where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

Airstar Inc.
Application of the newest technologies, such as air-coupled ultrasound, digital instrumentation, signal processing, and transducer technology.
4037 views
Technical Discussions
jarno de jonge
jarno de jonge
06:12 Apr-01-2008
comparing UT acceptance ASME VIII, B31.1 and B31.3

Dear Colleagues,

After comparing the acceptance criteria from these 3 codes it seems like the acceptance for B31.3 is much less stringent then for the other two codes.

Is this correct and does anbody know why this is? Or am I just overlooking something in B31.3?

The acceptance for ASME VIII and B31.1 seem to be exactly the same. They don't allow linear discontinuities over 20% DAC and reject rounded discontinuities when they exceed a certain length and 100%DAC.

As far as I can find; B31.3 does not reject rounded discontinuties. And linear discontinuties are allowed to have some length and are allowed to produce indications up to 100% DAC (similar as is allowed for the rounded indications in VIII and B31.1).

Looking forward to an explanation.

Kind Regards,

Jarno de Jonge



 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
06:05 Apr-02-2008
Re: comparing UT acceptance ASME VIII, B31.1 and B31.3

Acceptance criteria does not necessarily be the same when comparison is being made against different code requirements.
ASME Viii is a pressure vessel code, B31.1 - Power Piping and B31.3 - Process Piping.
It is true that B31.3 is less stringent but then again take note it is a piping system designed for and above 0 but less than 105Kpa (15psi)

----------- Start Original Message -----------
: Dear Colleagues,
: After comparing the acceptance criteria from these 3 codes it seems like the acceptance for B31.3 is much less stringent then for the other two codes.
: Is this correct and does anbody know why this is? Or am I just overlooking something in B31.3?
: The acceptance for ASME VIII and B31.1 seem to be exactly the same. They don't allow linear discontinuities over 20% DAC and reject rounded discontinuities when they exceed a certain length and 100%DAC.
: As far as I can find; B31.3 does not reject rounded discontinuties. And linear discontinuties are allowed to have some length and are allowed to produce indications up to 100% DAC (similar as is allowed for the rounded indications in VIII and B31.1).
: Looking forward to an explanation.
: Kind Regards,
: Jarno de Jonge
------------ End Original Message ------------




 
 Reply 
 
Ryan Burns
Ryan Burns
00:44 Apr-03-2008
Re: comparing UT acceptance ASME VIII, B31.1 and B31.3
Quote "It is true that B31.3 is less stringent but then again take note it is a piping system designed for and above 0 but less than 105Kpa (15psi)"

Mr. Sudharmin, this is not correct. 31.3 most certanly allows for pressures above 15psi.

Regards,

RB

----------- Start Original Message -----------
:
: Acceptance criteria does not necessarily be the same when comparison is being made against different code requirements.
: ASME Viii is a pressure vessel code, B31.1 - Power Piping and B31.3 - Process Piping.
: It is true that B31.3 is less stringent but then again take note it is a piping system designed for and above 0 but less than 105Kpa (15psi)
: : Dear Colleagues,
: : After comparing the acceptance criteria from these 3 codes it seems like the acceptance for B31.3 is much less stringent then for the other two codes.
: : Is this correct and does anbody know why this is? Or am I just overlooking something in B31.3?
: : The acceptance for ASME VIII and B31.1 seem to be exactly the same. They don't allow linear discontinuities over 20% DAC and reject rounded discontinuities when they exceed a certain length and 100%DAC.
: : As far as I can find; B31.3 does not reject rounded discontinuties. And linear discontinuties are allowed to have some length and are allowed to produce indications up to 100% DAC (similar as is allowed for the rounded indications in VIII and B31.1).
: : Looking forward to an explanation.
: : Kind Regards,
: : Jarno de Jonge
------------ End Original Message ------------




 
 Reply 
 
jarno de jonge
jarno de jonge
08:43 Apr-03-2008
Re: comparing UT acceptance ASME VIII, B31.1 and B31.3
There seems to be only an exclusion in B31.3 for this pressure range under certain circumstances. This means that we are just as well talking about pressurised piping.

