Goulds NPO Installation guide

NPO
OPEN IMPELLER ALL STAINLESS STEEL END SUCTION PUMPS
PRODUCT TRAINING MANUAL
TRAINING MANUAL
NPOTM

PAGE 2
Commercial Water
Goulds Water Technology
NPO PRODUCT INTRODUCTION
WASHER SERVICE
APPLICATIONS
WASHER SERVICE
APPLICATIONS

PAGE 3
Commercial Water
Goulds Water Technology
TABLE OF CONTENTS
Introduction ............................................................................................................................................................................... 4
Product Overview ..................................................................................................................................................................... 6
Major Components ................................................................................................................................................................... 7
NPO Product Line Numbering System ................................................................................................................................... 8
Common NPO Catalog Models .............................................................................................................................................. 9
Components and Materials of Construction .......................................................................................................................10
Performance ............................................................................................................................................................................11
Dishwasher Market - Primary Applications ..........................................................................................................................15
— Chemical Companies ..............................................................................................................................................16
— Restaurant Supply ....................................................................................................................................................16
— Typical Dishwasher Design .....................................................................................................................................17
Commercial Laundry .............................................................................................................................................................18
Parts Washers ..........................................................................................................................................................................19
Machine Tool Coolant ............................................................................................................................................................20
Competition
— Advantages of the NPO Over Flowserve (IDP) ....................................................................................................21
— Commercial Laundry ...............................................................................................................................................21
— Parts Washer and Machine Tool .............................................................................................................................21
Installation Procedures ...........................................................................................................................................................22
Service and Maintenance Procedures ..................................................................................................................................24
Troubleshooting ......................................................................................................................................................................26

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Commercial Water
Goulds Water Technology
INTRODUCTION
This manual is designed to teach you, the Goulds Water Technology distributor, about the NPO end-suction open
impeller pump. If you are a salesman, serviceman, technician, application engineer or even the owner at a Goulds
Water Technology distributorship, this manual is for you. It is not intended for the pump purchaser or user.
In this manual, you will find detailed information on product specifications and capabilities, where to sell it, how
to install it and how to repair it. This is meant to supplement the introduction meeting held by your Goulds Water
Technology factory representative, and to be a permanent reference source. In this way, it can be used as an in-
depth backup to your Goulds Water Technology catalog materials.
Why the NPO?
The NPO (or open impeller NPE) was developed as a result of Goulds Water Technology experience with the
commercial dishwasher market. In addition, it builds on the strength of our NPE market presence and allows us to
enter other high volume markets where small solids or particulate handling is required. The exclusive Goulds Water
Technology fabricated stainless design also offers considerable advantages over our major competitors in these
markets.
What is the Market Size?
The U.S. market for commercial dishwashers is approximately 20,000 units per year. In addition, commercial
laundry systems account for another 3,000 systems with up to ten pumps per line. NPO applications in parts
washing, particulate and machine tool markets add another 15,000 units per year. Similar applications exist around
the world.

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Commercial Water
Goulds Water Technology
INTRODUCTION
What is the Performance Coverage?
The NPO performance range is from 10 to 80 GPM at 250 to 110 feet of head. This fits the requirements of most
small spray washer systems such as commercial dishwashers.
CAPACITY Q
METERS FEET
TOTAL DYNAMIC HEAD
H
0
120
100
80
60
40
20
30
20
10
0025 50 75 100 125 150 175 U.S. GPM
0510 15 20 25 30 50 m
3/hr
200 225 250
454035
25
15
5
1" x 1
1⁄4" – 6
3500 RPM 11⁄4" x 11⁄2" – 6
3500 RPM
11⁄2" x 2" – 6
3500 RPM
1" x 11⁄4" – 6
1750 RPM 11⁄4" x 11⁄2" – 6
1750 RPM
11⁄2" x 2" – 6
1750 RPM

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Commercial Water
Goulds Water Technology
PRODUCT OVERVIEW
The NPO pump from Goulds Water Technology is an open impeller, single stage, end suction centrifugal made of
316 stainless steel for a variety of commercial washing applications
It consists of three pump sizes using 1⁄2-71⁄2HP motors in a variety of enclosures. Many of the options for the NPE
including seals and the vent/flush accessory are also available for the NPO.
The casing is a modification of the NPE casing which incorporates a flat running surface for the front of the open
impeller. The impeller for the smalles size is a cast 316 open design similar to that used in the ICS. Impellers for the
two larger sizes are fabricated 316L. The seal housing and seal are identical to those used on the NPE.
CROSS SECTION OF NPO

