Re: Digest Number 901.(AFC Displacements)

From: <Tushar>
Date: Fri Jul 18 2003 - 05:25:00 EDT

This depends on how you support the AFC. Check the vendor drawing for this. Generally we suggest AFC vendor to fix it at mid point of header so that displacement of header in Z-direction is equal for both the nozzles. This is better arrangement from stress analysis point of view.This can be done by providing square block below the header at mid point which in turn engages with guideblock in tube bundle frame. Thus it acts like axial stop in Z-direction at the centre of header such that header expands equally from the centre.

Similarly, stationary side is guided by such blocks at both ends of AFC in X-direction such that all expansion goes towards the other end.

If your arrangement is same, Nozzle movement in X-direction will be zero, movement in Z-direction will be according to distance from midpoint of header to the nozzle in Z-direction and in Y-direction its distance from bottom point of header to the face of nozzle x Coefficient of thermal expansion.

Tushar K. Rajyaguru
Larsen & Toubro - Chiyoda Ltd.,

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Can anybody explain how the nozzle movement of Air Fin Cooler header in header axial direction. The particular problem faced by us like this.

The inlet and outlet nozzle of AFC is located on stationary end side(nomal case) . There are four header each having four nozzles( 2 inlet top nozzles and 2 outlet bottom nozzles) . AFC is located along Caesar X axis. Header is located along Z axis. Nozzles are along Y axis. we need to calculate the nozzle displacement along z axis.

Reagrds,

Dipesh K Das

[Non-text portions of this message have been removed] Received on Fri Jul 18 05:25:00 2003