PIPING CONCEPT
ON VESSEL
Presented by : S. LOGANATHAN
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PIPING CONCEPT ON VESSEL
PIPING CONCEPT ON VESSEL
Introduction
Types
Location
Fixing
Pipe routing
Nozzle Orientation
Maintenance
Other Considerations
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VESSELS - Introduction
Also called as “DRUMS” Used for
Î Intermediate containers
Î Collect liquids from vapour circuits
Î Chemical & Catalyst storage
Î Refluxing, surge, suction & general liquid collection
Î Steam Generation & Deaeration
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Horizontal vessel -Saddle
Vessel Supporting Types
VESSELS - TYPES OF SUPPORTS
Horizontal vessel - Saddle
Vertical vessel - Lug
Vertical vessel – Leg
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VESSEL – Support - Saddle Fixed Saddle
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VESSEL – Support - Saddle Sliding Saddle
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PDS ( Process Data sheet ) – Basic document of equipment containing minimum
information about essential nozzles, equipment size and nozzle elevations and locations ( if required )
MDS ( Mechanical Data sheet ) – Contains mechanical details
PID ( Piping & Instrumentation diagram ) – contains the process flow sequence of the vessel and elevation requirement if any.
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VESSELS - Location Adjacent to related equipment
Located on either side of “Pipe rack” Serviced by “Auxiliary Roads”
10 -P R E S 2 K 3 R 4 VESSELS - Fixing First step is “ Setting the height of Vessel” Required info;
Î NPSH (Net Positive Suction Head) or mini TL elev from P&ID
Î Vessel Size (PDS / MDS)
Î Type of Support (Skirt / Leg / Lug / Saddle)
Î Bottom Outlet Pipe Size
Î Minimum Clearances
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12 -P R E S 2 K 3 R 4 VESSEL - Fixing
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VESSEL – Fixing – Skirt type
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VESSEL – Fixing – Skirt type Support on CONCRETE
FOUNDATION (@ Grade)
Support on CONCRETE SLAB (@Floor)
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VESSEL – Fixing – Lug/Bracket type Support on STEEL STRUCTURE
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VESSEL – Fixing – Lug/Bracket type Support on CONCRETE SLAB
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VESSEL – Piping
A good Piping layout shall be developed having in mind Process flow sequence
Maintenance requirement Operability
Optimum economic piping
Other factors includes,
Sufficient head room shall be given for operator access No. of fittings used shall be minimized
Piping must be adequately supported to minimize pipe breakage Equipment nozzles shall have minimum nozzle loads
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VESSEL – Piping Piping on HORIZONTAL VESSEL
22 -P R E S 2 K 3 R 4 VESSEL – Piping Piping on HORIZONTAL VESSEL
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VESSEL – Piping Piping on HORIZONTAL VESSEL
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Nozzle Orientation Dwg – Horizontal Vessel
Î
No Separate Nozzle Orientation Dwg is required
Î
Directly comment on the MDS / Vendor Dwg
Î
Fixed / Sliding Saddle to be marked
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VESSEL – Piping Piping on VERTICAL VESSEL
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VESSEL – Piping Piping on VERTICAL VESSEL
28 -P R E S 2 K 3 R 4 VESSEL – Piping
Piping on VERTICAL VESSEL
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VESSEL – Piping Piping on VERTICAL VESSEL
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Î Piping descending along vessels shall be positioned at a suitable distance/radius from the vessel to allow the proper installation of supports
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VESSEL – Piping Piping on VERTICAL VESSEL
Î Piping shall be assembled in an area free from connections and oriented towards the pipe-rack
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VESSEL – Nozzle Orientation Dwg Important Notes:
Î Nozzle elevations not to be fixed by PIPING (by process)
Î Nozzle sizes & rating not to be changed by PIPING (by process)
Î Nozzle radius on top/bottom head not to be fixed by PIPING (by M&T)
Î Number of support legs/lugs …. By M&T only Apart from nozzle orientation dwg:
Î Piping shall confirm bottom T.L. elevation (based on mini elevation from process PIDs)
Î Piping shall fix Lug (bracket) elevation
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VESSEL - Piping – Maintenance Davit Arrangement
Î For removal of Control Valves/PSV on platf
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VESSEL - Agitator – Maintenance Monorail
Î For removal of Agitator-Motor
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VESSEL - Maintenance Using Mobile Crane
Î For removing internals of vessel located on top floor
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VESSEL - Other Considerations Insulation thickness
Slope requirement of horizontal vessel (see PID notes) Stiffener Rings