Basic Knowledge of Piping Isometric.

  BASIC KNOWLEDGE OF PIPING ISOMETRIC 


INDEX:- 


Isometric 

Direction & location

Checking list of Isometric

Short Code of Isometric

Documents for isometric

Point remember for isometric checking

Basic Symbols for Isometric.



What is an Isometric Drawing?

  • An isometric drawing is a type of pictorial drawing in which three sides of an object can be seen in one view.
  • It’s popular within the process piping industry because it can be laid out and drawn with ease and portrays the object in a realistic view
  • Isometrics are used as fabrication & shop drawings for pipe run fabrication.
  • Isometrics also provide a drafter with the ability to calculate angular offsets in the pipe run.
  • piping isometrics allow the pipe to be drawn in a manner by which the length, width and depth are shown in a single view. Isometrics are usually drawn from information found on a plan and elevation views. 
  • The symbols that represent fittings, Valves and flanges are modified to adapt to the isometric grid. Usually, piping isometrics are drawn on preprinted paper, with lines of equilateral triangles form of 60°.
  • Isometric  are not drawn to scale, dimensions are required to specify exact lengths of piping runs.
  • Pipe lengths are determined through calculations using coordinates and elevations. Vertical lengths of pipe are calculated using elevations, while horizontal lengths are caculated using north-south and east-west coordinates. 
  • Piping isometrics are often used by designers prior to a stress analysis and are also used by draftsmen to produce shop fabrication spool drawings. Isometrics are the most important drawings for installation contractors during the field portion of the project. 

Direction & location?

  •  Location and direction help to properly orient the isometric drawing A north arrow give direction and should ALWAYS point to the upper-right corner of the paper
  • Structural reference points that provide location location can be shown on isometric
  •  Dimensions MUST always be given to points of reference; such as structures, existing equipment…etc
  • Coordinates should also be shown on the isometric drawing.

Checking list of Isometric?

1) Line Number.
2) Line Specs
3) Start Point Location 
4) End Point Location
5) Branch Connection
6) Valve Accecibility
7) Support Number
8) Insulation (For Insulated Line Only)
9) Instrument Connection
10) Flow Arrow
11) High Point Vent & Low Point Drain
12) Hydro Test Vent And Drain
13) Nozzle Connection
14) Nozzle Nos.
15) Equipment Nos.
16) Coordinates And Elevations
17) Iso North
18) Bill Of Material
19) Valve Tag Nos.
20) Instruments Tag Nos.
21) Continuation Sheets Or Iso. Nos.
22) Grid Location And Nos.

Short Code of Isometric ?

1) Ibr - Indian Boiler Regulation Act
2) ASTM - American Society Of Testing Material
3) ANSI - American National Standard Institute
4) Smls - Seamless
5) Thd -  Threded
6) Bw -  Butt Welded
1) Sw - Socket Welded
2) Ecc. Red. - Eccentric Reducer
3) Conc.Red. -  Concentric Reducer
4) Eq.Tee -  Equal Tee
5) Red. Tee -  Reducing Tee
6) Clpg - Coupling
7) Vlv -  Valve
8) Str -  Strainner
9) T - Trap
10) Elb -  Elbow
11) Fof.El. - Finish Floor Elevation
12) Ptfl.El. - Platform Elevation
13) Gr.El -  Ground Elevation
14) Sch -  Schedule
15) Thk - Thickness
16) Eqpt  - Equipment
17) Sorf  - Slipon Rase Face
18) Soff -  Slipon Flat Face
19) Wnrf -  Weldneck Rase Face
20) Wnff  - Weldneck Flat Face
21) Bop.El. -  Bottom Of Elevation
22) Cl.El. - Center Line Elevation
23) Pcd -  Pitch Circle Dia.
24) Nb - Nominal Bore
25) Ns -  Nominal Size
26) Be -  Beveled End
27) Isi  - Indian Standard Institute
28) Fst  - Flat Side Top
29) Fsd -  Flat Side Down
30) Suc. -  Suction
31) Disch. -  Discharge
32) Wp.El. -  Work Point Elevation
33) Ga -  General Arrangement
34) P&Id  - Piping And Instrument Diagrames
42) HPP -  High Paving Platform

Documents for Isometric?

Some important Drawing list for Isometric checking. 
1) Study Layout
2) General Arrangement Drawings
3) Piping And Instrument Diagrams
4) Sectional Layouts
5) Civil Layouts
6) Equipment Layouts
7) Fabrication Details Drawing
8) Foundation Details Drawings
9) Structural Layout
10) Isometrics
11) Piping Details Layout
12) Nozzle Orientations
13) Plot Plan
14) Flow Diagrams


Point remember for isometric checking? 



1.  Pump Suction Is Bigger Than Discharge Line.


2. Eccentric Reducer (Flat Side Top) Using For Pump Suction Line This Is Using For Avoid The Air Block In Pump Suction.


3. Pump Suction Line And Compressor Suction Line Keep Always Downward Position, No Loops Permitted To Pump Suction.


4. Psv Outlet Always Rising Position.


5.  Check The Valve Accessibility For Maintenance Purpose.Valve Operating Height Min 250mm To 1200mm From Floor Level.


6.  Lift Check Valve Always Horizontally Using. Swing Check Valve Vertically and Horizontally Using.


7.  Control Station Operating Height 500mm to 750mm from Floor Level.


8.  Shoe Not Required For Trunion. (Insulated Lines).


9. Headroom Clearance Minimum 2.2m from Ground/Floor Level.


10. Drip leg required for Steam Line Header.


11. Shoe Required For Insulated Lines (Steam, Chilled Water, Brine, and Steam Condensate).


12. Shoe Not Required For Condensate Line When Line Will Be On Pipe Rack.


13. Nozzle Orientations Should Be Keeping As Per Piping Requirement.


14. Avoid The Obstacles. Keep A Piping Routing Neat And Clearly.


15. Control Stations Locates Side Of Near The Walls Or Columns.


16. Give A Trunion Supports To Control Station Both Side Of Control Valves.


Basic Symbols for Isometric:- 











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