Many quotations say “EOT crane as per IS 3177”. But what does an IS 3177 compliant EOT crane really mean? And how can a plant head or purchase manager check it before signing the order?
This guide explains the main Indian crane standards in simple words. It also gives a short checklist of documents and tests to ask for. It is written for buyers in steel, cement, power, automobile, pharma, FMCG and warehouse projects, where a crane must run safely for many years.
1. The two standards every EOT crane buyer should know
IS 3177:2020 – Electric Overhead Travelling Crane and Gantry Crane for all Applications: Code of Practice (Third Revision). This is the main Indian code for EOT and gantry cranes. It covers design, manufacture, inspection and testing of the complete crane – structure, mechanisms and electricals.
IS 807 – Design, Erection and Testing (Structural Portion) of Cranes and Hoists: Code of Practice. This code covers the steel structure: girders, end carriages, load combinations, stresses, fatigue and deflection. IS 3177 points to IS 807 for the structural design.
Other standards often used with them:
- IS 3938 – electric wire rope hoists.
- IS 2266 – steel wire ropes for general engineering use.
- IS 15560 / IS 3815 – crane hooks, as named in your specification.
- IS/IEC 60034 – electric motors, and IS/IEC 60947 – switchgear and controlgear.
A good supplier lists every standard used in the technical proposal, with the year of the edition. If a quotation only says “as per IS” with no number or year, ask for the full list.
2. What “compliant” really means
A crane is compliant when the design, the parts, the tests and the papers all follow the code. In simple terms, an IS 3177 compliant EOT crane has:
- The right classification for the crane and each mechanism (hoist, cross travel, long travel), based on how often they run and how heavy the usual loads are.
- Design calculations that match that class – girder, wheels, rope, drum, gears and motors sized for the class, not just for the safe working load.
- Approved materials and bought-out parts with test certificates.
- Stage-wise inspection during manufacture, as per an agreed Quality Assurance Plan (QAP).
- Tests at works and at site, including the overload test, with signed records.
- A full document file handed over with the crane.
If any one of these is missing, the crane may still lift – but you cannot prove it is safe, and it may wear out much faster than you expect.
3. Classification: the most important line in the specification
The classification decides almost everything about the crane: rope size, wheel size, gear life, motor rating and girder fatigue design. IS 3177 and IS 807 follow the ISO 4301 method. Each mechanism gets a class from M1 (very light use) to M8 (very heavy, continuous use), based on the class of utilisation (running hours over its design life) and the load spectrum (how often it lifts close to full load).
| Typical use | Load pattern | Usual mechanism class |
|---|---|---|
| Maintenance crane in pump house or turbine hall | Rare use, often near full load | M3 – M4 |
| General workshop, assembly bay, warehouse | Regular use, mixed loads | M4 – M5 |
| Fabrication shop, cement plant, production line | Daily use, many lifts per hour | M5 – M6 |
| Steel melt shop, ladle handling, scrap yard, grab duty | Continuous use, heavy loads, high heat | M7 – M8 |
Why this matters: two cranes may both say “10 ton, 20 m span”. One is designed for M3, the other for M6. The M6 crane has a bigger rope, larger wheels, stronger gears and a higher motor rating. In a production bay it lasts many times longer, with much less downtime. Comparing them as “the same crane” is the most common buying mistake.
4. Structural design as per IS 807
- Dead load of girders, trolley and platforms.
- Live load – safe working load plus hook block – multiplied by a dynamic (impact) factor.
- Horizontal forces from acceleration, braking and crabbing of the crane.
- Fatigue, based on the class of the crane and the number of stress cycles.
- Deflection – many plant specifications ask for span/750 to span/1000 under full load, depending on class and use.
What to ask for: the structural design calculation sheet, signed by the design engineer, showing these checks for your crane.
5. Safety devices you should expect
- Hoist upper and lower limit switches, with a separate rotary or gravity-type final limit.
- Long travel and cross travel limit switches, plus end stoppers and buffers.
