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Standard dimension ratio (SDR) is a method of rating a pipe's durability against pressure. The standard dimension ratio describes the correlation between the pipe dimension and the thickness of the pipe wall. [1] Common nominations are SDR11, SDR17, SDR26 and SDR35. Pipes with a lower SDR can withstand higher pressures.
British Standard Pipe (BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external thread with an internal (female) thread.
An assortment of PG cable glands.Similar glands with DIN/ISO metric threads are also available. The Stahlpanzerrohrgewinde (German: [ˈʃtaːlˌpantsɐʁoːɐ̯.ɡəˌvɪndə], "steel conduit thread") standard for screw threads, more often called by the shortened Panzergewinde (German: [ˈpantsɐɡəˌvɪndə]), was a technical standard created in Germany and subsequently used in Switzerland ...
According to a 2008 study by Koo et al., ductile iron pipe had the lowest impact on natural resource depletion, compared to HDPE pipe and PVC pipe. [30] In November 2012, ductile iron pipe manufactured in the United States received certification as a sustainable product from the Institute for Market Transformation to Sustainability. [7] [8]
The ASA (as for American Standards Association) photographic exposure system, originally defined in ASA Z38.2.1 (since 1943) and ASA PH2.5 (since 1954), together with the DIN system (DIN 4512 since 1934), became the basis for the ISO system (since 1974), currently used worldwide (ISO 6, ISO 2240, ISO 5800, ISO 12232).
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