In the past few years, there have been several inquiries regarding the HBLT’s ability to perform tests that comply with different ISO standards. Crescent Design’s … Read More
The post HBLT can be used for ISO 594-1 and 2 compliant testing appeared first on Crescent Design.
Follow these Top 10 tips to ensure optimal performance of your HBLT.
The post HBLT Care & Feeding – Top 10 Tips appeared first on Crescent Design.
When attaching a part under test to the Hydraulic Burst/Leak Tester (HBLT), the ideal method is a direct connection to the HBLT outlet port. However, … Read More
The post Which is best to Connect Parts for Pressure Testing? appeared first on Crescent Design.
This video demonstrates the Crescent Design Hydraulic Burst Leak Tester and Crescent Design’s Pressure Manager© software being used to burst-test a raw angioplasty balloon.
We … Read More
The post Burst Testing an Angioplasty Balloon with the Hydraulic Burst Leak Tester appeared first on Crescent Design.
In the past few years, there have been several inquiries regarding the HBLT’s ability to perform tests that comply with different ISO standards. Crescent Design’s … Read More
The post HBLT can be used for ISO 594-1 and 2 compliant testing appeared first on Crescent Design.
Follow these Top 10 tips to ensure optimal performance of your HBLT.
The post HBLT Care & Feeding – Top 10 Tips appeared first on Crescent Design.
When attaching a part under test to the Hydraulic Burst/Leak Tester (HBLT), the ideal method is a direct connection to the HBLT outlet port. However, … Read More
The post Which is best to Connect Parts for Pressure Testing? appeared first on Crescent Design.
This video demonstrates the Crescent Design Hydraulic Burst Leak Tester and Crescent Design’s Pressure Manager© software being used to burst-test a raw angioplasty balloon.
We … Read More
The post Burst Testing an Angioplasty Balloon with the Hydraulic Burst Leak Tester appeared first on Crescent Design.
Overview:
This document will cover basic issues that may arise with the HBLT and provide a guide on how to troubleshoot and resolve them. HBLT … Read More
The post HBLT Troubleshooting Guide appeared first on Crescent Design.
In the past few years, there have been several inquiries regarding the HBLT’s ability to perform tests that comply with different ISO standards. Crescent Design’s HBLT can perform tests that are ISO 594 compliant. The HBLT can be programmed to perform the test method described in ISO 594-1 and 2, section 5.2 (test method for liquid leakage from fitting assembly under pressure). The HBLT can detect a “leakage sufficient to form a falling drop” as required by ISO 594.
The video shows the HBLT being used in conjunction with Pressure Manager Software so that the ISO 594 compliant test can be visualized.
The post HBLT can be used for ISO 594-1 and 2 compliant testing appeared first on Crescent Design.
Follow these Top 10 tips to ensure optimal performance of your HBLT.
The post HBLT Care & Feeding – Top 10 Tips appeared first on Crescent Design.
When attaching a part under test to the Hydraulic Burst/Leak Tester (HBLT), the ideal method is a direct connection to the HBLT outlet port. However, when parts are in a safety enclosure or water bath, you must extend the hydraulic path from the HBLT outlet to the part. This usually means adding an extension tube to your fixture.
The main goal is to select tubing that does not affect the test results. The tubing must have sufficient inner diameter to allow some flow without a pressure drop. The tubing should have no or minimal compliance. In addition, any tubing must be easily purged if it is left in place for extended periods. Finally, keep the tubing length as short as possible. Overall tubing compliance worsens with length.
When using the HBLT with a Smart Manifold in parallel mode, take special precautions to insure the sum of the compliance of all ten extension tubes does not affect your test. Use the least compliant tubing and keep the lengths as short as possible.
