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General specifications
Here are some tips and requirements for good maintenance of the pressurized assembly.
Use original spare parts.
Replace the gaskets whenever a joint is disassembled.
Carry out regular cleaning needed for your system.
Carry out periodic checks on all control and safety devices.
Follow the instructions in the paragraphs above.
Follow the torque specifications of the heads according to the rules set out below.
Torque and tightening sequence of head bolts
Screw type [UNI]
Tightening type
M12
not lubricate
M16
not lubricate
M18
not lubricate
M20
not lubricate
NB: Tighten the screw equally in the sequence of 30, 60, 100% of final torque to prevent uncorrect gasket deformation
NB: At start-up, it is necessary to tighten all braces on all flanged joints with interposed gasket after ordinary or extraordinary
maintenance in order to avoid coupling issues on flanged parts.
Gasket Material
8.8
10.9
ELASTOMER
86
127
ELASTOMER
214
314
ELASTOMER
306
435
ELASTOMER
432
615
Fig. 4 - Bolt tightening sequence
GB
- 32
Materiale / Momenti di serraggio N*m
12.9
42CrMo4
148
98
368
244
509
349
719
493
A193B7
97
242
346
489
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