Flowserve Mark 3 Sealed Metallic Durco - Manual (Page 17)

MARK 3 USER INSTRUCTIONS ENGLISH 71569102 01-13
Page 17 of 72 flowserve.com
3.4.3 Suction pressure limits
The suction pressure limits for Mark 3 pumps with
reverse vane impellers is limited by the values given
in figure 3-6 and by the P-T ratings.
Suction pressure for pump sizes 10x8-14, 8x6-16A,
10x8-16, 10x8-16H, and 12x10-18HD (up through 2.0
specific gravity) are limited only by the P-T ratings.
Suction pressure for pumps with open impellers are
also limited only by the P-T ratings.
The suction pressure limits for Sealmatic pumps
are determined by the repeller head capability
found in Bulletin P-18-102e.
Figure 3-6A: Suction pressure limits 1750 r/min
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
0.4 0.8 1.2 1.6 2 2.4
Specific Gravity
M
a
x
im
u
m
A
ll
o
w
a
b
le
S
u
c
ti
o
n
P
re
s
s
u
re
-
b
a
r
0
40
80
120
160
200
240
280
320
360
400
M
a
x
im
u
m
A
ll
o
w
a
b
le
S
u
c
ti
o
n
P
re
s
s
u
re
-
p
s
i
11
5
7
8
6
4
1
3
2
9
10
Figure 3-6B: Suction pressure limits 3500 r/min
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
0.4 0.8 1.2 1.6 2 2.4
Specific Gravity
Ma
x
im
u
m
A
ll
o
w
a
b
le
S
u
c
ti
o
n
P
re
s
s
u
re
-
b
a
r
0
40
80
120
160
200
240
280
320
360
400
Ma
x
im
u
m
A
ll
o
w
a
b
le
S
u
c
ti
o
n
P
re
s
s
u
re
-
p
s
i
4 2 6 5
10
3
1
13
14
12
9 8 7
11
15
16
18
17