Let’s say we have 2 pumps as attached iso.One pump are working and the rest is standby.How can we setup pump load case by using caesar II

Input data:

Operating Temperature = 45 °C
Design Temperature = 80 °C
Operating Pressure = 7.5 Kg/cm2 g
Design Pressure = 15.0 Kg/cm2 g

Mat. A106 Gr.B #150 Lbs
Pipe Size 4″, Sch.Std
Corrosion Allowance 1.5mm
None Insulation
Density = 1000 (kg/m3)

LOAD CASE DEFINITION KEY ( 2 PUMPS )

CASE 1 (HYD) WW+HP (without friction)
CASE 2 (OPE) W+T1+P1 (with friction)
CASE 3 (OPE) W+T1+P1 (without friction)
CASE 4 (OPE) W+T2+P1 (with friction)
CASE 5 (OPE) W+T3+P1 (with friction)
CASE 6 (OPE) W+T4+P1 (without friction)
CASE 7 (SUS) W+P1 (with friction)
CASE 8 (SUS) W+P1 (without friction)
CASE 9 (OCC) U1 (without friction)
CASE 10 (OCC) U2 (without friction)
CASE 11 (OCC) L11=L9+L10 (without friction)
CASE 12 (OCC) L12=L11+L8 (without friction)
CASE 13 (EXP) L13=L2-L7 (with friction)
CASE 14 (EXP) L14=L3-L8 (without friction)
CASE 15 (EXP) L15=L6-L8 (without friction)
CASE 16 (EXP) L16=L14+L15 (without friction)

Explain

Hydro Test Case

Case1: Hydro Test case, none-friction with WW=Water Filled Weight, HP=Hydro Pressure

Operation Case

Case2: Operating case with friction at operating temperature (T1=80°C), 2 pumps working
Case3: Operating case none-friction at operating temperature (T1=80°C), 2 pumps working
Case4: Operating case with friction, pumpA and (T2=80°C), pump B standby (T2=21°C)
Case5: Operating case with friction, pumpB working (T3=80°C), pump A standby (T3=21°C)
Case6: Operating case none-friction at TAMIN = 16°C ( For Stress Range Purpose ), 2 pumps at T4=16°C

Sustain Case

Case7: Sustain case with friction
Case8: Sustain case none- friction

Occational Case

Case9: Seismic Load ( X direction), none- friction
Case10: Seismic Load ( Z direction), none- friction
Case11: Seismic Load combined, none- friction
Case12: Sustain Case + Occational due to seismic, none- friction

Expansion Case

Case13:Expansion Case check with friction at operating temperature (T1=80°C)
Case14:Expansion Case check none- friction at operating temperature (T1=80°C)
This is stress check at maximum temperature, none- friction
Case15:Expansion Case check none- friction at mininum temperature (T4=16°C)
This is stress check at maximum temperature, none- friction
Case16:This case for stress range purpose, none- friction
[ minimum stress check(case15)+maximum stress check(case14)]

Please click link below to see videos about above tutorials

http://www.azpiping.com/tutorials/temperature-2pumps.htm
http://www.azpiping.com/tutorials/loads-2pumps.htm

Let’s say we have 3 pumps as attached iso.Two pump are working and the rest is standby.How can we setup pump load case by using caesar II

Input data

Operating Temperature = 45 °C
Design Temperature     = 80 °C
Operating Pressure       = 7.5 Kg/cm2 g
Design Pressure            = 15.0 Kg/cm2 g

Mat. A106 Gr.B #150 Lbs
Pipe Size 4″, Sch.Std
Corrosion Allowance 1.5mm
None Insulation
Density                           = 1000 (kg/m3)

Here are load case

LOAD CASE DEFINITION KEY ( 3 PUMPS )

Reference to Iso. In Fig.1

CASE 1 (HYD) WW+HP (without friction)
CASE 2 (OPE) W+T1+P1 (with friction)
CASE 3 (OPE) W+T1+P1 (without friction)
CASE 4 (OPE) W+T2+P1 (with friction)
CASE 5 (OPE) W+T3+P1 (with friction)
CASE 6 (OPE) W+T4+P1 (with friction)
CASE 7 (OPE) W+T5+P1 (without friction)
CASE 8 (SUS) W+P1 (with friction)
CASE 9 (SUS) W+P1 (without friction)
CASE 10 (OCC) U1 (without friction)
CASE 11 (OCC) U2 (without friction)
CASE 12 (OCC) L12=L10+L11 (without friction)
CASE 13 (OCC) L13=L12+L9 (without friction)
CASE 14 (EXP) L14=L2-L8 (with friction)
CASE 15 (EXP) L15=L3-L9 (without friction)
CASE 16 (EXP) L16=L7-L9 (without friction)
CASE 17 (EXP) L17=L15+L16 (without friction)

Explain
Hydro Test Case

Case1: Hydro Test case, none-friction with WW=Water Filled Weight, HP=Hydro Pressure

