Flowserve Mark 3 Sealed Metallic Durco - Manual (Page 12)

MARK 3 USER INSTRUCTIONS ENGLISH 71569102 01-13
Page 12 of 72 flowserve.com
3 DESCRIPTION
3.1 Configurations
The Durco Mark 3 chemical process pumps are
metallic , single stage, sealed, centrifugal pumps.
The horizontal family conforms to ASME B73.1M,
which has a centerline discharge and is represented
by our Standard, Sealmatic, Unitized self-priming,
Recessed impeller and Lo-Flo pump models. The
vertical pump or In-Line conforms to ASME B73.2M.
The Prima
3 TM
is an ANSI 3A power end adapted to
other pump models from Flowserve as well as from
other pump manufacturers. Only the information in this
manual involving the ANSI 3A power end may be used
when Installing, Operating or Maintaining a pump that
has been upgraded to a Prima
3 TM
. All other information
regarding the pump type must be obtained from the
original pump manufacturer's User Instructions.
3.2 Nomenclature
The pump size will be engraved on the nameplate
typically as below:
2 K 6 X 4 M - 13 A /12.5 RV
•
Frame size
“2" indicates a medium size pump frame (in this
example, a Group 2)
1 = Group 1 (small frame)
2 = Group 2 (medium frame)
3 = Group 3 (large frame)
•
Power end
K = Mark 3 style power end
Mark 3A – Standard
ANSI 3A – Optional (3 year guarantee)
J = Mark 3 style PE arranged for Mark 2 wet end
(No letter and no preceding number indicates
a Mark 2 power end)
HD = Heavy Duty variant of the Mark 3 power end
(suffix)
•
“6” = nominal suction port size (in.)
•
“4” = Nominal discharge port size (in.)
•
Modifier for “specialty pumps”
Blank or no letter = standard pump
M = Sealmatic
R = recessed impeller
US = unitized self-priming
V = vertical In-Line
LF = Lo-Flo
•
Nominal maximum impeller diameter. “13” = 13 in.
•
Pump design variation
A = This pump has been redesigned from an earlier
version. The impeller and casing are no longer
interchangeable with the earlier version.
H = This pump is designed for a higher flow capacity
than another pump with the same basic
designation. (Examples: 4X3-10 and 4X3-10H;
6X4-10 and 6X4-10H; 10X8-16 and 10X8-16H.
HH = This pump is designed for a higher head than
another pump with the same basic designation.
(Example: 4X3-13 and 4X3-13HH.)
•
Actual impeller size
“12.5” = 12 ½ in. diameter; 8.13 = 8
⅛ in.;
10.75 = 10 ¾ in.
(Previous annotation: 124 = 12
4
/
8
or 12 ½ in.
diameter; 83 = 8 ⅜ in.)
•
Impeller style
RV = reverse vane impeller; OP = Open impeller
3.3 Design of major parts
3.3.1 Pump casing
Removal of the casing is not required when performing
maintenance of the rotating element. The pump is
designed with a gasket perpendicular to the shaft
allowing the rotating element to be easily removed
(back pull out).
3.3.2 Impeller
Depending on the product, the impeller is either reverse
vane or open.
3.3.3 Shaft/sleeve
Solid and sleeved shafts are available, supported on
bearings, threaded impeller end and keyed drive end.
3.3.4 Pump bearings and lubrication
Ball bearings are fitted as standard and may be either
oil or grease lubricated.
3.3.5 Bearing housing
Large oil bath reservoir.
3.3.6 Seal chamber (cover plate)
The seal chamber has a spigot (rabbet) fit between
the pump casing and bearing housing (adapter) for
Figure 3-1: Nameplate mounted to housing
Serial No.
Equipment No.
Purchase Order
Model
Size
MDP
Material
Date DD/MMM/YY
2K6X4 M-13A/12.5 RV