Penberthy BB-21, AA-21, CC-21, DD-21, EE-23 Technical Data Manual

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PENBERTHY

NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

www.jrgjt.com

NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

[e-mail]

automatic
injector

This technical bulletin includes general
information about Penberthy Automatic
Injectors plus specific details for individ­ual unit selection. Used primarily as
boiler feed pumps, Penberthy Automatic
Injectors are used in numerous other
applications for pumping liquids and dis­charging at high pressure and tem­perature.

Section 1000
Bulletin 1500

Issued 6/87

Re

laces 9/77

The Injector

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NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

www.jrgjt.com

NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

[e-mail]

The Injector may be defined as a boiler feeding pump,
utilizing the velocity and condensation of a jet of steam
from the boiler to lift and force into the same boiler a jet
o water many times the weight of the original jet of
steam.

Although they are generally considered as boiler feed
pumps, injectors are also often used on other applica­tions where hot water under high pressure is desired.

ADVANTAGES

The injector offers defin ite ad vantages over me­chanically operated pumps when cold water
make-up is used to feed boilers. Some of these
advantages are:

Unit is compact, has no mechanically operated

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parts and requires no foundation or floor space.

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First cost and maintenance are low.

Warm water is fed into the boiler without the

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necessity of preheating the water.

Operating steam is condensed and returned to the

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boiler resulting in a thermal efficiency of nearly
100%.

It is not dependent upon an outside source of

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power.

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Dependable in operation.

Operating Principle of Penberthy Automatic Injectors

When steam supply valve is opened, steam passes
through steam jet into suction chamber, proceeds
through suction jet and out of the overflow. Steam,
which attains a velocity of approximately 2500 ft per
second as it leaves the steam jet, entrains the air in
suction chamber and creates a vacuum.

The vacuum created in suction chambe
begins to draw in water from supply line.
The water is now entrained by the steam
and a high velocity mixture of water and
steam passes through the suction jet and
out of the overflow.

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The Company

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NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

www.jrgjt.com

NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

[e-mail]

Since its organization in 1886, the Penberthy Manu­facturing Co.* has been well known as a leading
manufacturer of injectors. As a result of its superior
basic injector design, continued improvements in
performance, manufacturing methods and standard
of quality, Penberthy leadership in the injector field
has been universally recognized for many years.
Penberthy injectors and service parts may be

PENBERTHY AUTOMATIC INJECTORS

Automatic Restarting

All Penberthy injectors are of the automatic restarting type.
If the established flow of water from an injector to the boiler
is interrupted temporarily by t he admission of air into the
suction line or by a jolt causing the overflow valve to open,
the injector will automatically reestablish flow without the
necessity of regulating any valves.

Feeds Warm Water to Boiler

Penberthy injectors feed water into the boiler at a tempera­ture of from 130°F to 212°F depending upon the steam pres­sure and temperature of the supply water. By throttling the
water supply line, feed water temperatures up to 212°F can
be obtained under most conditions of operation.

Design

Injectors are designed so as to give well-balanced operation
against the greatest possible range of steam pressure, water
tem

erature and suction lift and to maintain satisfactor

purchased from any one of the thousands of jobber
and dealer representatives in all principal cities and
countries of the world. Their knowledge of the vari­ous applications of the Penberthy injector, covering
many years of experience, assures prospective users
that they will obtain intelligent engineering sales
service.

performance for a long period of service. Designs are t he
result of years of experience with injector applications.

Injector connections have uni on tailpipes permitting quick
removal from the line.

all parts are easily removed for cleaning or replacement and
are precision made to assure interchangeability in the field.
Workmanship is highest quality. Years of manufacturing has
resulted in the training of skilled craftsmen and the develop­ment of advanced production methods.

Material

Injectors are of all bronze construction with special bronze
alloys being used for suction and delivery jets to resist wear.

Inspection and Testing

All injectors are tested at the factory on actual boiler installa­tions, assuring that injectors will meet all performance claims
as specified for the various models.

