Metallic

Testable Ply Bellows

flexican is the only supplier in India of this design. - Specialize design for Hazardous application. - Facility available for remote sensing of ply failure. For more detailed information, please write to us.

Double Bellows

Double Bellows are the type of expansion joints where two bellows are provided. The use of these expansion joints are for applications where absorption of high thermal expansion or contraction of straight pipe runs is desired. The joint can be located near the center of the run, and proper anchors and guides has to be provided. Each Bellows in this case act as a single expansion joint.

Universal Bellows

A Universal Expansion Joint is one containing two bellows joined with a spool piece for the purpose of absorbing any combination of the three basic movements: Axial movement, Lateral deflection and Angular rotation.

The primary purpose of Universal Bellows is to accept large amount of lateral deflections which in fact is a function of the amount of angulations each bellows can absorb and the distance between the two bellows. The length of the center spool piece can be adjusted so as to increase or decrease the lateral deflection capability.

flexican also designs and supplies Universal Bellows with or without tie rods, which connects the ends of the unit to each other and restrains the pressure thrust load. The number of tie rods to be provided around the circumference of the expansion joint depends on the application, for instance two tie rods are provided 180 degrees apart which enables the expansion joint to bend or deflect angularly and laterally. Similarly three or more tie rods are provided equally by pressure thrust and in such cases only lateral deflections are possible without any significant forces being applied by the adjacent piping.

Universal Bellows Expansion Joints are usually long and are designed such that the thermal expansion of the entire unit's length is accepted as compression by the two bellow elements and as a result the overall length of the unit does not change when the piping is heated.

Gimbal Bellows

Gimbal Bellows which can permit angular rotation in any plane, consist of two pair of hinges affixed to a common floating gimbal ring. The Gimbal Bellows Expansion Joints are similar to Hinge type except that unlike Hinged Bellows which are limited to deflection in only one plane, Gimbal Bellows can accept bending or angulations in any plane.

It contains two hinge pins, the axis of each being perpendicular to the other. Each set of pins is connected to each other with a central gimbal ring. It provides similar restraint and resistance to axial forces such as the pressure thrust and to shear forces as the hinge type apart from having other features like absorbing angular rotation, preventing torsion on bellows and no main anchors required.

Hot Blast Main

Hot Blast Main Bellows designed for temperature 1400 °C made from Incoloy 825 to SB424 UNS NO8825. Made first time in India for M/s SAIL Rourkela Steel Plant. Also supplied to SAIL Bokaro, Bhilai

Tied Lateral Bellows

The Bellow assembly Consist of two Tie Rod with spherical washer arrangement to absorb Pressure Thrust forces produced under pressure. Tied bellow cannot take any Axial Movements except within Tie rod. Tied bellow can eliminate Main Anchor.

Hinged Bellows

Hinged Bellows, either Axial or Universal type, are designed to absorb angular rotation in one plane only by the use of a pair of pins through hinge plates attached to the expansion bellows.

Hinged Expansion Bellows should be used in sets of 2 or 3 to function properly. Hinged Bellows are normally prevented by their design from deflecting axially, either in extension or compression. The hinge mechanism is usually designed to accept full pressure thrust and also shear loads such as from the weight of the adjacent piping, can be accepted by these type of expansion joints thereby doing away with provision of additional supports and anchors.

Hinged Bellows also have added benefits of positive control over the movements, eliminates pressure thrust forces, transmits external loads, prevents torsion on bellows and are the most efficient in absorbing of thermal deflections.

Jacketed Bellows

It consist of an inner and an outer bellows. The Outer bellows conduct the heating or cooling agent, whereas the actual medium handled is conveyed through the internal bellows; occasionally the reverse arrangement is also used.

Pressure Balanced Bellows

Pressure Balanced Bellows Expansion Joints are normally used where a change of direction occurs in a run of piping and pressure thrust to be absorbed.

The deflections are controlled by the universal type expansion joints so as to accept the lateral movements and the pressure balanced elbow is usually required to accept the axial deflections also present. Moreover a bellow is also incorporated beyond the elbow in order to accept the various movements present & to balance thrust force. This balancing bellow is connected by tie rods to the pipe beyond the universal section which enables the pressure thrust to be contained as tension in the tie rods.

The main features of these bellows is that apart from absorbing axial and lateral movements, the pressure forces remain in balance, the balance pressure thrust remains constant and there is no volume change.

Universal Gimbal Bellows

This type of Expansion joints is used to thermal movement absorption in multi plane direction of piping.

Tuyere Stock Compensator

Blast Furnace Stove Bellows with Refractory lining, temperature 1400 °C. Size : 400 NB & 500NB for M/s SAIL-Rourkela, Bhilai, Bokaro, Tata metallic, Hospet steel and various steel plants.

Inline Pressure Balanced

The principles of In-line pressure balanced bellows expansion joints is more or less similar to the Pressure balanced bellows except that the axial pressure thrust is reacted by the pressure acting on a cross sectional area equal to the area of the working of primary bellows.

A constant volume arrangement created by two balancing bellows whose difference in cross sectional area is twice that of the in-line bellows thus eliminating the pressure-thrust without change in direction.

As this expansion joint is entirely axial and there being no directional changes in the pipe, the cross sectional area needed to balance the pressure is placed around the outside of the unit. Moreover as the pressure forces are generated by the pressure acting on the annular surface between the primary and the outer balancing bellows, the arrangement of the tie rods transfers and balances the pressure thrust created in the pipe on each end.

Single Miter Rectangular Expansion Joints

Rectangular joints are most commonly used in low pressure ducting to absorb thermal growth, addition of flexibility in short runs, and as vibration absorbers adjacent to fans, blowers and other mechanical equipment. In general, they are used in the same manner as the corresponding circular joint.

Rectangular Expansion Joints have applications in the cement, power, petrochemical, refining, chemical and steel industries.

The main features of these expansion joints are that they absorb axial and lateral movements, absorb displacements due to thermal expansion, balance pressure thrust remains constant and they eliminate main anchors.

Round Corner Rectangular Expansion Joints

Round Corner Rectangular Expansion Joints works on the similar principles of the Rectangular Expansion Joints. Application Turbine exhaust made for M/s Indian Oil Corporation Limited - Panipat Refinery through M/s BHEL under third party inspection by M/s Lloyd's Register Asia. Size: 1600mm x 500mm x 1000mm long. Also supplied to M/s. RUPPL –Size 5164 mm x 1864mm x1000 ll Lg Hazira & Dahej through BHEL

Oval Bellows Expansion Joints

Oval type Expansion Joints are also most commonly used in low pressure ducting to absorb thermal growth, addition of flexibility in short runs, and as vibration absorbers adjacent to fans, blowers and other mechanical equipment. In general, they are used in the same manner as the corresponding circular joint.

Oval type Expansion Joints Application: Turbine exhaust made for M/s HNL Kottayam through M/s BHEL under third party inspection by M/s Lloyd's Register Asia. Size : 1160mm x 800mm x 1000mm long.