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Commercial Water
Goulds Water Technology
MAJOR COMPONENTS
CASING: The NPO casing is 316L stainless steel with 1¼”, 1½” or 2” suction and 1”, 1¼” or 1½” discharge. Connec-
tions are centerline NPT threaded. The inner flat running surface matches the maximum impeller diameter. Vent/
prime and drain connections are fitted with stainless steel plugs.
SEAL HOUSING: The NPO seal housing is the same as that used for the NPE. It is made of 316L stainless and fea-
tures a series of formed barriers designed to keep the liquid circulating and reduce the chance of heat build up in
the seal area. The seal stationary seat fits into the opening. The seal housing also positions the casing o-ring against
the casing rim.
SEALS: John Crane, Type 21, 5⁄8” seals are used in the NPO. The standard seal is carbon/silicon-carbide/viton. Op-
tional faces are silicon-carbide vs. silicon-carbide. Optional elastomer is EPR. Metal parts are all 316 stainless steel.
Seals are interchangeable with the NPE. Casing o-rings are available to match seal elastomer options.
IMPELLER: The NPO impeller uses a semi-open design, with no front shroud. This type of impeller is capable of
passing up to 3⁄8” solids and is ideal for applications where food particles, lint, seeds or other small solids and par-
ticles are likely to be found in the pumpage. The NPO impeller is 316 stainless steel for maximum service life. It is
threaded to fit 56J motor shafts and is supplied with a front lock nut.
MOTOR ADAPTER: The NPO is supplied as standard, with a non-footed 316L stainless steel motor adapter. This
is the same motor adapter used on the frame mounted version of the NPE. This design was chosen to provide less
vibration and more mounting standardization through the use of welded motor mounting feet. Please note, how-
ever, that this version produces an interference fit, since the casing extends approximately 11⁄8” below the motor
feet. In most washing systems, the pump is mounted on framing inside the cabinet so that the liquid end is located
in open space. The footed NPE motor adapter with a non-footed motor can be ordered as an option if required.
MOTORS: The most common motor for the NPO is a single phase, ODP, 115/230 volt with a solid state switch. This
motor is available in ½ to 2 HP and is typical in most washer systems. In addition, those motors used for the ICS
including ODP, TEFC, Explosion Proof, 575 volt and three phase may also be used on the NPO. The use of NPE mo-
tors is also possible, but requires the use of the footed motor adapter.
VENT/FLUSH: The optional vent/seal flush for the NPE is also available on the NPO. This is particularly useful in
removing air bubbles which may form at the seal area during priming if the pump is mounted vertically.
FRAME MOUNTED: The NPO can be frame mounted if required by using the same bearing frame, baseplate,
coupling and T-frame motors used for the NPE.

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Commercial Water
Goulds Water Technology
NPO PRODUCT LINE NUMBERING SYSTEM
The various versions of the NPO are identified by a product code number on the pump label. This number is also
the catalog number for the pump. The meaning of each digit in the product code number is shown below.
EXAMPLE PRODUCT CODE
1 SN 2 C 1 A 4 F
Seal Vent/Flush Option
Mechanical Seal and O-ring
4 = Pre-engineered standard
For optional mechanical seal modify catalog order no. with seal code
listed below.
Impeller Option . . . No Adder Required
For optional impeller diameters modify catalog order no. with impel-
ler code listed. Select optional impeller diameter from pump perfor-
mance curve.
Driver
1 = 1 PH, ODP 4 = 1 PH, TEFC 7= 3 PH, XP
2 = 3 PH, ODP 5 = 3 PH, TEFC 8= 575 V, XP
3 = 575 V, ODP 6 = 575 V, TEFC 0= 1 PH, XP
HP Rating
C = ½ HP E = 1 HP G = 2 HP J = 5 HP
D = ¾ HP F = 1½ HP H = 3 HP K = 7½ HP
Driver: Hertz/Pole/RPM
1 = 60 Hz, 2 pole, 3500 RPM
2 = 60 Hz, 4 pole, 1750 RPM
4 = 50 Hz, 2 pole, 2900 RPM
5 = 50 Hz, 4 pole, 1450 RPM
Material
SN = Stainless steel
Pump Size
1= 1 x 1¼ – 6 2= 1¼ x 1½ – 6 3 = 1½ x 2 – 6
Impeller Pump Size
Code 1 x 1¼ – 6 1¼ x 1½ – 6 1½ x 2 – 6
Diameter Diameter Diameter
A 45⁄16 55⁄16 57⁄16
B 4 51⁄16 5¼
C 3¾ 45⁄8415⁄16
D 3½ 45⁄16 45⁄8
E 3¼ 41⁄16 47⁄16
F 3 3¾ 43⁄16
G 53⁄837⁄16 3¾
H 5 — —
For frame
mounted
version,
substitute the
letters “FRM” in
these positions.
John Crane Type 21 Mechanical Seal (5⁄8” seal)
Seal Rotary Stationary Elastomers Metal Part Casing
Code Parts No. O-Ring
2 Carbon EPR 10K18 EPR
4 Sil- Viton 316 SS 10K55 Viton
5 Sil- Carbide EPR 10K81 EPR
6 Carbide Viton 10K62 Viton

