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QuestionWhy are manhole covers finished of cast iron as same are through of ductile iron? AnswerUsually, manholes covers are made of cast iron. Though, in viewpoint of pipe preservation, frequent opening of manhole covers have to be approved out. Consequently, it poses potential safety hazard to workers through lifting-up procedure of manhole covers since cast iron manhole covers are incredibly heavy to regular workers. As a result, research has been conducted and ductile iron is measured as a better choice than cast iron as it be able to oppose same traffic loads with lesser self-weight. Furthermore, as ductile iron is less brittle than cast iron, usual cast iron manhole covers are additional susceptible to harm and thus need higher preservation cost. Though, ductile iron manhole covers do endure from some demerits. For case, owing to their relative small self-weight, vehicles transient over these manhole covers would lead to movement of covers and generate unpleasant noises. To solve this problem, in its place of increasing self-weight of elastic iron manhole covers which similarly causes safety trouble to workers throughout regular upholding, covers can be designed to be attached to the manhole frames which hold them in firm position.
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Q. Energy absorbed in heeling during vessel berthing? When a vessel berths on a fender system at a pier, point of contact of berthing ship can be below or above the centre of
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Explain the term - Moderate Prestressing In this form of prestressing, no limit is imposed on the magnitude of tensile stresses which may be produced in a concrete member unde
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How to construct Semi Ellitical Buildings of 15feet dia., in Brick Masonry.
Question What is main difference in application of surface-protecting fenders and energy-absorbing fenders ? Answer Surface-protecting fenders are fenders that make
Concrete surround is generally adopted for rigid drainage pipes to resist high traffic loads (for instance under shallow covers) and to allow for using pipes with lower strength. F
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