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The development of the gauge follows the introduction of the Thermit® head repair (HRW) process.
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|Thumbnail||Network Rail Reference||Description|
|Network Rail Reference: 0046/035046||Description: Rail head depth gauge|
|Network Rail Reference: 0046/035047||
Rail head depth gauge calibration block supplied with UKAS certificate of calibration.
Validity is for 5 years.
The use of the gauge enables the depth of material remaining in the head section to be established. The measurement is then compared to the depth of the defect previously measured ultrasonically. This enables the engineer to establish if there is sufficient material remaining in the head of the rail to allow for the use of the HRW process.
The standard requires that a minimum of 10mm of material remains in the head of the rail after the defect is initially excavated by means of flame cutting, with a further allowance to grind down to 8mm. The gauge has therefore been designed with the zero datum on the engraved scale offset by 8mm to incorporate the minimum depth requirement. This negates the need for engineers to allow for this when assessing the suitability of the use of the HRW process.
Using the Gauge:
The gauge is simply held against the rail. Four contact points (web, underside of head, side of the head profile and underside of contact arm) ensure that the gauge is aligned correctly. The contact arm is lowered down so that it rests on the top face of the head of the rail and the arm is locked in position by means of a locking screw. The gauge is removed from the rail and the reading is then noted.
Range 0 – 35mm
Sub Divisions every 5mm
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