Materials; Rubber Components (Seals, Etc.); Metallic Components - Perkins 1200F Series Supplement Manual

5.2.2.1 DEF Hose recommendations
These recommendations are in addition to the mandatory requirements detailed in section 2.11,
which must be adhered to.
•
DEF lines should be routed on the cool side of the engine and kept clear of any heat
sources or hot surfaces.
•
For applications that are required to operate in cold environments it may also be necessary
to protect the DEF lines from exposure to the elements and wind chill.
•
Avoid routing lines through locations exposed to accidental damage by the operator
•
The use of P clips to retain the DEF lines is acceptable
•
Appropriate sized silicone coated and rubber coated p-clips are recommended for routing
points in close proximity to and away from the aftertreatment respectively.

5.3 Materials

Any component coming into direct contact with DEF should be constructed of stainless steel.
Aluminium is not suitable for use without special coatings and is not recommended.
Refer to 'Appendix A – Chemical Compatibility table' to see Perkins supplied components
compatibility/resistance to common chemicals/fluids. An X indicates resistance.

5.3.1 Rubber Components (Seals, etc.)

Seals and other rubber components material require compatibility with water based solutions. It may
also be considered to choose a material with high swell resistance to diesel fuel in the case of
incorrect DEF tank fill. Due to its good water sealing capability and resistance to swelling, it is
recommended to use NBR seals and O-rings when possible.

5.3.2 Metallic Components

Any components expected to be in direct contact with DEF (drain plug or valve) shall be constructed
of stainless steel. Aluminum is not suitable for use without special coatings and is not recommended.
A&I manual Publication TPD 1832 – Production issue 3.
1204F - DEF System Supplement
Page 33 of 41