Sleeve nuts

Considerable inconvenience is sometimes encountered when setting the tower in place because it is difficult to lower the heavy vessel over the foundation bolts without bending them or damaging the threads. Figure 11-2 illustrates this difficulty. A sleeve nut is welded to the top of the bolt. It is placed so that the top of the nut lies slightly below the surface of the concrete, with a sheet metal sleeve around it. The tower may then be placed in position without interference from the bolts. Stud bolts are next inserted through the lugs on the tower, and screwed into sleeve nuts from the top. 

Designers faced with this dilemma in die past have come up with special nuts for high pressure applications. They are called sleeve nuts. 

Sleeve nuts can be made much smaller in diameter than nuts for the same diameter. In addition the spacing between studs will not be based on wrench clearances, but on whatever tightening device is utilized. 

Sleeve Nuts. Sleeve type nuts are utilized whenever normal spacing of nuts based on wrench clearances cannot be met or is not desirable. 

Sleeve nuts are a smooth sleeve of metal that is internally threaded. The nuts may have a nut machined to the... 

In this case, the nut is not there to create the stud tension, but only used to secure the elongation of the stud. Sleeve nuts achieve this goal with a minimum of metal. Sleeved nuts may have holes drilled in them to facilitate the turning of the nut during stud elongation. 

Sleeve nuts have longer threads to develop full strength as opposed to nuts. Sleeve nuts should have a minimum of 10 threads to ensure full strength. 

Fig. 10-4 Insulating Joint with explosion-proof spark gap (I/sohz = 1 1/50//s = 2.2 kV surge current =100 kA). 1, insulating flange 2, hexagonal nut 3, insulator ring 4, insulator sleeve 5, insulator disc 6, steel disc 7, blue asbestos gasket 8, explosion-proof spark gap.

The hydraulieally tensioned, radial-fit bolt (Figure 6-32) replaees the traditional turbine shaft eoupling bolt and is reusable. The main body of the bolt is threaded at eaeh end and has a slight taper on the eenter seetion, whieh engages with the similarly internally tapered sleeve and the two nuts. The bolt is taper-bored at eaeh end to aeeept the puller that is part of the hydraulie tensioning system. 

To install the bolt body, it is inserted in the hole through the two flanges with the sleeve in the elearanee position. Hydraulie pressure pushes the sleeve into the final (interferenee) fitted position, and the puller draws the bolt baek into the sleeve. The nut is fitted at one end and the bolt is hydraulieally tensioned with the other nut. The entire proeess takes about 15 min per bolt. 

The eentral body of the bolt has eireumferential grooves, whieh allow lubrieant to flow between the bolt and sleeve. It ean be removed by first removing the nuts and then fitting an oil injeetor into the... 

A Shaft Bearing—Thrust 105A Sleeve Lock Nut... 

The fittings are made of steel, aluminum alloy, or bronze. The fitting used in a connection should be made of the same material as that of the sleeve, the nut and the tubing. For example, use steel connectors with steel tubing and aluminum alloy connectors with aluminum alloy tubing. Fittings are made in union, 45° and 90° elbows, tee, and various other shapes. Figure 40.37. 

Tubing used with flare connectors must be flared prior to assembly. The nut fits over the sleeve and, when tightened, it draws the sleeve and tubing flare tightly against the male fitting to form a positive seal. 

Minor parts that are not identified (sueh as nuts, springs, washers, gaskets, and keys) shall have eorrosion resistance at least equal to that of speeified parts in the same environment. Gasket or seal material between the shaft and the shaft sleeve under the paeking or meehanieal seal shall be verified by the vendor as being satisfaetory for the serviee conditions. 

Figure 5.1-4. Arrangement of thermocouples and peroxide injection, a. High pressure lube b, flange c, lens-ring d, boll e, thermocouple f, gland nut and sleeve.

Slip the spacing sleeves over the feet and screw down the anchor screws tightly. Place the templet on the feet and fasten it with the cap nuts. 

Remove collar H14 and unscrew nut H7. Lift off distributing ring H4 and paring disc. Pull sleeve H2 out of the cover. Check packings H3 and H5. 

Drive the ball bearings on the shaft with the driving-on sleeve. - Secure the round nut with the lock washer. - Clean the friction surface of the conveyor pulley. 

MM1 74370 1 Valve housing (with connection sleeve and coupling nut)... 

KK15 71028 1 Elbow (with connexion sleeves and coupling nuts)... 

The available configurations for these fittings are basically T, cross, straight with options for either all tube ends, or tube to NPT. The tube connecting ends consist of a nut with two sleeves (ferrules) that slip over the tubing. The sleeves are compressed and locked into the tubing by tightening the nut to create a sealed connection. For this type, do not use any thread compound or tape on the tube end connection threaded nut. You can use tape on the NPT side, however. 

---