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The torispherical head 4200 mm Type A is an end component for a vessel, selected according to its design.
Germes-Ural manufactures Type A heads of diameter 4200 mm by cold flanging to GOST 34347-2017 and the agreed drawing. Strength calculations use GOST 34233.2-2017.
Specifications for torispherical heads 4200 mm Type A
| Parameter | Value |
|---|---|
| Diameter D | 4200 mm |
| Profile type | Torispherical, flanged, A |
| Wall thickness s | 6–22 mm; specific configuration subject to design calculations |
| Crown radius R | 4200 mm |
| Knuckle radius r | 420 mm |
| Dish depth h2 | According to the agreed drawing |
| Straight flange height h1 | Specified for the thickness and welded joint |
| Manufacturing process | Cold flanging |
| Documentation | GOST 34347-2017, GOST 34233.2-2017, technical specifications and customer drawings |
| Materials | Carbon, low-alloy and stainless steels; other materials as specified |
| Heat treatment | As required by the material and project |
| Inspection | Geometry, thickness, surface and compliance with the specification |
| Delivery | Russia and CIS countries |
Profile dimensions for D = 4200 mm, Type A
| D, mm | Type | R, mm | r, mm | s, mm | Heights h1 and h2 |
|---|---|---|---|---|---|
| 4200 | A | 4200 | 420 | 6–22 | According to the drawing |
R and r follow the company catalogue geometry for Type A: R = 1D and r = 0,1D, referenced to the internal surface. The table does not replace thickness calculations or agreement of the finished heights.
Manufacturing torispherical heads 4200 mm Type A
When forming Type A, checks cover the smooth transition from the crown to the knuckle. The straight flange and edge are prepared for the agreed welded joint. The drawing coordinates these operations with the actual blank thickness and material.
For diameter 4200 mm, agree the blank, joint preparation and finished Type A profile inspection plan. Radii R = 4200 mm and r = 420 mm are recorded in the working drawing together with thickness and surface requirements.
- Mating diameter 4200 mm and ovality
- Profile R=4200 mm, r=420 mm
- Finished part thickness
- Straight flange profile and edge preparation
- Surface condition and documentation requirements
Applications of torispherical heads 4200 mm Type A
Check the requirements for the equipment receiving the head: Heads for flare separators (FS), Heads for clarification filters. These links describe the equipment applications; suitability of a specific head is confirmed by the equipment design.
Specify Type A separately from the diameter. Submit the equipment operating conditions, openings and additional loads for review of the selected profile.
Torispherical head 4200 mm Type A — GOST requirements
Type A combines a spherical crown with a transition to a cylindrical straight flange. The crown and knuckle radii are agreed together because their combination defines the head profile and shell connection.
GOST 34347-2017 sets general manufacturing requirements for welded steel vessels; GOST 34233.2-2017 is used for calculations. The production range and profile radii are checked against the engineering documentation. For 4200 mm Type A, the catalogue specifies R = 4200 mm and r = 420 mm.
Maximum published diameter of A — Type A
Diameter 4200 mm is the upper limit of the published torispherical range. Agree the complete profile, material, thickness and delivery before ordering. The absence of a larger card marks the current catalogue limit.
For an order of 4200 mm Type A, state the drawing number and revision, material, thickness and acceptance requirements. Diameter 4200 mm does not replace the other specification requirements.
Materials
Carbon steels
20YuCh, 09G2S, St3sp5, St20, 17G1S
Aluminium alloys
AMg3, AMg5, AMg61 (1561), R-1407
Stainless steels
08(12)Kh18N10T, 10Kh17N13M2T, AISI 321, AISI 304, AISI 316Ti and Other
Titanium alloys
VT1-0, VT5, VT6, VT8, VT9, OT4-O
Quality inspection of heads 4200 mm Type A
The finished Type A profile is checked for mating diameter, ovality, radii and the transition zone. For a welded blank, weld and inspection requirements are specified in the documentation. Allowable pressure is established by calculation, not by the Type A designation.
- Diameter 4200 mm checked against the specified datums
- Checks of radii 4200 and 420 mm
- Finished component thickness measurement
- Inspection of the surface and transition zone
- Checks of the straight flange, edge and opening positions
Why choose Germes-Ural
- Dished end manufacturing since 2004;
- Our own manufacturing facility;
- Torispherical heads: diameters 600–4200 mm;
- Torispherical head thickness: specified within the catalogue range;
- Manufactured to GOST, technical specifications and customer drawings;
- Quality checks throughout manufacturing;
- Delivery across Russia and CIS countries.
Frequently asked questions
Will a diameter larger than 4200 mm be available?
It is not in the published range. A non-standard order requires a separate review without a manufacturing commitment.
How does this profile differ from other head types?
The catalogue Type A profile uses R = D and r = 0,10D. A change to Type B or C changes the profile and requires a drawing and calculation review.
What information is needed for a quotation?
Provide the design pressure and temperature, medium, material, thickness, profile drawing and quantity. For 4200 mm Type A, also specify R = 4200 mm and r = 420 mm.
What is the lead time for torispherical head type a 4200 mm?
The lead time is confirmed after reviewing the material, thickness, batch size and processing requirements. The indicative lead time of 7 days or more is confirmed in the quotation.
Which material grades are available for torispherical head type a 4200 mm?
The grade is selected to suit the shell material, medium, temperature and welding process. Availability of a particular combination is confirmed after reviewing the project.
Delivery of torispherical heads 4200 mm Type A
The head of diameter 4200 mm Type A is delivered after packaging and transport arrangements are agreed. Vehicle selection takes into account the actual dimensions, component weight and batch quantity.
Include the delivery destination and unloading restrictions in the enquiry. Protection of prepared edges and surfaces is agreed for the project and transport conditions.
Order torispherical heads 4200 mm Type A
Germes-Ural specialists will prepare a quotation and confirm the material, thickness and geometry requirements for your project.
This card describes diameter 4200 mm Type A. All sizes for this configuration and Other head types in 4200 mm.