Procurement

How to Write a Crane Procurement Specification That Protects Your Plant for 20 Years

A step-by-step guide for EPC engineers and procurement managers: what to include in an EOT or overhead crane RFQ specification, common omissions that cause post-delivery disputes, and the clauses that matter most.

12 min readHoistMarket Editorial5 May 2026

Why Most Crane Specifications Fail to Protect the Buyer

A procurement specification is a legal document that defines what you are buying. A weak specification transfers risk from the vendor to the buyer — and most EOT crane specifications are weak.

The typical pattern: a plant engineering team downloads a generic crane specification from a past project, updates the capacity and span, and issues it to market. The crane is delivered. Then:

The runway rail is a different profile than the plant's existing infrastructure
The hoist speed is slower than the production process requires
The control system uses a proprietary PLC with no local support
The electrical panel board is rated for a different supply voltage than on site
The clearance between the crane and the building column is 40mm instead of the 100mm minimum

Every one of these problems is a specification omission. Every one of them causes post-delivery disputes, modification costs, and production delays.

This guide provides a complete specification framework for EOT cranes — the minimum content that protects the buyer across a 20-year equipment lifecycle.

Section 1: Scope and Applicable Standards

The specification must clearly state:

Equipment description: e.g., "One (1) Electric Overhead Travelling (EOT) Double Girder Crane, top-running configuration"

Quantity, capacity (SWL), and span

Governing standards: Do not leave this ambiguous. State explicitly:

Standard	Coverage	Recommended Clause Language

IS 3177 / IS 807	Design and erection (India)	"Designed and manufactured to IS 3177 latest edition"
FEM 1.001	Classification (European OEMs)	"Classified to FEM 1.001 mechanism and crane groups as specified"
ASME B30.2	Safety standard (GCC/US projects)	"Inspection and operation to comply with ASME B30.2 latest edition"
IS 13947 / IEC 60947	Electrical components	"All electrical components to IS 13947 / IEC 60947 as applicable"

Critical: State which standard governs in case of conflict. e.g., "In case of conflict between standards, the more conservative requirement shall govern."

Section 2: Service Conditions and Duty Classification

This section is most frequently underspecified.

Required parameters:

Parameter	What to Specify	Common Omission

FEM mechanism group	M3, M4, M5, M6, etc.	Left blank — vendor defaults to lightest class
Operating hours per day	e.g., "8 hours / day, two-shift"	Not stated — vendor assumes one-shift
Lifts per hour (average and peak)	e.g., "12 avg / 20 peak per hour"	Never specified — critical for hoist drum sizing
Average load per lift	e.g., "75% of SWL average"	Not stated — vendor assumes light
Ambient temperature range	e.g., "10°C to 48°C"	Only maximum stated; minimum affects lubrication selection
Relative humidity range	e.g., "Up to 95% RH non-condensing"	Omitted — affects motor and panel IP rating
Corrosive environment	e.g., "Mild acid fumes; coastal salt spray"	Left as "general industrial" — results in wrong paint spec and sealing class
Altitude above sea level	e.g., "850m ASL"	Omitted — affects motor derating and VFD selection

FEM classification must be derived from your actual process, not estimated. Underspecification is vendor-friendly and buyer-damaging. If you operate two-shift in a process plant with 12+ lifts per hour at 80%+ of rated load: this is FEM M5 or M6. Specify it.

Section 3: Structural Specification

Bridge and Girder

Bridge type: Single girder (for ≤10t, ≤20m span typically) or double girder (for higher capacity/span)

Girder fabrication: Welded box section; minimum plate thickness (do not accept 6mm plate for main girder flanges on duty cranes)
Camber: Pre-cambered upward to compensate for dead load deflection and partial live load sag. State required camber value or refer to IS 807 deflection limits.
Deflection limit under full load: IS 807 requires L/888 for EOT cranes (L = span). State this explicitly.
End carriages: Type (box or fabricated); wheel arrangement; minimum wheel diameter
Wheel material and hardness: e.g., "Forged, heat-treated, minimum 300 BHN"

Runway

Specify the rail profile (e.g., "ISMC 150 rail on IS 808 channel" or "DIN 536 rail")
Specify whether vendor is supplying runway or buyer-furnished
Require that the OEM confirm runway stiffener and joint spacing compatibility
Require wheel load diagram (maximum static and dynamic wheel loads) at tendering stage

Section 4: Hoist Unit Specification

The hoist is the highest-wear component. Under-specification here causes the most maintenance problems.