- Overload protection (load cell or load limiter).
- Electro-hydraulic thruster or electromagnetic brakes on every motion, rated for the duty.
- Emergency stop on the pendant or remote, and a main isolator.
- Anti-collision devices where two cranes run on the same gantry.
- Warning siren and lights for travel motions.
- Proper earthing, guards on moving parts, and walkways with handrails.
In India, crane safety at work is also governed by the Occupational Safety, Health and Working Conditions Code, 2020 (OSH Code) and State rules, which need periodic examination of lifting machines by a competent person. Clear test records make these audits simple.
6. Testing: what the code expects
| Stage | Test | What it proves |
|---|---|---|
| During manufacture | Material test certificates, weld inspection (visual, DP / UT as per QAP), dimensional checks | Correct material and good fabrication |
| At works | No-load run of all motions, gearbox run test, panel testing | Mechanisms and electricals work before dispatch |
| At site | Deflection test at rated load | Girder stiffness is within limit |
| At site | Overload test at 125% of safe working load | Structure, brakes and mechanisms hold the overload safely |
| At site | Running test at rated load, all motions, all speeds | Speeds, brakes and limits work under real load |
Every test must be recorded on a signed test certificate with the date, load used, readings and names of the people who witnessed it.
7. The document file you should receive
- GA (General Arrangement) drawing with key dimensions, clearances and wheel loads.
- Design calculations – structure as per IS 807, mechanisms as per IS 3177.
- Quality Assurance Plan (QAP) and filled inspection records.
- Material and bought-out test certificates – rope, hook, motors, brakes, gearboxes, panel.
- Load test certificate (deflection and 125% overload).
- Electrical drawings – power and control circuit, panel layout.
- Operation and maintenance manual with lubrication chart and recommended spares list.
- Warranty certificate and service contact details.
8. Quick buyer checklist before you place the order
- Which edition of IS 3177 and IS 807 is the crane designed to?
- What is the class of each mechanism, and how was it decided?
- Can I see the structural calculation and deflection value for my span?
- Which make and rating are the motors, brakes, gearboxes and panel?
- What rope construction and safety factor are used?
- Which safety devices are included as standard?
- Is there a QAP, and can my team witness stage inspection?
- How is the 125% overload test done at site, and who signs it?
- What documents come with the crane?
- What is the after-sales support – AMC, spares stock and response time?
9. How R K Engineering Works approaches IS 3177 compliance
R K ENGINEERING WORKS has designed and built EOT cranes, gantry cranes, hoists and goods lifts in Jaipur since 1998. We are ISO 9001, ISO 14001 and ISO 45001 certified. For every EOT crane: site study, classification and design to IS 807 and IS 3177, GA drawing and QAP approval before manufacture, stage inspection at our VKI Area works, installation and 125% load test with the full document file, and lifetime support through AMC, spares and modernisation.
See our EOT crane range, our guide to cranes for cement plants and the industries we serve. Planning a new crane or checking an existing one against IS 3177? Request an engineering consultation or book a site survey, and share your company name, industry, capacity (ton), span, lift height, duty and project timeline.
Frequently asked questions
What is IS 3177?
IS 3177:2020 is the Indian Standard code of practice for electric overhead travelling (EOT) cranes and gantry cranes for all applications. It covers design, manufacture, inspection and testing of the crane.
What is the difference between IS 3177 and IS 807?
IS 3177 covers the complete crane – mechanisms, electricals, inspection and testing. IS 807 covers the design, erection and testing of the steel structure. A compliant EOT crane follows both.
Which class of EOT crane do I need?
It depends on running hours and how often the crane lifts near full load. Maintenance cranes are often M3-M4, workshops M4-M5, production bays M5-M6 and steel melt shops M7-M8. An engineer should confirm the class after a site study.
What load test is done on a new EOT crane?
At site, the crane is tested for deflection at rated load, then given an overload test at 125% of its safe working load, and a running test at rated load in all motions, all on a signed test certificate.