Operation Case

Case2: Operating case with friction at operating temperature (T1=80°C), 3 pumps working
Case3: Operating case none-friction at operating temperature (T1=80°C), 3 pumps working
Case4: Operating case with friction, pumpA and pumpB working (T2=80°C), pump C standby (T2=21°C)
Case5: Operating case with friction, pumpA and pumpC working (T3=80°C), pump B standby (T3=21°C)
Case6: Operating case with friction, pumpB and pumpC working (T4=80°C), pump A standby (T4=21°C)
Case7: Operating case none-friction at TAMIN = 16°C ( For Stress Range Purpose ), 3 pumps at T5=16°C

Sustain Case

Case8: Sustain case with friction
Case9: Sustain case none- friction

Occational Case

Case10: Seismic Load ( X direction), none- friction
Case11: Seismic Load ( Z direction), none- friction
Case12: Seismic Load combined, none- friction
Case13: Sustain Case + Occational due to seismic, none- friction

Expansion Case

Case14:Expansion Case check with friction at operating temperature (T1=80°C)
Case15:Expansion Case check none- friction at operating temperature (T1=80°C)
This is stress check at maximum temperature, none- friction
Case16:Expansion Case check none- friction at mininum temperature (T5=16°C)
This is stress check at maximum temperature, none- friction
Case17:This case for stress range purpose, none- friction
[ minimum stress check(case16)+maximum stress check(case15)]

Please click link below to see videos about above tutorials
http://www.azpiping.com/tutorials/temperature-3pumps.htm
http://www.azpiping.com/tutorials/loads-3pumps.htm

When most people think of Information Needed for Pipe Stress-Analysis, what comes to mind is usually basic information that’s not particularly interesting or beneficial. But there’s a lot more to Information Needed for Pipe Stress-Analysis than just the basics.
Here they are

1. Outside diameter of piping, wall thickness (or nominal diameter, schedule number)

2. Temperature, internal pressure

3. Material of piping. (Expansion coeffcient, Young’s modulus, and

material density will be selected for this material.)

4. Insulation thickness and insulation material. (If not given, standard

thickness for calcium silicate will be selected.)

5. Specifc gravity of contents

6. Any wind load to be considered? If yes, the direction of application

is important.

7. Any anchor initial translation. (For towers, exchangers, and so on, nozzle initial

ranslation is important.)

8. Corrosion allowance for piping

9. Flange rating, (ANSI B16.5)
10. Standard valve weight and fange weight will be used. (For special valves mark the weight on pipe stress

isometric.)

11. Long radius elbows will be used. (If short radius or any other bend

radius, mark on the isometric.) For short-radius elbow, radius= diameter

12. Any allowable loading from manufacturers on pumps, turbines,

compressors? (From the vendor drawing for equipment.)
13. Any preference to use expansion loops, expansion joints, and so on,

if needed?

14. Mark type of intersection (reinforced fabricated tee, etc.)

15. Mark support locations (available steel crossing, and so on) on the

isometric

16. Is hydraulic testing load condition to be considered to get structural

support loads?

 17. Pipe stress isometrics (x-, y-, z-axis) piping plans, and sections are

necessary.

Reference

-Experienced in piping stress analysis using Caesar II

-Introduction to pipe stress analysis book, by Sam Kannappan, P.E. Engineer

Before you start piping stress calculation, you have to refer to line index ( or called the line classification lists or process line lists) to check design temperature and an operating temperature for line to be checked.Stress analysis shall be carried out on the basis of the design temperature.

Secondly, you have to know requirements base on your project specification such as

Minimum Ambient Temperature. ( TAMIN )

Maximum Ambient Temperature. ( TAMAX )

Maximum Solar Radiation Temperature. ( TS )

Site Installation Temperature. (TAs )

We will use value below in our piping stress analysis tutorials:

TAMIN = 16°C ( For Stress Range Purpose, in case hot lines)

TAMAX = 36°C ( For Stress Range Purpose , incase cold lines )

TS = 70°C

TAs = 21°C

Line design temperature shall be taken from process line lists ( or line index).

In case plus design temperatures <70°C , 70°C will be taken as design temperature

Example 1:

Line design temperature as per line index is 65°C so we will take 70°C as design temperature for stress calculation

TAMIN = 16°C ( For Stress Range Purpose )

TAs = 21°C

Example 2:

Line design temperature as per line index is -250°C so we will take -250°C as design temperature for stress calculation

TAMAX = 36°C ( For Stress Range Purpose with )

TAs = 21°C

Noted:

TAMIN= 16°C in example 1 ( for hot line) and TAMAX = 36°C in example 2 ( for cold line)
You have to find Minimum Ambient Temperature, Maximum Ambient Temperature, Maximum Solar Radiation Temperature, Site Installation Temperature in your project specifications

Here are some guidelines for Piping Engineer when we make the Piping Material Specification

The following article presents the very latest information you need to when making Reducer, Nipple, Coupling, Plug, Cap discription in piping material specification.