Armstrong 4302 Series User manual

Series 4302 & 4382
dualARM Vertical In-Line Pumps
FILE NO: 43d.12
DATE: jan 05, 2012
SUPERSEDES: 43d.12
DATE: feb. 10, 2011

• Armstrong Vertical In-Line pump, the best design for hvac
systems, introduced in 1969.
• Armstrong dualARM Vertical In-Line pump, introduced in 1994.
• dualARM Series 4302 & 4382 contain all the features and
advantages of two Armstrong time proven Vertical In-Line pumps,
in one casing.
Floor Space Value:
In a typical system, for example 1000 USgpm flow at 50 ft head (63.1 L/s at 15.2 m), the dualARM needs only one quarter of the space
required for two end suction base mounted pumps and one eighth the space required for two split case horizontal pumps.
Installation Value:
Vertical In-Line pumps become an integral component of the piping system. This configuration eliminates the need for flexible
connectors, inertia bases, grouting and field alignment.
Maintenance Value:
Mechanical seals require the greatest amount of maintenance in any pump. Service is performed on any Vertical In-Line pump without
removing the casing from the piping. The Series 4302 split-spacer coupling design allows the mechanical seals to be serviced without
disturbing the pump or motor connections.
System Value:
Standby and parallel pump systems may now be designed using only one pump piping set. Two pumps in a single large port casing
allow both pumps to operate simultaneously, in true parallel fashion, with no loss in single pump efficiency.
Design Value:
dualARM Vertical In-Line pumps, designed with a swing split-flapper valve in the discharge port, prevent liquid recirculating when only
one pump is operating. Unique Armstrong isolation valves allow one pump to be isolated and removed for service while the second
pump remains in operation.
Adding Value to Hydronic Systems
Series 4302 , shown with one guard removed to reveal outside balanced
seal, and a cutaway to show the isolation valve.
Smart pumps
for the
commercial
hvac market.
Series 4302 & 4382

dualARM Vertical In-Line Pumps
1Motor: Industry standard, designed for in-line service.
2Motor shaft: Run-out limited to 0.001" (0.03 mm) tir (Total
Indicated Reading).
3Coupling: Axially split type spacer permits removal of seal
without disturbing pump or motor.
4Shaft: Stainless Steel with deflection at mechanical seal limited
to 0.002" (0.05 mm) tir.
5Mechanical seal: Outside balanced or inside type, accessible
and easily replaced.
6Seal plate: Flush connection ensures lubrication at the seal faces
and positive venting of seal chamber.
7Impeller: Dynamically balanced to ensure smooth vibration-free
operation.
8Volute: Radially split, with equal suction and discharge flange
sizes. Separate tapped openings for gauge, flush and drain
connections.
9Gasket: Confined casing gasket to meet stringent industrial
temperature and pressure applications.
1 Flapper valve: Hydraulically isolates casings preventing
recirculation when only one pump operates.
1 Isolation valves: Allow one unit to be isolated and removed for
service with the second unit still operating.
1 Coupling guards: Fully enclose all access openings. (Not shown.)
Designed to incorporate two Armstrong standard Series 4300 split coupled Vertical In-Line pumps in a single casing. All existing 4300
series catalogue information and performance curves may be used, or doubled in the case of parallel operation, for the Series 4302 Vertical
In-Line pump.
Series 4302
1
1
1
9
6
5
1
2
3
3
87

1Motor: Industry standard, designed for in-line service.
2Flush and vent connection: - Removes entrained air ensuring
lubricating liquid is at the seal faces at all times. Piped to pump
suction.
3Mechanical seal: - Inside type with Silicon Carbide seat,
serviceable without disturbing the pipe connections.
4Impeller: Dynamically balanced to ensure smooth vibration-free
operation.
5Volute: Radially split, with equal suction and discharge flange
sizes. Separate tapped openings for gauge, flush and drain
connections.
6Gasket: Confined casing gasket to meet stringent industrial
temperature and pressure applications.
7Flapper valve: Hydraulically isolates casings preventing
recirculation when only one pump operates.
8Isolation valves: Allow one unit to be isolated and removed for
service while the second unit remains in operation.
Designed to incorporate two Armstrong standard Series 4380 close coupled Vertical In-Line pumps in a single casing. All existing 4380
series catalogue information and performance curves may be used, or doubled in the case of parallel operation, for the Series 4382
Vertical In-Line pump.
Series 4382
8
54
7
8
2
1
3
6

4302 Sealing Arrangements
Armstrong Series 4302 split coupled Vertical In-Line pump is available with two normal mechanical seal arrangements. Each arrangement
may be removed quickly and easily for servicing, without costly removal of the motor or rotating assembly from the pump casing. The high
performance outside seal combines the advantages of a balanced seal with premium quality. The internal mechanical seal provides an
economical alternative.
1Pump Shaft
2Rotating Hardware
3Spring(s)
4Secondary Seal
5Rotating Face
6Stationary Seat
7Gland Plate
8Throttle Bushing
7
8
6
4
3
2
1
5
Outside Balanced Mechanical
Seal Arrangement
7
8
6
4
3
2
1
5
Inside Unbalanced Mechanical
Seal Arrangement
4382 Sealing Arrangements
dualARM Pressure/Temperature Parameters
temperature °f(°c)
pressure psig (bar)
0
(-18)
(0) 0
(3.45) 50
(10.34) 150
(13.79) 200
(17.24) 250
(20.00) 300
(6.90) 100
50
(10)
250
(121)
200
(93)
150
(66)
100
(38)
a
b
1Motor Shaft
2Shaft Sleeve
3 Stationary Seat
4 Secondary Seal
5Rotating Face
6 Spring
7Rotating Hardware
Armstrong Series 4382 close coupled Vertical In-Line pump is supplied with an economical internal single spring unbalanced mechanical
seal. The seal is serviced by removing the rotating element from the casing. The pump casing typically remains in the piping.
legend
a4302 & 4382 bf
b4302 & 4382 dbf
notes: For clean untreated water. For pumping temperatures above 200°f,
longer mechanical seal life can be achieved on Series 4302 if flushing
liquid is cooled by an external heat exchanger to maintain seal flush
water below 200°f.
dualARM Vertical In-Line Pumps
All seals supplied with Silicon carbide seats.
1
2
3
4
4
5
6
7