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Commercial Water
Goulds Water Technology
COMMON NPO CATALOG MODELS
GPM Head
(Feet) HP Single Phase Three Phase
ODP* TEFC ODP TEFC XP
10
37 ½ 1SN1C1D4 1SN1C4D4 1SN1C2D4 1SN1C5D4 1SN1C7D4
43 ½ 1SN1C1C4 1SN1C4C4 1SN1C2C4 1SN1C5C4 1SN1C7C4
50 ½ 1SN1C1B4 1SN1C4B4 1SN1C2B4 1SN1C5B4 1SN1C7B4
58 ¾ 1SN1D1A4 1SN1D4A4 1SN1D2A4 1SN1D5A4 1SN1D7A4
20
35 ½ 1SN1C1D4 1SN1C4D4 1SN1C2D4 1SN1C5D4 1SN1C7D4
40 ½ 1SN1C1C4 1SN1C4C4 1SN1C2C4 1SN1C5C4 1SN1C7C4
46 ¾ 1SN1D1B4 1SN1D4B4 1SN1D2B4 1SN1D5B4 1SN1D7B4
54 1 1SN1E1A4 1SN1E4A4 1SN1E2A4 1SN1E5A4 1SN1E7A4
30
32 ¾ 1SN1C1D4 1SN1C4D4 1SN1C2D4 1SN1C5D4 1SN1C7D4
37 ¾ 1SN1C1C4 1SN1C4C4 1SN1C2C4 1SN1C5C4 1SN1C7C4
43 1 1SN1E1B4 1SN1E4B4 1SN1E2B4 1SN1E5B4 1SN1E7B4
50 1½ 1SN1F1A4 1SN1F4A4 1SN1F2A4 1SN1F5A4 1SN1F7A4
40
27 1 1SN1E1D4 1SN1E4D4 1SN1E2D4 1SN1E5D4 1SN1E7D4
33 1 1SN1E1C4 1SN1E4C4 1SN1E2C4 1SN1E5C4 1SN1E7C4
38 1½ 1SN1F1B4 1SN1F4B4 1SN1F2B4 1SN1F5B4 1SN1F7B4
46 1½ 1SN1F1A4 1SN1F4A4 1SN1F2A4 1SN1F5A4 1SN1F7A4
50
24 1 1SN1E1D4 1SN1E4D4 1SN1E2D4 1SN1E5D4 1SN1E7D4
29 1½ 1SN1F1C4 1SN1F4C4 1SN1F2C4 1SN1F5C4 1SN1F7C4
35 1½ 1SN1F1B4 1SN1F4B4 1SN1F2B4 1SN1F5B4 1SN1F7B4
42 1½ 1SN1F1A4 1SN1F4A4 1SN1F2A4 1SN1F5A4 1SN1F7A4
60
20 1½ 1SN1F1D4 1SN1F4D4 1SN1F2D4 1SN1F5D4 1SN1F7D4
25 1½ 1SN1F1C4 1SN1F4C4 1SN1F2C4 1SN1F5C4 1SN1F7C4
30 1½ 1SN1F1B4 1SN1F4B4 1SN1F2B4 1SN1F5B4 1SN1F7B4
37 2 1SN1G1A4 1SN1G4A4 1SN1G2A4 1SN1G5A4 1SN1G7A4
70
16 1½ 1SN1F1D4 1SN1F4D4 1SN1F2D4 1SN1F5D4 1SN1F7D4
21 1½ 1SN1F1C4 1SN1F4C4 1SN1F2C4 1SN1F5C4 1SN1F7C4
25 1½ 1SN1F1B4 1SN1F4B4 1SN1F2B4 1SN1F5B4 1SN1F7B4
32 2 1SN1G1A4 1SN1G4A4 1SN1G2A4 1SN1G5A4 1SN1G7A4
* Single phase ODP motors have a solid state switch.

