Ferrule inserts

The great difficulty with such fire-side, multitube boilers is overheating the hot-side tubesheet. This tubesheet is exposed to the full temperature of the combustion gases, but is difficult to keep cool with the boiler s feedwater. Also, the ends of the tubes, where they are sealed in the tubesheet, are hard to keep cool. To protect these ends from the direct radiant heat in the combustion chamber, ferrule inserts, about lV2 in long, are cemented into the front end of each tube. 

Erosion in waste-heat boilers is limited primarily to the inlet ends of the tubes and is combatted by the use of steel ferrules inserted into the... 

For inlet or outlet end erosion-corrosion, either extend tube ends 3 or 4 inches into the water box or install sleeves, inserts, or ferrules into the tube ends. These should be a minimum of 5 inches long. The ferrules may be nonmetallic or erosion-resistant metals, such as stainless steel, if galvanically compatible. The end of the ferrule should be feathered to prevent turbulence. 

Turbulence created at the inlet end resulted in erosion-corrosion. Problems of this type can be remedied by using appropriate inserts or ferrules. 

Tubes may be inserted into a tubesheet, and packing may be added between them and the tubesheet. A threaded ferrule is inserted to tighten the packing. This type of joint is used only for special expansion problems. 

The fiber FPI sensor illustrated in Fig. 7.3 can be fabricated by inserting two endface-cleaved optical fibers into a ferrule. The ferrule usually has a diameter... 

Put the ferrules on the Teflon (see top of photo, above), insert into the tubing end of fitting and tighten lock nut slightly (see page 80). 

Place the taped rod with the Teflon insert into the fitting, put on the ferrules and nut, and then tighten. 

A From the outside of the flange, put on the fitting tube nut, and twist it moderately tight so that the ferrules grip the Teflon insert. 

To increase the sensitivity of measurement of many substances (e.g. morphine, oxazepam, amphetamine), it is strongly recommended that the silanized glass insert and the silanized glass wool which it contains should be changed every week. Inserts and ferrules can be used many times, but prices used in the calculation are of new items, labor costs of cleaning and silanizing used inserts for reuse being accounted for as expediency costs. 

A hole is drilled in the masonry to take the iron shell and ferrule. The iron shell is inserted with the spring wire clip end first so that the ferrule is at the outer surface. The bolt is passed through the fixture, located in the expanding nut and tightened until the fixing becomes secure. 

Insert shell and ferrule In hole and attach fixture with bolt... 

Fiber optic connectors are devices that are installed (terminated) upon fiber ends to allow for the interconnection and remating of optical fibers. The ferrule of each connector houses the fiber and is the specific part of the connector ahgned in a connector pair. When two connectors are mated, the fiber endfaces are mechanically aligned and held in physical contact to achieve the requisite insertion loss and reflectance performance. The connector also allows the fiber to be easily mated into the input and output ports of transceivers. 

The alignment of the fibers in a connector pair is dependent upon the geometry of the optical fiber, the connector ferrules, and the sleeve in the adapter used to align the two connector ferrules. To aid in fiber alignment, some connector ferrules are tuned so as to align any offsets in the optical fiber position in the same direction with every connector, typically to the 0 or 180° relative position. This minimizes the light loss between two randomly mated connectors. The loss of optical power across a connector pair is called insertion loss and it is the most common parameter measured in evaluating the expected system performance. 

The connections of the capillary to the detector, injector and the insert are additional and frequent trouble spots. Injeetion of 2 mL of dichloromethane into the closed oven is a useful overall leak test. A rapid response of the detector (10-20 s) indicates a leak near the detector, a signal delayed by the residence time in the column (eg., 60s for a 30m column length) indicates a leak near the injector. The more specific signal test is then applied as discussed above. Ferrules for the capillary are frequent sources of problems with some equipment. Graphite or vespel ferrules must have a 0.5 mm bore for a 0.32 mm i.d. column. 

Always cut the ends of a capillary column after insertion through graphite ferrules. 

Vu-Union. The primary and secondary sealing mechanisms in a capillary Vu-Union is shown in Figure 3.57, where the two column ends are positioned into ferrules located inside a deactivated tapered glass insert. This type of connector combines the benefits of a low-dead-volume connection with the sturdiness of a ferrule seal. Furthermore, the glass window permits visual confirmation of the connection. 

The precipitated polyethylene from the above extraction is pushed aside with a microspatula. The porous metal filter portion of the filter apparatus is inserted into the solution and about 5-10 ml of solution is drawn into the syringe. The Teflon tube is removed from the ferrule on the needle and the filtered solution is dispensed into a small... 

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