The ideal tubing is stainless steel tubing with compression fittings. If the flow demands are low, then smaller diameter tubing is easily bent into shapes and attached at both ends with compression fittings. Crescent Design sells an Outlet Plumbing Kit which provides the HBLT user with a quick and easy means for attaching product to the HBLT for testing. For higher flow rates, larger diameter tubing formed with multiple pieces or bent with tubing bending tools works well.
Plastic tubing that is sufficiently non-compliant also works as well. We have found that Qosina part number 33018 is a good substitute to stainless steel for some applications. It is made of two coextruded plastics that have little compliance but are flexible. This tubing works well with water baths where the parts are attached and then moved into the water bath for testing. The flexibility of the plastic is superior to the fixed shape stainless steel tubing in this application.
Avoid using braided steel high-pressure tubing. This tubing is extremely compliant until the inner rubber or plastic tube contacts the steel braid. This can affect the ramp rates because of the overall changing compliance characteristics.
If you need to evaluate your tubing selection, request the document Tubing Extension Sets Compliance Study from Crescent Design. This document details testing methods to insure a good tubing selection.
The post Which is best to Connect Parts for Pressure Testing? appeared first on Crescent Design.
This video demonstrates the Crescent Design Hydraulic Burst Leak Tester and Crescent Design’s Pressure Manager© software being used to burst-test a raw angioplasty balloon.
We see the balloon being filled prior to the actual start of the linear ramp test. When the actual test begins you see that it acquires the ramp rate quickly and maintains 20 psi per second until the balloon bursts.
You can also see that the volume (the lower blue trace) is reported as the balloon expands and stretches. The delivery rate remains fairly constant until the pressure reaches about 50 psi when the balloon begins to expand faster and the volume delivery rate increases. The Hydraulic Burst Leak Tester’s sophisticated control software is automatically increasing the volume delivery to maintain the desired pressure ramp rate.
The Pressure Manager© summary screen displays the pressure and volume values in real time until balloon bursts where it captures the actual burst event pressure of 336.5 psi and the event volume of 1.09cc. The Result Messages shows the test elapsed time of 16.9 seconds.
The post Burst Testing an Angioplasty Balloon with the Hydraulic Burst Leak Tester appeared first on Crescent Design.
Overview:
This document will cover basic issues that may arise with the HBLT and provide a guide on how to troubleshoot and resolve them. HBLT Troubleshooting Guide PDF
| Problem | Possible Problem | Possible Solution |
|---|---|---|
|
BURPING The HBLT is experiencing excessive burping (clicking) when trying to run a test. |
The 0 pressure point of the HBLT has drifted. If the HBLT is burping (clicking) excessively it is most likely sitting over +/-2PSI when open to atmosphere. Note: Some burping is common and expected especially if you have a high purge rate set on the HBLT. On average 2 to 4 clicks is fine. |
Since the HBLT has drifted off its zero point you will need to calibrate the HBLT. Please review the Owners Manual and see our website at www.Crescentdesign.com and go to the “How To” videos section for a demo video on calibrating the HBLT. |
|
PRESSURE OVERSHOOT HBLT overshooting the programmed pressure target. |
This can be caused by one or more of these issues:
|
Make sure to purge the HBLT under vacuum every morning or before the start of each shift. Run a total of 3 purge cycles under vacuum. Note: Always make sure that your parts are prepped and purged of air for best test results. Lower the compliance setting Lower the Ramp Rate |
|
MOTOR STALLED ERROR When purging the HBLT under vacuum and the “Motor Stalled” error message is displayed. |
If the HBLT purges into an open container with nothing attached to the outlet, but the motor stalls when purging under vacuum the HBLT needs to be calibrated. If this error is displayed while running a test please contact Crescent Design. |
Calibrate the HBLT. Please review the Owners Manual and go to www.Crescentdesign.com and navigate to “How To” videos section for a demo video on calibrating the HBLT. |
|
MOTOR OVERHEATING ERROR When running a test and the “Motor Overheating” error is displayed. |
