| Customization: | Available |
|---|---|
| Certification: | ISO, TUV |
| Color: | Fixed |
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Hokkai Provided Hemispherical head to our clients with heavy wall thickness for oil&gas industry equipments
There are lots of requirements for this dished head included material plates, formings and tolerance.
The dished heads specification as the follow
HHA ID3015*MIN (50+3MM), CUT BACK 150MM
Material requriment
1, the supplier shall guarantee that the plates suppllied are free of cavity, lamination and cracking, and without any defects
2, no weld repair shall be permitted
3, the vendor shall guarantee the commodities furnished are the new ones
4, gengeal requirements of base metal shall conform to applicable requirements of ASME SA-20, and clading plates shall conform to applicable requirements of
ASME SA-480
5, The base plates of SA516GR70 shall be ultrasonically examined in accordance with A-579 level A, Supplementary requirements S1
6, The cladding metal and the base metal shall be heat treat per individual material specification before bonding. the heat treatment (simulated pwht of mechanical test oupons) for the cladding plates after bonding shall be as follows
heat treatment 1 cycle
Holding temperature 510+/-28degree
cooling rate max 56 degree/hr
holding time : min10hr
7,The minimum shear strength of the cladding plates shall be 20,000PSI(140MPA),Shear strength test shall be made in the manner indicated in ASME SA-264 FIG.1
For formed hemispherical head
1, the formed hemispherical head shall be spun or pressed form blanks of sufficient thickness to achieve at least the minimum thickness.
2, the vendor shall guarantee the formed hemispherical head are the new one.
3,each head in welding bevel edge shall be 100% magnetic=particle examination to avoid flaws,cracks,laminatons or others defects.
4, welding groove shall be shaped to the final welding geometry and 100% magmetic particle examination for defects.
5, tolerance for formed hemispherical head shall conform to UG-81,ASME Code section Viii-1, although the following tolerance as shown in drawing, are not
covered by the code and shall be adhered to by the supplier
6, inside and outside surface of formed hemispherical heads before shipment shall be cleaned,dry and free of scale
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