FIELD: oil and gas industry.
SUBSTANCE: device consists of tubular casing with threaded ends and punched holes and metal casing in the form of shell with punched holes made as slots of squamous shape. The housing is made with protruding under beginning and end of each slot. The upper part of protrusion in each squamous slot has a shelf.
EFFECT: increase of performance rating, improvement of safety.
5 dwg
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