Typical specifications for UT crack tools are: detection of cracks with a minimum length of 20 mm (0.79 in) and depth of 1 mm (0.04 in) in base material and at welds, 2 mm (0.08 in) depth in welds. Most of these tools are sensitive enough to detect flaws with only 0.5 mm in depth. Last year in Chennai, four people were detained by the police under preventive detention laws in order to crack down on political activity in support of Sri Lankan Tamils.
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Our TechnologyUT CrackUltrasonic Crack Detection
Ultrasonic robots for crack detection contain transducers oriented at a different angle to the pipe wall. This ensures that ultrasonic shear waves propagate along a 45° path through the wall. Both internal and external cracks reflect the energy. Calculation of crack location is done with the time of flight; the crack depth is determined depending on the signal amplitude in relation to saturation amplitude of a reference reflector.
Cracks are most commonly situated along the long seam weld and are axial oriented of the pipe, due to the hoop stress. However, in girth weld areas circumferential oriented cracks can appear. Another occasion for these types of cracks may be high bending stresses which might be caused by geohazzards and pipeline movement.
Crack robots are available from 6' to 48', both orientations of cracks can be addressed. Combined inspection robots for wall thickness and crack inspection in one tool are also available, including multi diameter tools, e.g. 36'/48' corrosion/crack combo. Typical specifications for UT crack tools are: detection of cracks with a minimum length of 20 mm (0.79 in) and depth of 1 mm (0.04 in) in base material and at welds, 2 mm (0.08 in) depth in welds. Most of these tools are sensitive enough to detect flaws with only 0.5 mm in depth. In general the specification in length and depth is the same for cracks with different orientations. Cracks at and in welds are typically below 0.01 mm in width; the majority of SCC cracks is grouped around 0.01mm.
Conventional UT crack tools are able to detect cracks below 0.001 mm opening with high probability.
Crack Inspection Tools
Evo Series 1.0 UC fleet improves speed capabilities and resolution for crack inspections. A maximum inspection speed of 4 m/s and an axial resolution of 1.5 mm (0.06 in) has become standard. Robots can detect and size features with minimum dimension of 20 mm (0.78 in) by 1 mm (0.04 in) in base material at a POD greater than 90%.
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Brochure: EVO Series 1.0 UC
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NDT Global is a leading supplier of ultrasonic pipeline inspection and data analysis. A state-of-the-art inspection fleet provides the entire inline inspection service for onshore and offshore pipelines worldwide. The full range of services includes geometry and deformation inspection, metal loss and crack inspection and defect assessment.
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A Maltese Court recently ruled the detention of six people in the Safi detention camp beyond the formal limit of ten weeks on health grounds, illegal. On October 29 Maltese riot police rounded up detainees of the same facility for questioning following protests. Protests turned violent last week in the Ħal Far centre that is severely overcrowded.
In two separate case rulings came out in favor of all six asylum seekers, legally assisted by Aditus Foundation and the Jesuit Refugee Service. The six were detained for more than ten weeks on the basis of “reasonable grounds” to believe they carried contagious disease and as a result required medical screening. The court declared the ongoing deprivation of personal liberty unlawful and ordered their immediate release.
“The six judgements tell Government that the current detention regime has no legal basis and is therefore contrary to law. It is clear that Malta has been relying on health grounds as a detention basis when the reality is another one. Due to a stubborn refusal to invest in increasing Malta’s reception capacity to deal with the arrivals by sea, the system is at breaking point. Whilst we appreciate Malta’s limitations, we nonetheless insist that violating people’s fundamental human rights can never be part of the solution,” said the Director of Aditus Foundation, Dr. Neil Falzon.
Protests from other detainees at the Safi detention centre, stating that they are not criminals and demanding the EU to safeguard their rights, ended up in confrontation with service staff. Riot police arriving with shields and batons reportedly handcuffed and took detainees away in a police van.
According to eyewitnesses about 60 inhabitants of the reception centre in Ħal Far were involved in protests that turned violent on October 21 with Maltese Home Affairs Minister, Michael Farrugia setting the number as high as 300. Severe damage was caused to the centre when fires were lit and stones were thrown by frustrated inhabitants.
As reported by AIDA, managed by ECRE, the conditions in the Ħal Far and other open centres are “extremely challenging”: “low hygiene levels, severe over-crowding, lack of physical security, location of most centres in a remote area of Malta, poor material structures and occasional infestation of rats and cockroaches are the main general concerns expressed in relation to the Open Centres.”
The Correctional Services Agency of Corradino denies allegations of mistreatment of people involved in the incident at Ħal Far brought forward by several sources according to whom they were stripped down and hosed “like animals” and manhandled in prison by the Special Response Team using batons. Other allegations brought forward by local media include inhabitants as young as fourteen being left without food for days as the Agency for the Welfare of Asylum Seekers suspended daily meals following the violent protests.
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For further information:
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- ECRE, Op-ed: Detention by Default – a Maltese Betrayal, September 2019
- ECRE, Malta Charges Five Rescued Migrants with ‘Terrorist Activities’ while Facts Remain Unclear, April 2019
- AIDA, AIDA 2018 Update: Malta, March 2019
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Photo: (CC) Jacqueline Poggi, January 2015
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Roger nichols small circle of friends rar. This article appeared in the ECRE Weekly Bulletin . You can subscribe to the Weekly Bulletin here.