It is possible to get the actuator motor hot during tests that maintain high pressures for long periods of time or during fatigue tests with a large number of cycles. The motor needs to be turned off to cool down. It is possible to get the actuator motor hot during tests that maintain high pressures for long periods of time or during fatigue tests with a large number of cycles. The motor needs to be turned off to cool down. |
Turn off the HBLT. Use a rag or towel to put over the luer connection at the outlet and disconnect it to relieve the pressure. Let the HBLT sit while turned off for 30 minutes to let the motor cool. |
|
PRESSURE LIMIT EXCEEDED ERROR When running a test and the “Pressure Limit Exceeded” message is displayed. |
The hydraulic pressure exceeded the operational limits of the HBLT. The main cause of this problem is mis-calibration. Target pressure is close to the HBLT limit. |
Calibrate the HBLT and run the test again. If the issue persists please contact Crescent Design. Lower the ramp rate. |
|
THE CYLINDER IS OUT OF WATER CHECK FOR LEAKS When running a test the “Cylinder is out of water check for leaks” is displayed. |
This message is displayed when the actuator reaches the exhaust limit switch while running a test. This can occur if the product leaks, is very compliant, or is compliant and large. The cylinder does not have enough volume to reach the target pressure and maintain it. Internal HBLT leakage. |
If not using a FILL: Check the product for leaks. Pre-fill the product before running the test. Try constraining the product to limit its compliance. Lean HBLT on side and see if any water comes out of enclosure. |
|
A FILL (or PURGE) TIMEOUT HAS OCCURED. PLEASE CALL FOR SERVICE. During the fill sequence the “Fill Timeout” message is displayed. |
The HBLT displays this alert message when the fill operation times out without encountering a limit switch. The timeout value varies depending on the cylinder volume. Wrong power module inlet power selection. |
Install power module voltage selector for 110-120V |
|
FALSE BURST REPORTED When running a test and the HBLT declares a burst but the product is intact with no failure or leak. |
Tubing loose in Tuohy-Borst which allows the tubing to slip in the fitting causing a sudden drop in pressure. CAUTION: Over tightening the Touhy-Borst fitting can collapse the tubing restricting fluid flow and pressurization of the product under test. An internal HBLT leak. |
Change the compression fitting rubber O-ring often. A damaged O-ring will cause connection issues. Use a quality connector such as the Plasti-Mate Tuohy-Borst made by S4J manufacturing PN# A7530. Mark the balloon stem with a black sharpie right at the connection so you can see if it slips. It may be necessary to use a hypo tube inside the I.D. of the product tube to allow sufficient compression of the fitting without collapsing the fluid path. This will also ensure repeatable product-to-product test results. To check the HBLT for leaks, install a metal cap or ball valve directly to the outlet and run a simple ramp test to the maximum pressure of the HBLT and let it dwell for 60 seconds. If it leaks down more than 10% in 60 seconds please contact Crescent Design. |
|
FALSE BURST AT START OF DOWN RAMP |
The up burst or down burst setting is too close to the down ramp rate setting. |
Increase the down burst rate or decrease the down ramp rate. Ensure that the compliance settings are correct (not too high). |
|
FALSE BURST AT THE BEGINNING OF A TEST |
The initial (starting) pressure is negative (below zero) causing the HBLT to detect a downward pressure decay. |
Check HBLT calibration and adjust if necessary. Ensure that zero is adjusted close to zero. |
|
INTAKE LIMIT ERROR |
If this error is displayed when running a test it may be caused by the HBLT zero calibration point not being at zero (or close to zero). If zero is off more than 3 PSI the intake limit switch could be reached before reaching zero PSI. |
Calibrate the HBLT. Review the Owners Manual and go to www.Crescentdesign.com and navigate to “How To” videos section for a demo video on calibrating the HBLT. |
|
EXHAUST LIMIT ERROR |
If this error is displayed it could be one of the following issues: An HBLT or product leak prevents reaching the target pressure. This allows the HBLT to activate the exhaust limit switch. The product is too compliant or large for the HBLT to reach the set pressure. |
To check the HBLT for leaks, install a metal cap or ball valve directly to the outlet and run a simple ramp test to the maximum pressure of the HBLT and let it dwell for 60 seconds. If it leaks down more than 10% in 60 seconds please contact Crescent Design. Inspect the product for pinhole leaks. Check maximum volume output of your model HBLT and verify how much volume is needed to test each different product. |
The post HBLT Troubleshooting Guide appeared first on Crescent Design.
