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1,1,1,2-Tetrachloroethane can be obtained by a two-step addition reaction of acetylene with chlorine (via dichloroethene), but this mainly produces 1,1,2,2-tetrachloroethane. C 2 H 2 + Cl 2 → C 2 H 2 Cl 2 C 2 H 2 Cl 2 + Cl 2 → C 2 H 2 Cl 4. It can be obtained directly by chlorination of 1,1,2-trichloroethane: [3] CHCl 2 −CH 2 Cl + Cl 2 ...
The current convention is a combination of 1973 Convention and the 1978 Protocol, [3] which entered into force on 2 October 1983. As of January 2018, 156 states are parties to the convention, being flag states of 99.42% of the world's shipping tonnage. [1]
In the recent past, HSS was commonly available in mild steel, such as A500 grade B. Today, HSS is commonly available in mild steel, A500 grade C. Other steel grades available for HSS are A847 (weathering steel), A1065 (large sections up to 50 inch sq made with SAW process), and recently approved A1085 (higher strength, tighter tolerances than ...
One gaul is defined as the resistance of an airway which, when air (of density 1.2 kg/m 3) flows along it at a rate of one cubic metre per second, causes a pressure drop of one pascal. The gaul has units of N·s 2 /m 8, or alternatively Pa·s 2 /m 6. It uses the same basic equation as its Imperial counterpart, but with slightly different ...
The towers had a core for services, seen in the center. The design was not tube-in-tube since the core had 47 columns spaced relatively evenly, rather than around the edge of the core. This is the simplest incarnation of the tube. It can appear in a variety of floor plan shapes, including square, rectangular, circular, and freeform.
EN 1993-1-2 deals with the design of steel structures for the accidental situation of fire exposure and it has to be used in conjunction with EN 1993-1-1 and EN 1991-1-2. This part only identifies differences from, or supplements to, normal temperature design. EN 1993-1-2 deals only with passive methods of fire protection.
For ozone (O 3), the guidelines suggest values no higher than 100 μg/m 3 for an 8-hour mean and 60 μg/m 3 peak season mean. [2] For nitrogen dioxide (NO 2), the guidelines set 10 μg/m 3 for the annual mean or 25 μg/m 3 for a 24-hours mean. [2] For sulfur dioxide (SO 2), the guidelines stipulate concentrations not exceeding 40 μg/m 3 24 ...
For a tube of silicone rubber [2] with a tensile strength of 10 MPa and an 8 mm outside diameter and 2 mm thick walls. The maximum pressure may be calculated as follows: Outside diameter = 8 millimeters (0.3150 in) Wall thickness = 2 millimeters (0.07874 in) Tensile strength = 10 * 1000000