API 576 quiz 1

Following are the causes of damaged valve seats in refinery except:

• Improper handling during maintenance and/or transport
  

• Foreign particles introduced into the valve inlet that pass through the valve when it opens
  

• Corrosion

• Leakage past the bonnet flange of a valve after it has been installed
  

Some preventative actions for spring corrosion can be found in API 576 except______

• Use spring material resistant to corrosive agent

• Use bellow to isolate spring from process fluid

• use dissimilar material of spring against the stem.

• coat spring with a corrosion-resistant coating
  

The following are examples of preventative actions for galling except:

• Correction of improper piping at the valve inlet
  

• protect guiding surfaces from corrosion and foreign particles
  

• Proper finishing of the guiding surfaces
  

• Consult the valve manufacturer if it is a manufacturing issue
  

According to API 576, improper safety valve handling can occur during:

• shipment

• maintenance

• setting of set pressure

• installation

The causes of damaged relief valve seats in refinery or chemical plant service, may include

• high inlet pressure drop

• foreign particles introduction

• corrosion

• all of the above

Choose two forms of spring failure:

• mechanical failure of the spring
  

• hardening of spring

• weakening of the spring
  

• expansion of the spring

Incorrect ________ of pressure gauges is a frequent cause of improper valve setting.

• Repairing

• calibration

• reading

• measurement

The main cause of galling is___________

• corrosion

• foreign particle

• valve chatter

• none of the above

The materials required for a pressure-relieving device in a given service is selected
by_________

• temperature

• pressure

• corrosion protection requirements

• all of the above

Rupture disks are sometimes used to protect other pressure-relieving devices from
________.

• corrosion

• erosion

• cracking

• fracture