In the past few years, there have been several inquiries regarding the HBLT’s ability to perform tests that comply with different ISO standards. Crescent Design’s HBLT can perform tests that are ISO 594 compliant. The HBLT can be programmed to perform the test method described in ISO 594-1 and 2, section 5.2 (test method for liquid leakage from fitting assembly under pressure). The HBLT can detect a “leakage sufficient to form a falling drop” as required by ISO 594.
The video shows the HBLT being used in conjunction with Pressure Manager Software so that the ISO 594 compliant test can be visualized.
The post HBLT can be used for ISO 594-1 and 2 compliant testing appeared first on Crescent Design.
Follow these Top 10 tips to ensure optimal performance of your HBLT.
The post HBLT Care & Feeding – Top 10 Tips appeared first on Crescent Design.
When attaching a part under test to the Hydraulic Burst/Leak Tester (HBLT), the ideal method is a direct connection to the HBLT outlet port. However, when parts are in a safety enclosure or water bath, you must extend the hydraulic path from the HBLT outlet to the part. This usually means adding an extension tube to your fixture.
The main goal is to select tubing that does not affect the test results. The tubing must have sufficient inner diameter to allow some flow without a pressure drop. The tubing should have no or minimal compliance. In addition, any tubing must be easily purged if it is left in place for extended periods. Finally, keep the tubing length as short as possible. Overall tubing compliance worsens with length.
When using the HBLT with a Smart Manifold in parallel mode, take special precautions to insure the sum of the compliance of all ten extension tubes does not affect your test. Use the least compliant tubing and keep the lengths as short as possible.
The ideal tubing is stainless steel tubing with compression fittings. If the flow demands are low, then smaller diameter tubing is easily bent into shapes and attached at both ends with compression fittings. Crescent Design sells an Outlet Plumbing Kit which provides the HBLT user with a quick and easy means for attaching product to the HBLT for testing. For higher flow rates, larger diameter tubing formed with multiple pieces or bent with tubing bending tools works well.
Plastic tubing that is sufficiently non-compliant also works as well. We have found that Qosina part number 33018 is a good substitute to stainless steel for some applications. It is made of two coextruded plastics that have little compliance but are flexible. This tubing works well with water baths where the parts are attached and then moved into the water bath for testing. The flexibility of the plastic is superior to the fixed shape stainless steel tubing in this application.
Avoid using braided steel high-pressure tubing. This tubing is extremely compliant until the inner rubber or plastic tube contacts the steel braid. This can affect the ramp rates because of the overall changing compliance characteristics.
If you need to evaluate your tubing selection, request the document Tubing Extension Sets Compliance Study from Crescent Design. This document details testing methods to insure a good tubing selection.
The post Which is best to Connect Parts for Pressure Testing? appeared first on Crescent Design.
This video demonstrates the Crescent Design Hydraulic Burst Leak Tester and Crescent Design’s Pressure Manager© software being used to burst-test a raw angioplasty balloon.
We see the balloon being filled prior to the actual start of the linear ramp test. When the actual test begins you see that it acquires the ramp rate quickly and maintains 20 psi per second until the balloon bursts.
You can also see that the volume (the lower blue trace) is reported as the balloon expands and stretches. The delivery rate remains fairly constant until the pressure reaches about 50 psi when the balloon begins to expand faster and the volume delivery rate increases. The Hydraulic Burst Leak Tester’s sophisticated control software is automatically increasing the volume delivery to maintain the desired pressure ramp rate.
