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Advanced Non-Destructive Testing for Tanks and Pipelines
Algeria, November 2016
Params. K
2Advanced NDT for Tanks and Pipeline
Details of Selected Advanced NDT Techniques
On-Line Inspection
► What is On-Line Inspection ?
• Check the Mechanical Integrity of Assets (pipelines, vessels, storage tanks Etc.) without removing them fromservice
• Purpose of On-Line inspection is to provide the maximumpossible level of real world intelligence and information for the planning of a forthcoming shutdown
► Benefits of On-Line Inspection
• Optimize the Shutdown Inspection Schedule
• Eliminate an unplanned shutdown
• Eliminate unnecessary & costly removal of insulation
• Eliminate unnecessary & costly process of taking storage tanks offline
• Enormous cost savings $$$ms
• Reduction in NDT resource requirement
3Advanced NDT for Tanks and Pipeline
Pipeline AUT for Onshore & Offshore
► Context
Automated Ultrasonic Testing is a latest Technology to inspect Pipeline Girth welds by using combination of Phased Array UT and TOFD.
► Advantages
• High Productivity
• Permanent Record
• Precision control of Inspection
• Better welding process control through rapid feedback
• Improved defect sizing
• Development and use of ECA
► Applications
• Diameter Tested : 4.5 to 48 inch
• Thickness Tested : 6.35 to 50.2 mm
• Total length of Onshore Pipeline Inspected – 3525 Kms
• Total length of Offshore Pipeline Inspected – 1600 Kms
AUT General Qualification as per DnV Standards
4Advanced NDT for Tanks and Pipeline
Weld Testing by PAUT & TOFD
► Context
Welding defects can compromise the stability and integrity of a welded structure. When you need confidence in testing of welds, PAUT & TOFD, a high performance non-destructive testing (NDT) technique offers you accurate detection of cracks, slag and lack of fusion.
► Advantages
• Radiation free ultrasonic technique
• Welds from 3/4 inch in diameter
• Wall thicknesses from 5mm
• Battery operation and irrigation system
• Rapid inspections with digital recording of data
• Highly sensitive to fusion face flaws
► High Temperature Applications
• For High Temperature Application up to 480 Deg C
• X & Y axis scanner
• 3D Image
PHASED ARRAY ON SS/DSS/9% Ni WELDS To avoid the use of RT offshore / Onshore
5Advanced NDT for Tanks and Pipeline
Long Range Ultrasonic Testing & Conventional UT
6Advanced NDT for Tanks and Pipeline
Long Range Ultrasonic Technique (LRUT)
► Context
LRUT waves are ultrasonic waves that propagate along the length of a structure, guided by and confined in the geometric boundaries of the structure.
LRUT inspection is used as a screening tool for online Pipe testing, overhead piping, Cross country pipe line, Refineries
► Advantages
• No need to remove complete insulation for inspection
• High Temperature Application
• Rapid scanning tool
► Applications
• Road and river crossings
• Power plant tubing
• Risers
• Pipework
• Jetty lines & Jetty Supports
• Tank farm link lines
• Sphere legs
• Spiral welded pipe
• Sprinkler systems
7Advanced NDT for Tanks and Pipeline
Short Range Guided Wave Ultrasonic Technique (SRGUT)
► Context
SRGUT was designed to test the annular plate of above ground storage tanks while the tank remains in-service.
The technique is also being used to test for corrosion under pipe supports, corrosion at soil air interfaces, and similar difficult to access locations
► Advantages
• Rapid scanning
• By using multi frequency can identify all indications
• 100% of surface area Coverage (up to 2m length)
► Applications
• Tank Floor Annular Plate Testing
• Testing Concrete Coated Interfaces
• Testing Under Pipe Supports
• Scan Under Vessel Supports
8Advanced NDT for Tanks and Pipeline
Acoustic Emission Testing
► Context
A phenomenon of ultrasound wave radiation in materials undergo deformation and fracture processes. When a material undergoes stress or a series of internal changes such as corrosion, it generates energy from localized sources which produces sound waves.
Acoustic emission testing is a non-destructive testing method designed to monitor sound waves emitted during material stress or failure.
► Advantages
• 100% floor inspection
• Verified reliability
• Significant money savings - No money wasted for opening of good tanks
• Ideal tool for application of risk-based inspection plans.
• Prevention of environmental losses - Early identification of potential leaks.
• Very fast, low-cost inspection with minimal interruption of operations and tank usage
► Applications
• Corrosion & Crack Detection
• Identify stress risers
• Pre-Shutdown activities
9Advanced NDT for Tanks and Pipeline
Flange Face Testing by Using PAUT
► Context
Crevice corrosion is a well known damage mechanism in industry. The crevice between two adjoining flanges is the ideal environment for crevice corrosion to initiate.
