REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - minimum sleeve size for insulated pipes

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REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - minimum sleeve size for pipes with insulation 

PROBLEM:

The suction line of a walk-in cooler is 5/8 inch and has an insulation of 1/2 inch. The discharge line is 3/8 inch and has 1/4 inch of  insulation. Determine the minimum required sleeve size of pipe through a concrete block exterior wall.

Given

suction line = 5/8 in.

suction line insulation = 1/2 inch

discharge line = 3/8

discharge line insulation = 1/4 inch

Unknown 

Size of sleeve

SOLUTION 

Sleeve size of pipe

= suction line 

   + ( 2 * insulation )

   + discharge line

   + ( 2 * insulation)

=  5/8 + (2 * 1/2) 

   + 3/8 + (2 * 1/4)

= 5/8 + 1 + 3/8 + 1/2

= 2  1/2  inch

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