Emerson Vilter VSG128, Инструкция по установке, эксплуатации и обслуживанию

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Section 3 • Installation
HPLD Single Screw Compressor •Installation, Operation and Service Manual • Emerson • 35391HP
Piping
• Before installing piping, the compressor inlet and
outlet ports should be inspected to ensure no dirt
is present.
• Piping should be supported so that no piping loads
are transmitted to the compressor casings.
• All piping should be inspected for cleanliness
before installation. As each pipe is connected to
the compressor, the coupling alignment should be
checked to ensure that no alteration has taken place.
• If alignment has altered, the compressor is being
strained and the piping supports must be adjusted.
• It is not sufficient merely to re-align the drive
coupling, as this will not correct the cause of the
strain.
• Care must be taken to avoid trapping the lines
except for specific purposes. When traps are used,
the horizontal dimensions should be as short as
possible to avoid excessive oil trapping.
• Steel pipe is generally used in large installations
when joints are welded.
In making up joints for steel pipe, the following
procedures should be followed:
• For threaded connections, all threads on the pipe
and fitting should be carefully cleaned to remove
all traces of grease or oil. Threads should then be
wiped dry with a lintless cloth. Only thread filling
compounds suitable for service should be used for
making steel pipe joints. These compounds should
be used sparingly, and on the pipe only. Do not put
any on the first two threads to prevent any of the
thread sealing compound from entering the piping
system. Acetylene or arc welding is frequently used
in making steel pipe joints, however, only a skilled
welder should attempt this kind of work. Take care
to see no foreign materials are left in the pipes and
remove all burrs formed when cutting pipe.
• For halocarbon piping, only wrought copper fittings
should be used. Cast fittings as used for water service
are porous and will allow the refrigerant to escape.
Note this exception: In larger pipe sizes, wrought
fittings are not available. However, specially tested
cast fittings are available and these may be used
with complete safety.
• It is important to avoid short, rigid pipe lines that do
not allow any degree of flexibility. This must be done
to prevent vibration being transmitted through the
pipe lines to the buildings. One method of providing
the needed flexibility to absorb the vibration is to
provide long lines that are broken by 90° Ells in three
directions.
• A second method would be to install flexible pipe
couplings as close to the compressor unit as possible
with connections run in two different directions,
90° apart. These flexible connections should be
installed on both the high and low side lines of the
compressor unit.
• Hangers and supports for coils and pipe lines
should receive careful attention. During prolonged
operation of the coils, they may become coated
with ice and frost, adding extra weight to the coil
The hangers must have ample strength and be
securely anchored to withstand the vibration from
the compressor and adequately support the pipe
lines.
• For CO
2
piping, the pipes can have smaller diameters
and they will require a greater thickness to withstand
the higher pressures.
This information is taken from ANSI B31.3. The installing
contractor should be thoroughly familiar with these
codes, as well as any local codes.
NOTE
Refer to ANSI/ASME B31.5 Codes for Refrigeration
Piping.
CAUTION
Accumulated liquid in the suction header can damage
the compressor if not drained. Always drain headers
(suction and discharge headers) prior to start-ups.
Failure to comply may result in damage to equipment.