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A general practice is to size the sleeve two NPS (pipe sizes) up from the diameter of the penetrant. For example, a 4" pipe, with 1" of thermal insulation makes a 6" penetrant (1" pipe covering on each side of the pipe), plus two pipe sizes = an 8" sleeve, creating a 1" annulus.
Nanoconcrete (also spelled "nano concrete"' or "nano-concrete") is a class of materials that contains Portland cement particles that are no greater than 100 μm [88] and particles of silica no greater than 500 μm, which fill voids that would otherwise occur in normal concrete, thereby substantially increasing the material's strength. [89]
Silk is an American R&B group, formed in 1989 in Atlanta, Georgia. They are best known for their 1993 hit single, " Freak Me ", which reached number-one on the US Billboard Hot 100 . Career
The production of silk originated in China in the Neolithic period, although it would eventually reach other places of the world (Yangshao culture, 4th millennium BC). Silk production remained confined to China until the Silk Road opened at some point during the latter part of the 1st millennium BC, though China maintained its virtual monopoly over silk production for another thousand years.
This page is subject to the extended confirmed restriction related to the Arab-Israeli conflict. Kufiyyeh Yemeni man wearing a keffiyeh in turban-style and a Yemeni shawl on his shoulder The keffiyeh or kufiyyeh, also known in Arabic as a hattah (حَطَّة, ḥaṭṭa), is a traditional headdress worn by men from parts of the Middle East. It is fashioned from a square scarf, and is usually ...
Spider silk structure: crystalline beta-sheets separated by amorphous linkages. Silks have a hierarchical structure. The primary structure is the amino acid sequence of its proteins (), mainly consisting of highly repetitive glycine and alanine blocks, [4] [5] which is why silks are often referred to as a block co-polymer.