diff --git a/pipeline_integrity/method/asme/b31g_2012.py b/pipeline_integrity/method/asme/b31g_2012.py
index 93a0b7f..f3727f4 100644
--- a/pipeline_integrity/method/asme/b31g_2012.py
+++ b/pipeline_integrity/method/asme/b31g_2012.py
@@ -112,12 +112,8 @@ def get_stress_fail(self):
                 "(1 - 2/3 * (depth / wallthickness) / M).",
                 self
               ),
-              '\n', "stress_fail = {} * (1 - 2/3 * ({} / {})) / (1 - 2/3 * ({} / {} / {})) = {}.".format(
-                round(s_f, EXPL_ROUND),
-                round(self.anomaly.depth, EXPL_ROUND), round(self.anomaly.pipe.wallthickness, EXPL_ROUND),
-                round(self.anomaly.depth, EXPL_ROUND), round(self.anomaly.pipe.wallthickness, EXPL_ROUND),
-                round(m_val, EXPL_ROUND), round(s_p, EXPL_ROUND),
-              ),
+
+              '\n',  self.explain_stress_fail(s_f, m_val, s_p),
             ])
 
             return s_p
@@ -137,6 +133,18 @@ def get_stress_fail(self):
 
         return s_p
 
+    def explain_stress_fail(self, s_f, m_val, s_p):
+        """Return text that explain stress_fail calculation."""
+        return "stress_fail = {} * (1 - 0.85 * ({} / {})) / (1 - 0.85 * ({} / {}) / {}) = {}.".format(
+            round(s_f, EXPL_ROUND),
+            round(self.anomaly.depth, EXPL_ROUND),
+            round(self.anomaly.pipe.wallthickness, EXPL_ROUND),
+            round(self.anomaly.depth, EXPL_ROUND),
+            round(self.anomaly.pipe.wallthickness, EXPL_ROUND),
+            round(m_val, EXPL_ROUND),
+            round(s_p, EXPL_ROUND),
+        )
+
     def get_stress_fail_mod(self):
         """Return estimated failure stress level by modified method."""
         self.add_explain([
@@ -178,15 +186,7 @@ def get_stress_fail_mod(self):
             "(1 - 0.85 * (depth / wallthickness) / M).",
             self
           ),
-          '\n', "stress_fail = {} * (1 - 0.85 * ({} / {})) / (1 - 0.85 * ({} / {}) / {}) = {}.".format(
-            round(s_f, EXPL_ROUND),
-            round(self.anomaly.depth, EXPL_ROUND),
-            round(self.anomaly.pipe.wallthickness, EXPL_ROUND),
-            round(self.anomaly.depth, EXPL_ROUND),
-            round(self.anomaly.pipe.wallthickness, EXPL_ROUND),
-            round(m_val, EXPL_ROUND),
-            round(s_p, EXPL_ROUND),
-          ),
+          '\n', self.explain_stress_fail(s_f, m_val, s_p),
         ])
 
         return s_p