PAGE 10
Commercial Water
Goulds Water Technology
COMPONENTS AND MATERIALS OF CONSTRUCTION
GENERAL DESCRIPTION: 316 stainless steel end-suction centrifugal pump with semi-open impeller. Performance
from 10-250 GPM with 20-110 feet TDH. Maximum working pressure is 125 PSIG (9 bars). Standard liquid tempera-
tures to 212º F (100º C) with the standard seal or 250º F (121º C) with the optional high temperature seal. Solids
handling to 3⁄8”. Suction and discharge connections are NPT threaded with the suction at 1¼”, 1½” or 2” and the
discharge at 1”, 1¼” or 1½”.
COMPONENT MATERIALS OF CONSTRUCTION
Casing AISI 316L Stainless Steel
Impeller AISI 316 Stainless Steel
Motor Adapter AISI 316L Stainless Steel
Seal Housing AISI 316L Stainless Steel
Casing Socket Head Screws AISI 430 Stainless Steel
Casing O-Ring Viton
Casing Vent Plug AISI 316L Stainless Steel with Viton O-Ring
Casing Drain Plug AISI 316L Stainless Steel with Viton O-Ring
Motor Bolts Plated Steel
Deflector BUNA
Mechanical Seal Standard with Carbon vs. Silicon-Carbide, 316
Stainless Steel Metal Parts and Viton Elastomers
Impeller Lock Nut 316 Stainless Steel
MOTORS: NEMA standard 56J frame with rigid base and ball bearing design stainless steel shaft. Available enclo-
sures include open-drip proof, totally enclosed-fan cooled and explosion proof. Motors are 50/60 Hz, 3500 RPM
single phase (115/230V) or three phase (208-230/460V or 575V). Horsepowers are ½ to 7½” HP. Single phase mo-
tors have built in overload with auto reset. Three phase motors require starter and heaters which may be ordered
separately.

PAGE 11
Commercial Water
Goulds Water Technology
PERFORMANCE
The following curves show the performance of the three signs of NPO when operating at 3500 RPM.
IMPORTANT NOTE:
The NPO performance is very dependant on the clearance between the impeller and casing face plate. The curves
show the worst case performance with NPO motors. Individual pumps may produce up to 5 feet of additional TDH.
Use of other motors may result in lower performance. Contact Goulds Water Technology customer service for help
in selecting a pump for a specific OEM application.
0
20
40
60
80
0
10
20
25
6050403020100
2050
90
70
50
30
10
15
5
70 80 90
1510
1
/
2
HP
3
/
4
HP
1 HP
1
1
/
2
HP
2 HP
3 HP
6'
25 EFF %
30
25
30
8'
10'
12'
18'
32
32
G 53⁄8" DIA.
H 5"
A 45⁄16"
B 4"
C 33⁄4"
D 31⁄2"
E 31⁄4"
F 3"
m3⁄ hr
Model NPO / 1SN Size (Tamaño) 1 x 11⁄4-6
RPM 3500 Curve (Curva) CN0423R01
U.S. GPM
NOTE: Not recommended for operation
beyond printed H-Q curve.
NOTA:No se recomienda para funcionamiento
superior al impreso en la curva H-Q.
CAPACITY (CAPACIDAD) Q
METERS
METROS
FEET
PIES
TOTAL DYNAMIC HEAD (CARGA DINAMICA TOTAL) H
NPSHR– FEET (PIES)

