VISOSCOPE
This unit is constructed and built to inspect and examine the internal surface of tubing by means of a centralized optical lense - tube combination.
Assembly and Operation of Visoscope
The halide bulb (no. 2, 500 W Q/CL) is to be screwed into fitting no. 1.
The connector ring no. 3 has to be connected with the contact pin of fitting no. 1 and has to be fastened to spacer no. 4 onto spacer no. 4 the objective no. 5 has to be screwed.
On top of this, the centralize no. 6 will be slipped. Then the main tube no. 7 has to be pushed through centralize and screwed to objective. This tube is marked by a Black paint band or with inscription Main Tube or Ausblick.
When required, again centralizes no. 6 and tube extensions no. 8 to 12 are attached and then the ocular no. 13 is screwed on.
The lead should be taped to the tube to protect it from abrasive wear or squeezing or tearing off. Then the tool can be connected to 115 V/A.C.
The ocular can be focused by turning the hand- ring at ocular.
The tools must be cleaned after use and protected by rubber caps when placed back into storage case.
VISOSCOPE.
SPECIAL END AREA
The equipment and inspection techniques preferred consist of a DC active field wet magnetic particle inspection (dry magnetic also acceptable) for external areas and a scan ultrasonic inspection of the internal area. Various other methods and equipment exist for performing this inspection but these must be approve by GUPCO prior to inspection. The tube body from the tool joint taper back 36 inches will be inspected.
• Active Wet Fluorescent Method With DC Coil
• Clean box O.D. and end areas for a distance of 36 from tool joints. Use cup brushes and solvent (not diesel or Gasoline) as necessary. All traces of loose rust, scale. Corrosion and thread compounds must be removed.
• Using a DC coil establish a longitudinal field at 1200 amp turns per inch of tube O.D.
• With the current on, apply the particle bath to the box O.D. and end areas and allow a few seconds for the particles to migrate to a discontinuity. Be sure tube body is covered 100% with solution. Check underside of tube for dry spots or gaps. Use a magnetic pentameter to verify field strength and direction.
• Remove the field. Examine the part in a darkened area for evidence of any defects. If an inspection cape is used be sure it does not drag across the piece to be inspected or adjoining parts already sprayed as this may distort or remove any indication.
• Evaluate indications. Any cracks or crack indications are cause for rejection. Special attention should be paid to slip areas and the immediate area outside the internal upset.
• All quality control measure pertaining to black lights and solutions quality and particle concentrations will be followed. Light buffing and filing are allowed on indications that are not clearly cracks. After buffing or filing pieces must be re-inspected.
AC Active Field Dry Magnetic With Yoke (alternative)
• Clean box O.D. and end areas for a distance of 36 from tool joints. Use cup brushes and solvent (not diesel or Gasoline) as necessary. All traces of loose rust, scale, corrosion and thread compounds must be removed. Surfaces must be dry.
• Apply a continues bi-directional magnetic field (45 degree) using an electromagnetic hand held Yoke.
• Roll the pipe slowly and only inspect that part between the Yoke probes to approximately 1 outside. Maximum spacing between probes should be 12. Overlap subsequent passes by 2-3 inches. Sprinkle or blow the magnetic powder onto the part to insure adequate coverage.
• Perform an inspection on both ends of the pipe to a distance of 36 from the shoulder, including the upset and box O.D. Any fatigue cracks or crack indications will be considered reject able. Light buffing and filing are allowed on indications that are not clearly cracks. After buffing or filing pieces must be re-inspected.
2) ULTRASONIC INTERNAL / EXTERNAL END AREA
This procedure is used to examine slip , upset and end areas of drill pipe using multiple shear wave probes and equipment . This method is used to detect transverse defects on inside and outside surfaces.
• Ultrasonic instruments used will be of the pulse echo type with an A -scan presentation (CRT Screen). The unit will have calibration gain adjustment in steps of 1-2 db. An amplitude analog gate shall be incorporated into the system, which is capable of monitoring the entire CRT width. Gate shall contain both audible and visual alarms. A multiplexed shall be used that is capable of exciting the minimum number of transducers used in the shoe system with a repetition rate of 1250 Hz per channel. Minimum number of transducers to be used is three. More are acceptable. Separate gain controls for each transducer will be provided and provisions will exist for isolating individual transducers. Transducers used in the scanning head and for prove up shall have a frequency between 2.25 and 5.0 MHz. Transducers shall be a maximum of ½ X ½. Refracted entry angle shall be approximately 45 degrees. Instrument shall be calibrated annually for screen linearity as well as accuracy of gain control per ASTM E 317.
• The couplant used shall be capable of sufficiently wetting the surface and have an acoustic impedance as close to the test material and transducer as possible. Water is acceptable as long as proper wetting agents are added. A couplant delivery system is needed for the scanning head and shall deliver sufficient volume to allow continues contact with the test material without loss of signal. Spot placement of higher viscosity couplant is permissible for prove up of indications with a single probe If desired. The couplant used shall be the same as that used to calibrate the unit.
• Sensitivity calibration will be accomplished with a calibration standard with the same outside diameter wall thickness and acoustic properties as the material to be inspected. The standard shall contain notches on the inside and outside surface of the standard, which are 5% of nominal wall thickness in depth. Notches shall be a maximum of 1-1/2 inches long and .40 wide.
