8/18/2019 Ejemplo de Calculo de Diseño Presion Hdpe

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Attachment 1 - HDPE Pipe Design Calculations

12 Interruptible IP Service Line

The

specification

for 12 Interruptible

IP Service

Line is

the following:

1. Length: 3,597 feet

2. Nominal outside diameter,

D ,

inches: 12.75 inches

3. Nominal wall thickness, t , inches: 1.416

inches

4.

Type and/ or grade

of

pipe: High Density Polyethylene (HDPE), SDR-9,

PE4710-

PE100 (PE3408)

5.

Hydraulic Design Basis: 1,600

psi

at 73

0

F

6.

Specified

Minimum

Yield

Strength:

>3,500

psi

7.

Maximum Allowable

Operational

Pressure (MAOP):

125

psi

According 16 NYCRR §255.121, the design pressure formula for plastic pipe is

the

following:

25

x

0.32

p =

S D R

Where:

P=

Design

Pressure,

psig

S=Hydrostatic

Design

Basis (HDB) at

pipeline

operating pressure, psig

SDR

Standard Dimension Ratio

With the above values substituted

in,

the design

pressure

for this pipeline is

128 psi.

This exceeds the project MAOP of 125 psi and is acceptable.

The

following is the formula

for hoop

stress of a pipe:

Where,

S=

Hoop Stress,

psig

D= Outside Diameter, in.

T=

Wall

Thickness,

in

P= Internal Pressure (taken as MAOP), psig

With the above values substituted in, the hoop stress for

this

pipeline is 563 psi.

Therefore,

The

ratio

of pipe

stress to the hydraulic design

basis is

35.0 .

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Attachment

1 HDPE Pipe Design Calculations

6 Firm IP Service Line

The specification

for

6 Firm

IP

Service

Line

is

the

following:

1.

Length:

3,597 feet

2. Nominal

outside diameter,

D ,

inches: 6.625 inches

3.

Nominal

wall thickness, t , inches: 0.736 inches

4.

Type and/ or grade of pipe: High Density Polyethylene (HDPE), SDR-9, PE4710-

PE100

(PE3408)

5.

Hydraulic Design

Basis:

1,600

psi

at

73

0

F

6. Specified Minimum Yield

Strength:

>3,500 psi

7. Maximum Allowable

Operational

Pressure (MAOP): 125 psi.

According 16 NYCRR §255.121, the design pressure formula

for

plastic pipe is the

following:

25 x 0 32

p

SDR

Where:

P=

Design

Pressure, psig

S=Hydrostatic

Design

Basis (HDB) at pipeline operating pressure, psig

SDR= Standard Dimension

Ratio

With the above values substituted in, the design pressure for this pipeline

is

128

psi.

This exceeds the project MAOP

of

125

psig

and is acceptable.

The

following is the formula for hoop stress of a pipe:

Where,

S=

Hoop

Stress, psig

D=

Outside Diameter, in.

T= Wall

Thickness, in

P= Internal Pressure (taken as

MAOP),

psig

With the above values substituted in, the hoop stress

for

this pipeline is 563 psi.

Therefore, the

ratio

of pipe

stress

to the hydraulic design basis is 35.0

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