KINNEY KLRC125, Руководство оператора

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3
01
Introduction
Manual 4804 Rev E p/n 004804 0000
PROPERTIES OF SEALANTS
Water is the most commonly used sealant in liquid
ring vacuum pumps. Other fluids may be used to
obtain process compatibility. In these applications,
give special consideration to the properties of the
sealant, which may affect pump performance.
Some of the sealant properties to consider are:
• Specific Gravity
• Specific Heat
• Viscosity
• Vapor Pressure
Additionally, the solubility of process gas in
the sealant can be significant and should be
evaluated, especially if the partial or full recovery
system is used. When water is the sealant, its
chemical content should be evaluated since
certain conditions will affect the service life of the
pump. Generally, if water is suitable to drink it is
suitable for pump use. Hardness greater than 500
PPM will result in internal plating and fouling of
pump parts. Service with hardness of less than
500 PPM depends upon operating temperature
and the nature of the mineral deposit. Naturally
occurring well water with organic acid of pH5 or
higher is generally suitable; however, pH of 7 or
higher is preferred. Chemically treated water with
sulfur content requires pH7 or higher. Water that
has a pH less than 5 should be treated or the
pump should have special construction materials.
If internal scaling affects performance, consult a
water treatment specialist. Kinney recommends
that sealants and sealant systems be carefully
evaluated. Consult your Kinney sales professional
or our application engineers to discuss options.
SEALANT TEMPERATURE
Table 1-1 – Vapor Pressure of Water
Water Sealant
Temperature (°F)
Vapor Pressure
(Torr)
50 9.2
52 9.9
54 10.7
56 11.5
58 12.3
60 13.3
62 14.2
64 15.3
66 16.4
68 17.5
70 18.8
72 20.1
74 21.5
76 22.9
78 24.5
80 26.2
The rated capacity (actual cubic feet per minute
[ACFM]) of a pump is based on the use of
incoming seal water at 60°F (16°C). Seal water
temperature affects pump capacity. Table 1-1
provides data which, when applied to the following
formula, will give the pumping capacity on dry
air at water temperature other than 60°F (16°C).
To calculate pumping capacity (ACFM) or to
approximate the capacity when using water at
temperatures other than 60°F (16°C), the following
formulas apply.
S
a
= S
60
× (P
1
- P
c
) / (P
1
- 13.3)
Where: S
a
= Actual capacity in ACFM, at P
1
S
60
= Pump capacity with 60°F (16°C) sealant at P
1
(This data is shown on Data Sheet 4703.)
P
1
= Inlet pressure in Torr
P
c
= Vapor pressure of sealant at actual sealant temperature