tib 100 can barrel general design

8/3/2019 Tib 100 Can Barrel General Design

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Peerless Pump Company2005 Dr. M.L. King Jr. Street, P.O. Box 7026, Indianapolis, IN 46207-7026, USATelephone: (317) 925-9661 Fax: (317) 924-7338www.peerlesspump.com www.epumpdoctor.com

1 Revised 07/06

TECHNICAL INFORMATION

Bulletin

NUMBER 100

CAN (BARREL) GENERAL DESIGN

Vertical pumps used for booster service areusually installed in a can (barrel). By definition,the can is receptacle for conveying the liquid to thepump. Because the whole bowl assembly isincluded in the can, as show on figure 1, the bowlsare subjected to the difference of the bowl (inside)and suction (outside) pressures. The can issubjected to the suction pressure. The pumpdischarge head is sealed to atmosphere but itshould be provided with valve for air release.

There are many possible designconfigurations. Most of the time the pump isdesigned to suit the job pipe arrangement. Seethe following pages with figures 2 to 6 of typicalPeerless Pump design configurations.

The Sales Manual Hydro-Line sections 3410,3420, and 3445 show some of theseconfigurations in more detail including pump parts

list and overall pump and can dimensions.

Figure 7 shows multiple can installation.Figures 8 and 9 show submersible motor in acan installation.

FIGURE 1

*Can or barrel is used alternatively by Hydraulic Institute


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FIGURE 2. Typical Hydro-line Pumps

Mechanical seal and spacer-type coupling shown. Pumpsequipped with packing use a coupling with no spacer.

2 Revised 07/06


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FIGURE 3. Typical Hydro-Line Pumps

Mechanical seal and spacer-type coupling shown. Pumpsequipped with packing use a coupling with no spacer.

3 Revised 07/06


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Other variations of Model HE are similar to Model

HL except that vertical hollow-shaft motor andthreaded coupling are used.

FIGURE 4. Typical Hydro-Line Pumps

4 Revised 07/06


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FIGURE 5. Typical Hydro-Line Pumps with column betweendischarge head and bowl unit. Mechanical seal and spacer-type coupling shown. Pumps equipped with packing use a

coupling with no spacer.

5 Revised 07/06


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FIGURE 7. Multiple Can Installations

6 Revised 07/06


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FIGURE 8. Submersible can pump installation

7 Revised 07/06


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FIGURE 9. Submersible can pumps

8 Revised 07/06


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9 Revised 07/06

DESIGN PARAMETERSThere are a number of factors that can

influence the can design. However, there aresome design guidelines for successful installationwhich should be sued where possible.

Flow VelocityCan inside diameter should be selected so the

annular velocity in the area between the bowlassembly outside diameter and the can insidediameter does not exceed 4 to 5 ft/sec. Liquidscontaining solids require 3 ft/sec minimum velocity.

DiameterApproximately 1.2 to 1.5 bowl or suction bell

(case) diameter whichever is larger. Can diameteris selected in conjunction with flow velocity above.

Length

The length of the can is defined by the lengthof the pump assembly and NPSH required.

Hydraulic lossesThe hydraulic losses (He) between the can

inlet flange and pump suction bell, figure 11, areavailable from the following curves 2826482 to 85(Sales Manual, section 3410) for our typical pumpand can design configurations. In case the cansize or pump is different than those on the curves,the following approximate formula (from Vertical

Pumps by J. Diemas) can be used:

He = (K x Vc2) / 2g

Where K = 3.5Vc = annular velocity in can, ft/secg = 32.17 ft/sec

These losses will affect not only pumps headbut also NPSH available at impeller eye. In criticalNPSH applications Vc should be less than 3 ft/sec.

Location of pump suction bell opening withreference to can suction pipe inlet

A minimum distance of 2 can diameters fromcan suction pipe inlet center line to pump suctionbell, figure 12. For additional information, seeHydraulic Institute Standards 9.8.

Distance of pump suction bell to bottom of can0.5 bell diameters.

It is recommended for all Hydro-line pumpsto have a vortex suppressor. In this case, thedistance to be adjusted, if needed, toaccommodate the vortex suppressor. Thedistance between the vortex suppressor andthe bottom of the can to be approximately

0.125 bell diameters. In general, vortexsuppressor would improve any pumpinstallation intake flow conditions.

NPSH available (figure 11)

NPSH = Ha Hvpa + Hs - Hf

Where Ha = absolute pressure on thesurface of the liquid where thepump takes suction in feet; in

open system it is equal toatmospheric pressure

Hvpa = vapor pressure in feetHs = elevation from impeller eye to

fluid level in feet; it is negative ifthe fluid level is bellow theimpeller eye

Hf = friction and entrance headlosses in suction piping in feet

Design features of can (figure 12)

If the can and pump discharge column arelong and the can suction pipe inlet is located closeto the bottom of the pump, the impact of the fluidjet could impose sufficient force to deflect thecolumn. Use of baffle plate in front of the pumpcolumn or bowl unit is recommended.

A splitter along the inside of the can helps inpreventing vortex formation.

IMPORTANT NOTE

The information contained herein is for generalinformation only. Please consult the PeerlessPump Application Department for design details ofa specific application, giving pump design head,flow, liquid temperature, specific gravity, vaporpressure, NPSHa and mechanical details ofproposed installation. Peerless Pump will providerecommendations for pump ordering purposes.


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10 Revised 07/06


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11 Revised 07/06


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12 Revised 07/06


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13 Revised 07/06


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14 Revised 07/06


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FIGURE 11

15 Revised 07/06


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FIGURE 12

16 Revised 07/06

tib 100 can barrel general design

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