Manhole covers finished of cast iron same as ductile iron, Civil Engineering

Assignment Help:

Question
Why are manhole covers finished of cast iron as same are through of ductile iron?

Answer
Usually, 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.


Related Discussions:- Manhole covers finished of cast iron same as ductile iron

Resultant pull, two locomotive moving on opposite bank of a canal can pull ...

two locomotive moving on opposite bank of a canal can pull a vessal parallel to the banks by the means of two rope.the force in the ropes are 20kN and 24kN while the total angle be

Importance of tendons in post-tensioned members, Importance of Tendons in p...

Importance of Tendons in post-tensioned members Tendons in post-tensioned members are subjected to different amounts of stresses (among themselves) due to following reasons.

Surveying, Describe the two fundamental purpose of surveying.

Describe the two fundamental purpose of surveying.

Explain the unit hydrograph - hydrology, Define Unit Hydrograph Hydrogr...

Define Unit Hydrograph Hydrograph of one inch or 1cm of precipitation over a drainage basin area (watershed). It is the base hydrograph from which other hydrographs can be dete

Determine the density index of the sand sample, An undisturbed sample of sa...

An undisturbed sample of sand has a dry weight of 18.9 N and a volume of 1143 cm 3 . The solids have a specific gravity of 2.72. Laboratory tests indicate void ratios of 0.40 and 0

Levelling, the cooke''s reversible level

the cooke''s reversible level

Define the ultrasonic thickness measurement, Define the Ultrasonic Thicknes...

Define the Ultrasonic Thickness Measurement? Ultrasonic thickness meters measure the thickness of steel by passing an ultrasonic wave through the member. Thickness measurements

Define the meaning of circular prestressing, Define the meaning of circular...

Define the meaning of circular prestressing In circular prestressing, tendon wires are wrapped under tension over the concrete pipes which are pre-cast. The tension in the ten

Explain some points regarding to hardness, Explain Some Points regarding to...

Explain Some Points regarding to Hardness 1) Hardness removal using lime and soda is based on the solubility reactions of calcium carbonate, CaCO 3 and magnesium hydroxide, Mg

Determine the expected extension at the jack, A cylindrical concrete tank,...

A cylindrical concrete tank, 30 m external diameter, is to be prestressed circumferentially by means of  high-strength steel wire (E, = 2 x  10 5   N/mm 2 )  jacked  at 4 points, 9

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd