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Aerospace pipe fittings with flanges for Marman clamps: a semi-rigid bleed air duct from a jet engine (left) and a semi-flexible fuel hose (right).. A common use for Marman clamps is as quick-disconnect connectors in flexible aircraft fuel lines.
Liquidtight flexible metal conduit (LFMC) is a metallic flexible conduit covered by a waterproof plastic coating. The interior is similar to FMC. The interior is similar to FMC. Flexible metallic tubing ( FMT ; North America ) is not the same as flexible metallic conduit (FMC) which is described in US National Electrical Code (NEC) Article 348.
A pipe clamp is a type of clamp often employed in piping, woodworking, and cabinet shops. Pipe clamps for woodwork or cabinet shops are usually composed of commercially manufactured clamp heads or "jaws" and a length of common threaded pipe. [1] [2] The capacity of the clamp is determined by the length of the pipe used.
It is available in diameters ranging from as small as 4" (10 cm) to as big as 18" (45 cm), but the most commonly used are even sizes ranging from 6" to 12" (15 to 30 cm). Flexible duct is very convenient for attaching supply air outlets to the rigid ductwork. It is commonly attached with long zip ties or metal band claps.
In the background of this photo is a duct flange. The duct flange normally has 3/4" bolts at 6" nominal; spacing. Duct flange angle thickness needs to be designed for duct plate tensile stresses, as flanges will bend. 5/16" or 3/8" angle thicknesses are common. See above photo of round duct elbows, transitions, and stiffeners.
The lifespan of ductile iron pipe installed in an aggressive environment without appropriate protection may be between 21 and 40 years. [6] [15] The introduction of corrosion mitigation methods for ductile pipe, including the use of polyethylene sleeving, can reduce corrosion by controlling the effect of corrosive soil on piping. [6]