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amnoorulaman

Piping course

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Dear Engineers,

I am Noorul Aman. I am a mechanical engineer in the field of PIPING AND CONST/ARCI.

Here I want to shear whatever I gather the information about engineering field with you.

Piping/Mechanical Design Drawings

GENERAL

The primary drawings that a Piping/Mechanical Field Engineer will use in the course of completing

a field assignment are:

· Piping and Instrument Diagram (P&ID)

· Piping Isometric

· Plot Plans

· Piping Class Sheets

· Piping Support Details and Hanger Drawings

· Vendor Drawings and Manuals

· Instrument and Tubing Drawings

· Standard Instrument Details

· Steam heat Tracing Drawings

These drawings along with project installation specifications provide quality guidelines for properly

completing the assigned system.

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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, insulation, heat tracing, and

equipment and/or instrument references. This provides a road map to finding other drawings,

vendor data, and piping information to properly complete the installation. The P&ID does not

however provide dimensional data or physical locations of any commodities.

The Piping Line List and the Instrument Index are issued documents which often provide this

information.

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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. Indian STD ‘H’ beam, Web size – 350

iv. Indian STD medium weight channel, Web size –300

v. Indian STD junior beam, Web size – 150

vi. Indian STD light weight beam, Web size – 200

vii. Indian STD medium weight beam, Web size – 450

viii. Indian STD wide flange beam, Web size – 400

ix. Indian STD junior channel, Web size – 200

x. Indian STD light weight channel, Web size – 350

xi. Indian STD medium weight channel, Web size – 250

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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. Concentric reducers = Pump discharge, vertical pipeline etc.

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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.

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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 the

pressure which collapses vapour bubbles causing cavitation and damage . This is

avoided by maintaining sufficient NPSH.

(Cavitation implies cavities or holes in the fluid we are pumping. These holes can also

be described as bubbles, so cavitation is really about the formation of bubbles and their

collapse. Bubbles form when ever liquid boils. It can be avoided by providing sufficient

NPSH.)

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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

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PETROSYNC proudly present the next "ASME B31.3 Process Piping Code Design Requirements”
we would like to invite you to join This Training Course in Bandung, Indonesia for 5 days; from 9-13 March 2015
For further assistance Please contact my mail : adminjkt@petrosync.com or +65 6415 4500
Thank you

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On 10/6/2008 at 2:14 AM, amnoorulaman said:

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, insulation, heat tracing, and

equipment and/or instrument references. This provides a road map to finding other drawings,

vendor data, and piping information to properly complete the installation. The P&ID does not

however provide dimensional data or physical locations of any commodities.

The Piping Line List and the Instrument Index are issued documents which often provide this

information.

 

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On 12/10/2008 at 4:34 AM, amnoorulaman said:

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.

Pipe is a vessel and Tube is structural.  Manufacturing tubes are expensive than pipes, as the outer-diameter of the tubes need to be maintained within tight permissible tolerance.

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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 the

pressure which collapses vapour bubbles causing cavitation and damage . This is

avoided by maintaining sufficient NPSH.

(Cavitation implies cavities or holes in the fluid we are pumping. These holes can also

be described as bubbles, so cavitation is really about the formation of bubbles and their

collapse. Bubbles form when ever liquid boils. It can be avoided by providing sufficient

NPSH.)

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