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• Vijay Max

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API 570 - Math Equations API 570 Calcs Short Term Corrosion Rate tprevious - tactual

CRST = # of years between tprevious & tactual

Long Term Corrosion Rate tinitial - tactual

CRLT = # of years between tprevious & 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 B31.3 Calculations Required Thickness

t=

Minimum Thickness

PD

tm =

2[(SE) + (PY)] MAWP

P=

t+c

Thermal Growth B31.3 Thermal Growth

G=

100

Blank Minimum Thickness B31.3 par 304.5.3 page 28

2(SE) + (t - c)

tm_blank = dg

D

3𝑃 16 𝑆𝐸

+c

Hydrostatic Test Pressue St

Test Pressure = 1.5P

FxL

S

Pneumatic Test Pressue Test Pressure = 1.1 x P

API 570 - Math Equations  API 574

B16.5 Calculations

Calculations

Sub-Minimum Thickness Calcs Sm_Enclosed Circles edge-to-edge =

SmDia = .35

1.75

d x tm API 574 Valve Body Thickness

d x tm

SM_Measured Thickness

= .75 x tm

t = 1.5 Blank Minimum Thickness

tm_blank = dg

3𝑃 16 𝑆𝐸

+c

MAWP

[

PD 2[(SE)

]

𝑆𝐸𝑡 𝑀𝐴𝑊𝑃 = 2 𝐷

Pressure Test Test Pressure =

1.5 x P 3

How to Solve MATH equations?  How To Break MATH Questions? 1. 2. 3. 4. 5.

What answer do I need? What will I NEED to solve equation? What is KNOWN ? What is UNKNOWN ? How do I get the UNKNOWN’s ?

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