GAS PURGE PLUG, CONTAINING WEAVE INDICATORS Russian patent published in 2017 - IPC B22D1/00 

FIELD: metallurgy.

SUBSTANCE: purge plug (1) for the gas comprises a refractory material housing (2) with an inlet (3a) for gas at the inlet end (2a), a gas outlet (3b) at the outlet end (2b), a final visual indicator (5) wear and an intermediate visual wear indicator (4). The indicator (5) is in the form of an elongated core and is located from the first inlet end (2a) to a distance h1 along the central longitudinal axis X1. The indicator (4) is partially inserted in the indicator (5) and is located at a distance h0 from the inlet end (2a) to the final distance h2. The length H of the body (2) and the length of the indicators (4, 5) are related by the relation h0<h1<h2<H. The housing (2), the indicator (5) and the indicator (4) are made of different first, second and third refractory materials, whose appearance at a temperature of 800-1500°C visually differs.

EFFECT: obtaining information on at least four levels of erosion of the purge plug.

11 cl, 4 dwg