Specifications ASME

Recent studies showed that ASM specifically associates with phosphatidyhnositol-3-kinase (PI-3-K) upon NGF stimulation of PC 12 cells via TrkA (Bilderback et al, 2001). Association between the two molecules was mediated by the regulatory p85 subunit of PI-3-K and was restricted to membrane rafts. Activation of PI-3-K by NGF triggering resulted in an approximately 50% reduction of ASM activity pointing to a negative regulation of ASM by this mechanism. 

Figure 5.20 shows the orifice (discharge) coefficient as a function of the orifice Reynolds number ( Rerf) and p = d D. There are a variety of standard orifice plate and pressure tap designs (e.g., Miller, 1983). The ASME specifications for the most common concentric square-edged orifices are shown in Figure 5.21. The various pressure tap locations are illustrated in Figure 5.22. Radius taps, for which the location is scaled to the pipe diameter, are the most reliable. Comer taps and flange taps are the most convenient, as they can be installed in the orifice flange and so do not require...

The vast majority of vessels are constructed of ferrous and nonferrous alloys. Ferrous alloys are defined as those having more than 50% iron. They are used in the ASME Code, VIII-1 and 2, and include carbon and low-alloy steels, stainless steels, cast iron, wrought iron, and quenched and tempered steels. Nonferrous alloys include aluminum, copper, nickel, titanium, and zirconium. The ASTM designates all ferrous alloys by the letter A and all nonferrous alloys by B. ASME uses the prefixes SA and SB, respectively, In most cases the ASME and ASTM specifications are identical. However, vessels built to the ASME Code usually refer to the ASME specifications. 

All aluminum alloys are categorized by ASME specification number, alloy... 

A 102 inch OD F D (flanged and dished, or torispherical) head made to ASME specifications (KR > 0.60/ and KR > Sijj, where = head thickness) is spun from a 1-inch plate. The head is in the horizontal position. The liquid level is 35 inches inside the head. Determine the volume of the liquid that occupies the partial volume of the head. 

A 138 inch OD F D head not made to ASMS specifications is spun from a 1 i/2-inch plate. The liquid level is 18 inches. Find the volume of the liquid. 

Most recovery boilers use 63,5 mm OD carbon steel tubes in the generating bank. With a few exceptions these tubes are swaged at the ends to 50,8 mm. When the 63,5 mm raw tube is manufactured it is subject to a lot of specifications i.e. ASME. There are no specifications for the swaged end of the tube. This is unfortunate as the swaged part of the tube is subjected to further mechanical deformation dtuing the rolling procedure and is located in a wastage zone of tire recovery boiler. 

AWS) has issued specifications covering the various filler-metal systems and processes (2), eg, AWS A5.28 which appHes to low alloy steel filler metals for gas-shielded arc welding. A typical specification covers classification of relevant filler metals, chemical composition, mechanical properties, testing procedures, and matters related to manufacture, eg, packaging, identification, and dimensional tolerances. New specifications are issued occasionally, in addition to ca 30 estabUshed specifications. Filler-metal specifications are also issued by the ASME and the Department of Defense (DOD). These specifications are usually similar to the AWS specification, but should be specifically consulted where they apply. 

When the explosion-bonding process distorts the composite so that its flatness does not meet standard flatness specifications, it is reflattened on a press or roUer leveler (ASME SA20). However, press-flattened plates sometimes contain localized irregularities which do not exceed the specified limits but which, generally, do not occur in roU-flattened products. 

Pressure- Vessel Standards. Explosion-clad plates for pressure vessels are tested according to the appHcable ASME Boiler and Pressure Vessel Code Specifications. Unfired pressure vessels using clads are covered by ASTM A263, A264, and A265 these include tensile, bend, and shear tests (see Tanks AND pressure vessels). 

Many other codes, standards, specifications, and recommended practices have been developed by various organizations (26). Some apply to specialized piping systems others, particularly those covering materials and dimensions, are referenced in the ANSI/ASME Code for Pressure Piping. 

Specification for Hori2ontal End Suction Centrifugal Pumps for Chemical Process," ASME B73.1M, Washington, D.C., 1991. 

For extended surfaces, which include fins mounted perpendicularly to the tubes or spiral-wound fins, pin fins, plate fins, and so on, friction data for the specific surface involved should be used. For details, see Kays and London (Compact Heat Exchangers, 2d ed., McGraw-HiU, New York, 1964). If specific data are unavailable, the correlation by Gunter and Shaw (Trans. ASME, 67, 643-660 [1945]) may be used as an approximation. 

Personnel performing examinations other than visual shall be qualified in accordance with applicable portions of SNT TC-IA, Recommended Practice for Nondestructive Testing Personnel Qualification and Ceitification. Procedures shall be qualified as required in Par. T-150, Art. 1, Sec. Vof the ASME Code. Limitations on imperfections shall be in accordance with the engineering design but shall at least meet the requirements of the code (see Tables 10-58 and 10-59) for the specific type of examination. Repairs shall be made as applicable. 

Truck cargo tanks (for dangerous materials) are built under Part 173 and Siibpart J of Part 178, DOT regulations. This includes Specifications MC-306, MC-307, MC-312, and MC-331. MC-331 is required for compressed gas. Siibpart J requires tanks for pressures aoove 345 kPa (50 Ibf/in ) in one case and 103 kPa (15 Ibf/in ) in another to be built according to the ASME Pressure Vessel Code. A particular issue of the code is specified. 

Because of the demands of highway service, the DOT specifications have a number of requirements in addition to the ASME Code. These include design for impact forces and rollover protection for fittings. 

Shell and Tube Heat Exchangers for General Piefineiy Seivices, API Standard 660, 4th ed., 1982, is published by the American Petroleum Institute to supplement both the TEMA Standards and the ASME Code. Many companies in the chemical and petroleum processing fields have their own standards to supplement these various requirements. The Jnterrelation.ships between Codes, Standards, and Customer Specifications for Proce.ss Heat Tran.sfer Equipment is a symposium volume which was edited by F. L. Rubin and pubhshed by ASME in December 1979. (See discussion of pressure-vessel codes in Sec. 6.)... 

Safety Relief Valves Conventional safety relier valves (Fig. 26-14) are used in systems where built-up backpressures typically do not exceed 10 percent of the set pressure. The spring setting or the valve is reduced by the amount of superimposed backpressure expecied. Higher built-up backpressures can result in a complete loss of continuous valve capacity. The designer must examine the effects of other relieving devices connected to a common header on the performance of each valve. Some mechanical considerations of conventional relief valves are presented in the ASME code however, the manufacturer should be consulted for specific details. 

---