• A screen width standard for distance calibration machined from a block with similar acoustic properties will be used. Block dimensions should be twice the expected nominal wall thickness. A standardized one-inch block is acceptable.
• Calibrate the minimum screen width to equal twice the expected nominal wall thickness using the distance standard. Calibrate unit sensitivity using the notched standard. Using the step feature isolate transducer #1 and scan the O.D. notch. Peak the signal and adjust the amplitude to equal 50% of full screen height using the gain controls in the multiplexed. Repeat for other transducers. Scan the I.D. notch with all transducers. If signal height is less than 50% adjust the main unit gain controls so the signals equals 50%. Calibrate prove up unit similarly except that I.D. notch will be adjusted to 80% FSH. Note gain settings. Establish a skip position. Check Calibration every 25 joints for both scan and prove up unit.
• Clean box O.D. and end areas for a distance of 36 from tool joints. Use cup brushes and solvent as necessary. Pipe surface must be free of all traces of loose rust, scale, corrosion, thread compounds and raised metal that could interfere with sound transmission.
• Establish a flow of couplant through the scanning head and place on the tube 36 from the elevator shoulder. Mark the tube at the starting position and scan toward the upset. Rotate the tube ½ the width of the scanning head after each pass. Repeat for 100% of circumference. Pay special attention to the area within 8 of either side of the internal upset. Scan only from tube towards tool joint. Gain settings may be run higher than calibration settings to aid in signal acquisition but must be returned to calibration settings to determine if prove up is necessary. Any indications greater than 20% of full screen height will be marked for prove up. Prove up may be both UT. Visual, and / or magnetic particle as necessary to determine indications type and severity. Indications, which are clearly cracks and internal pitting, will be rejected outright. Other indications will be accepted or rejected according to the requirements of API RP - 7G and these specifications.
SHOULDER REFACING EQUIPMENT
The shoulder reface is a grinder type of tool, which is centered by a caliber inside the pipe in order to remove, nicks, gouges, pits and other imperfections from the seals of the connections. The amount of material removed is carefully controlled by the use of a vernier in order to meet with the specifications.
With corresponding caliber the shoulder Reface can be used on drill pipe, drill collars and Kelly's.
* SHOULDER REFACER
THREAD REPAIR BRUSHS.
PIPE STRAIGHTENER
For the straightening operation the pipe is rolled over the pipe ramps onto the inlet rack rollers. The pipe section to be straightened is placed underneath the hydraulic ram. Two pairs of rollers, which permit a circumferential pipe movement, are raised hydraulically to allow pipe can be spun and checked for straightness. This procedure is repeated until the straightness of the pipe is considered as being satisfactory.
Crooked and bent drill and tubing are straightened with the mobile hydraulic pipe straightened from TUBOSCOPE VETCO INTERNATIONAL.
The trailer -mounted unit can be set-up anywhere. The pipe is placed underneath the hydraulic ram and rotated on hydraulically lifted free rollers on each end in order to determine the bent areas. Rollers sliding on the frame are positioned at the beginning and the end of the bent area and the hydraulic ram is carefully operated until the bend is removed.
With this method it is possible to re-condition pipe which normally would be useless.
Weight of the trailer -mounted straightened : Approx. 1Ton
Diameter range : Up to 5 drill pipe
Ram force : Approx. 60 tons
Current required for electric motor : 380V
It is recommended to perform an inspection on the pipe after the straightening to ensure that wall thickness reductions due to the double stressing are not beyond the limits.
STRAIGHTENER ACCSSORIES
• 4 frame supports for the stabilizing jacks.
• 4 jacks to level -out and stabilize the unit.
• 4 pipe ramps over which pipe are loaded resp. unloaded into/from unit.
• 2 sectioned pipe support frames of 4000 mm length each, which are to be attached to either end of unit
• 2 adjustable height frame supports.
• 2 adjustable height pipe supports with roller.
• 2 longitudinal movement steel rollers acting as pressure points. They can be bolted into different positions in order to increase or decrease the active length of pipe section to be straightened
• 4 hydraulically activated transverse rollers pairs used o check the pipe straightness
• Hydraulic hoses .
TOWABLE FOR ROAD TRANSPORT
Dimensions:
Length : 3.600mm above tow bar
Width : 1.590 mm above wheels
Height : 1.800mm
Weight : Approx. 1.5 metric ton
TECHNICAL DATA
Hydraulic Ram : 200mm diameter
Hydraulic Press : Maximum 250bar
Ram Force : 60metric tons
Engine : Air-cooled HATZ E 85 Diesel
4 KW ( 5,4 HP ) , manually started
CAPABILITY
Drill Pipe : Up to 5
Drill Collar : Up to 3 ½
The two - Wheel three - point hydraulic unit is equipped with running brake and road regulation lighting. It can be towed with the regular permissible trailer speed, it is TUV approved and accepted for maximum 80km/h.
Straightening.
Straightening service are performed on tubes wich has been bent or bowed, either in service or through handling. Pipe is straightened using either stationary or mobile equipment, depending on location.
