New equipment must be designed to conform to
ISO 4413 (hydraulics) or ISO 4414 (pneumatics).
designers must comply to the actual wording of the standard):
Design for fail-safe operation,
considering all possible modes of failure.
All components shall operate within
All parts of the system shall be protected
Equipment shall incorporate an emergency stop
or emergency return control,
whichever provides maximum safety.
Emergency stops shall be
readily accessible under all conditions of working
and shall operate immediately.
Emergency stops shall not require that any actuator
Hydraulic circuits incorporating accumulators
shall automatically vent the accumulator liquid pressure
or positively isolate the accumulator
when equipment is shut off.
If an accumulator is not automatically vented,
complete information for safe servicing shall be given
on or near the accumulator in a visible location,
and duplicate information shall be provided on
the circuit diagram.
Equipment shall be designed so that
loss of electrical, pneumatic and/or hydraulic power
shall not cause a hazard.
Neither surge pressure nor loss of pressure shall
Pump inlet temperatures should not exceed 60 deg C
when maximum ambient temperatures exist.
Rotating parts shall be guarded to provide adequate
protection against hazard.
Flexible hoses shall only be used where necessary.
Their length shall be minimized and they
shall be protected from abrasion.
If failure causes a hazard,
the hose shall be restrained or shielded.
Piping shall not be used for equipment support.