API 570 - List of Math Equations

API 570 - Math Equations  API 570 570 Calcs Short Term Corrosion Rate tprevious - tactual CRST = # of years between t previous & tactual

Long Term Corrosion Rate tinitial - tactual CRLT = # of years between t previous & tactual

Remaining Life tactual RL =

- trequired

Corrosion-Rate

Required Thickness

Inspection Interval

Interval =

Minimum Thickness

PD

t=

2[(SE) + (PY)]

tm =

t+c

½ of RL or Table 2

API 570 - Math Equations Required Thickness

t=

Minimum Thickness

PD

tm =

2[(SE) + (PY)]

MAWP

t+c

Thermal Growth B31.3 Thermal Growth

G=

100

Blank Minimum Thickness B31.3 par 304.5.3 page 28

P=

2(SE) + (t - c)

tm_blank  = dg

D

3 16 

+c

Hydrostatic Test Pressue Test Pressure = 1.5P

FxL

St S

Pneumatic Test Pressue Test Pressure = 1.1 x P

API 570 - Math Equations B16.5 Calculations



Sub-Minimum Thickness Calcs Sm _Enclosed Circles edge-to-edge =

SmDia = .35

1.75

d x tm

d x tm

SM _Measured Thickness

= .75 x tm

Blank Minimum Thickness

tm_blank  = dg

 API 574 Calculations

3 16 

t = 1.5

MAWP  = 2

+c

Pressure Test =

 

[

PD 2[(SE)

]

How to Solve MATH equations? 

How To Break MATH Questions? 1.

What answer do I need?

2.

What will I NEED to solve equation?

3.

What is KNOWN ?

4.

What is UNKNOWN ?

5.

How do I get the UNKNOWN’s ?