Alfa Laval Spiral Heat Exchanger SHE LTL 2S

Verify cover placement and orientation

Ensure gasket material compatibility

Place gasket and cover in position

Apply and finger-tighten hookbolts

Tighten hookbolts diagonally using recommended torque

Enter the actual working pressure

Calculate torque using formula: Torque @ 125 psig x (Actual Work Pressure / 125 PSIG)

Retighten hookbolt assemblies in a diagonally opposite sequence

Check recommended torque values in the reassembly section

Admit the cooler of the two media to the SHE first

Is the fluid nearest ambient temperature admitted first?

Start-up carried out smoothly and slowly

Start pumps against closed valves

Ensure all pipework and the SHE are filled before opening valves fully

Ensure complete reassembly of the SHE before testing

Decide if testing one side of the unit before assembling the cover(s) on the other side is desired

If testing one side, ensure the exposed face of the SHE body is held down by a rigid beam or other device

Verify that the beam is held down by the hookbolts with a weld bead as shown in the diagram

Confirm the maximum test pressure is 1.5 times the maximum allowable working pressure (MAWP)

Consult Alfa Laval if hydrostatic testing is not practical and air testing is considered

Examine channels for the following issues

Is an optical device required for inspection?

Is there any massive corrosion or erosion evident?

Is there any mechanical damage suspected?

Describe any fouling observed, especially in vertical units

Contact Alfa Laval if massive corrosion, erosion, or mechanical damage is evident or suspected

Select the cleaning method used

Ensure pipework is provided with valved branches for cleaning agents circulation

Are the cleaning agents compatible with the materials of construction?

Use proprietary cleaning agents according to manufacturers' instructions

Provide specific cleaning instructions if available

Flush the unit completely of all cleaning agents

Is the unit drained if not put back into operation immediately?