Mechanical QC Notes | General Information on Pressure Vessel

This article is about Mechanical QC Notes related to topic of General Information on Pressure Vessel as per Saudi Aramco or International Standards. This questions can be useful for who are attending CBT Aramco Test or other international test for Mechanical QC Inspector or Engineer.

Mechanical QC Notes | General Information on Pressure Vessel

PRESSURE VESSEL REFERENCE STANDARD

1. 1. SATID-D-001-01 Pressure Vessel Installation.
   2. SATIP-D-100-01  Field Erected Storage Tank (API 650).
   3. SATIP-D-109-01  Shop Fab. Storage Tank (API 12F/12P/UL 142).
   4. ASME Sec. VIII Div. 1-3 Rules for Construction for Pressure Vessels.
   5. API 650  Welded Steel tanks for Oil Storage.
   6. API 651
   7. 32-SAMSS-004 Manufacture of Pressure Vessels.
   8. 32-SAMSS-005 Manufacture of Atmospheric Tanks.
   9. 32-SAMSS-006 Manufacture of Low Pressure Storage Tank.
   10. SAES-D-001  Design Criteria For Pressure Vessels.
   11. 32-SAMSS-020 Manufacture of Trays and Packing.
   12. SAES-W-010 Welding Requirements for Pressure Vessel
   13. SAES-W-014 Weld Overlay and Welding of Clad Materials.
   14. VEFV1100/1102 Process Industry Practices (Fabrication/Installation).
   15. SAES-L-350  Construction of Plant Piping.
   16. SAES-B-054  Access, Egress & Material Handling for Plant Facility.
   17. SAES-B-006  Fireproofing for Plants.
   18. SAES-N-001 Basic Criteria, Industrial Insulation.

GENERAL INFORMATION ON PRESSURE VESSEL

• • Hydrostatic Testing of a completed pressure vessel shall not exceed 90% of the minimum yield strength.
  • Hydrostatic Pressure shall be 1.3 x MAWP as per ASME VIII Div. 1.
  • Holding time shall be 1hr/25mm of the vessel shell thickness or in no case less than 1 hour.
  • Medium shall be potable water with 50ppm chloride and pH = 10 to 11 and temperature of 17 °C.
  • Alignment shall be within 1/1000 but not more than 25mm.
  • Orientation tolerance shall be within ± 3mm.

PWHT (POST WELD HEAT TREATMENT) – applied to some welded steels in order to ensure that the properties of weldment will be suitable for intended applications often called Stress Relief.

– Intermediate Stress Relief = 600

– Intermediate Stress Relief = 600 °C for 1 hour.
– Dehydrogenation Heat Treatment = 350 °C for 4 hours.
– Specified PWHT area extending at least 6 times the thickness of the material being welded but not less than 25 mm from the edge of the weld, which is greater.
– If PWHT not perform in Furnace, insulation shall be applied 300 mm on either side of the weld, insulation shall be remove before the temperature has cooled to 150 °C.
– Minimum soaking time shall be 1 hour per 25 mm of thickness.

PWHT BENEFITS

– To improve the resistance of the joint to brittle fracture
– To improve the resistance of the joint to stress corrosion cracking
– To enable welded joints to be machined to accurate dimensional tolerance

PWHT HEAT SOURCES

– Permanent or Semi-permanent furnace using gas or oil or electric heater.
– Electrical Resistance Heater.
– Induction Heater.

THERMOCOUPLE LOCATION IN FURNACE

– Thinnest major component.
– Thickest member.
– Top of the vessel.
– Bottom of the vessel.
– Temperature recorder shall be calibrated every 3 months or can be extended to 12 months with aramco approval.
– Machine surfaces, flange faces, threaded bolt holes, threads, etc. shall be protected from oxidation it shall be coated with deoxiluminite or other suitable materials.
– After completion of PWHT attachment areas shall be ground smooth, if specified by inspector areas shall be examined by MT or PT after grinding.

PARTS OF PRESSURE VESSEL

1. Head
2. Shell
3. Nozzle
4. Support

TYPES OF VESSEL SUPPORTS

1. Lug Support
2. Leg Support
3. Saddle Support
4. Skirt Support

TYPES OF VESSEL INTERNAL

• Tray
• Inlet Distributor
• Anti-Vortex Baffle
• Catalyst Bed Grid & Support Beam
• Outlet Collector
• Flow Distribution Grid
• Cyclone and Plenum Chamber System
• Demister

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