General Guaidline for Fabrication of Pressure Vessel

1. Code of construction of Pressure Vessel should be noted on Mechanical Data Sheet or Fabrication Drawing.
2. Latest Applicable Code of Construction Shall be made in all aspects.
3. Design and fabrication Drawing should be approved by the client before starting of fabrication of pressure vessel.
4. Thickness Indicated on fabrication drawing shall be minimum Thickness and shall be achieved after fabrication or machining.
5. Any Change in Thickness on higher side shall be acceptable but written approval shall be taken by Client before commencing of further work.
6. Tolerance for fabrication shall be maintain within limits given by the client.
7. Tested Material Should be used in fabrication of Pressure vessel.
8. All External weld Shall be wire brush and weld spatter remove from joints completely.
9. Vessel Shall be Cleaned from inside and all Dust,Dirt,Slag etc shall be removed before hydro testing of vessel.
10. Vessel Shall be dried after Hydro testing.
11. All Internal part preferably be of removable type and maximum weight of the individual piece shall not exceeds 20 kg.Unless noted otherwise on Mechanical datasheet .
12. Only Qualified Welder Shall be Deployed for Fabrication of pressure vessels.
13. Whenever Spot Radiography Specified on the Drawing it means that minimum 10% radiography of Longitudinal and Circumferential Seam. & 100% Radiography of all "T" joints.
14. Nozzle Neck Shall be Made from Seamless Pipe & If Nozzle fabricated from Plate then Weld seam shall be 100 % Radio graphed.
15. Dish end Shall be normally made from single plate. large sized Dish end may be fabricated by joining plates. this joint shall be 100% radiography after forming. Joint Location and Detail Indicated on fabrication Drawing & "T" Joint to be avoided.
16. Internal Coil,Suction Heater,External Limpet Coil Shall be separately hydro tested When main Shell is not under hydro tested.
17. All Manhole Cover or Blind Flanges weighing more than 30 Kg that shall be provided with Davits and hinges.