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 -

 4266 views
Technical Discussions
Mehmet BAL
Consultant
Turkey, Joined Nov 2003, 7

Mehmet BAL

Consultant
Turkey,
Joined Nov 2003
7
04:17 Feb-19-2004
RT Interpretation of ASME VIII Div.1

Hi Everybody,
Can any one help to interpret the acceptance criteria of ASME Section VIII Div.1 (UW-51) given below:
For full examination, any group of aligned indications that have an aggregate length greater than t in a length of 12 t, except when the distance between the successive imperfections exceed 6L where L is the length of the longest imperfection in the group.
Question:
1. From the above criteria what will be the distance between two close indications, or is there any maximum or minimum distance restriction?
2. How do you interpret when the distance between indications exceed 6L?
3. How do you interpret when the distance between indications less than 6L?
Your help will be appreciated.
Thanks
Mehmet BAL

 Reply

Ed T.
Ed T.
00:24 Feb-20-2004
Re: RT Interpretation of ASME VIII Div.1
----------- Start Original Message -----------
: Hi Everybody,
: Can any one help to interpret the acceptance criteria of ASME Section VIII Div.1 (UW-51) given below:
: For full examination, any group of aligned indications that have an aggregate length greater than t in a length of 12 t, except when the distance between the successive imperfections exceed 6L where L is the length of the longest imperfection in the group.
: Question:
: 1. From the above criteria what will be the distance between two close indications, or is there any maximum or minimum distance restriction?
: 2. How do you interpret when the distance between indications exceed 6L?
: 3. How do you interpret when the distance between indications less than 6L?
: Your help will be appreciated.
: Thanks
: Mehmet BAL
------------ End Original Message ------------

You would consider a group of aligned indications as, just that, a group. If this group length is greater than t or the wall thickness in any 12t it is rejectable.
For example, if the wall thickness is 2 and you have a group of aligned indications that are 2.5 long and is contained within 24", it is rejectable. (2 x 12=24)
Now if these indications are separated by more than 6L it would not be considered as part of the same group and evaluated seperately. 6L indicates 6 times the length of the longest indication.
For example if you have a group of aligned indications 2mm each. One indication is 3mm. 6x3=18. If successive indications are separated by more than 18mm then they are not part of the same group. This would also be cause to evaluate seperately.
It can be confusing, but I hope this helps.

 Reply

N.Kuppusamy
Consultant, NDT Level-III Engineer
Advanced Inspection & Testing (S) Pte Ltd, Singapore, Joined Dec 2003, 34

N.Kuppusamy

Consultant, NDT Level-III Engineer
Advanced Inspection & Testing (S) Pte Ltd,
Singapore,
Joined Dec 2003
34
00:59 Feb-21-2004
Re: RT Interpretation of ASME VIII Div.1
Interpretation of UW-51
ASME Section VIII Div.1 UW-51Paragraphg(b)(3)is appliacble to agroup of aligned indications.

1. In any group of indications if the aggregate length is less than t over the length of 12t, it is acceptable (irrespective of distance between successive indications) provided none of the indications in the group exceed the limitations given in UW-51 Paragraph (b)(2).

2. When the aggregate length exceeds t over the lenght of 12t & the distance between successive indications more than 6L of the largest indication it is acceptable. They may be evaluated as two individual groups over next 12t length from each group.

3. It is rejectable if the distance between successive indications less than 6L of the largest indication and the aggregate length exceed t over 12t weld length.

N.Kuppusamy
----------- Start Original Message -----------
: Hi Everybody,
: Can any one help to interpret the acceptance criteria of ASME Section VIII Div.1 (UW-51) given below:
: For full examination, any group of aligned indications that have an aggregate length greater than t in a length of 12 t, except when the distance between the successive imperfections exceed 6L where L is the length of the longest imperfection in the group.
: Question:
: 1. From the above criteria what will be the distance between two close indications, or is there any maximum or minimum distance restriction?
: 2. How do you interpret when the distance between indications exceed 6L?
: 3. How do you interpret when the distance between indications less than 6L?
: Your help will be appreciated.
: Thanks
: Mehmet BAL
------------ End Original Message ------------

