เปรียบเทียบ Air Compressor
Screw vs Piston vs Scroll
เครื่องอัดอากาศ — เลือกตาม CFM + duty + noise
3 technology หลักของ industrial air compressor — duty 50% vs 100% · efficiency 0.18-0.30 kW/CFM · noise 55-95 dBA · capex ฿85K-450K ตาม CFM + ISO 8573-1 air quality
สรุปสั้น — เลือกตาม CFM + duty + air quality
กฎ: 24/7 production = screw · workshop intermittent = piston · medical/food/lab oil-free quiet = scroll
Workhorse 24/7
Rotary Screw
- Continuous duty 100% — เหมาะ shop ที่ใช้ air ทั้งกะ
- VSD ลดค่าไฟ 25-40% (vs fixed-speed) — ROI 1.5-3 ปี
- Service interval 4,000 ชม. — uptime ดีกว่า piston 4-8 เท่า
- Capex สูงกว่า piston 2 เท่า + เครื่องเดียวอยู่ได้ 100,000+ ชม.
เหมาะกับ
Production plant, paint booth, CNC shop, 24/7 industrial use
Lowest capex + simple
Reciprocating Piston
- Capex ต่ำสุด — entry ฿85K สำหรับ 100 CFM
- ซ่อมในประเทศได้ — vendor service network กว้าง
- Duty 50-75% — ต้อง cool-down → ใช้ในงาน intermittent
- High pressure 30 bar+ for special apps (PET blow, breathing air)
เหมาะกับ
Workshop, garage, intermittent tool use, HP breathing air, small factory
Quietest + oil-free
Scroll
- Noise 55-68 dBA — เงียบที่สุด เหมาะติดในออฟฟิศ / lab
- Oil-free standard — Class 0 air per ISO 8573-1
- Vibration ต่ำมาก — ติดบนชั้นได้ + no isolation pad
- Limited CFM (max 30) — ขนานหลาย unit สำหรับ shop ใหญ่
เหมาะกับ
Medical, pharmaceutical, food processing, electronics lab, dental clinic
ตารางเปรียบเทียบ 14 หัวข้อ
| หัวข้อ | Screw | Piston | Scroll |
|---|---|---|---|
| Mechanism | Twin rotating helical rotors | Reciprocating piston in cylinder | Orbiting scroll meshing with fixed scroll |
| CFM range (typical) | 20-2,000+ CFM | 1-200 CFM | 0.5-30 CFM |
| Pressure range | 7-14 bar (high to 40 bar VSD) | 5-30 bar (HP industrial) | 5-10 bar |
| Duty cycle | 100% continuous | 50-75% (cool-down required) | 100% continuous |
| Efficiency (kW/CFM @ 7 bar) | 0.18-0.22 | 0.22-0.30 | 0.20-0.25 |
| Noise (dBA @ 1m) | 65-78 (enclosed) | 82-95 (loud) | 55-68 (quietest) |
| Vibration | Low (rotary balanced) | High (need isolation pad) | Very low (no piston shock) |
| Oil-free option | Yes (premium ฿+40-60%) | Yes (limited CFM) | Standard (most are oil-free) |
| Maintenance interval | 4,000 hr oil + filter | 500-1,000 hr oil + valve | 5,000-10,000 hr tip seal |
| Service life (hours) | 60,000-100,000 | 30,000-60,000 | 40,000-60,000 |
| Capex (THB / 100 CFM @ 7 bar) | ฿180K-380K | ฿85K-180K | ฿220K-450K |
| Footprint (m²) | Compact (skid-mounted) | Largest (need belt guard + cooling) | Smallest (no cooling fan large) |
| VSD energy saving | Yes — 25-40% saving (proven) | Limited (start/stop wear) | Yes — but smaller CFM market |
| Standards | ISO 1217 + ISO 8573-1 + CAGI | ASME B19.1 + ISO 1217 | ISO 1217 + Class 0 oil-free |
ราคา + efficiency อ้างอิงตลาดไทย พ.ค. 2026 · ISO 1217 (performance) · ISO 8573-1 (air quality class) · CAGI data sheet recommended สำหรับ procurement
ส่ง air demand profile → spec + ROI 5 ปี 48 ชม.
