Thursday, February 24, 2011
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Tuesday, February 8, 2011
What is the material applied on the flanges or valves to obtain smooth surface for application of cold tape?
Ans: Moulding compound shall be hand applied to obtain smooth surface for application of cold tape on flanges / valves
What is the minimum overlap of field wrapping(cold tape) on shop wrapping?
Ans: Wrapping shall start and finish to give a minimum 75mm overlap onto the adjoining shop coating.
What is cold type of wrapping?
Ans: PVC backed bituminous compound tape used for field wrapping is called cold wrapping.
What should be the minimum staggering of inner & outer wraps?
Ans:- The overlaps of the inner and outer wraps shall be staggered from each other by minimum distance of 100mm
What should be the overlap between inner & outer wrap?
Ans:- The inner and outer wraps shall be overlapped by 25mm
How much should be the depth of pulling of Inner Fibre glass tissue into the hot enamel?
Ans: The inner wrap of Fibre-glass tissue pulled in such a manner that the same is imbedded half way into the enamel without touching the steel surface.
What should be the minimum thickness of enamal on any point on pipe?
Ans: The enamel shall have minimum thickness of 2.4 mm when measured on top of the weld with an overall thickness of 4mm.
Which material is used as inner and outer wrapping?
Ans: Fibre glass tissue consisting of a uniformity porous mast of chemically resistant boro-silicate glass containing not less then 5%
What is upper yield point with reference to above stess-strain graph (UTS)?
Ans: The highest stress that the metal can withstand under sustained load without continuing to elongate under same load is called the upper yield point
What is stress?
Ans: It is defined as the applied load per unit cross section of the specimen. The common unit are PSI(Pound Per Square Inch), KPA, MPA, KG/CM
What are the factors upon which the mechanical properties of material are dependant?
Ans: Mechanical properties of any material of construction are dependent on:-
A) Chemical composition of the material
B) Method by which the material is manufactured
A) Chemical composition of the material
B) Method by which the material is manufactured
What are the Failures with reference to the structural design?
Ans: Failure of a structural part can occur by:-
A) Excessive elastic deformation
B) Excessive non-elastic deformation
C) Fracture
Any design has to guard against these perceived failures.
A) Excessive elastic deformation
B) Excessive non-elastic deformation
C) Fracture
Any design has to guard against these perceived failures.
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