OUR Services

Non Destructive Tests Services (NDT)

We provide NDT services to assist with integrity appraisal at fabrication, in-service or decommissioning stage. Our range of NDT services cover standard NDT methods and the advanced techniques.

Non-destructive testing from OIS ensures the safe and efficient operation of your equipment and assets by detecting defects before they result in severe damage, and assures compliance with international standards.

OIS, we consistently review our operating procedures to suit current changes in NDT standards.

Call us today should you need any or the combination of the NDT services offered by OIS:

Magnetic Particle Inspection otherwise known as MPI is a method that can be used to find surface and near surface flaws in ferromagnetic materials such as steel and iron it is primarily used for crack detection.

Magnetic particle testing works by magnetizing a ferromagnetic specimen using a magnet or special magnetizing equipment. If the specimen has discontinuity, the magnetic field flowing through the specimen is interrupted and leakage field occurs. Finely milled iron particles coated with a dye pigment are applied to the specimen. These are attracted to leakage fields and cluster to form an indication directly over the discontinuity. The indication is visually detected under proper lighting conditions.

The basic procedure that is followed to perform magnetic particle testing consists of the following:

Pre-cleaning of component

Introduction of Magnetic field

Application of magnetic media

Interpretation of magnetic particle indications our experienced and qualified NDT inspector.

Dye Penetrant Inspection, also known as Penetrant Testing (PT), Liquid Penetrant Inspection (LPI) or Fluorescent Penetrant Inspection (FPI).

Liquid penetrant is applied to the surface and left to soak, being drawn into any cracks by capillary action. Excess penetrant is then removed and a developer applied to draw out the penetrant from cracks, to enable a visual Inspection of any defects. Accurate interpretation is achieved by utilizing our seasoned NDT qualified Penetrant Testing Inspectors.

Dye Penetrant Inspection can be used on almost any non-porous material.

The types of defects that can be found with penetrant testing are:

Rolled Products: Penetrant identifies anomalies (cracks, seams or laminations)

Castings: cold shuts, hot tears, porosity, blow holes or shrinkage

Forgings: Illuminating cracks, laps or external bursts

Welds: To identify cracks, porosity, undercut, overlap, lack of fusion or lack of penetration

Most of our customers are consistently opting for Eddy current testing due to inherent benefit of non-requirement of paint removal prior carrying out Inspection on a system which is a drawback in the conventional NDT method of MPI. Eddy current testing eliminates the need of surface preparation and saves lot of time in paint removal and re-application of paint post Inspection. Typical site applications include Inspection of crane jibs, pedestals, pad-eyes (pre and post loading), drilling derrick substructures and wind turbine towers.

Eddy Current Testing is sensitive to small cracks and other defects. Inspection gives immediate results and detects surface and near surface defects.

OIS uses the latest sets of state of the art Eddy Current Testing for Inspection.

As this is an advanced NDT method of Inspection, skill and experience are required. With over 10 years of experience in this field we are able to understand the Inspection readings.

We have available more than twenty (20) experienced ET technicians that are SNT Level II Eddy Current Testing qualified in compliance with SNT-TC-1A. As a minimum, all OIS Eddy Current Inspection engineers have more than one NDT qualification.

Visual Inspection, with or without visual aids, is the original and still highly effective method of NDE. Many defects can be detected by careful direct visual Inspection. Optical aids used include low power magnifiers, microscopes and telescopes. Borescope’s, endoscopes and other fiber-optic devices are used for Inspection of areas with restricted access. These devices can be used with television camera systems. High-speed visual Inspection may be used for tubular components.

Ultrasonic Testing uses sound waves of short wavelength and high frequency to detect flaws or measure material thickness as an NDT method. Ultrasonic Testing is used to test welds, castings and wrought products such as rolled plate or forgings.

The detection and location of discontinuities is enabled by the interpretation of ultrasonic wave reflections generated by a transducer.

Information from ultrasonic Inspection can be presented in a number of formats:

A - Scan displays the amount of received ultrasonic energy as a function of time

B - Scan displays a profile view (cross-sectional) of a specimen

C-Scan displays a plan type view of the specimen & discontinuities

The relationship of flaw size, flaw distance and flaw reflectivity are complex and considerable skill is required to interpret the display. With over 10 years of experience in this field we are able to understand and give actual interpretation of Inspection exercise.

We have available more than thirty (30) experienced UT technicians that are SNT Level II Ultrasonic Testing qualified in compliance with SNT-TC-1A. As a minimum, all OIS ultrasonic testing Inspection engineers have more than one NDT qualification.

