amiad Omega 13.5K, Руководство по установке и эксплуатации

Страница: 86 / 93

O M EG A F i l t e r s – I n s t a l la t io n & O p e r a t io n M a n u a l P a g e 3 5 o f 3 6
Maintenance
Controlled Tightening/ Loosening of Lid nuts
k. Controlled Tightening/ Loosening of Lid nuts
Tightening
The nuts of all bolts shall be installed finger tight, followed by gradually increasing the bolt force to the
required value in minimum 4 passes as described in Table 3. The bolt sequence shall be in
accordance with the given bolt sequence chart on Figure 34.
The first pass may be done with a hand-spanner, without torque control.
pass 1 pass 2 pass 3 pass 4 pass 5
30% 60% 100% 100% 100%
140 270 440 440 440
Table 3 - Bolting up torque in Nm
Pass 4 shall be in circumferential pattern and be repeated until the nuts do not move;
Pass 5 (optional) time permitting, wait minimum of 4 hrs and repeat Pass 4; this will restore short term
relaxation at ambient conditions.
Loosening
To prevent over yielding of the bolts during dismantling, loosening of the individual bolts shall be done in
a minimum of two passes (50%, 0%) following the given bolt sequence.
Figure 34 – bolt sequence chart
l. BOLTS TIGHTENING
:
All bolts, unless otherwise specified, should be
tightened according to the following Torques
Table:
TORQUE TABLE
Bolt Size N-M Lbs-ft
M6 / 1/4”
8 6
M8 / 5/16” 20 15
M10 / 3/8” 40 30
M12 / 1/2" 81 60
M16 / 5/8” 176 130
M20 / 3/4" 340 250
M24 / 1” 680 500
M27 880 650
1-1/2” 1370 1012
20 Bolt Lid
24 Bolt Lid