Amtrol SPT-21, SPT-56, SPT-35, SPT-18, SPT-70, SPT-42, SPT-50, SPT-11, SPT-28 Sizing the SURGE-TROL

Page 3

SIZING THE SURGE-TROL

Precise Sizing For Pump Shut-down:

Volume of Tank in Gallons =

Vv

 

 

 

 

AF

 

 

 

AF - Acceptance Factor =

P

1

+ 14.7 1/n

 

 

 

1 - ( P

+ 14.7)

 

2

 

 

 

 

Vv - Vacuum Volume = Qss x Tc x 7.481 Tc - Critical Time in seconds = 2La

NOTE: Set pre-charge pressure 50% below static pressure.

Precise Sizing For Pump Start-up:

(

SG x 2 x Qs x L

) (

P + 14.7

)

1/n

449a

 

 

 

P 2

+ 14.7

 

 

Volume of Tank in Cubic Feet =

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(

P2

+ 14.7

 

)

1/n -1

 

 

 

 

 

 

 

 

 

 

 

 

 

P

1

+ 14.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: Set pre-charge pressure 15% below static pressure.

NOTE: To convert cubic feet to gallons multiply by 7.481.

Use:

SG = Specific gravity of fluid: Water 1 Ethylene glycol 1.1 Propylene glycol 1.1 Glycerin 1.3

Qs = Fire pump flow rate in gpm

Qss = Fire pump flow rate in feet per second

L= Length of pipe in feet

a= Speed of pressure wave

 

 

in feet per second:

Steel pipe 4500 ft/sec

 

 

 

Cast iron = 4500 ft/sec

 

 

 

Ductile iron 4500 ft/sec

 

 

 

PVC pipe = 1250 ft/sec

P2

=

Maximum allowable pressure

P1

= Tank pre-charge pressure setting

n

=

Gas constant (pre-charge gas) dry air 1.2

nitrogen 1.4

A= Area of Pipe - pipe size

V = Velocity of water in feet per second

Precise Sizing Example

For Pump Shut-down Based On:

Pump = 100 GPM

Pipe = 2” Steel Pipe; 1000 ft of pipe

Static Pressure = 100 psig

Max. Pressure = 150 psig

Pre-charge Gas = Dry Air

Tc = a2L = 2(1000)4500 = 45002000 = .444

Vv = Qss x Tc x 7.481 = 9.5 x .444 x 7.481 = 31.55

AF =

1 - ( PP1

+

14.7

)1/n =

 

1 - ( 164.764.7 )1/1.2 = .54

+

14.7

 

 

2

 

 

 

 

 

 

 

Volume of Tank in Gallons =

Vv

=

31.55

= 58.4

 

 

 

 

 

AF

 

.54

 

Recommendation = SPT-11

   

        Tank

       

A

       

B

Sys.

C

D

E    

      Ship

 

Description

Standard Construction

   

        Vol.          

Height      

Diameter

Conn.

Conn.

Conn.

Stand

        Wt.

 

 

 

 

Model

 

 

 

 

 

 

 

 

 

 

Inset

CtrLine

Dia

 

 

 

Shell

Steel

No.

Lit.

 

Gal

mm

ins.

 

mm

 

ins.

ins.

ins.

ins.

ins.

kg

lbs.

 

 

 

 

 

 

 

Bladder

Heavy Duty Butyl

SPT-7

200

 

53

1245

487/8

610

 

24

4

19/16

83/16

19

166

367

 

SPT-11

300

 

80

1600

627/8

610

 

24

4

19/16

83/16

19

208

459

 

 

NSF/ANSI 61

SPT-14

400

 

106

1956

767/8

 

610

 

24

4

19/16

83/16

19

282

618

 

 

 

Bladder Thickness

.100 Minimum

SPT-18

500

132

2311

907/8

610

 

24

4

19/16

83/16

19

333

731

 

 

 

 

 

System Connection

Steel - ANSI Flange

SPT-21

600

158

1893

7411/16

762

 

30

4

13/8

71/4

24

433

950

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPT-28

800

 

211

2365

931/8

762

 

30

4

13/8

71/4

24

513

1125

 

Coating

Red Oxide Primer

SPT-35

1000

 

264

2086

821/8

 

914

 

36

6

31/4

71/2

30

693

1520

 

 

 

Factory Precharge

25 PSIG (1.7 bar)

SPT-42

1200

317

2465

941/2

914

 

36

6

31/4

71/2

30

784

1720

 

 

 

 

 

 

 

SPT-50

1400

370

2781

1091/2

914

 

36

6

31/4

71/2

30

866

1900

 

 

 

SPT-56

1600

422

2178

853/4

1220

 

48

8

13/4

107/8

42

1049

2300

 

 

 

SPT-70

2000

 

528

2528

995/8

 

1220

 

48

8

13/4

107/8

42

1231

2700

 

 

 

Image 3
Contents SURGE-TROL Installation and Operation Instructions Sizing the SURGE-TROL Amtrol INC. Limited Product Warranty
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SPT-11, SPT-56, SPT-18, SPT-14, SPT-28 specifications

Amtrol is a well-known name in the field of water storage and heating, particularly recognized for its innovative products that combine reliability with advanced technology. The Amtrol SPT series, including models SPT-35, SPT-21, SPT-42, SPT-50, and SPT-7, represents a range of superior pressurized tanks designed for various applications in residential and commercial settings.

One of the standout characteristics of the Amtrol SPT series is the use of superior materials and craftsmanship that ensure durability and longevity. These tanks are typically constructed from high-quality steel, coated with a corrosion-resistant enamel finish, which helps protect against wear and tear from environmental factors. This ensures that the tanks maintain their structural integrity over time, providing customers with a reliable storage solution.

In terms of technology, the SPT series incorporates advanced manufacturing techniques that enhance performance. These tanks utilize an internal polypropylene liner that prevents rust and corrosion, maintaining the quality of the water stored within. The tanks are also equipped with Amtrol's revolutionary butyl diaphragm, which separates water from the air, ensuring consistent pressure and reducing the frequency of cycling for water pumps. This feature ultimately leads to energy savings and less wear on the pump system.

Each model in the SPT series has its unique capacity and dimensions to suit different needs. For instance, the SPT-21, with its compact size, is ideal for smaller applications where space is limited, while the SPT-50 provides a larger storage capacity for more extensive requirements. The SPT-35 and SPT-42 fall in between, catering to a range of mid-sized applications, and the SPT-7 offers the flexibility needed for specific, smaller-scale uses.

Another notable feature of the Amtrol SPT series is the ease of installation and maintenance. The tanks come with pre-drilled openings for quick connectivity to plumbing systems and come with clear instructions, making the installation process straightforward. Their design also allows for easy access for routine maintenance, further enhancing the product's user-friendliness.

Overall, Amtrol’s SPT series combines technological innovation with practical design, offering a robust solution for water storage needs. Whether for residential or commercial applications, these tanks deliver efficiency, longevity, and peace of mind to users looking for reliable water management solutions.