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Page Title:
Table IV. Approximate maximum impeller diameter. |
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|  MIL-P-17840C(SH)
3.3.5.3 I-repellers shall not be furnished with wearing rings. The
impeller wearing surfaces shall have material thickness to permit reducing the
diameter of the impeller wearing surfaces by as much as 0.050 inch to accommo-
date undersize casing wearing rings to restore design running clearance.
3.3.5.4 The impeller shall have the approximate maximum diameter for each
pump as specified in table IV.
TABLE IV.
Approximate maximum impeller diameter.
Approximate maximum
Approximate maximum
impeller diameter
Pump
impeller diameter
Pump
number
(inches)
number
(inches)
7-1/2
1C
5
10C
9
11C
6-3/4
2C
l2c
3C
9-3/4
5
13C
10-1/2
4C
6-1/4
14C
8
5-1/8
5C
15C
7
5-1/4
6C
16C
7C
10
9
17C
10-1/2
9-1/4
8C
----
---
9-1/4
9C
3.3.5.5 All rotors shall be dynamically balanced with all rotating parts
connected thereto. This requires dynamic balance with the rotating elements of
the driving unit in place; however, rotating parts may be balanced individually
provided that when assembled the unbalance shall not exceed the limits specified
in MIL-STD-167-1.
3.3.6 Shafts.
3.3.6.1 Shaft flingers shall be provided adjacent to stuffing boxes for
the pumps.
3.3.6.2 Shafts shall be made of nickel-copper or nickel-copper-aluminum
alloy, one-piece construction.
3.3.6.3 Shaft sleeves shall have the dimensions shown on figure 8 (see
3.3.7) and shall suit the mechanical seal.
3.3.6.4 O-ring seals shall be used between the shaft and stuffing box
shaft sleeve. Other positive methods of sealing may be used subject to the
approval of the design review agency.
3.3.7 Stuffing boxes and mechanical shaft seals.
3.3.7.1 All pumps shall be provided with mechanical shaft seals. Magnetic
type seals shall not be used.
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