 Reply

Mehmet BAL
Consultant
Turkey, Joined Nov 2003, 7

Mehmet BAL

Consultant
Turkey,
Joined Nov 2003
7
04:22 Feb-21-2004
Re: RT Interpretation of ASME VIII Div.1
Thank you very much for your clear explanation.
Mehmet BAL
----------- Start Original Message -----------
: Interpretation of UW-51
: ASME Section VIII Div.1 UW-51Paragraphg(b)(3)is appliacble to agroup of aligned indications.
: 1. In any group of indications if the aggregate length is less than t over the length of 12t, it is acceptable (irrespective of distance between successive indications) provided none of the indications in the group exceed the limitations given in UW-51 Paragraph (b)(2).
: 2. When the aggregate length exceeds t over the lenght of 12t & the distance between successive indications more than 6L of the largest indication it is acceptable. They may be evaluated as two individual groups over next 12t length from each group.
: 3. It is rejectable if the distance between successive indications less than 6L of the largest indication and the aggregate length exceed t over 12t weld length.
: N.Kuppusamy
: : Hi Everybody,
: : Can any one help to interpret the acceptance criteria of ASME Section VIII Div.1 (UW-51) given below:
: : For full examination, any group of aligned indications that have an aggregate length greater than t in a length of 12 t, except when the distance between the successive imperfections exceed 6L where L is the length of the longest imperfection in the group.
: : Question:
: : 1. From the above criteria what will be the distance between two close indications, or is there any maximum or minimum distance restriction?
: : 2. How do you interpret when the distance between indications exceed 6L?
: : 3. How do you interpret when the distance between indications less than 6L?
: : Your help will be appreciated.
: : Thanks
: : Mehmet BAL
------------ End Original Message ------------

 Reply

04:23 Jul-27-2005

# You may find it interesting to take a look at the sites in the field of...

 Reply

Imtiyaz Ahmad
Imtiyaz Ahmad
20:27 Jul-09-2014
Re: RT Interpretation of ASME VIII Div.1
In Reply to Mehmet BAL at 04:17 Feb-19-2004 (Opening).

Suppost the Thickness of the Weld is 10 mm and We have to see in the Film of 12t means 120 mm... and It is Written the Aligned Indication Greater than T means Indication Legth is more than 10 mm, Suppose 13 mm (Supposte 4 Indication are there 4mm, 5mm, 6 mm,) but the Differnce Between the Indication Shall be Checked According to the Largest Indication ... 6T means the gap bwetween the Indication shall be of 6t atleast or greater otherwise its a repari

 Reply

LanhHuyet
NDT Inspector,
Vietnam, Joined Jun 2013, 25

LanhHuyet

NDT Inspector,
Vietnam,
Joined Jun 2013
25
05:08 Feb-09-2015
Re: RT Interpretation of ASME VIII Div.1
In Reply to N.Kuppusamy at 00:59 Feb-21-2004 .

Please explain me : What is aggregate length ? Is the sum of the length of indications or the length from starting point of first indication and the end point of second indication.For example first indication has the length 3mm,the second has the length 2 mm? the distance between them are 2mm.What is the aggregate length in this case ? 3+2 =5 or 3+2+2 = 7 ?

 Reply

Lanh Huyet
NDT Inspector,
Vietnam, Joined Jun 2013, 25

Lanh Huyet

NDT Inspector,
Vietnam,
Joined Jun 2013
25
10:23 Feb-10-2015
Re: RT Interpretation of ASME VIII Div.1
In Reply to LanhHuyet at 05:08 Feb-09-2015 .

Hope to have the help from all of you for this problem.

 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.
>

#### NOVO Armor 15 & NOVO Armor 22

The Armor Kit Contains the NOVO Armor, which provides additional mechanical protection to the NOVO 1
...
5WN & NOVO 22WN Detectors, the Armor Stand and a traveling soft cover. - Newest shock absorbent technology case - Water resistant design - Supports wired & wireless communication - Multiple positioning options - Tripod connection using the Built-in 1/4” threads - Simple Detector battery replacement
>

#### Research and Application Development For NDT

Acuren’s Research and Application Development specializes in the development of advanced ultraso
...
nic inspection techniques and systems for challenging inspection applications, with an emphasis on practical solutions which are field deployable. Services include manual and automated ultrasonic inspection system development, inspection technique optimization using laboratory scale studies and ultrasonic modeling (CIVA, BeamTool), preparing technical justification for technique evaluation and qualification (Probability of Detection and sizing accuracy studies), inspection/calibration/analysis procedure preparation to support field deployment of custom techniques, and development of custom imaging algorithms to support challenging inspection applications.
>

#### ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

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