Hangers

Figure 6 shows the histogram of localized AE events vs axial position for the same time period as in fig.5. The location of the AE source corresponds, within source location errors (< 10-15 cm), to one of the welds under surveillance. The weld was known by ultrasonic examination to be affected by internal discontinuities. However, the position of the source could also correspond to one of the hangers. The steps observed in EA event accumulation have taken place during steady load operation, which normally corresponds to very low background noise conditions. This type of event, however, has not been observed afterwards. 

No firm conclusion should be drawn from the above data, through the observed pattern deserves attention. The AE activity observed on the SH header can originate from the weld, but could be due to other causes, namely to the settlement of the hanger. Ultrasonic inspection of the weld at regular intervals checks whether any sizeable change in NDT response from the weld has taken place. 

Fig. 10. Cross section of an EMFC weighing cell. Item 1, pan 2, hanger 3, parallel guide 4, chassis 5, flexure 6, lever 7, flexible link 8, pivot point 9, position indicator 10, position sensor 11, permanent magnet 12, permanent magnet air gap 13, compensation cod. See text.

M-Onorail scales are constmcted by removing a section of monorail track and replacing it with a similar section that is mounted on a scale. Loads transported by crane or on roUer hangers can be weighed quickly and easily. Capacities range up to 5 t. 

Worldwide Technology Assessment of Nitroglycerin Manufacture, 4 Vols., (Proprietary Information) Mason and Hanger, Silas Mason, 1985. 

Fig. 8. Vibration isolators (a) single-spring mount with base plate (b) neoprene mount (c) spring and neoprene hanger and (d) neoprene waffle pad.

Fused State Baths. Sodium hydroxide and salt can be heated to a fused state in baths to allow the removal of finishes from ferrous metals. The most common use of this method is the removal of heavy concentrations of paint on conveyer parts and hangers used in production spray systems. 

Pipe Hangers Catalog PH-92R, GrinneU Corp., Exeter, N.H., 1992. 

Butyl-type polymers exhibit high damping, and the viscous part of the dynamic modulus is uniquely broad as a function of frequency or temperature. Molded mbber parts for damping and shock absorption find wide appHcation in automotive suspension bumpers, auto exhaust hangers, and body mounts. 

Pipe hangers, fittings, valves Guards and watchmen... 

Pipe, valves, fittings, nuts, bolts, gaskets, and hangers... 

TABLE 10-44 Typical Hanger-Spacing Ranges Recommended for Reinforced-Tfiermosetting-Resin Pipe... 

NOTE Consult pipe manufacturer for recommended hanger spacing for the specific RTR pipe being used. Tabulated values are based on a specific gravity of 1.25 for the contents of the pipe. To convert feet to meters, multiply by 0.3048. 

Pipe hangers are essentially frictionless but require taller pipe-support structures which cost more than structures on which pipe is laicT Devices that reduce friction between laid pipe snbjec t to thermal movement and its supports are used to accomplish the following ... 

Percentages higher than those indicated will result in excessive wear on hanger bearings and couplings. 

Capacityf Diam. of flights, in Diam. of pipe, inj Diam. of shafts, in Hanger centers, ft Max. size of lumps Speed, r/min Max. torque capacity, in-lh Feed section diam., in hp at motor Max. hp capacity at speed listed... 

Virtually all steel components contacting coolant were attacked. A check valve from a spray system and a hanger bracket were both severely pitted and corroded. The mill components were corroded after an upset that permitted hydrochloric acid to mix with the mill coolant. The pH was at or below 2 during the upset, which continued for at least several weeks. 

Finally there are large plate anodes up to 1 m square with cable connections as hangers. Such anodes serve to drain stray currents in ships in fitting out or repairs (see Section 15.6). 

The load carried comprises approximately half the mass of the conveyor unit (50 9 kg), and half the mass of the items being conveyed at any one time. The mass of the items being conveyed on half of each conveyor unit fluctuates from 0 to 72 kg, approximately following a Normal distribution. The material specified for the hanger is hot rolled Grade 43C structural steel, which has a minimum yield strength SjVin = 275 MPa for a thickness t < 16 mm (BS 4360, 1990). 

The general dimensional properties of the unequal angle section used for the hanger are shown in Figure 4.63. Note that a < b and t < a and that the leg radii are square for mathematical simplification of the problem. 

A typical cause of piping strain occurs when two flanges do not meet and pipefitters force them together. Pipe hangers that are poorly placed or tensioned can also cause significant piping stress problems. 

Above temperatures of 900°F, the austenitic stainless steel and other high alloy materials demonstrate inereas-ingly superior creep and stress-rupture properties over the chromium-molybdenum steels. For furnace hangers, tube supports, and other hardware exposed to firebox temperatures, cast alloys of 25 Cr-20 Ni and 25 Cr-12 Ni are frequently used. These materials are also generally needed because of their resistanee to oxidation and other high temperature corrodents. 

---