Man L23/30DF, Project Manual

Page: 329 / 392

Description
On resilient mounted generating sets, the diesel
engine and the alternator are placed on a common
rigid base frame mounted on e.g. concrete founda-
tion by means of resilient supports, Sandwich
Mounting.
All connections from the generating set to the exter-
nal systems should be equipped with flexible con-
nections, and pipes, gangway etc. must not be wel-
ded to the external part of the installation.
Resilient support
A resilient mounting of the generating set is made
with a number of sandwich mountings. The number
and the distance between them depend on the size
of the GenSet. The mountings are bolted onto the
base frame
(See method of fixing on page 4).
The standard height of the sandwich mountings is
125 mm in unloaded condition – when loaded the
setting is normally 6-8 mm.
The exact setting can be found in the calculation of
the sandwich mountings for the plant in question.
Check of crankshaft deflection
The resilient mounted generating set is normally
delivered from the factory with engine and alternator
mounted on the common base frame.
Even though engine and alternator have been
adjusted by the engine builder, with the alternator
rotor placed correctly in the stator and the crank-
shaft deflection of the engine (autolog) within the
prescribed tolerances, it is recommended to check
the crankshaft deflection (autolog) before starting up
the GenSet.
Concrete foundation
The engine concrete foundation shall be in accord-
ance with the foundation drawing from MAN Diesel
& Turbo.
The dimension and the reinforcement of the con-
crete foundation are based on soil condition ≥ 60
kN/m
2
. If this requirement can not be fulfilled it is up
to the customer to improve the soil condition.
The casting of the engine foundation shall be exe-
cuted continuously, and no construction joints shall
be permitted.
Mounting of base plates on concrete
foundation
Before the foundation base plates are placed on the
concrete foundation, they have to be machined
according to the drawing from MAN Diesel & Turbo
and meet the tolerances as shown in the table on
page 5.
Place and align the base plates in the openings of
the concrete foundation according to the drawing
from MAN Diesel & Turbo. Mark the positions of the
foundation bolts through the holes in the base
plates. Remove the base plates and drill the holes
for the foundation bolts with conventional tools. The
holes have to be drilled according to recommenda-
tions from the supplier of the foundation bolts.
Install the foundation bolts according to recommen-
dation from the supplier.
Place and align the base plates in the openings of
the concrete foundation again.
Pre-tighten the foundation bolts with a torque of 20
Nm.
Fill-up the openings in the concrete foundation with
nonshrinking grouting material such as MasterFlow
870 Grout or Supaflow TM HF Grout or similar.
Tighten up the foundation bolts with a torque of 110
Nm, after hardening of the grouting material.
This method of fixing the base plates is suitable for
earthquake conditions up to 7 on the Richter scale
(If higher conditions is required, please contact
MAN Diesel & Turbo).
Mounting and adjustment instructions for
new generating sets
1) In case the sandwich mountings have not been
mounted in the factory, they have to be moun-
ted at the location on the base frame by means
of four M16 bolts each, see page 4.
2) Fit the filling pieces to the sandwich mountings
by means of four M16 bolt each,
see page 4.
The filling pieces have to be machined accord-
ing to the drawing from MAN Diesel & Turbo.
3) Align the generating set above the base plates
according to the drawing from MAN Diesel &
Turbo.
4) Lower the generating set until it rests com-
pletely on the base plates.
MAN Diesel & Turbo
1699989-9.5
Page 1 (5)
Resilient mounting system for landbased generating
sets
B 20 00 0
L27/38S, L21/31S, L16/24S
2015.05.11