Recent content by amnoorulaman

What is the ASTM code for the following? i. CS pipe ii) CS fittings iii)CS flanges iv)AS pipe P5/P11 v)Cast CS Valves Answer: i. CS pipe = A106 Gr.B ii. CS fittings = A234 Gr.WPB/WPBW iii. CS flanges = A105 iv. AS pipe = A335 Gr P1/P11 v. Cast CS Valves = A216 Gr.WCB

What do you mean by NPSH? How do you calculate it? NPSH: Net Positive Suction Head. NPSH is the pressure available at the pump suction after vapour pressure is substarcted. It is calculated as : Static head + surface pressure head - the vapor pressure of your product - the friction losses in the...

What do you mean by Cavitation in Pump? A pump is designed to handle liquid, not vapour. Vapour forms if the pressure in the pump falls below the liquid’s vapour pressure . The vapour pressure occurs right at the impeller inlet where a sharp pressure drop occurs. The impeller rapidly builds up...

Concentric reducer is used in pump suction. (Yes / No). Explain. Answer: No. Air pockets may form if concentric reducer is used at pump suction, which results in Cavitation, and cause damage to Pump. To avoid this problem, Eccentric Reducer with Flat Side Up (FSU)is used in Pump Suction...

What should be the radius of long radius elbow? Answer: 1.5D (Where “D” is the diameter of the pipe) 14. Normally where do we use the following? i. Eccentric reducers ii)Concentric reducers Answer: i. Eccentric reducers = Pump suction to avoid Cavitation, To maintain elevation (BOP) in rack. ii...

What do you mean by following type of welding? i. SMAW ii)TIG Answer: ii. SMAW = SHIELDED METAL ARC WELDING iii. TIG = TUNGSTEN INTER GAS WELDING

While welding of pipe trunion to pipe/reinforcement pad you have to put a hole or leave some portion of welding why? Answer: For venting of hot gas which may get generated due to welding

What is the difference between machine bolt and stud bolt? Answer: Machine bolt has a head on one side and nut on other side but stud bolt have nuts on both sides.

Write down the outside diameter of following pipe? i. 3 inch ii) 6 inch iii) 10 inch iv) 14 inch Answer: i. 3 inch = 88.9mm ii)6 inch = 168.28mm iii) 10 inch = 273.06mm iv) 14 inch = 355 mm(OD= Size X 25.4)

From which size onwards NB of pipe is equal to OD of Pipe? Ans: From the size 14” and onwards NB = OD of pipe.

What is the difference between Pipe and Tube? Ans: Pipe is identified by NB and thickness is defined by Schedule whereas Tube is identified by OD.

What is this item? i. ISA-100X100X12 ii) ISA-80X50X10 iii)ISLT-100X100 Answer: i. Equal angle size 100x12 THK ii. Unequal angle size 80x50x10 THK iii. Indian STD light weight tee bar size 100x100

What do you mean by following items? i. )ISLB-400 ii) ISMB-600 iii) ISHB-350 iv) ISMC-300 v) ISJB-150 vi) ISLB-200 vii)ISMB-450 viii)ISWB-400 ix) ISJC-200 x) ISLC-350 xii) ISMC-250 Answer: i. Indian STD light weight beam, Web size – 400 ii. Indian STD medium weight beam, Web size – 600 iii...

What is the ASME code followed for design of piping systems in Process pipings (Refineries & Chemical Industries)? (i) B31.1 (ii) B31.3 (iii) B31.5 (iv) B31.9 Answer (ii) cont... pipingguide.blogspot.com

Piping and Instrument Diagram The single most important drawing for the installation of piping systems is the Piping and Instrument Diagram (P&ID). It provides the base design description of the required pipe routing and sizing, flow direction and slope, instrumentation and controls...