The Pressure Manager© summary screen displays the pressure and volume values in real time until balloon bursts where it captures the actual burst event pressure of 336.5 psi and the event volume of 1.09cc. The Result Messages shows the test elapsed time of 16.9 seconds.
The post Burst Testing an Angioplasty Balloon with the Hydraulic Burst Leak Tester appeared first on Crescent Design.
Overview:
This document will cover basic issues that may arise with the HBLT and provide a guide on how to troubleshoot and resolve them. HBLT Troubleshooting Guide PDF
| Problem | Possible Problem | Possible Solution |
|---|---|---|
|
BURPING The HBLT is experiencing excessive burping (clicking) when trying to run a test. |
The 0 pressure point of the HBLT has drifted. If the HBLT is burping (clicking) excessively it is most likely sitting over +/-2PSI when open to atmosphere. Note: Some burping is common and expected especially if you have a high purge rate set on the HBLT. On average 2 to 4 clicks is fine. |
Since the HBLT has drifted off its zero point you will need to calibrate the HBLT. Please review the Owners Manual and see our website at www.Crescentdesign.com and go to the “How To” videos section for a demo video on calibrating the HBLT. |
|
PRESSURE OVERSHOOT HBLT overshooting the programmed pressure target. |
This can be caused by one or more of these issues:
|
Make sure to purge the HBLT under vacuum every morning or before the start of each shift. Run a total of 3 purge cycles under vacuum. Note: Always make sure that your parts are prepped and purged of air for best test results. Lower the compliance setting Lower the Ramp Rate |
|
MOTOR STALLED ERROR When purging the HBLT under vacuum and the “Motor Stalled” error message is displayed. |
If the HBLT purges into an open container with nothing attached to the outlet, but the motor stalls when purging under vacuum the HBLT needs to be calibrated. If this error is displayed while running a test please contact Crescent Design. |
Calibrate the HBLT. Please review the Owners Manual and go to www.Crescentdesign.com and navigate to “How To” videos section for a demo video on calibrating the HBLT. |
|
MOTOR OVERHEATING ERROR When running a test and the “Motor Overheating” error is displayed. |
It is possible to get the actuator motor hot during tests that maintain high pressures for long periods of time or during fatigue tests with a large number of cycles. The motor needs to be turned off to cool down. It is possible to get the actuator motor hot during tests that maintain high pressures for long periods of time or during fatigue tests with a large number of cycles. The motor needs to be turned off to cool down. |
Turn off the HBLT. Use a rag or towel to put over the luer connection at the outlet and disconnect it to relieve the pressure. Let the HBLT sit while turned off for 30 minutes to let the motor cool. |
|
PRESSURE LIMIT EXCEEDED ERROR When running a test and the “Pressure Limit Exceeded” message is displayed. |
The hydraulic pressure exceeded the operational limits of the HBLT. The main cause of this problem is mis-calibration. Target pressure is close to the HBLT limit. |
Calibrate the HBLT and run the test again. If the issue persists please contact Crescent Design. Lower the ramp rate. |
|
THE CYLINDER IS OUT OF WATER CHECK FOR LEAKS When running a test the “Cylinder is out of water check for leaks” is displayed. |
This message is displayed when the actuator reaches the exhaust limit switch while running a test. This can occur if the product leaks, is very compliant, or is compliant and large. The cylinder does not have enough volume to reach the target pressure and maintain it. Internal HBLT leakage. |
If not using a FILL: Check the product for leaks. Pre-fill the product before running the test. Try constraining the product to limit its compliance. Lean HBLT on side and see if any water comes out of enclosure. |
|
A FILL (or PURGE) TIMEOUT HAS OCCURED. PLEASE CALL FOR SERVICE. During the fill sequence the “Fill Timeout” message is displayed. |
The HBLT displays this alert message when the fill operation times out without encountering a limit switch. The timeout value varies depending on the cylinder volume. Wrong power module inlet power selection. |
