Seal operating limits
Xylem’s proprietary mechanical seals are designed specifically for the e-XC product line.
Therefore, seals are rated against the pump’s total working pressure. The table below
outlines the operating limits of both mechanical and packing seal configurations. For
more mechanical seal and packing details, view the ‘e-XC Performance Curves and
Technical Data’ brochure.
As a general rule of thumb, the pressure the mechanical seal experiences is 1.15 times the
suction pressure of the pump in water applications. For fluids with greater viscosities, this
multiplier is greater. Consult factory for more specific information. Allowable pump
suction pressure is equal to the maximum working pressure minus the discharge pressure.
Note that the life of a mechanical seal depends on the cleanliness of the pumped fluid.
Due to the diversity of operating conditions, it is not possible to provide a definitive
guarantee of seal life. In clean water applications, typical mechanical seal life spans two to
three years.
Table 1: Operating limits
Seal Name Description Max Pressure
psi [bar]
Max Temperature
°F [°C]
MR1 Metric metal pusher 450 [31]
250 [121]
MR2 Metric rubber bellow 232 [16]
MR3 Imperial metal pusher 450 [31]
MR4 Imperial rubber bellow 175 [12]
MR5 Metric cartridge on shaft 450 [31]
MR6 Imperial cartridge on shaft 450 [31]
MR7 Metric cartridge on sleeve 450 [31]
MR8 Imperial cartridge on sleeve 450 [31]
Packing Style 608D graphite 300 [20.7]
3.3 Nameplate rating information
e-XC pumps are designated by a series of numbers. The pump nameplate gives
identification and rating information.
Permanent records for this pump are referenced by the serial number. This number must
be used with all correspondence and spare parts orders.
1 532 4
6
7
8
9
10
11
12
13
14
15
16
17
Figure 2: Rating plate
Legend
3 Product Description
e-XC INSTRUCTION MANUAL 11
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