EMI 1 Inspection method is applied to drill pipe tubes. It involves full length scanning (excluding upsets) of drill pipe tubes using the longitudinal field (transverse flaw) buddy type unit. Evaluation includes flaws such as fatigue cracks, corrosion, pits, cuts, gouges, and other damage that exceed the specified acceptance limits.

OIS can provide full range of pipe Inspection ion sizes ranging from 2-3/8" to 6.5/8" while following customer's specifications and edition of DS-1 or API guidelines. We have state-of-the-art tube Inspection equipment to meet API Inspection requirements or third party inspections, including full-length wall thickness measurement of the pipe tubes. Also have various types EMI of units, conventional ones as well as dual-function units with wall monitoring.

Inspection services includes:

• Visual body and thread Inspection

• UT Thickness Gauging

• Thread gauging

• End Area Inspections

• Electromagnetic Inspection (EMI)

• Ultrasonic Inspection On End Area

• Wet and Dry Magnetic Particle Inspection

• Dimensional Inspection

We also can provide refacing, straightening and pipe internal and external cleaning services.

Used casing and tubing Inspection is carried out in accordance with API Spec 5CT. The general scope shall include:

• OD Blasting

• ID Cleaning

• Spot Wall Thickness Measurements

• Grade Sorting

• EMI on Body (Tubing)

• Visual Thread Inspection

• Full Length Drifting

• Black Light Inspections

• Hydraulic Pressure Testing

• Bucking Services

Depending on client’s requirement, the general scope or part of the scope may be covered. Our experienced inspectors follow industry standard guidelines and documented Standard Operating Procedures for casing and tubing Inspection.

OIS state of the art EMI units are dual-function units with Hall Effect sensors. As they are all mobile units our Inspection technicians are able to move units to work locations at short notice.

OIS state of the art EMI units are dual-function units with Hall Effect sensors. As they are all mobile units our Inspection technicians are able to move units to work locations at short notice.

We provide BHA Inspections on any drilling component used in the industry.

Bottom Hole Assembly otherwise known as BHA inspections are carried out as per latest editions of DS-1 Cat 3-5 and API guidelines. BHA inspections services include:

• Visual Inspections

• Thread Gauging

• Wet and Dry Magnetic Particle Inspection

• Dimensional Inspection

Optional service of refacing if required can be provided.

We have fleets of BHA Inspection units that are available in our tubular goods Inspection facility and can also be moved to clients’ facility.

Upon completion reports are generated and made available on web for ease of access to our customers who usually are given unique password as part of the Inspection package. Hard copies could also be given upon request.

Our comprehensive rod Inspection and reconditioning services are performed according to API standards. Rod Inspection helps reduce well operating costs by extending the life of the rod and minimizing the risk of future well failures.

A large valve at the top of a well that may be closed if the drilling crew loses control of formation fluids. By closing this valve (usually operated remotely via hydraulic actuators), the drilling crew usually regains control of the reservoir, and procedures can then be initiated to increase the mud density until it is possible to open the BOP and retain pressure control of the formation. BOPs come in a variety of styles, sizes and pressure ratings. Some can effectively close over an open wellbore, some are designed to seal around tubular components in the well (drillpipe, casing or tubing) and others are fitted with hardened steel shearing surfaces that can actually cut through drillpipe. Since BOPs are critically important to the safety of the crew, the rig and the wellbore itself, BOPs are inspected, tested and refurbished at regular intervals determined by a combination of risk assessment, local practice, well type and legal requirements. BOP tests vary from daily function testing on critical wells to monthly or less frequent testing on wells thought to have low probability of well control problems.


Inspection & Load testing of cranes and all lifting appliance

Mobile cranes

Overhead cranes



Earth moving equipment (Shovel, excavator, Backhoe loader, Compactor Roller, Grader)

Inspection of lifting accessories ( Lifting gears )







Other lifting tools

Inspection and load test of lifted equipment




Lifting & spreader beams

Planning and supervising of lifting operations

Lifting operations need to be properly planned by a competent person who has both practical and theoretical knowledge, and who has experience of planning lifts. The lifting plan needs to consider the risks involved, the equipment needed, the procedures for the lift, and who has to do what. OIS provide the qualified competent lifting engineer who can insure that the operation goes smoothly and safe


Dropped objects survey and training

OIS provide qualified inspectors to conduct a thorough dropped objects survey of the Derrick/Mast and agreed surrounding areas, documenting findings with photographic support and providing recommendations for their rectification.

Scaffolding Inspection

Scaffolding Inspection

Our scaffolding inspection service provides competent and expert advice from professional qualified scaffolding safety inspectors who all are extensive expertise of working at height safety requirements.

We can tailor our services to meet the exact needs and objectives of clients wanting to implement best practice health and safety initiatives.


