Importance

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Abstract

A remotely installable piping support attachment employs a T-bolt type of blind fastener for clamping a relatively smaller instrumentation pipe, e.g., the jet pump sensing line, to the wall of an adjacent structure, e.g., the inlet mixer diffuser. The attachment assembly includes a T-bolt, a split pipe clamp support, a ratchet nut with peripheral ratchet teeth, and a ratchet lock washer. The head of the T-bolt is inserted through an elongated hole machined in the diffuser wall and then rotated so that the T-bolt head cannot pass back through the elongated hole. When the nut is tightened on the threaded shank of the T-bolt, a top plate and an anchor of the split pipe clamp support are pressed together to clamp the jet pump sensing line therebetween. The ratchet lock washer is counterbored for receiving the nut and slotted to provide an integral spring arm encircling the nut. A short length of the inside of the spring arm end has a ratchet tooth contour which engages the ratchet tooth contour on the periphery of the nut. The ratchet lock washer also has a key which engages a groove in the top plate, thereby preventing rotation of the lock washer relative to the top plate. The meshing of ratchet teeth in turn blocks rotation of the nut in the direction of loosening.

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First Claim