PAGE 12
Commercial Water
Goulds Water Technology
0
20
40
60
80
0
10
20
30
6040200
3050
100
15
5
80 160
1510
A 55⁄16" DIA.
C 45⁄8"
D 45⁄16"
E 41⁄16"
B 51⁄16"
F 33⁄4"
G 37⁄16"
30 EFF %
6'
3'
40
44
42
40
42
12'
15'
9'
3
/
4
HP
1 HP
1
1
/
2
HP
2 HP
3 HP
140120100
2520 35 40
35
25
Model NPO / 2SN Size (Tamaño) 11⁄4x 11⁄2-6
RPM 3500 Curve (Curva) CN0470R00
NPSHR– FEET (PIES)
m3⁄ hr
U.S. GPM
CAPACITY (CAPACIDAD) Q
METERS
METROS
FEET
PIES
TOTAL DYNAMIC HEAD (CARGA DINAMICA TOTAL) H
NOTE: Not recommended for operation
beyond printed H-Q curve.
NOTA:No se recomienda para funcionamiento
superior al impreso en la curva H-Q.
0
20
40
60
80
0
10
20
25
500
50
120
15
5
1510
100
200150100
D 4
5
⁄ 8 "
A 5
7
⁄ 16 " DIA.
B 5
1
⁄ 4 "
C 4
15
⁄ 16 "
F 4
3
⁄
16
"
G 3
3
⁄ 4 "
5
40 EFF %
45
50
10'
15'
52
20'
45
35'
2 HP
3 HP
5 HP
7
1
/
2
HP
30
35
20 25 30 35 40 45 50 55
Model NPO / 3SN Size (Tamaño) 11⁄2x 2-6
RPM 3500 Curve (Curva) CN0473R00
NPSHR– FEET (PIES)
25'
30'
m3⁄ hr
U.S. GPM
NOTE: Not recommended for operation
beyond printed H-Q curve.
NOTA:No se recomienda para funcionamiento
superior al impreso en la curva H-Q.
CAPACITY (CAPACIDAD) Q
METERS
METROS
FEET
PIES
TOTAL DYNAMIC HEAD (CARGA DINAMICA TOTAL) H
E 4
7
⁄ 16 "
PERFORMANCE

PAGE 13
Commercial Water
Goulds Water Technology
0
20
40
60
80
0
10
20
6040200
2050
70
50
30
10
15
5
80 120
1510
A 5
5
⁄ 16 " DIA.
C 4
5
⁄
8
"
D 4
5
⁄ 16 "
E 4
1
⁄ 16 "
B 5
1
⁄ 16 "
F 3
3
⁄ 4 "
G 3
7
⁄ 16 "
30 EFF %
2'
40
4' 42
44
40
42
10'
6'
8'
3
/
4
HP
1 HP
1
1
/
2
HP
2 HP
1
/
2
HP
100
25 30
Model NPO / 2SN Size (Tamaño) 11⁄4x 11⁄2-6
RPM 2900 Curve (Curva) CN0472R00
NPSHR– FEET (PIES)
m3⁄ hr
U.S. GPM
NOTE: Not recommended for operation
beyond printed H-Q curve.
NOTA:No se recomienda para funcionamiento
superior al impreso en la curva H-Q.
CAPACITY (CAPACIDAD) Q
METERS
METROS
FEET
PIES
TOTAL DYNAMIC HEAD (CARGA DINAMICA TOTAL) H
0
20
40
60
0
10
20
6050403020100
1550
50
30
10
15
5
70
10
G 5
3
⁄ 8 " DIA.
H 5"
A 4
5
⁄ 16 "
B 4"
C 3
3
⁄ 4 "
D 3
1
⁄ 2 "
E 3
1
⁄
4
"
F 3"
20 EFF %
4
32
32
30
7'
25
30 12'
1
/
2
HP
3
/
4
HP
1 HP
11/2HP
25
2 HP
Model NPO / 1SN Size (Tamaño) 1 x 1
1
⁄
4
-6
RPM 2900 Curve (Curva) CN0469R00
NPSH
R
– FEET (PIES)
m
3
⁄ hr
U.S. GPM
NOTE: Not recommended for operation
beyond printed H-Q curve.
NOTA:No se recomienda para funcionamiento
superior al impreso en la curva H-Q.
CAPACITY (CAPACIDAD) Q
METERS
METROS
FEET
PIES
TOTAL DYNAMIC HEAD (CARGA DINAMICA TOTAL) H
PERFORMANCE

