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Welcome to Alfa Laval Welded Heat Exchangers Help Center
What is the recommended tightening sequence for the bolts?
The tightening must be done in several steps:
step 1: 50% of the rated torque,
step 2: 75% of the rated torque,
step 3: 100% of rated torque.
You can also apply ASME PCC-1 – Guidelines for Pressure Boundary Bolted Flange Joint Assembly – which describes different tightening sequence options that may be applied.
See the user manual alfa-laval-spiral-instruction-manual-en.pdf for more details.