dished heads _ head types

8/13/2019 Dished Heads _ Head Types

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We manufacture a range of dished heads and cones to varying shapes and standards.This includes Torispherical, 2:1 Semi-Ellipsoidal, Hemispherical, Shallow Head, Cones

and Cones for Pressure Vessels, Flat, Inverted Dish and Inverted Cones.

Torispherical.Torispherical.Torispherical.Torispherical.


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Torispherical heads are the most commontype of head used for the manufacture ofpressure vessels and usually the most

economical to form.The I.C.R is equal to the I.D of the head orless. We normally suggest allowing the I.C.Rto be between 90% to 95% of the I.D of thehead.

The I.K.R needs to be between 6% and 10%of the I.C.R of the head.

The S.F is normally between 10mm and 30mm depending on the diameter and thicknessof the head to be formed.

2:1 Semi-Ellipsoidal.2:1 Semi-Ellipsoidal.2:1 Semi-Ellipsoidal.2:1 Semi-Ellipsoidal.

2:1 Semi-Ellipsoidal heads are deeper than atorispherical head and therefore stronger

and able to resist greater pressures. Theseheads are more difficult to form owning tothe greater depth required. As a result theseare more expensive to form than atorispherical head, but may allow a

reduction in material thickness as thestrength is greater.The I.C.R is 0.8 of the O.D of the head.


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The I.K.R is 0.154 of the O.D of the head.The maximum diameter we can form a 2:1 Semi-Ellipsoidal head to is 2310mm I.D.The S.F is normally between 10mm and 30mm depending on the diameter and thickness

of the head to be formed.

Hemispherical.Hemispherical.Hemispherical.Hemispherical.

Hemispherical heads allow more pressurethan any other head. However, thehemispherical head is the most expensive toform, as they consists of a number of petalsor gores. The number of which depends on

the size of the head and the thickness of theplate to be used. The depth of the head ishalf of the diameter.

Hemispherical heads are also used in

architectural applications by joining twohemispheres together to form a sphericalball. Other common applications are for stainless steel cooking kettles with steam

jackets.

Shallow Head.Shallow Head.Shallow Head.Shallow Head.Shallow heads are the most common type of


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head used for the manufacture ofatmospheric tanks and vessels and usuallyused on horizontal tanks fabricated to

AS1692. These heads are not suitable forpressure vessels and not recommended fortanks or vessels with external loads. I.e.agitators, nozzles with high loads. If unsure,you should have the design checked.

We normally suggest allowing the I.C.R to be between 1.5 to 2.0 times the I.D of thehead.This can be adjusted if you require a specific depth of head.The I.K.R for these heads is usually 32mm, 51mm or 76mm depending on the diameter

and customer requirements.The S.F is normally between 10mm and 30mm depending on the diameter and thicknessof the head to be formed.

Cone.Cone.Cone.Cone.Cones are the most common type of headused for the manufacture of atmospherictanks and especially stainless steel tanks.

However they can be used in themanufacture of pressure vessels subject tocertain criteria as listed below. (Cones forpressure vessels)


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Cone angles are variable and are at thediscretion of the customer.The I.K.R for most cones is usually 25mm,

32mm, 51mm, 76mm or 102mm dependingon the diameter, thickness and customerrequirements. We are able to form larger

knuckles on some cones, subject to the material thickness and cone angle.

Cones for Pressure Vessels.Cones for Pressure Vessels.Cones for Pressure Vessels.Cones for Pressure Vessels.

The maximum internal apex angle for cones to be used in the fabrication of a pressurevessel is 120 Degrees.

The I.K.R for cones to be used in the fabrication of a pressure vessels need to be aminimum of 6% of the inside diameter of the vessel.The S.F is normally between 10mm and 30mm depending on the diameter and thicknessof the head to be formed.

Flat.Flat.Flat.Flat.A flat end with a knuckled outer edge.Typically used as bases on verticalatmospheric tanks and lids for smallertanks.The I.K.R for most flat ends is usually25mm, 32mm and 51mm depending on the


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diameter, thickness and customer requirements.We are able to form larger knuckles onsome flat ends, subject to the material thickness and diameter.The S.F is normally between 10mm and 30mm depending on the diameter and thickness

of the head to be formed.

Dish.Dish.Dish.Dish.

Dished only heads are generally used foratmospheric tanks and vessels and for bulkheads or baffles inside horizontal tanks ortankers.Typically the I.C.R is equal to the diameter

or dished to a nominated I.C.R by the client.


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Inverted Dish.Inverted Dish.Inverted Dish.Inverted Dish.

Inverted Head. Generally used on tanks and vessels requiring the strength of a dishwhilst minimising the depth. Useful in the construction of tanks and silos by providing asloping, fully draining base with radius corners.Can be used in pressure vesselapplications. More expensive to form and knuckle than a regular torispherical head.

Inverted Cone.Inverted Cone.Inverted Cone.Inverted Cone.Generally used on tanks and silos requiringa sloping, fully draining base with radiuscorners. Can be used on large stainless steel

milk silos in lieu of a flat sloping base toprotect against oil canning and subsequentstress cracking of weld seams during the hot/ cold CIP process. More expensive to form

and knuckle than a regular cone.

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New Dookie Road, Shepparton Victoria Australia 3632 Tel: +61 3 5832 1400 Fax: +61 35832 1410 [email protected]

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