condenser water pipe base support

7/25/2019 Condenser Water Pipe Base Support

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Block 07 Calculation sheet

Two 400mm pipes are used to handle the condenser water of Block 07(supply & return). We use a base platform at LL3 to cater the total weight of the pipes.

1. Calculations for base platform

Data

- Selected beam for base platform 150x150 Data sheet is attached (Annex 01)

B 150 mm

D 150 mm

t 7 mm

Ix-x 1623 cm4

Figure 1 : I - Beam detail

- Yield strength of steel S 275 16 mm Data sheet is attached (Annex 02)

275 Mpa

- Technical data for anchor bolts are taken from fischer catalog

- Condensor water riser height (m) 46.667 m Refer attached drawing (Annex 03)

- Linear density of pipe (400mm),sch 40 with water 237.3 kg/m data sheet attached (Annex 04)

Notes/Assumptions:- Self weight of I - beam is negligible

- Load on the platform is considered as an UDL

- Concreate wall is considered as cracked concreate

- Beam is considered as simply supported beam

w

B

1 Designed by : Chathura Siriwardhana


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Figure 2 : Forces on base platform at LL3

a. Calculation for the beam

Nos of beams 5

Beam length 2.5

Load per pipe with water 108.64 m

Nos of pipes 2

Total load 217.27 kNWith 1.5 safety factor (2W) 326 kN

UDL(w) 130.40 kN/m

UDL(w) per beam 26.08 kN/m

Nos of brackets 9 Nos

Considering vertical forces on the beams RA= RB(=wl/2) 32.60 kN

Maximum bending moment on the beam (wl2/8) 20.38 kNm

Maximum bending stress of the beam ( = -My/I) 188.31 Mpa < 275 Mpa OK

b. Base plate design (refer ASD procedure)

Allowable bearing stress on the MS plate (0.7 f'c) 192.5 Mpa f'c is compressive strengh of steel (=275Mpa)

Required plate area (Axial force/bearing stress) 0.0008468 m2 N'xB' 0.03 0.029 m

N and B are the diamentions of the base plate

Considering vertical 250 mm pipe, 300 x 300 x 16 mm plate is selected.

Plate thickness according to the Allowable Stree Design (ASD) Procedure (tp= max{m or n} (fp/(0.25Fy))) 0.0041 m

4.18 mm < 16 mm OK

l

x

A

RA RB



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The base plate is checked for bending

Note/ Assumptions:

- Plate is considered as cantilevered beam

- Axial force due to pipe riser act on the base plate as an UDL.

UDL (w) 543.33 kN/m

250 Maximum moment (wl2/8) 0.04 kNm

Bending stress 3.32 Mpa < 0.75x275 Mpa OK

Therefore plate does not fail due to bending

Figure 3 : Bending moment on base plate

c. Anchor bolts for vertical wall

Note:

- Nos of required bolts are calculated considering shear load

- Fischer model FAZ ll 16 is considered for the analysis. Data sheet is attached (Annex 05)

- Friction force between concrete wall and the end plate has not been considered.

wl



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Fischer

model

FAZ ll

Permissible

shear load V

perm

RA

(kN)

bolts

per

beam

(RA/Vpe

rm)

Required

min bolts

16 31.4 32.60 2 10 OK

Figure 4 : Shear force on side plate of the base platform at LL3

C1

C2

RA


condenser water pipe base support

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