Practice questions API RP 651 - Section 1 scope 10  terms    

The  purpose  of  API  recommended  Practice  651  is  to:    

Present procedures & practices for achieving effective corrosion control on aboveground storage tank bottoms through the use of cathodic protection

API  651  is  intended  to  serve  _________  to  persons  interested  in  cathodic  protection.    

Only as a guide

In  API  651,  an  aboveground  storage  tank  is  defined  as  a  stationary  container  of  greater  than  500  barrel  capacity,  usually  cylindrical  in  shape,  consisting  of  a  metallic  roof,  shell,  bottom  &  support  structure  where  more  than_______  percent  is  above  surface  grade.    

90%

An  electrode  of  an  electrochemical  cell  at  which  oxidation  (corrosion)  occurs  is  called:    

An anode

The  deterioration  of  a  material,  usually  a  metal  because  of  a  reaction  with  its  environment  is  called:    

Corrosion

A  deep  anode  ground  bed  uses  one  or  more  anodes  installed  in  a  single  vertical  hole  typically  _______  below  the  earth'  s  surface.    

50 feet or more

A  chemical  substance  containing  ions  that  migrate  in  an  electric  field  is  referred  to  as  an  electrolyte  in  API  651.  An  electrolyte  refers  to  the:    

Soil or liquid adjacent to & in contact with the bottom of an aboveground storage tank

A  _________  is  a  device  for  converting  alternating  current  to  direct  current.    

Rectifier

Current  flowing  through  paths  other  than  the  intended  circuit  is  called:    

A stray current

The  fracture  of  a  metal  by  the  combined  action  of  corrosion  &  tensile  stress  is  referred  to  as:    

Stress corrosion cracking