Install power module voltage selector for 110-120V |
|
FALSE BURST REPORTED When running a test and the HBLT declares a burst but the product is intact with no failure or leak. |
Tubing loose in Tuohy-Borst which allows the tubing to slip in the fitting causing a sudden drop in pressure. CAUTION: Over tightening the Touhy-Borst fitting can collapse the tubing restricting fluid flow and pressurization of the product under test. An internal HBLT leak. |
Change the compression fitting rubber O-ring often. A damaged O-ring will cause connection issues. Use a quality connector such as the Plasti-Mate Tuohy-Borst made by S4J manufacturing PN# A7530. Mark the balloon stem with a black sharpie right at the connection so you can see if it slips. It may be necessary to use a hypo tube inside the I.D. of the product tube to allow sufficient compression of the fitting without collapsing the fluid path. This will also ensure repeatable product-to-product test results. To check the HBLT for leaks, install a metal cap or ball valve directly to the outlet and run a simple ramp test to the maximum pressure of the HBLT and let it dwell for 60 seconds. If it leaks down more than 10% in 60 seconds please contact Crescent Design. |
|
FALSE BURST AT START OF DOWN RAMP |
The up burst or down burst setting is too close to the down ramp rate setting. |
Increase the down burst rate or decrease the down ramp rate. Ensure that the compliance settings are correct (not too high). |
|
FALSE BURST AT THE BEGINNING OF A TEST |
The initial (starting) pressure is negative (below zero) causing the HBLT to detect a downward pressure decay. |
Check HBLT calibration and adjust if necessary. Ensure that zero is adjusted close to zero. |
|
INTAKE LIMIT ERROR |
If this error is displayed when running a test it may be caused by the HBLT zero calibration point not being at zero (or close to zero). If zero is off more than 3 PSI the intake limit switch could be reached before reaching zero PSI. |
Calibrate the HBLT. Review the Owners Manual and go to www.Crescentdesign.com and navigate to “How To” videos section for a demo video on calibrating the HBLT. |
|
EXHAUST LIMIT ERROR |
If this error is displayed it could be one of the following issues: An HBLT or product leak prevents reaching the target pressure. This allows the HBLT to activate the exhaust limit switch. The product is too compliant or large for the HBLT to reach the set pressure. |
To check the HBLT for leaks, install a metal cap or ball valve directly to the outlet and run a simple ramp test to the maximum pressure of the HBLT and let it dwell for 60 seconds. If it leaks down more than 10% in 60 seconds please contact Crescent Design. Inspect the product for pinhole leaks. Check maximum volume output of your model HBLT and verify how much volume is needed to test each different product. |
The post HBLT Troubleshooting Guide appeared first on Crescent Design.
Pressure Manager© is software that coordinates the HBLT (Hydraulic Burst Leak Tester) pressure profiles and micrometer readings. The common method is to command the HBLT to perform a staircase test using either a test or a sequence of commands called a script. At each step in the test, Pressure Manager© requests a micrometer reading after maintaining the pressure. If using a script, Pressure Manager© records pressures and diameter each for each execution of the READ MICROMETER command. During the test or script, Pressure Manager© keeps a table consisting of the desired pressure, the actual pressure and the micrometer reading. Optionally, Pressure Manager© saves the table data in a comma-delimited file for documentation or further analysis.
Pressure Manager© uses two types of micrometers. The first is the Mitutoyo contact micrometer using the PC serial interface. The second is the Keyence optical micrometer using the PC serial interface to the Keyence 7601 micrometer controller. There are several micrometer heads available for measuring different ranges.
Learn more about the Pressure Manager© Software and learn more about the HBLT.
The post How does Pressure Manager© work with micrometers? appeared first on Crescent Design.