The Most Important FM KPI That Never Appears on Any Dashboard In Facilities Management, we measure almost everything Response time Equipment uptime Energy consumption Maintenance backlog Cost per square feet Vendor SLAs These KPIs are important. They help us track operational performance and efficiency Based on my decades of experience in facility operations, projects and infrastructure management, I can confidently say this: The single biggest factor that determines whether an FM operation succeeds or struggles is rarely measured That factor is COLLABORATION Facilities management sits at the center of an organization’s ecosystem. Every major FM decision touch multiple stakeholder: • Operations • HR • IT • Finance • Security • HSE • Project teams • Landlords • Vendors and service partners When these groups are aligned, projects move smoothly When they are not, even the best technical plan starts to fail I have personally seen projects with perfect engineering design an...
Medical Gas Systems – From Basics to Professional Design
🔷 Part 7 – Medical Vacuum System (Real Calculation & Case Study)
This post is different.
No theory…
Only Real Engineering Thinking.
* MANY ENGINEERS GO TO THIS WAY FOR DESIGN THE VACUUM FLOW RATE.
🔹 📊 Project Example
Hospital with:
• ICU → 10 Beds
• Operating Rooms → 4
• Wards → 20 Beds
🔹 Step 1: Estimate Vacuum Points
Assume:
• ICU → 2 points/bed → 20 points
• OR → 3 points/room → 12 points
• Wards → 1 point/bed → 20 points
👉 Total = 52 Vacuum Points
🔹 Step 2: Estimate Flow
Typical design assumption:
✔ 40–60 L/min per active outlet
Assume average:
👉 50 L/min
🔹 Step 3: Apply Diversity Factor
(Not all outlets operate at the same time)
Typical:
• ICU → High usage
• OR → Medium
• Wards → Low
👉 Assume Diversity = 0.4
🔹 Step 4: Calculate Required Capacity
Required Flow:
52 × 50 × 0.4 =
👉 1040 L/min
🔹 Final Design Decision
✔ Select vacuum pumps based on:
👉 ~1040 L/min total demand
✔ Apply redundancy:
👉 (Duty + Standby + Assist)
* BUT THIS WAY IS WRONG !!!!!!!!
THE RIGHT WAY IS THE FOLLOWING:
🏥 Medical Gas Systems – From Basics to Professional Design
🔷 Part 7 – Medical Vacuum System (Real Calculation Based on HTM 02-01)
This post is different.
No assumptions.
No average diversity.
Only code-based calculation (HTM 02-01).
🔹 📊 Project Case
Hospital with:
• ICU →10 Beds
• Wards → 20 Beds
• Operating Rooms → 4
🔹 📖 Calculation Method (According to HTM 02-01)
Instead of using a fixed diversity factor, HTM 02-01 provides equations to calculate demand based on number of outlets:
👉 General form:
Q = Base Flow + (n – 1) × Incremental Flow
🔹 1️⃣ Wards (20 Beds)
Q = 40 + (19 × 10)
👉 Q = 230 L/min
🔹 2️⃣ ICU (Critical Care – 10 Beds )
10 Beds x2= 20 Out let
Q = 40 + (19 × 10)
👉 Q = 230 L/min
🔹 3️⃣ Operating Rooms (4 Rooms)
Including the following:
Anesthetic
Surgeon
Operation Suite
Q = 80 + (3 × 40)
👉 Q = 200 L/min
🔹 ✅ Total Required Vacuum Flow
👉 Q total = 230 + 230 + 200 = 660 L/min
🔹 Final Design Decision
✔ Select vacuum pumps based on:
👉 ~660 L/min total demand
✔ Apply redundancy:
👉 (Duty + Standby + Assist)
🔹 ⚙ Engineering Insight (Very Important)
HTM does NOT rely on:
❌ Fixed diversity factor (like 0.4)
❌ Full load assumption
✔ Instead, it uses progressive demand equations
which already include real usage diversity
🔹 ⚠ Real Design Mistake
Many engineers:
❌ Use average diversity
❌ Or assume all outlets working
👉 Result:
• Oversized systems
• Higher cost
• Inefficient operation
🔹 🔥 Key Lesson
Accurate medical gas design is not about assumptions…
It is about following the code correctly.
📌 In the next post:
🔷 AGSS System – The Hidden Safety System in Operating Rooms
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