8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 1/23

1

STRESS ANALYSIS

&PIPE SUPPORTS

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 2/23

2

- The layout and design of piping and its supporting elements shall bedirected toward preventing following:

1. Piping stresses in excess of those permitted in code

2. Excessive thrusts and moments on the connected euipments

!. Excessive piping sag

". Excessive interference with thermal expansion and contraction in piping

SUPPORTS

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 3/23

!

How to decide the support

location ?

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 4/23

"

How to decide the tpe

support ?

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 5/23

#

- $ainly four types of supports are available.

1. %imple resting.

2. &uide

!. 'xial (estrain

". 'nchor - 'gain some more supports are available.

1. %pring ) *onstant and +ariable %upport

2. ,anger %upports.

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 6/23

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 7/23

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 8/23

/

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 9/23

0

STRESS ANALYSIS

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 10/23

1

!ASI" RE#UIRE$ENTS

- Piping system shall have sufficient flexibility to prevent thermal

expansion or contraction or movements of piping supports and

terminals from causing ) 

1. ailure of piping or supports from overstress.

2. 3etrimental stresses in piping or in connected euipment 4pump

and turbines etc.5 resulting from excessive thrusts and moments in

the piping.

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 11/23

11

%hen Analsis Reuired?

Or

%hich sste' need to (e

anal)ed?

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 12/23

12

Tpes o* Stresses

&

Allowa(le Li'its as per "ode

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 13/23

1!

Stresses in Pipe

- ,oop stress or *ircumferential stress due to 6nternal pressure.

- 7ongitudinal stress due to 6nternal pressure and weight.

- Thermal stress due to temperature gradient.

Allowa(le Stresses

- ,oop stress ) 'llowable stress as per table '-1

- 7ongitudinal stress ) 'llowable stress as per table '-1

- Thermal stress ) Thermal stress range %' as defined in the code.

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 14/23

1"

Ther'al stress ran+e SA

 %' 8 f 41.2# %c 9 .2# %h5

here;

f ) stress range reduction factor from table !2.!.#

%c ) basic allowable stress at minimum metal temperature

expected during the displacement cycle under analysis.

%h ) basic allowable stress at maximum metal temperature

expected during the displacement cycle under analysis.

 

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 15/23

1#

Hdrostatic stress

'llowable stress during hydro testing is 1.!! %c because at hydro

test we are testing the system to withstand near the <ield.

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 16/23

1

Load on Euip'ent No))les

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 17/23

1

Sa'ple "alculation

orce coming on end =o>>le.

*arbon steel pipe of mm ?3 with 1mm thic@ness at a temperature

of ! c.

E 8 2./# $si 4 1./// x 1" @gAmm25 from '%$E B !1.! Table *

Thermal expansion 8 !.2# x 1-! mmAmm 4from Table *15

' 8 pi A " x 42 ) #/25 8 1/#!#." mm2

  P 8 1/#!#." x 1./// x 1" x !.2# x 1-! 

8 120 tons

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 18/23

1/

Allowa(le No))le Loadin+

1. (* 1A20 ) for Euipments.

2. 'P6 1 ) for Pumps.

!. =E$' 2! ) for Turbines 4=ational Electrical $anufacturers

'ssociation5.

". 'P6 1; 10 ) for *ompressors.

#. 'P6 #0 ) for 'ir *oolers.

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 19/23

10

,ailures

1. *atastrophic ailure

2. atigue ailure

Static Analsis

1. %ustained *ondition

2. Expansion *ondition

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 20/23

2

$eans o* pro-idin+ ,le.i(ilit

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 21/23

21

"aesar Application *or Analsis

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 22/23

22

8/19/2019 Piping Stress & Support

http://slidepdf.com/reader/full/piping-stress-support 23/23

2!

Than/ You