Usfd manual

Ultrasonic testing of rails was introduced over Indian Railways during early 60s. From a humble beginning, usfd manual, this technique has graduated itself to an extent that today it is one of the most powerful tools of usfd manual maintenance of the permanent way.

Disclaimer: This Compilation is for educational reference only. For details refer original correction slips. Ultrasonic testing of rails was introduced over Indian Railways during early 60s. From a humble beginning, this technique has graduated itself to an extent that today it is one of the most powerful tools of preventive maintenance of the permanent way. During the last 40 years of its existence, a large number of testing procedures, specifications, guidelines and criteria have been issued from time to time based on the experience gained. The advent of fracture mechanics concept coupled with state of the art steel making technology has thrown open a new dimension in the periodicity of ultrasonic examination. The rate of crack propagation and fracture toughness characteristics of rails can be experimentally found which determine the critical crack size.

Usfd manual

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Adjust the gap of the angle probes as in iii above. The advent of fracture mechanics concept coupled with state usfd manual the art steel making technology has thrown open a new dimension in the periodicity of ultrasonic examination of rails. Reference is also to be made to Rly, usfd manual.

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Ultrasonic testing of rails was introduced over Indian Railways during early 60s. From a humble beginning, this technique has graduated itself to an extent that today it is one of the most powerful tools of preventive maintenance of the permanent way. During the last 40 years of its existence, a large number of testing procedures, specifications, guidelines and criteria have been issued from time to time based on the experience gained. The advent of fracture mechanics concept coupled with state of the art steel making technology has thrown open a new dimension in the periodicity of ultrasonic examination. The rate of crack propagation and fracture toughness characteristics of rails can be experimentally found which determine the critical crack size. Based on the above knowledge and experience, it was considered necessary to assimilate the entire information on ultrasonic examination of rails and present in the form of a manual so as to guide the ultrasonic personnel in testing, interpretation and decision-making. Subsequently, a revision was issued in in view of the experience gained in the field of USFD testing and maintenance practices. This revised edition is therefore prepared incorporating all the amendments and revisions. The provisions made are mandatory for all ultrasonic personnel and supersede all previous instructions in case they happen to be contradictory to the instructions contained in this manual.

Usfd manual

Disclaimer: This Compilation is for educational reference only. For details refer original correction slips. Ultrasonic testing of rails was introduced over Indian Railways during early 60s. From a humble beginning, this technique has graduated itself to an extent that today it is one of the most powerful tools of preventive maintenance of the permanent way.

Industrial synonym

Vertical longitudinal crack in foot: Such cracks develop from sharp chamfers on the bottom surface of the rail foot. This set-up incorporates three 70 o probes covering approx. The presence of holes result in unfavorable stress distribution caused due to non-uniform cooling. So classification classification is done. An equipment which can shortlist likely defective spots quickly can improve the effectiveness of the testing. Spare batteries shall be arranged as and when expecting back up time of battery becomes low. Procedure for ultrasonic testing of Alumino-thermic welded joints 24 9. Standard hole at rail head 25mm from rail top. For 60 Kg. Probes used are of the following types: Probes 0o Normal 70o Central forward and backward 70o side wise Defect type Horizontal flaws Vertical transverse flaw Vertical transverse flaw 35o forward and backward Star cracks The SEJ should be adequately protected till it is replaced. Details of frequency and number of each type of probes are as under:. Apply the Couplant and place the probe at a distance of mm from edge of the weld near to upper zone of the flange with beam direction towards simulated flaw Fig. Thermit 2. Ultrasonic equipment is to be inspected daily before start of work as per para 5.

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Electric arc joint 4. Details of frequency and number of each type of probes are as under: Type Frequency No. Now with 25 years of experience behind us in the area of USFD testing of rails and also the findings of studies in crack propagation mechanism conducted at RDSO, a more rational condemning defects size has now been specified. All these probes are 0o Normal probes of frequency varying between 2. The procurement of spares for a machine shall be done from Original Equipment Manufacturer OEMs of that machine only, in order to ensure compatibility of spares with the machine and to achieve consistent and assured quality of testing. Check with the help of a feeler gauge. Any variation in the signal amplitude shall be compensated by giving measured extra gain dB as per step c above to carry out ultrasonic testing. Horizontal cracks: These cracks develop in the web and propagate both in head and foot. Tandem Scanning 2 Nos. Date of checking of characteristics Uploaded by Radha Krishnan.