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
申请公布号
RU2486332(C1)
申请公布日期
2013.06.27
申请号
RU20120136879
申请日期
2012.08.29
申请人
OTKRYTOE AKTSIONERNOE OBSHCHESTVO "TATNEFT'" IM. V.D. SHASHINA
