Repair method of flushing head or exhaust head of steel pipe hydraulic testing machine

Abstract

The invention discloses a method for repairing a water flusher or an exhaust head of a steel-pipe hydrostatic testing machine. The method includes firstly flaring a crisscrossed inner hole of the water flusher or the exhaust head by machining and milling the hole bottom; manufacturing two hollow cylinder heads with sealing grooves in the front ends. Sealing rings are arranged in the sealing grooves, the hollow cylinder heads are connected in a cross manner through threads, and end face sealing rings are arranged on the connecting end faces; the hollow cylinder heads are nested in the crisscrossed inner hole of the water flusher or the exhaust head and in transition fit, the sealing rings of the front ends of the hollow cylinder heads are in interference fit with the crisscrossed inner hole; the water flusher or the exhaust head, the hollow cylinder heads and the sealing rings are subjected to hydrostatic testing after assembled, and repair of the water flusher or the exhaust head is completed after the technical requirement of the hydrostatic testing machine is met. By the method, cracking of the inner hole of the water flusher or the exhaust head is repaired, effectiveness of the water flusher or the exhaust head is guaranteed, scrappage after cracking is avoided and production cost is saved.

Description

technical field [0001] The invention relates to a method for repairing a flush head or an exhaust head of a steel pipe hydraulic testing machine. Background technique [0002] The hydraulic testing machine is an inspection equipment used for comprehensive inspection of steel pipes, as well as a comprehensive inspection of the pipe body instead of magnetic flux leakage testing equipment. The core components of the hydraulic testing machine are the water filling head and the exhaust head, which need to withstand the test pressure of more than 120MPa during the pressure test of the steel pipe, such as figure 1 As shown, the body 3 of the water filling head and the exhaust head is provided with a cross inner hole 31, and after a certain period of use, the cross inner hole cracks due to high pressure. Once the inner hole of the cross is cracked, because it needs to withstand high pressure during on-site use, and the special material cannot be repaired by surfacing, the water fil...

AI Technical Summary

Problems solved by technology

Once the inner hole of the cross is cracked, due to the need to withstand high pressure during on-site use, and the special material cannot be repaired by surfacing, the water filling head and exhaust head are scrapped.

The cost of spare parts of nearly 1 million per piece will be lost, and at the same time, the production of steel pipes on site will also be seriously hindered.

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