Activity 3 – 5 Whys: Leak in a Chemical Reactor at ABC Chemicals
Scenario
At ABC Chemicals, a manufacturer of specialty chemicals for the agricultural sector, a critical
situation has arisen with one of their chemical reactors. This reactor, essential for synthesizing a
popular pesticide, has begun leaking during operations. The reactor itself is a 10,000-liter
stainless steel vessel, about eight years old and last inspected two years prior. It operates under
high pressure and temperature, conditions under which the operators have observed a slow drip
from a lower valve, a symptom that worsens with increased reactor pressure. The workforce at
the plant is highly skilled yet aging, and recent budget cuts have led to inconsistent training on
both new and existing equipment. Although the reactor is scheduled for annual inspections and
pressure tests, the last maintenance session was skipped to accommodate a 20% increase in
production output, a change implemented six months ago to meet rising market demand. This
has added significant operational stress to the reactor, exacerbating the leakage issue and
highlighting serious safety, environmental, and production concerns.
Questions
1. Based on the scenario, construct the questions and answers based on the 5-Whys root
cause analysis methods.
2. List 3 recommendations that could improve and overcome the issues.
ANSWER
(1) Problem statement: The chemical reactor at ABC Chemicals starts to leak during
operations due to a faulty lower valve, skipped maintenance, budget cuts, and increased
production pressure. This leakage issue poses serious safety, environmental and
operational risks.
Question
Why 1: Why is the chemical
reactor
leaking
during
operations?
Why 2: Why is the lower
valve
dripping
under
pressure?
Why 3: Why was the valve
seal not replaced or
maintained?
Why
4:
Why
was
maintenance
skipped
despite the reactor’s critical
role?
Answer
Root Cause Identified
The lower valve is dripping Valve failure or degradation.
under high pressure.
The valve seal is worn out or Degraded seal due to lack of
damaged.
maintenance.
The
last
maintenance
session was skipped to
increase production output.
Budget
cuts
to
accommodate
a
20%
increase in production
output to meet rising market
demand.
Why 5: Why were budget ABC Chemicals do not have
cuts implemented without enough
amount
of
considering maintenance resources
for
serious
needs?
maintenance,
training
worker
and
inspection
session.
Maintenance deferred due
to production pressure.
Short-term
decisions
safety.
financial
compromising
Poor risk management and
lack of balance between
production
and
maintenance.
(2) List 3 recommendations that could improve and overcome the issues.
1. Reinforce Preventive Maintenance with Strict Compliance and Risk-Based
Prioritization
a. Re-establish mandatory maintenance schedules, such as annual inspections and
valve checks, with zero tolerance for skipping and ensure strict compliance with
scheduled inspections and maintenance despite productive demands.
b. Use predictive maintenance tools such as vibration sensors and thermal imaging to
detect early wear.
2. Overhaul Training Programs and Knowledge Transfer for Aging Workforce
a. Conduct monthly safety and equipment training with competency assessments for
all technicians or workers.
b. Addressing workforce aging requires guiding younger staff in a structured mentorship
program to transfer knowledge.
3. Revise Budget/Production Policies to Balance Output and Safety
a. Guarantee a minimum budget for maintenance that cannot be cut, even during busy
periods.
b. Reward managers for both production and safety, such as bonuses for zero leaks, ontime deliveries, or hitting production targets.