Hi COCOE,
Some additional information which might be of interest to you.
-300 series cladding is used for corrosion resistance purpose only. From a sensible design perspective it's not advisable to include the clad thickness in nominal bvessel wall thickness calculation.
-Clad thickness generally specified are either 1/8" or 5/32" depending on the process media, corrosivity, design parameters,service life of the vessel... etc
-Thicker clad , more money.
-In a heat exchanger, tube sheets may be involve thicker cladding that specified above, subject to the parameters mentioned above
-Cladding on plates are done in the mill, mostly by roll cladding.Please seethe attachment for guidance.
-Many parts in a clad pressure vessel, e.g nozzles, fittings, Dished Heads and others as required , may involve clad deposition/restoration by welding. A barrier welding layer involving 309L(for 304L Clad) or 309LMo(for 316L Clad)needs to be deposited to take care of the dilution of weld metals. The final layer is always deposited by the electrodes/fillers matching the above specified chemistry.
-The typical limitations could be the shape ,size of the component.
-Performing PWHT after cladding.For C.S. vessels the nominal PWHT of CS base metal as per Sec-VIII, Div-1, is 1100Deg F, i.e. sensitization temperature for 300 series of austenitic steels.
-One may have to PWHT clad vessels at lower temperature(longer soak time) to avoid this scenario. UCL-66 provides guidelines to this.
-If PWHT is involved welding consumables & the clad base metals should involve IGC testing, ASTM-A-262, Practice-E(as minimum. These needs to be taken into consideration during the design stage.
You may find the information in the attachment as useful.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
All provided answer are personal opinions or personal judgements only. It's not connected with any employers by any means.