For this reason I found it remarkable that the acceptance is less stringent for B31.3 piping than for other pressure containing parts (vessels and B31.1 piping)

Jarno

----------- Start Original Message -----------
: Quote "It is true that B31.3 is less stringent but then again take note it is a piping system designed for and above 0 but less than 105Kpa (15psi)"
: Mr. Sudharmin, this is not correct. 31.3 most certanly allows for pressures above 15psi.
: Regards,
: RB
: :
: : Acceptance criteria does not necessarily be the same when comparison is being made against different code requirements.
: : ASME Viii is a pressure vessel code, B31.1 - Power Piping and B31.3 - Process Piping.
: : It is true that B31.3 is less stringent but then again take note it is a piping system designed for and above 0 but less than105Kpa (15psi)
: : : Dear Colleagues,
: : : After comparing the acceptance criteria from these 3 codes it seems like the acceptance for B31.3 is much less stringent then for the other two codes.
: : : Is this correct and does anbody know why this is? Or am I just overlooking something in B31.3?
: : : The acceptance for ASME VIII and B31.1 seem to be exactly the same. They don't allow linear discontinuities over 20% DAC and reject rounded discontinuities when they exceed a certain length and 100%DAC.
: : : As far as I can find; B31.3 does not reject rounded discontinuties. And linear discontinuties are allowed to have some length and are allowed to produce indications up to 100% DAC (similar as is allowed for the rounded indications in VIII and B31.1).
: : : Looking forward to an explanation.
: : : Kind Regards,
: : : Jarno de Jonge
------------ End Original Message ------------




 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
05:33 Apr-03-2008
Re: comparing UT acceptance ASME VIII, B31.1 and B31.3
My sincere apologies for the inadvertent mistake. I must have overlooked the fact that the statement was meant to be an exclusion of the code's scope. Thank you for the comment.

----------- Start Original Message -----------
: Quote "It is true that B31.3 is less stringent but then again take note it is a piping system designed for and above 0 but less than 105Kpa (15psi)"
: Mr. Sudharmin, this is not correct. 31.3 most certanly allows for pressures above 15psi.
: Regards,
: RB
: :
: : Acceptance criteria does not necessarily be the same when comparison is being made against different code requirements.
: : ASME Viii is a pressure vessel code, B31.1 - Power Piping and B31.3 - Process Piping.
: : It is true that B31.3 is less stringent but then again take note it is a piping system designed for and above 0 but less than 105Kpa (15psi)
: : : Dear Colleagues,
: : : After comparing the acceptance criteria from these 3 codes it seems like the acceptance for B31.3 is much less stringent then for the other two codes.
: : : Is this correct and does anbody know why this is? Or am I just overlooking something in B31.3?
: : : The acceptance for ASME VIII and B31.1 seem to be exactly the same. They don't allow linear discontinuities over 20% DAC and reject rounded discontinuities when they exceed a certain length and 100%DAC.
: : : As far as I can find; B31.3 does not reject rounded discontinuties. And linear discontinuties are allowed to have some length and are allowed to produce indications up to 100% DAC (similar as is allowed for the rounded indications in VIII and B31.1).
: : : Looking forward to an explanation.
: : : Kind Regards,
: : : Jarno de Jonge
------------ End Original Message ------------




 
 Reply 
 

Product Spotlight

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

NDT.net launches mobile-friendly design

NDT.net has revamped its website providing a mobile-friendly design.The front page received a comp
...
letely new design and all other sections are now reacting responsively on mobile devices. This has been a major step to make our website more user- friendly.
>

VeeScan AirCraft Wheel Inspection

The VEESCAN offers maximum flexibility, has a proven mechanical design and records of breakdown-fr
...
ee operation of over 365 days. Appealing to companies in the Aerospace industry, the VEESCAN is ideal for all wheel-testing environments. With a wide selection of probes, the VeeScan allows your wheel testing facility the flexibility to select the most compatible configurations with their workload.
>

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window