PAGE 14
Commercial Water
Goulds Water Technology
0
20
40
60
80
0
10
20
500
5050
15
5
1510
200150100
70
50
30
10
D 4
5
⁄
8
"
A 5
7
⁄ 16 " DIA.
B 5
1
⁄ 4 "
C 4
15
⁄ 16 "
E 4
7
⁄ 16 "
F 4
3
⁄ 16 "
G 3
3
⁄ 4 "
4'
40 EFF %
45
10'
50
50
14'
17'45 20'
24'
2 HP
3 HP
5 HP
1
1
/
2
HP
1 HP
52
55454035302520
Model NPO / 3SN Size (Tamaño) 11⁄2x 2-6
RPM 2900 Curve (Curva) CN0475R00
NPSH
R
– FEET (PIES)
m
3
⁄ hr
U.S. GPM
NOTE: Not recommended for operation
beyond printed H-Q curve.
NOTA:No se recomienda para funcionamiento
superior al impreso en la curva H-Q.
CAPACITY (CAPACIDAD) Q
METERS
METROS
FEET
PIES
TOTAL DYNAMIC HEAD (CARGA DINAMICA TOTAL) H
PERFORMANCE

PAGE 15
Commercial Water
Goulds Water Technology
PRIMARY APPLICATIONS
Applications for the NPO are generally identified by a need to handle small solids and particulate in combination
with detergents. These applications will typically see the benefits of stainless steel construction and open impeller
design.
Examples of such applications include:
Commercial Dishwashers
Commercial Laundry Systems
Parts Washers
Machine Tool Coolant Recirculation
Circulating Systems for Detergents, Degreasers and Lubricating Oils
Most of these applications are characterized by high OEM business, with potential being evenly split between new
systems and replacement pumps for existing installations. In both cases, the sale will be primarily through the OEM
organization.
The following pages provide information on several example applications to help you identify potential OEM
accounts for the NPO in your area. Your Goulds Water Technology Regional Sales Manager, and Goulds Water
Technology Applications Engineering can help you in working with OEM prospects. Evaluation of the entire OEM
system should be done before recommending a specific model.
The following S.I.C. numbers can be used to help you locate NPO prospects. Use these with either your Goulds
Water Technology database or local industrial directory.
SIC# ACCOUNT TYPE
3561 Parts washers and machine tool coolant
3582 Commercial laundry and cleaning systems
3589 Commercial Dishwashers

PAGE 16
Commercial Water
Goulds Water Technology
The Dishwasher Market for the NPO is composed of those companies which manufacture commercial dishwash-
ers for use in restaurants, bars and cafeterias in various types of institutions. This is not the same as the residential
dishwasher market, which uses considerably smaller pumps.
The commercial dishwasher market in North America is about 20,000 pumps per year. Companies which manu-
facture these dishwashers are typically in one of two businesses: Chemical or restaurant supply. The differences
between these two types of companies have a lot to do with how they view their product and the pump which
goes into it.
CHEMICAL COMPANIES
Chemical Companies which produce commercial detergents may also manufacture dishwashers. The dishwasher
is usually designed to maximize the effectiveness of the company’s detergents and is often leased or rented as a
part of a purchase agreement for the detergents. This may also involve either direct or contracted service from the
company to fix customer machines.
Due to this, the chemical company is often very interested in the quality and reliability of the pump. Pricing is
important, but usually less important than minimizing service time. The more the machine is running, the more
detergent will be used! Key benefits of the NPO are:
— Complete stainless steel construction for resistance to detergents, plus a cleaner overall
package since most of the other components are also stainless.
— Open impeller design for small solids handling.
— Centerline discharge and casing rotation for easy plumbing.
— Local inventory and support from the distributor.
— Local technical help across the country and around the world.
RESTAURANT SUPPLY
These companies are primarily in business to sell hardware. Some may distribute a line of detergents, but they
don’t make them. In addition to washers, they may also manufacture cabinets, tables, refrigerators and ovens.
DISHWASHER MARKET