Corrosion of the sealing area can cause loss of containment leading to catastrophic effect.
► Advantages
• Condition assessment of the sealing area without separating the flanges
• Increased safety due to the reduced potential for exposure to hazardous chemicals when separating the flanges
• Inspection while the equipment is on-line
• Planning for repair well in advance
► Applications
• On-line Flange Testing
• Pre-Shutdown Inspection
• Crack detection
• Detection of SCC in complex Flanges
10Advanced NDT for Tanks and Pipeline
Automatic Corrosion Mapping / HIC / HTHIC
► Context
Corrosion and erosion can inflict significant damage upon petrochemical vessels and pipework. Other phenomena such as HIC & HTHAC can also prove costly in plant operation.
Due to the risks involved, it is important to recognize corrosion damage as early as possible.
► Advantages
• Eliminating the need to use scaffolding or rope access
• Maximize the ability to detect corrosion
• Permanent hard and soft copy record
► Applications
• Above and below ground storage tank floors, shells and roofs
• Pressure vessels including identification of hydrogen blistering
• Process pipe work
• Offshore loading /unloading jetty lines
• Ships hulls and similar marine vessels
11Advanced NDT for Tanks and Pipeline
Scorpion for Tank Inspection
Scorpion B-SCAN imaging system is developed to performUltrasonic thickness measurements on ferrous material.
It can be used on vertical and horizontal surfaces like oil storagetank and pressure vessels.
The minimum diameter the crawler can inspect:1. Outside= circumferential is 1.5m and axial is 1.5m2. Inside= circumferential is 3m and axial 1.5m
The maximum surface temperature scorpion B-SCAN crawler canoperate is 80°C
Thickness measurement ranges from 2.5mm to 100mmapproximately
12Advanced NDT for Tanks and Pipeline
Inspection of Storage tanks, shells both external and internal surfacesInspection of tank roof plates Corrosion mapping of pipeline
Applications of Scorpion
13Advanced NDT for Tanks and Pipeline
Pulsed Eddy Current Testing
► Context
Pulsed Eddy Current is a unique corrosion survey method that allows to inspect ferrous materials with Insulation / Thick Coating / Concrete etc
Measurements can be performed with insulation, asbestos, fireproofing, concrete or coating
► Advantages
• Wide temperature range: -100 to 550 C (-150 to 1000 F)
• Very good reproducibility of PEC readings
• at the same locations, typically ±0.05 mm
• There is no need for surface preparation
• The high costs for removal of insulation can be avoided
• Scaffolding can be reduced by using rope access or by using an extension pole or robotic crawler
► Applications
• Inspection Of Jetty support legs
• Support Legs of Tanks
• Inspection on rough surface
• Sheet piling Inspection
14Advanced NDT for Tanks and Pipeline
Implementation of PEC
The PEC probe is usually portable and can often be used by a single operator. A dedicated jig has been developed to enable safe, fast and accurate data collection on the legs of storage spheres.
A detailed visual inspection is carried out to look for signs of degradation, and PEC technology is used to measure the wall thickness of the metal behind the fireproofing.
Inspection of column skirt through fire proofing bricks
Inspection of a storage sphere legs
15Advanced NDT for Tanks and Pipeline
Testing & Results of PEC
5 1
4 2
3
Typical 2D color plot and legend
h12
Pipe inspection direction
16Advanced NDT for Tanks and Pipeline
Online robotic tank bottom inspection (OTIS)
Uses submerged UT sensors to detect any variations in tank bottom thickness.
The scan provides you with an API certified inspection of your tank bottom.
Acquires detailed information about the amount of topside and bottom side corrosion, the thickness of the tank floor, the presence of floor or shell settling and the precise location of this information.
If the tank's product has any optical clarity, then its camera can provide a video record of the tank's interior.
Collects thousands of UT data samples.
Eliminates the Shutdown costs
All work is according to API 653 standards
Inspection generates no waste You are ensured of safer operations.
17Advanced NDT for Tanks and Pipeline
IR Thermography
Infrared thermography is equipment or method, which detects infrared energy emitted from object, converts it to temperature, and displays image of temperature distribution
FIELD APPLICATION Preventive Maintenance Condition Monitoring Energy Performance Furnace & Boilers Mechanical Friction Tanks & Vessels Fluid Flow Problems
18Advanced NDT for Tanks and Pipeline
External Corrosion Mapping by Laser Technology
19Advanced NDT for Tanks and Pipeline
The LIXI PROFILER FOR CUI
A major inspection challenge facing the factory process industries is how toexamine insulated piping for blockage and corrosion, especially for corrosionunder the insulation and internal erosionHow It Works – Using a Very Low Source X-RAY Tube with a Digital Phosphate Screen real time x-ray of the external surface of the pipe and insulation can be viewed, recorded, captured and reported.