When the amount of steam and water reach the proper
proportion, the steam gradually condenses as the mix­ture advances through injector. Upon reaching deliver

et parallel the mixture is fully condensed.

*Formerly Penberthy Injector Co.

The energy contained in the water passing through delivery jet is sufficient to
build up a pressure, greater than the boiler pressure, causing water to flow
through the discharge check valve into the boiler. When flow into the boiler is
established the overflow valve closes automatically and prevents the entrance
of air which would disrupt operation of injector. Total operating cycle requires
only a few seconds.

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Applications

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NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

www.jrgjt.com

NORTHEAST CONTROLS INCORPORATED

TEL: [phone] ext. 23 for Venturi Group

[e-mail]

Required Information

Injectors are installed as auxiliary equipment on pow er
boilers, package steam generators, locomotive boilers
and heating boilers that are required by many industries
such as:

Manufacturing Industries:

oil production and ref ining, agriculture, mining, lumber,
etc.

Service Industries:

izin

, dairies, laundries, public utilities, transportation,

Pressing and dry cleaning, vulcan-

Food processing, chemical,

Uses

Uses for injectors can be classified generally as follows:

Stand-by Boiler Feed Pump Service

Injectors provide boilers, which are already equipped
with mechanically operated boiler feed pumps, with a
reliable low cost secondary means of feed water supply.
Many boiler manufacturers supply Penberthy Injectors
as original equipment on their steam boilers.

Primary Boiler Feed Pump Service

Boilers not provided with mechanical feed water pumps
can depend upon injectors to function satisfactorily as
the sole source of feed water supply.

Preheating Make-up Water

On applications where the water supply pressure ex­ceeds the boiler steam pressure, injectors may be used
to heat the water before injection into the boiler, avoiding
the disadvantage of cold water striking hot boiler sur­faces.

Injecting Feed Water Treatment Compounds

Suitably diluted mixtures of boiler feed water treatment
compounds are picked up and injected into the boiler
without difficulty.

Injector can be properl y selected by c onsidering the
following facts relating to the operating conditions under
which the injectors will be required to work:

1. Lowest and hi ghest operating steam pressure car­ried by the boiler

2. Vertical distance that the supply water must be lifted,
if the water supply is below the injector, and the
horizontal distance from the water intake to the in­jector.

3. The supply water pressure if the water is taken from
the city mains or from elevated tanks.

4. The temperature of the supply water.

5. The maximum rate of evaporation of water from the

Capacity

The size of the injector to be selected depends princi­pally upon the rate at which the boiler is called upon to
evaporate water. It should be chosen so that it will de­liver at least 30% (preferably 50 to 100%) more water
than the expected maximum evaporation rate of boiler.
Catalog horsepower ratings are based upon supplying
approximately 75% more than the rate of evaporation of
a boiler operating at full rating, or between 7 and 8 gal ­lons per boiler horsepower. Ref erence to injector per­formance tables will indicate that the capacity of an in­jector will vary, depending upon the operating steam
pressure, suction lift, suction water temperature or a
combination of these conditions. Unless an injector is
already operating at limiting conditions, its capacity can
be reduced b

regulating the water supply line valve to

High Pressure and Temperature Water Supply

Injectors may be used as a source for obtaining a supply
of hot water under high pressure for washing floors,
containers, machine parts, etc. When used for this pur­pose the discharge nozzle must be sized to suit the
injector capacity. See page 10 for details of installation.

Selection of Injectors

Models or types of injectors are available from which to
select an injector that will operate satisfactorily and effi­ciently under vi rtually any f ield conditions that may be
encountered in steam plant practice with steam pres­sures up to 250 pounds per square inch.

Catalog Data

By referring to performance and dimensional information
given on t he following pages, the injector that will best
suit the capacity and operating conditions of the applica­tion can be readily selected and s pecified. In the event
of unusual operating conditions or doubt as to proper
selection, our engi neering department is available to
offer recommendations and suggestions.

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