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Series
2.15
INSTRUCTIONS
November 2013
Page
ISO
G
COPYRIGHT © SULZER PUMPS FINLAND OY
ORIGINAL INSTRUCTION
USER'S MANUAL – AHLSTAR
Installation at the site
3 Sealing
unit
3.1 Auxiliary piping
Piping for shaft seal
In order to ensure trouble-free operation of the shaft seal, it must be provided with sealing, flushing or cooling liquid
in certain applications in accordance with the sectional drawing and the parts list. The nominal sizes of the
connections are also given in the parts list and dimensional drawing of the pump.
The nominal pressure of the sealing liquid must be as high as the nominal pressure of the pump, and its maximum
temperature must be as high as the maximum permitted temperature of the pump.
The sealing water equipment is installed in the pump. In certain sealing systems, the sealing liquid equipment
contains a back-pressure valve; see sectional drawing.
Clean the sealing liquid piping carefully before installation and commissioning.
The reservoir of the seal pot sealing water equipment must be installed in a vertical position at least 500 mm above
the center line of the shaft seal. Install the pipes as short as possible so that the shaft seal is at the lowest point.
Piping for degassing in a gas separator (-GM, -GS)
The piping for degassing is connected to the degassing outlet (C50.21) of the pump. The degassing outlet is on the
right-hand side when seen from the drive. The precise size and direction of the connection are shown in the
dimensional drawing.
If a separate degassing pump (vacuum pump) is used, there is also a separate vacuum relief valve.
The size of the degassing pipe is determined by the amount of gas, the length of the pipe, the risk of clogging, etc.
The pipe size generally suitable is shown in Table 2.
Table 2, Suitable pipe sizes for degassing
Sealing unit size
Outlet size C50.21
Suitable pipe size
10
Rp 1/2
DN25 or DN32
11
Rp 1
DN25 or DN32
20
Rp 1/2
DN40 or DN50
21, 22, 23
Rp 1
DN40 or DN50
31, 32, 33
Rp 1
DN40 or DN50
41, 42, 43, 44
Rp 1 1/4
DN40 or DN50
51, 52, 53, 54, 55
Rp 1 1/4
DN50 or DN65
60, 61, 62, 63
Rp 1 1/4
DN80 or DN100
Piping for degassing in an air separating pump (-R)
The piping for degassing is connected to the degassing outlet (C50.21) of the pump, Fig. 6. The degassing outlet
can be on the left or right side of the pump depending on the design alternative, Fig. 6. The precise size and
direction of the connection are shown in the dimensional drawing.