TEP Piping 002 Pressure Test and Flange

What is the units for pressure? (multi answers)

• Nm

• psi

• bar

• kg/cm²

Pressure test is normally performed to check for _____

• pressure gauge function

• dimension

• leak

• correct piping assembly

Flammable liquid may be used for hydrotest. True or false

• True

• False

Which of the following are flange types?

• socket weld flange

• raised face flange

• weld neck flange

• blind flange

Leak found during hydrotest on piping assembly can occur at ______ (multi answer)

• weld joint

• flanged connection

• pipe body

• threaded connection

Calculate minimum pneumatic test pressure for piping with design pressure or MAWP of 110 psi.

• 150 psi

• 121 psi

• 1100 psi

• 165 psi

Corrosion inhibitor addition for hydro test of piping may be considered to _______

• avoid pressure build up beyond that specified
  

• ensure that piping assembly will not leak at unexpected joints
  

• reduce
  the risk of pitting and microbiologically induced corrosion.

• avoid shock due to sudden rise of pressure

Visual inspection to check for leaking during piping hydro test must be made at the pressure of at least:

• Test pressure / 1.1

• Test pressure / 1.3

• Test pressure / 1.5

• Test pressure/1.0

Corrective action(s) that may be taken after finding leak on flanged joint is/are: (multi answer)

• re-tighten bolt at flanged joint or tighten with proper torque

• insert or replace gasket

• clean flange face

• seal weld the flanged joint

Water may not be suitable as a test fluid in some piping systems, such as: (multi answer)

• acid lines

• cryogenic systems

• air-drier system