EOT Crane vs Jib vs Gantry
เลือกเครนให้ถูก span + duty + WLL

**Three main factory crane types** — choose by span + duty cycle + facility layout: • **EOT (Electric Overhead Travelling Crane)** — runs on two parallel rails mounted on columns 6-12 m up, hoist on a trolley that traverses bridge across the rails. **Span 5-30 m**, WLL 1-200 tonne. Price ฿650K - ฿8.5M per unit (varies by tonnage + span) • **Jib crane** — single column with rotating arm 360° (free-standing) or 180° (wall-mount). **Reach 2-6 m**, WLL 0.5-10 tonne. Workstation/machine loading. Price ฿85K - ฿650K • **Gantry crane** — like EOT but **doesn't need building columns** — has its own legs + wheels. Span 8-50 m. **Mobile** (rubber tyre) or rail-mounted. WLL 5-1,000 tonne. Outdoor yards, container terminals, shipyards. Price ฿1.2M - ฿35M **Rule:** Whole-factory coverage + high capacity → EOT. Point workstation + budget → Jib. Outdoor / yard / very high capacity → Gantry

ISO 4301-1 classifies cranes by **load spectrum** (K) + **operating cycles** (U): • **A1 (light)** — rare use, < 1,600 cycles/yr, K3 (mostly light loads). E.g. powerhouse maintenance crane • **A2 (light-moderate)** — 1,600-6,300 cycles/yr, mixed. Workshop, manual production • **A3 (moderate)** — 6,300-12,500 cycles/yr. Standard machine shop • **A4 (moderate-heavy)** — 12,500-25,000 cycles/yr, K2/K3 loads. Steel warehouse, manufacturing assembly • **A5 (heavy)** — 25,000-50,000 cycles/yr, K2 loads. Foundry support, frequent use • **A6 (heavy continuous)** — 50,000-100,000 cycles/yr. Automated foundry, steel mill billet handling • **A7 (very heavy)** — 100,000-200,000 cycles/yr, K1/K2 loads. Scrap yard, port handling • **A8 (continuous severe duty)** — > 200,000 cycles/yr. 24/7 automated container handling **Select:** maintenance crane = A1-A3. Production crane = A4-A5. Foundry/port = A6-A8. **Wrong A4 selection → motor burnout in 2-3 yr / structural fatigue crack**

**WLL (Working Load Limit)** = **maximum permissible operating load** = old SWL (Safe Working Load) — same meaning, different name: • **WLL** — international standard term (ISO 4301-1, ASME B30.2, EN 13001). Designed + tested limit • **SWL** — older term (UK, Australia) — ISO 18626:2008 replaced with WLL globally. Still appears in pre-2008 documents • **Capacity** — marketing term, not a standard. "10-ton crane" means WLL 10 t • **Proof Load** = WLL × 1.25 (test load at commissioning + annual inspection) • **Ultimate Load** = WLL × 4 to 5 (design safety factor) **Thai government TORs** mostly use **WLL** or **น้ำหนักยกสูงสุด**. Thailand's Occupational Safety Act B.E. 2554 + Labour Department announcement (B.E. 2563) mandates WLL + annual proof load test certificate at 1.25× WLL

**Documentation matrix for Thai government TORs:** • **CE Marking (EU Machinery Directive 2006/42/EC)** — for European imports. Covers **EN 13001 (crane safety), EN 14492-2 (winches), EN 15011 (gantry/bridge crane)**. **Requires Declaration of Conformity + Technical File**. Gold standard — high value in TOR scoring • **TIS 1196-2541** — Thai Industrial Standard for overhead cranes. **Required for Thai manufacture** (factory must hold TISI cert) • **ISO 9001:2015** — manufacturer's Quality Management System. **Required for major TORs** (SRT, EGAT, petrochem) — accredited body cert (BSI, TÜV, DNV, BV) • **ASME B30.2 (USA)** or **AS 1418.18 (Australia)** — alternative to CE for USA + Australian markets • **GS Mark (Germany)** — additional voluntary cert from TÜV. Equivalent TOR value to CE **Rule:** Thai manufacture → minimum TIS 1196 + ISO 9001. EU import → CE + ISO. Premium spec → all of CE + GS + ISO + TIS (Konecranes / Demag / KITO)

Saha sources cranes + installs + services via a 5+ year engineering partner: • **EOT crane** — Konecranes (Finland), Demag (Germany), GH Cranes (Spain), Stahl (Germany) for heavy-duty A5-A8. KITO (Japan), Black Bear (China) for A1-A4. Price ฿650K-8.5M per unit, WLL 5-50 tonne span 10-25 m • **Jib crane** — local fabrication + imported KITO/Hadef hoist. Price ฿85K-650K standard WLL 1-5 tonne reach 3-5 m • **Gantry crane** — Konecranes RTG/RMG (container yard), locally-fabricated rail-mounted (small yard ≤ 30 tonne) • **Installation + commissioning** — partner electrical/mechanical contractor SSPC-certified + factory inspector (วฟ.). Crane structural analysis + foundation design + ASME B30.2 commissioning test at 1.25× WLL • **Annual maintenance + proof load test** — per Thai Safety Act B.E. 2554. 24-hour response service in Bangkok metropolitan area **Quote request:** specify required WLL + span + duty class A1-A8 + indoor/outdoor + ceiling height → 2-3 brand spec sheet + drawing + foundation requirement + budget + 12-20 week lead time within 7 days