Stainelss Steel Dished for Petroleum Oil, Chemical , Water Conservancy, Electric Power,Boiler, Metallurgy, Sanitary Tank Boiler Pressure Vessel , Heat Exchanger , LPG, LNG Tanks
Torispherical Dish Head For Pressure Vessel For Making Pressure Vessel , Heat Exchanger , Lpg, Lng Tanks
Boiler Elliptical End Cap
| Brand Name: | DR |
| Diameter: | 89mm-10000mm |
| Thickness: | 2mm--300mm |
| Reduction Ratio: | About 10% |
| Material: | Duplex steel,carbon steel,stainless steel,aluminum,titanium and etc. |
| Technology: | Hot pressing, Cold pressing |
| Surface Treatment: | Sand Blasting,Pickling |
| Test: | UT,RT,MT,PT,TOFD. |
| Applicable Standard: | ASME, PED and GB |
| Certificate: | ISO9001 ,ISO45001,OHSAS18001 |
| Applications: | Petroleum, chemical industry, water conservancy, electric power,boiler, machinery, metallurgy, sanitary construction etc. |
| Packaging: | wooden box and iron shelf or as percustomers requirement |
| Customized Product | Support |
1, Description
This is called an elliptical head. the shape of this head is more economical beasue the height of the head is just a graction of the diameter.its radius varies between the major and minor axis;usually ratio is 2:1
this size heads are used externsively in the construction of tanks for liquefied petroleum gas, air recievers and other unfired pressure vessels.these heads can be fored form carbon steel,stainless steel ,and other ferrous and non-ferrouns metals and alloys.
2, Application:
Gas and Oil industry, Petrochemical industry, food, etc
3, forming range (see below excel)
Note that:
A: The below heads was formed by hokkai with one piece plate,
B: Pls check with me if the range is out of the below range, pls contact with me
C, the forming range is not included in petals fabrication way.
4, Order information
Pls provide us with below information
1) Material grade. Including special requirement if have
2) Head Diameter
3) Nom THK or min thick
4) Straight Flange if have
5)others special forming process
Customizing various shapes of heads with ASME VIII-1 with U stamp, EN1345, AS1210 or China code etc.
Pls contact with me by the below E-mail adress if you have any further queries.
Cold press range:
| Diameter | 200mm-3200mm |
| Thickness | 2mm-24mm |
Cold Spinning
| Diameter | 750mm-9000mm |
| Thickness | 2mm-42mm |
Segment forming
| Diameter | no limit |
| Thickness | below 90mm |
| Standard Dished Heads for Tank | |||||
| Diameter | Thickness(Mm) | Material | Exw Unit Price | ||
| ND1440 | 8 | Q235-A | USD | 213.00 | per piece |
| ND1528 | 8 | Q235-A | USD | 227.00 | |
| ND1570 | 6 | Q235-A | USD | 220.00 | |
| ND1716 | 6 | Q235-A | USD | 245.00 | |
| ND1750 | 6 | Q235-A | USD | 257.00 | |
| ND1900 | 6 | Q235-A | USD | 265.00 | |
| ND1980 | 6 | Q235-A | USD | 272.00 | |
| ND2500 | 6 | Q235-A | USD | 359.00 | |
| ND2000 | 6 | Q235-A | USD | 246.00 | |
| ND2100 | 5 | Q235-A | USD | 229.00 | |
| ND2100 | 6 | Q235-A | USD | 279.00 | |
| ND2150 | 6 | Q235-A | USD | 293.00 | |
| ND2600 | 6 | Q235-A | USD | 382.00 | |
| ND2420 | 6 | Q235-A | USD | 341.00 | |
| ND2250 | 6 | Q235-A | USD | 301.00 | |
| ND2450 | 6 | Q235-A | USD | 344.00 | |
| ND2300 | 6 | Q235-A | USD | 309.00 | |
| ND2200 | 6 | Q235-A | USD | 288.00 | |
| ND2400 | 6 | Q235-A | USD | 332.00 | |
| ND2400 | 5 | Q235-A | USD | 309.00 | |
| ND2480 | 6 | Q235-A | USD | 351.00 | |
| ND2550 | 6 | Q235-A | USD | 368.00 | |
Minimum Thickness Tank Dish Head
Ellipsoidal Head (EHA OR EHB) Inspection standard
Section shape gap: Outside convex≤1.25%Di; Inside concave≤0.625%Di. (Full size sample plate whose chord length is equal to Di is used for measurement.)1.Measure four inside diameters which distribute in the same distance at straight edge. The difference between the measured maximum value and the measured minimum value is the roundness tolerance.
2.The roundness tolerance is not larger than 0.5 % Di, and 25mm;
3.While δ s/Di < 0.005 , and δ s < 12mm, the roundness tolerance is not larger than 0.8 % Di, and 25mm.
| The tolerance of slope and dimension and groove roughness | |||||||||
|---|---|---|---|---|---|---|---|---|---|
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| External circumference tolerance and inside diameter tolerance | ||||||||||||||||||||||||||||
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| Notes:While Di ≥ 1000 and δs < 10mm , take external circumference tolerance as criterion. The inside diameter tolerance or the external circumference tolerance can be decided through the discussion between the two parties. Notes:1 Standard length of external circumference = (inside diameter nominal thickness 2 ) π (3.1416). 2 Under the circumstance of inside diameter tolerance, measure four inside diameters which distribute in the same distance at straight edge, and take the average value of measured inside diameter. |
| Surface quality |
|---|
| 1.The measured minimum thickness of welding seam shall not be less than the minimum guaranteed thickness. The welding seam height should not be 0.5mm lower than mother material. 2.Under the circumstance of step stamping, circle impression will be taken place. The gap measured by sample plate should be less than 1.5mm . 3.The pits on the material surface should be ground. The grinding depth should be less than 5% δ s and 2mm . Otherwise compensating welding is needed. 4.The depth of the riffle on end cover surface shall not be larger than 0.2mm . While the ground area on end cover is less than 20%, surface treatment should be done over whole end cover. 5.If customers have special requirements for end cover surface, shall follow the customers' requirements. |