Armstrong dualARM Vertical In-Line pumps, when installed with Armstrong Suction Guides 1and Armstrong Flo-Trex combination valves
2, result in the greatest added value and lowest life cycle cost of any equipment that can be designed into today’s commercial, industrial,
hvac and packaged systems.
1 The Armstrong Suction Guide, designed with flow stabilizing
plates in the outlet port, allows the guide to be bolted directly
onto the pumpsuction flange, enabling the vertical piping to
turn 90° into the pump. A disposable fine mesh start-up
strainer and permanent perforated stainless steel strainer
complete this valuable fitting.
The Suction Guide eliminates the need for a separate suction
strainer, long radius elbow and minimum straight pipe run to
the pump suction.
2 The Armstrong Flo-Trex triple function combination valve is
designed to operate equally as a non-slam check valve, drip
tight isolation valve and properly designed throttling valve. The
throttling feature enables a system head increase to operate
the pump at design conditions. The Armstrong uniquely
designed valve is field convertible from 90° angle type to 180°
straight type.
The Flo-Trex combination valve eliminates the need for a
discharge elbow, a separate check valve and a throttling type
isolation valve.
1armstrong
suction guide
armstrong dualARM
vertical in-line pump
2 armstrong flo-trex
combination valve
Armstrongest System Value

Series 4302 Split Coupled
Vertical In-Line Pump
Series 4382 Close Coupled
Vertical In-Line Pump
Typical Specifications
Supply and install as shown on the plans and specifications,
Armstrong Series 4302 dualARM split coupled Vertical In-Line
centrifugal pumping unit. The cast casing with equal size suction
and discharge flanges, having separate tapped flush line and
pressure gauge connections, shall incorporate two radially split,
single stage centrifugal pumps. Each pump shall have a cast bronze
dynamically balanced impeller, stainless steel shaft, lower seal flush
throttle bushing, outside balanced mechanical seal with stainless
steel parts, Viton secondary seal, carbon vs silicone carbide faces
and stainless steel gland plate and hardware. Each pump shall be
fitted with a factory furnished flush line to the mechanical seal. The
flush line is to be fitted with a manual air vent.
Each driving motor shall be an industry standard vertical solid
shaft, squirrel cage induction type, built to nema standards(motor
efficiency levels may be specified). The motor shall have
enclosure and be suitable for a Hz, Phase,
Volt power supply and shall be connected to the pump by means
of a rigid split type spacer coupling that permits removal of the
mechanical seal without disturbing the pump or motor connections.
The inlet and outlet ports on the casing shall be at least one size
larger than the single pump size, so that both units may operate
in parallel with no loss of single pump efficiency. Each port shall
be fitted with an isolation valve that allows the units to operate in
parallel or standby. It may also be used to isolate one pumping unit
for servicing or removal, while the other pump remains operating.
Flush line option:
Supply in the flush line to the mechanical seal a 50 micron cartridge
type filter (if the differential pressure exceeds 30 psig [2bars], a
Cyclone separator may be specified) and a sight flow indicator. The
mechanical contractor shall change the filter cartridge after the
system has been flushed and on a regular basis thereafter, until the
building is turned over to the owner.
Supply and install as shown on the plans and specifications,
Armstrong Series 4382 dualARM close coupled type Vertical In
-Line centrifugal pumping unit. The cast casing with equal size
suction and discharge flanges, having separate tapped flush line
and pressure gauge connections, shall incorporate two radially
split, single stage centrifugal pumps. Each pump shall have a
cast bronze dynamically balanced impeller, bronze shaft sleeve
and inside type single spring mechanical seal with carbon* vs
silicone carbide faces. Each pump shall be complete with a factory
furnished flush and vent line.
Each driving motor shall be an industry standard vertical solid
shaft, squirrel cage induction type, built to nema standards(motor
efficiency levels may be specified). The motor shall have
enclosure and be suitable for a Hz, Phase,
Volt power supply. The inlet and outlet ports on
the casing shall be at least one size larger than the single pump
size, so that both units may operate in parallel with no loss of
single pump efficiency. Each port shall be fitted with an isolation
valve that allows the units to operate in parallel or standby. It may
also be used to isolate one pumping unit for servicing or removal,
while the other pump remains operating.
* For liquids above 200°f / 93°c use: antimony loaded carbon
For Glycols greater than 30% by wt use: silicon carbide

For Armstrong locations worldwide, please visit www.armstrongintegrated.com
© s. a. armstrong limited 2012
s. a. armstrong limited
23 Bertrand Avenue
Toronto, Ontario
Canada, m1l 2p3
t416 755 2291
f416 759 9101
armstrong pumps inc.
93 East Avenue
North Tonawanda, New York
U.S.A., 14120-6594
t716 693 8813
f716 693 8970
armstrong integrated limited
Wenlock Way
Manchester
United Kingdom, m12 5jl
t+44 (0) 8444 145 145
f+44 (0) 8444 145 146