**SPECIAL SPECIFICATION**

**SECTION 15161**

**[PUMPS - GENERAL]{.underline}**

[Page]{.underline}

PART 1 - GENERAL

1.01 Work Included 2

1.02 Related Work 2

1.03 Pump Selection 2

1.04 Pump Size And Type 3

1.05 Certified Data 3

PART 2 - PRODUCTS

2.01 Centrifugal Pumps 3

2.02 Circulators 5

**SPECIAL SPECIFICATION**

**SECTION 15161**

**[PUMPS - GENERAL]{.underline}**

[PART 1 - GENERAL]{.underline}

1.01 [WORK INCLUDED]{.underline}

> This section provides general characteristics for pumps specified in
> Division 15 -Mechanical.

1.02 [RELATED WORK]{.underline}

A. [Division 15 - Mechanical]{.underline}

1\. Insulation - Mechanical Systems, Section 15250.

2\. Piping Systems, Section 15051.

3\. System Component Checkout and Balance, Section 15901.

B. [Division 16 - Electrical]{.underline}. Motors.

1.03 [PUMP SELECTION]{.underline}

A. Select pumps conservatively for scheduled conditions. Furnish pumps
which have reasonably high efficiencies, with peak efficiency at or near
rated conditions. Select pumps that will operate stably at 15-foot
suction lift despite substantial reduction in head or substantial
increase in delivery.

B. If the pumps proposed are not considered suitable, submit
manufacturer\'s data on other pumps, for review.

1.04 [PUMP SIZE AND TYPE]{.underline}

> Provide motor-driven pumps of the type, speed, and pump connection
> sizes scheduled on drawings. Select pumps that are not overloaded
> throughout the entire range of pump operation.

1.05 [CERTIFIED DATA]{.underline}

> Submit manufacturer\'s certified pump curves for review.

[PART 2 - PRODUCTS]{.underline}

2.01 [CENTRIFUGAL PUMPS]{.underline}

A. [Acceptable Manufacturers]{.underline}

1\. Weinman.

2\. Aurora.

3\. Weil.

4\. ITT Bell & Gossett.

B. [Casing]{.underline}. Provide a cast iron, volute type, centrifugal
pump with screwed or Class 125 ANSI flanged connection and tapped
openings for vent and drain, equipped with petcocks. Casing for pumps
3\"x4\" and larger must accommodate an impeller 15 percent greater in
diameter than the impeller actually selected to meet specified
performance. Design casings to provide for complete removal of bearing,
seals and impeller without disturbing connection piping.

C. [Impeller]{.underline}. Furnish an enclosed, cast bronze impeller,
keyed and locked to the shaft, statically and hydraulically balanced.

D. [Wearing Rings]{.underline}. Provide bronze, renewable wearing rings
on all pumps 1-1/2 inches and larger.

E. [Shaft]{.underline}. Furnish a stainless steel shaft, turned and
ground to accurate dimension, of ample size to prevent deflection and
key slotted as required.

F. [Bearing]{.underline}. Provide antifriction type bearings, grease
lubricated.

G. [Stuffing Box and Shaft Sleeves]{.underline}. Furnish a deep,
integral stuffing box, packed with suitable die-formed ring packing.
Provide a leakage water-cooled, bronze gland with stainless steel studs
and nuts. Furnish one-piece, machined-bronze shaft sleeves, keyed and
locked to the shaft, extending from the impeller hub through the
stuffing box, with a compression seal to prevent leakage between shaft
and sleeve. Provide bronze, water-deflection ring on the outboard end of
the sleeve, and a galvanized metal cover over stuffing box. Provide seal
cage and seal piping on pumps operating at 5 feet (1.5m) of water
pressure or less. Design pump so that mechanical seals may be installed
in lieu of packing at a later date.

H. [Support Bracket]{.underline}. Furnish a cast iron, pump support
bracket for close-coupled pumps. Machine the bracket for rabbet jointing
to pump casing and motor-end bracket to maintain rigid assembly and
accurate alignment between pump and motor.

I. [Pedestals]{.underline}. Furnish a cast iron pump and bearing
pedestal for pedestal-mounted pumps. Machine the pump bracket for rabbet
jointing to pump casing. precision bore the bearing support to provide
accurate alignment between bearings and pump.

J. [Motor Extension Shaft]{.underline}. For close-coupled pumps, provide
a motor with an extension shaft and a special end bracket. Machine the
end bracket to receive the pump support bracket for rigid bolted
assembly to ensure permanent, accurate alignment of pump and motor.

K. [Couplings]{.underline}. Provide a flexible mechanical coupling rated
for the full rated horsepower of the driving motor at motor speed.

L. [Base Plates]{.underline}. Mount the pump assembly and the motor on a
common rigid steel or cast iron base fabricated and arranged to ensure
rigid and true alinement of pump and motor shafts.

1\. Provide a cast iron base where pump is VFD driven.

2\. Furnish base plate with drop pan having tapped drain opening.

3\. Use chilled water pumps with extended steel base big enough to
receive all drip from suction and discharge flanges.

M. [Motors]{.underline}. All motors for pumps shall be 1750 rpm, TEFC.
Baldor, high efficiency variable torque.

N. Two-speed motors shall be high efficiency, ODP, separate winding,
variable torque.

2.02 [CIRCULATORS]{.underline}

> Furnish an all-bronze centrifugal circulator designed for in-line
> mounting, with a resiliently mounted motor, a centrifugal impeller, an
> alloy-steel shaft with thrust collar, a bronze sleeve bearing, a
> mechanical seal, a spring-type flexible coupling, and a wick-type oil
> circulating system.

END OF SECTION