Extra-length tensioning studs, nuts drilled for a tommy bar, heavy hex nuts and hardened washers, made in Houston to your drawings and specifications.
A 24-inch (NPS 24) Class 900 ring-joint flange on a vertical pipe spool, with a hydraulic tensioner on every other stud (50 % cover). A tensioner does not turn the nut to load the stud: its puller screws onto the thread standing above the nut, the load cell stretches the stud directly, and the nut is run down by hand through the bridge window. That is why these studs are longer than the flange standard's, by at least one stud diameter on the tool side. The joint comes apart in order: hoses off, pullers unscrewed, tensioners lifted clear, nuts spun off, then the flanges part and leave the twenty studs and the ring gasket in the gap. The bolting we make is in colour; the tensioners, hoses and pump are the service crew's tools and stay as linework. Press Solid view for a steel model, or Cutaway to see one tensioner, its stud and nut, both flanges and the ring gasket in section.
Twenty 2-1/2 in.-8UN full-thread studs on a 35-1/2 in. bolt circle (ASME B16.5 Class 900, NPS 24). Made longer than the standard 18 in. ring-joint stud so that at least one stud diameter of thread stands beyond the nut for the tensioner's puller to grip; shown at 21-1/4 in.
The tool-side nuts, 3-7/8 in. across the flats (ASME B18.2.2 heavy hex), drilled so they can be run down by hand with a tommy bar through the bridge window while the stud is held stretched. Round nuts are used the same way.
The reaction nuts on the other side of the joint, two-and-a-half-inch heavy hex to ASME B18.2.2. They hold the stud while it is pulled and share the load once it is released.
One under each nut, shown to ASTM F436 at 4-1/2 in. outside diameter: a flat, hard seat for the nut on the flange. The tensioner's bridge stands on the flange around the washer.
Tensioning studs, nuts and washers to suit your tools, to your drawing. Send us your drawings and material spec.
Request a quote832-446-3442A generic NPS 24 Class 900 joint, not any maker's design, and no tool maker's tensioner. The flanges, ring groove, ring gasket, stud diameter and thread, nuts, washers and pipe diameter follow the standards named below. The 21-1/4 in. stud length is calculated for this joint with washers and one stud diameter of extra thread; the tommy-bar holes, the tensioners, hoses and pump, the pipe schedule and the use of washers are illustrative. Stud length, thread protrusion, nut style and your tightening procedure come from your tooling and your own ASME PCC-1 procedure. Your drawings govern. We manufacture to your drawings and specifications.
Drawn to ASME B16.5 (Class 900 flanges, ring-joint facing, stud size), ASME B16.20 (R78 ring gasket), ASME B18.2.2 (heavy hex nuts), ASTM F436 (hardened washers) and ASME B36.10M (pipe), with the stud protrusion for tensioning from ASME PCC-1 and published tensioner guidance.
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