PAGE 17
Commercial Water
Goulds Water Technology
Since most of the profit for such companies needs to be made on the initial sale of the washer, cost of manufacture
is much more important than it would be to the chemical company. Despite this, these companies are good pros-
pects for an NPO, because it gives them a competitive advantage. Almost all dishwasher pumps are presently cast
iron. Some manufacturers have put in plated or stainless impellers to try to improve pump life, but until now, the
cost of a completely stainless pump was much too high to justify in this application. The NPO is the first completely
stainless pump to meet the performance and solids handling need and still be within the general cost range of cast
iron bronze fitted pumps. Key benefits of the NPO are:
— The all stainless design of the NPO gives these companies a competitive advantage since stainless is
much more resistant to the detergents and chlorides used in dishwashing.
— Pump maintenance time and costs are reduced.
— Overall system costs/market prices can be kept in line while growing market share.
— All of the other benefits of the NPO covered for the chemical companies on the previous page.
TYPICAL DISHWASHER DESIGN
Most commercial dishwashers are open stainless steel cabinets designed to accommodate standard sizes of dish-
washer racks. One or more spray wands are located at the top or bottom of the cabinet and a drain is at the bot-
tom.
The dishwasher runs in two cycles: detergent wash and clean water rinse. Often, the rinse water is reused with de-
tergent for the next machine cycle. Water temperature is 140º – 180º F and may be heated internally or by another
source in the building. The cost of hot water is important to operation, which is why the rinse water is reused.
Due to the electrical power normally found in a restaurant and the humid conditions inside the washer cabinet, a
single phase 115V motor with solid state switch is often used.
DISHWASHER MARKET

PAGE 18
Commercial Water
Goulds Water Technology
Pot and pan washers and glass washers also fall into this market area. Pot washers may demand a higher pressure
than the NPO can provide, but they are good prospects for an SSH. Glass washers are becoming more popular as
an appliance for bars due to the increase in sanitary regulations. These units are designed to fit under the bar and
are good prospects for the NPO.
COMMERCIAL LAUNDRY
Commercial clothes washing equipment is another good application for the NPO. These systems are typically set
up as a series of wash and rinse stations with one pump per station. Due to the detergents, chlorine bleaches, fab-
ric softeners and other chemicals used in these systems, stainless steel is the preferred material for all components
exposed to the liquid. In addition, most systems have several filters to remove lint. Despite this, the pump is usually
exposed to a fair amount of lint and dirt which can clog up impeller vanes. To avoid this problem, an open impeller
is preferred.
A variation of the standard systems involves ozone injection to reduce the amount of detergents needed to clean
the clothes. NPE pumps with viton elastomers are already being used in this service since the lint would not enter
the ozone injection system.
Larger versions of dry cleaning and laundromat type machines may also be prospects for the NPO, although many
use smaller pumps.
Primary benefits of the NPO in commercial laundry applications include:
— Reduced maintenance due to elimination of lint clogs.
— Chemical resistance of 316L stainless steel and 316 cast pump components.
— Lower cost and lighter weight than typical cast stainless alternatives.
DISHWASHER MARKET

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Commercial Water
Goulds Water Technology
Cutaway view of double drum CBW
PARTS WASHERS
Another market which could use the benefits of both stainless steel and open impellers is parts washing. These
systems are used in manufacturing companies to remove chips, dust, oils and other residue from finished parts.
Machined parts are good examples of components which are usually washed after manufacture.
Typically, these systems use various chemical detergents and solvents under pressure to clean the part. The deter-
gent is then strained to remove chips and residue, then returned to the pump for recycling. Depending on how
good the straining process is, the pump may still see some fairly large particles. An open impeller design allows
any residual material to pass and avoids potential damage to the pump.
Although the durability of stainless steel is an advantage in the detergent environment of a parts washer, the stan-
dard pump is typically cast iron due to traditional stainless costs. The NPO in stainless steel increases pump life,
matches the materials commonly used for the rest of the unit and eliminates the chance of rust contaminants in the
system.
DISHWASHER MARKET

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Commercial Water
Goulds Water Technology
Typical Parts Washer
MACHINE TOOL COOLANT
A similar application can be found in the machining process itself. Coolant or machining oil is recirculated through
the machining center to aid the metal cutting process. This recirculation often brings excess chips or filing into the
pump. The 316 cast open impeller of the NPO can easily handle these particles with very little chance of damage
or wear.
DISHWASHER MARKET