Real Time X-RAY CUI Inspection is extremely quick able to scan hundreds of feet of pipe daily. .
Used on Short and Long Insulated Piping
Used On Sphere Tank Legs With Fireproofing
Expandable system for 2” up to 36” D. Pipe
Able to look in odd geometric components
I.E. Elbows, Flanges, Valves and Similar
Offshore Risers with Neoplene Coating
20Advanced NDT for Tanks and Pipeline
Digital Radiography
Digital Radiography is similar to RT
Content Digital Radiography Radiogrpahy
Source X ray and Gamma Ray X ray and Gamma Ray
Receiver Electronic Plate Film
Flexibility Fixed and Regid Flexible
Reusing of Receiver
Can be Re Usable Can not be Re Usable
Processing time Quick and 1min 40 min
21Advanced NDT for Tanks and Pipeline
Vacuum Box testing as per API 653
Vacuum box testing is required for:
new shell-to-bottom welds, unless diesel tested
new bottom welds, unless tracer gas tested
new roof plate welds for tanks designed to be gas tight
potential bottom plate leak paths
patch plates welded on to the bottom
bottom plate restored by welding
22Advanced NDT for Tanks and Pipeline
MFL for Tank floor Inspection
MFL Floor map Scanner
Hand Scanner For Inaccessible areas
23Advanced NDT for Tanks and Pipeline
DESIGN REVIEW SERVICES
Storage tanks require detailed design review & inspection during the manufacturing
stage. Effective inspection ensures code compliance and prevents premature failure.
Following design review services are offered during the design & construction stage of
storage tanks:-
► Design Review as per API 650, IS 803, API 620 codes
► Review of fabrication drawings
► Tank-farm Piping
► Tank Foundations
► Instrumentation & Electrical items associated with
Storage Tanks
► Fire fighting system including sprinkler, foam & smoke
detection system
► Compliance to MB Lal committee recommendations
EEMUA
24Advanced NDT for Tanks and Pipeline
Project: Technical Due Diligence for Petroleum Storage Terminal
Scope: Physical verification & document review of the terminal
equipment i.e. storage tanks (22 Nos.), spheres (03
Nos.),associated piping, E&I, Civil Foundations etc.
Agency for AIM Services
Technical Due Diligence (TDD) of Storage Tank Terminal
• Visual inspection (VI).
• Review of documents i.e.
standard maintenance practices,
NDT records, safety procedures,
instrument calibration records
etc.
• Condition Assessment of the
entire facility including Storage
tanks, Piping, E&I, Civil
Foundations
Client
25Advanced NDT for Tanks and Pipeline
Project: In-service Inspection of Storage Tank as per API 653 Guidelines, at SHELL Markets India Pvt. Ltd. Mumbai.
Scope of work: Performing NDTs such as MFL on Bottom plates, Crawler UT (Scorpion) on Shell plate & UTG on Sump, Nozzles & Roof.
In-service Inspection of Storage Tank as per API 653 Guidelines –On going (till Jan 2017)
NDTs such as MFL on Bottom plates, Crawler UT (Scorpion) on Shell plate & UTG on Sump, Nozzles & Roof.Equipment to be inspected:Storage Tanks
Agency for AIM
Services
Agency for NDTNo Of Tanks : 58
26Advanced NDT for Tanks and Pipeline
Project: In-service Inspection of Storage Tank as per API 653 Guidelines, at SHELL Markets India Pvt. Ltd. Mumbai.
Scope of work: Performing NDTs such as MFL on Bottom plates, Crawler UT (Scorpion) on Shell plate & UTG on Sump, Nozzles & Roof.
In-service Inspection of Storage Tank as per API 653 Guidelines @ July 2015
NDTs such as MFL on Bottom plates, Crawler UT (Scorpion) on Shell plate & UTG on Sump, Nozzles & Roof.Equipment to be inspected:Storage Tanks
Agency for NDT
No Of Tanks : 3
27Advanced NDT for Tanks and Pipeline
Project: In-service Inspection of Storage Tank as per API 653 Guidelines, at SHELL Markets India Pvt. Ltd. Mumbai.
Scope of work: Performing NDTs such as MFL on Bottom plates, Crawler UT (Scorpion) on Shell plate & UTG on Sump, Nozzles & Roof.
In-service Inspection of Storage Tank as per API 653 Guidelines @ Aug 2016
NDTs such as MFL on Bottom plates, Crawler UT (Scorpion) on Shell plate & UTG on Sump, Nozzles & Roof.Equipment to be inspected:Storage Tanks
Agency for AIM
Services
Agency for NDTNo Of Tanks : 3
28Advanced NDT for Tanks and Pipeline