A process in which a wear-resistant alloy is applied to the tool joints of drillpipe or drill collars to prolong the life of oilfield tubulars. Hardbanding is applied where rotational and axial friction associated with drilling and tripping create excessive abrasive wear between drillstring and casing, or between drillstring and rock. Hard alloy overlays are applied to the points of greatest contact, typically using advanced welding techniques. Typical alloys used in this process range from ultra-wear resistant tungsten carbide, to less abrasive chromium carbide, titanium carbide and borides. Some hardbanding processes take a different approach to reducing wear in tubulars, using materials that achieve a low coefficient of friction used to protect the drillstring from abrasion.

Sand Blasting

Sand-blasting machines are typically employed in projects requiring a uniform matte texture. The process (also known as beadblasting) forces sand, steel shots, metal pellets or other abrasives into a substrate at high speed. This results in a smooth, clean product texture, particularly in soft metals.

Pressure Test

Also known as leakoff test, a test to determine the strength or fracture pressure of the open formation, usually conducted immediately after drilling below a new casing shoe. During the test, the well is shut in and fluid is pumped into the wellbore to gradually increase the pressure that the formation experiences. At some pressure, fluid will enter the formation, or leak off, either moving through permeable paths in the rock or by creating a space by fracturing the rock. The results of the leakoff test dictate the maximum pressure or mud weight that may be applied to the well during drilling operations. To maintain a small safety factor to permit safe well control operations, the maximum operating pressure is usually slightly below the leakoff test result.


Removing the mud deposits, scale, and rust from the drill pipe is a very important part of the Inspection process. Many mud additives contain chemicals, that if left on the pipe, can accelerate the effects of corrosion. Therefore, all pipe is thoroughly cleaned prior to Inspection and coated with corrosion inhibitor following the Inspection process.

Our brushing unit is designed to remove rust, scale and dried drilling fluid over the entire length of the pipe tube.

Pipe Straightning

Our portable pipe straightening unit is unmatched in its ability to efficiently straighten tubular materials. This service restores crooked or corkscrewed pipe to a usable condition. Using hydraulic components, the pipe is rotated while pressure is applied over the full length of the pipe.

Bucking Machine

OIS bucking units are coupling application machines (CAM) used to make up and break out tubular goods. The machines are developed for both standard applications and connection challenges encountered in threading and repair shops, pipe yards, and completions. Modular customization of the units and powerful accessories enable the skillful makeup and breakout of various tubular connections.

The bucking units product line includes the ComCAM unit for rotational applications and the TorkWizard™ and TorkWrench™ units for nonrotational applications. For rotational makeup/breakout with the ComCAM unit, the advanced torque-process-control (TPCPro) computer analysis system monitors the torque curves.

OIS provides a worldwide network for optimum support of these units. Related service offerings include tubular management services, which supply casing and pipe yard services, inventory management, and pipe preparation prior to dispatching to the wellsite.

Hydro Blasting

Hydroblasting is capable of cutting through grime, deposits and manufacturing fouling – and then slicing through hard surfaces with unprecedented cutting power. It is the most versatile technology available to industry. A blast of water, with an added abrasive, under extreme pressure, results in unparalleled power.


Any thin material, liquid or powder, which, applied over a structure, forms a continuous film to protect against corrosion. Corrosion coatings should possess flexibility, resistance against impact and moisture, good adhesion and cohesion, and chemical resistance to the exposure conditions (such as temperature, hydrogen sulfide). Organic coatings such as polyethylenes (plastic) are normally used for external protection of pipelines while asphalt and coal tar enamels are used to protect buried pipes or undersides of oilfield tanks. Inorganic coating such as zinc-silicate is used to protect drilling and production platforms above the splash zone and nickel phosphate coating is used to protect packer body parts.

Mast Structures

The structure used to support the crown block and the drillstring. Masts are usually rectangular or trapezoidal in shape and offer a very good stiffness, important to land rigs whose mast is laid down when the rig is moved. They suffer from being heavier than conventional derricks and consequently are not usually found in offshore environments, where weight is more of a concern than in land operations.

Wall Thickness

An in-situ measurement of the thickness of a casing or tubing string using an electromagnetic technique. The result is presented as a type of casing-Inspection log, giving an estimate of metal loss and detecting corrosion. In the usual method, a coil centered inside the casing generates an alternating magnetic field. Another coil farther up the tool measures the phase shift introduced by the casing. This phase shift depends on the casing-wall thickness and internal diameter, as well as the casing conductivity and magnetic permeability. The effects change at different frequencies, so that by varying the frequency, the thickness and internal diameter can be uniquely determined. Electromagnetic thickness can also be measured using other techniques, for example from a casing-potential profile or a flux-leakage measurement.

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