ทีม Saha รวบรวม peak CFM + average CFM + ISO 8573-1 air quality requirement + ค่าไฟ → compressor spec + dryer + filter + receiver tank sizing + payback (VSD vs fixed) + maintenance contract
เปรียบเทียบที่เกี่ยวข้อง
ตัดสินใจซื้อ — เทียบหลายมุม
อ่านตารางเปรียบเทียบที่เกี่ยวข้อง — สเปกครบ ราคาจริง พร้อมแนะนำตามงาน
FAQ
Common Questions
Q1.Screw vs piston — what's the ROI period?+
Depends on annual operating hours. Screw ฿380K vs piston ฿180K = ฿200K premium. Screw with VSD saves ~30% electricity vs piston cycling. At 100 CFM @ 7 bar × 8 hr/day × 300 days: piston uses 35 kW × 2,400 hr × ฿4.5 = ฿378K/yr. Screw VSD uses 25 kW = ฿270K/yr. **Savings ฿108K/yr → 1.9 yr payback**. Plus 60% lower service cost → ROI clearly better at > 4,000 hr/yr.
Q2.What is ISO 8573-1 Class 0 air quality?+
ISO 8573-1:2010 grades air across 3 dimensions: oil (0-X), particle (0-X), water/dewpoint (0-X). **Class 0 is stricter than Class 1** (oil < 0.01 mg/m³). Used in food, pharma, electronics, medical, lab. Class 1-2 = general industrial (paint, CNC). Class 3-4 = pneumatic tools. Class 0 requires oil-free compressor OR oil-injected + 3-stage filtration + activated carbon. Saha specs per end-use.
Q3.Old compressor still runs but burns electricity — what to do?+
3 options: (1) **Retrofit VSD** on fixed-speed screw — saves 20-30% electricity, 1-2 yr ROI (if utilization < 70%). (2) **Compressed Air Audit** — ultrasonic 40 kHz leak detection → 20-30% air loss from fixable leaks (free fix). (3) **Heat recovery** — screw compressors waste 80%+ as heat → preheat water/space heating saves more electricity. Free audit from Saha before deciding on replacement.
Q4.What size receiver tank?+
Rule of thumb: **tank gallons = CFM × 2 to 6**. 100 CFM → 200-600 gal (760-2,270 L). Intermittent pneumatic tools = lower bound. Steady process demand = upper. Larger tank → fewer compressor on/off cycles → less wear + stable pressure. **ASME pressure vessel cert + safety valve** required by Thai Industrial Ministry. ฿15K-150K depending on size + ASME stamp.
Q5.Is oil-free necessary? Can oil-injected filter the oil out?+
Depends on end-use risk. **Oil-injected + 3-stage filtration + activated carbon** → achieves Class 1 air (oil 0.01-0.1 mg/m³) sufficient for paint, general industrial, food packaging (no direct contact). **Oil-free needed for:** direct food contact, pharma, medical breathing air (Class 0), electronics, lab. Oil-free is 40-60% more capex + shorter service intervals — only choose when truly required.
Q6.Does Saha supply + install + service the full stack?+
Saha turnkey:
• **Screw (rotary):** Atlas Copco, Ingersoll Rand, Kaeser, Sullair, Hitachi — 20-2,000+ CFM
• **Piston:** Puma, Swan, Quincy — entry workshop level
• **Scroll oil-free:** Atlas Copco SF, Hitachi DSP, Anest Iwata
• **Air treatment:** dryer (refrigerated/desiccant) + 3-5 stage filters + ASME receiver tank
• **Engineering:** CFM sizing + pipe diameter + receiver + dryer dewpoint
• **Service contract:** 4,000 hr / annual / overhaul + leak audit + heat recovery
Send peak/average CFM + electricity cost + air quality class → system spec + ROI + maintenance contract in 24-48 hr.