Maximum material condition

Maximum material condition - where most material remains on the workpiece, i.e. upper limit of a shaft or lower limit of a hole. 

Limit gauges are arranged so that the GO portion of the gauge checks the maximum material condition (Le. the upper limit of the shaft or lower limit of the hole) while the NOT GO portion of the gauge checks the minimum material condition (i.e. the lower limit of the shaft or upper limit of the hole). 

The versatility and economic benefits of true position tolerances are particularly enhanced when they are assigned at the Maximum Material Condition (MMC). At MMC, an increase in position tolerance is allowed, equal to the departure of the feature from the maximum material condition size, (ISO, 1988 ASMS, 2009). As a consequence, a feature with size beyond maximum material but within the dimensional tolerance zone and its axis lying inside the enlarged MMC cylinder is acceptable. The accuracy required by a position tolerance is thus relaxed through the MMC assignment and the reject rate reduced. Moreover, according to the current ISO and ASMS standards, datum features of size that are included in the DRF of position tolerances can also apply on either MMC, Regardless of Feature Size (RFS) or Least Material Condition (LMC) basis. 

Diplaris, S. Sfantsikopoulos, M.M. (2006). Maximum material condition in process planning. Production Planning Control, Vol. 17, No. 3, p>p. 293-300, ISSN 0953-7287... 

Trial 1 Estimate area. A, for maximum flux condition, limiting Q/A to 12,000 Btu/hr-fT surface for organic materials. Experience has shown that a value of 6,000-8,000 is a good starting value for Q/A for organics. 

Material selection should be compatible with all states of the C02 stream. They should be defined to prevent corrosion and maximum material stress. In addition, eligible materials need to be qualified for the potential low temperature conditions that may occur during a pipeline depressurisation situation. 

Figure 3.36 shows the heating principle of the zone refining purification procedure and also introduces the geometric and material conditions that characterize the process. It also shows how the stick transfers heat to the contiguous medium. For a correct introduction to this problem, we assume that the production of heat by the inductor has Gaussian behaviour, so, for the heat generation rate, we can write Eq. (3.124) where the source amplitude (watt/m ) is A, f(t) is a dimensionless function that keeps the maximum temperature for the inductor constant and kj and k2 are the constants with dimension ... 

Relationships between three extraction parameters—solvent composition, temperature, and particle size—can be determined from simple beaker tests. Raw material ground to the desired particle size is contacted with the chosen solvent at the chosen temperature in a beaker and mixed over time. Thief samples are removed at various time intervals and analyzed for the marker. At the completion of the test, the marc is separated from the extract, dried, and analyzed. (In instances when the phytochemical is heat sensitive, the marc can be analyzed wet and the assay calculated on a dry basis). Based on this information, the amount of marker remaining in the dry marc can be determined after correcting for the marker in the absorbed extract in the wet marc. From these data, the equilibrium relationship defined in Equation 11.1 can be determined, as well as the time it takes to reach maximum extraction. Conditions are changed to give a high equilibrium constant and a short extraction time to reach equilibrium. Based on this information, one can select the appropriate extraction equipment as well as the operating conditions to operate the equipment. 

The tubes containing the reformer catalyst are one of the most important elements of the reformer. They represent up to 30 7o of the total reformer cost and the maximum operating conditions for the process are established by the tube material [2]. The tubes are normally 108 mm outer diameter (O.D.) X 72 mm inner diameter (l.D.) (4,25 in. O.D. x 2.83 in. I.D.). Materials of construction are high nickel alloy such as HK 40 (25 Cr/20 Ni), Inconel 617, Inconel 800 and Supertherm [1]. Low pressure reformers use primarily HK 40 tube material. However, high pressure units require more expensive alloys like 25 Cr/35 Ni,Nb, known as HP with Nb, to withstand more severe pressure and temperatures [2]. 

The optimum moderation condition for uranium oxide pellets in water was determined for three different lump density systems. Optimum moderation for this study was defined as that combination of pellet diameter (POD) and water-to-fuel ratio (W/F) resulting in the maximum material buckling (Bm ), and hence the minimum critical dimensions. This point does not result in optimum reactivity, which is defined as the condition producing the greatest infinite multiplication (k, ). The data to determine these optimum moderation conditions were generated using the computer codes GAMTEC (Ref. 1) and THERMOS (Ref. 2). The results of these determinations are shown in Table I. 

The purpose of the examination is to ascertain the material condition of the boiler with particular reference to any defects which could affect the continued safe working of the boiler at its current maximum permissible working pressure. During the examination when cold the competent person will be checking for the following types of typical defects ... 

X. Assignment of Maximum Material and Least Material Conditions to both the RE-feature and RE datum features. 

Sets of Suggested DFRs that are produced in step (b), Dsg, are qualified as subgroups of the sets of Candidate DFRs, Dcan K in accordance with their conformance with the measured location coordinates and the application or not of the Maximum or Least Material Conditions to the RE-feature size or to the RE-Datum size. In conjunction with equation (16), qualification criterion for the Suggested DFR s, DRF( )j j=l,2,..., n, is. Figure 4(a),... 

In case constraint (25) is not satisfied, a DRFtOj can only be further considered, when Maximum or Least Material Conditions are applied to RE-feature size. Figure 4(b),... 

Candidate Theoretical Dimensions that satisfy the constraints (28) but not the constraint (29) can apparently be further considered in conjunction with constraint (27) when Maximum or Least Material Conditions are used. In these cases they are respectively qualified by the conditions, e.g. for the case of RE-feature /Hole, Figure 5(b),... 

The pressure factor for horizontal and vertical process (pressurized) vessels of diameter D meters and operating at a pressure of P barg is based on the ASME code for pressure vessel design [5]. At base material conditions using a maximum allowable stress for carbon steel, S, of 944 bar, a weld efficiency, E, of 0.9, a minimum allowable vessel thickness of 0.0063 m (1/4 inch), and a corrosion allowance, CA, of 0.00315 m (1/8 inch) gives the following expression ... 

Material condition Hoop stress at failure Ib/ln2xl0 3 Circumferential strain at burst % Maximum reduction of wall thickness % Ratio burst stress/ UTS (T)... 

DIN V 54900-3 describes the test under practical rather than laboratory conditions. It determines the maximum material thickness that can be degraded within a realistic degradation time. One possible measure is the amount of material that can be retrieved after a certain time (sieving)... 

After the basic preliminary work is concluded on further development of the proposed concept, the testing time requirements per material (or material condition in the pipe) are estimated at a few weeks (up to a maximum of a few months) which appears reasonable in comparison with other long-term experiments (including accelerated tests). It must be noted, however, that this does not render obsolete the current requirements for qualification according to EN ISO 9080. 

Optimal conditions conespond to a magnetic excitation value such as permeability of the material is maximum. 

In Figure 5.24 the predicted direct stress distributions for a glass-filled epoxy resin under unconstrained conditions for both pha.ses are shown. The material parameters used in this calculation are elasticity modulus and Poisson s ratio of (3.01 GPa, 0.35) for the epoxy matrix and (76.0 GPa, 0.21) for glass spheres, respectively. According to this result the position of maximum stress concentration is almost directly above the pole of the spherical particle. Therefore for a... 

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