B Validation of a Pressure Decay Leak Tester for a Medical Device Design and Development of Products and Processes 2
Claes Gefvenberg Massive gas leak off Scotland World News 12
H Determining Calibration Tolerance for new Leak and Occlusion Equipment Measurement Uncertainty (MU) 2
N Tyvek Pouch Seal - Pressure needed to conduct Vacuum Seal Leak test? 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
V For an MDI, is leak-test a stability parameter ? 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
R Sample Size for P Chart - 100% Leak Test for Condensor Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
R Seal Packaging - Burst and Leak Specifications for a Foil Seal applied to a PTFE well Manufacturing and Related Processes 4
T Gage Repeatability for an Automated Leak Tester Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 10
W Oven Leak Test Method - Integrity of the chamber to hold gas Qualification and Validation (including 21 CFR Part 11) 3
D Leak Test Method for Balloon Catheters EU Medical Device Regulations 2
B MSA (Gage R&R) vs. Capability Cpk Study - Helium Leak Check Station Statistical Analysis Tools, Techniques and SPC 2
D Halogen Leak Detector - Calibration source needed General Measurement Device and Calibration Topics 1
G Leak Tester Calibration - Sentinal C-20 controller with a calibrated orifice General Measurement Device and Calibration Topics 1
G Leak Test - Building a master pump to calibrate pump tester Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
ScottK Oxygen Cleaning and Surfactants used for leak detection Various Other Specifications, Standards, and related Requirements 1
T Calibration of vacuum type leak detectors manufactured by Vacuum Technology Inc General Measurement Device and Calibration Topics 5
H GR&R (Gage R&R) on leak test equipment is there a deviation requirment? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
R Calibrating Leak Testers - Old fashioned water tank type tester General Measurement Device and Calibration Topics 2
C Master Validation Frequency in production - Absence of leak, thread presence, etc. Reliability Analysis - Predictions, Testing and Standards 4
W Leak Detection - Oven Seals General Measurement Device and Calibration Topics 1
M Developing a Leak Test - Housing part for an automotive customer Various Other Specifications, Standards, and related Requirements 7
A Class I (exempt) testing requirements Other Medical Device Related Standards 0
JoCam Electrical Testing for Japan, PSE or CB Scheme Other Medical Device Regulations World-Wide 0
M Who are the go to companies for non-destructive hardness testing? General Measurement Device and Calibration Topics 3
M Determining if an Insulin Pen Testing Machine is a Medical Device? EU Medical Device Regulations 4
P Testing cloud-based backups IT (Information Technology) Service Management 6
I IATF Lab Scope Testing Qualification and Competency Documentation IATF 16949 - Automotive Quality Systems Standard 3
N Chemical Testing on Medical Devices - Solutions in a container closure system (bag) EU Medical Device Regulations 1
M Comparing data from destructive testing Inspection, Prints (Drawings), Testing, Sampling and Related Topics 7
T Flammability testing Reliability Analysis - Predictions, Testing and Standards 0
E Manufacturers should develop a testing device for covid19 Service Industry Specific Topics 0
K When is Bioburden Testing Required? Other Medical Device Related Standards 4
K IEC 62304 - Testing Independance IEC 62304 - Medical Device Software Life Cycle Processes 5
A ANSI/AAMI versions of 60601-1-2 and related testing requirements Other Medical Device Related Standards 0
C Surgical mask stability testing (CE mark) EU Medical Device Regulations 2
Beliz Biocompatibility Testing for Laser Epilation Device EU Medical Device Regulations 2
C One Time Service Supplier - Temperature and Humidity Testing Service ISO 13485:2016 - Medical Device Quality Management Systems 5

Similar threads

Top Bottom