Parameter	Specification Item

Hoist type	Wire rope or chain (see selection guide)
Hoist capacity	Equal to crane SWL; state whether load includes hook block weight
Hoist speed	Specify lifting speed in m/min; state whether VFD required
Micro-speed	Required yes/no; if yes, state minimum inching speed (e.g., 0.5 m/min)
Drum	Grooving profile; number of rope layers; rope end attachment type
Wire rope	Construction, diameter, IWRC, minimum breaking force; require rope test certificate
Hook block	Swivel, safety latch, rated WLL, number of sheaves; require weighing device if applicable
Hoist motor	Rated power, duty class (S3-40% min for M4+; S4 for M6+), inverter-duty winding if VFD
Hoist brake	Spring-applied, electrically released; minimum braking torque; require brake test results
Rope end connection	Wedge socket or spelter socket; not U-bolt clamps

Section 5: Travel Drives

Long Travel (Bridge Drive)

Drive arrangement: End carriage drives with one motor per drive wheel group (preferred for balanced loading) or centre-drive via shaft
Speed: State m/min; state whether VFD required (strongly recommended for controlled acceleration)
Minimum traction on slope: If floor is sloped, state maximum gradient and require traction analysis

Cross Travel (Crab/Trolley Drive)

Speed: State m/min for cross travel
Crab frame type: Box frame or open frame; state whether separate crab motor control or common panel
Crab rail size and profile: Must match bridge girder top flange or specify rail mounting detail

Section 6: Electrical Specification

This section has the highest rate of post-delivery disputes. Be explicit.

Electrical Item	Specification Requirement

Power supply	State exactly: "415V ±10%, 50Hz, 3-phase, 4-wire"
Main panel board	CRCA enclosure, minimum IP54; state number and rating of isolators
Control voltage	110V AC or 24V DC (state — default varies by OEM)
Motor protection	Thermistors in winding; overload relay; phase failure relay — all mandatory
Pendant control	Minimum 4-motion (hoist up/down, bridge left/right); state button layout and cable length
Radio remote control	Required or optional; state if required
End-of-travel limit switches	Hoist upper/lower, bridge end, crab end — all required; state type (rotary cam or linear)
Overload protection	Required; state whether electronic or mechanical; state trip accuracy (±5% typical)
Anti-sway	Required for precision applications; state if required
Cabling	Festoon or conductor bar; require IP protection rating for each
Earthing	Require earthing of all metallic components per IS 3043

Section 7: Clearances and Dimensional Constraints

Always provide a building dimensions drawing with the specification. State:

Hook-to-roof clearance at maximum lift: Minimum 500mm above hook to lowest overhead obstruction
Crane-to-column clearance: Minimum 100mm on each side; more if large loads are handled
Cross-travel range: Exact distance from centre to centre of runway rails; confirm equals bridge span
Long-travel range: Overall runway length; location of maintenance end stop zones
Overall crane height: For building headroom check; require OEM to confirm
Headroom (SHH): Specify required Minimum Hook Height from floor at top of lift

Section 8: Testing and Commissioning Clauses

Do not leave testing to the vendor's standard scope. Specify:

Factory Acceptance Test (FAT): Require FAT at OEM works before dispatch. What is witnessed: static load test (125% SWL), dynamic load test (100% SWL), electrical panel check. Require buyer's representative to be present.

Site Acceptance Test (SAT): After installation: no-load function test, static load test (125% SWL), dynamic load test (100% SWL). All limit switches and safety devices demonstrated.

Documentation at commissioning: Test certificate, electrical as-built drawings, maintenance manual, spare parts list, warranty certificate.

Performance demonstration: At SAT, crane must achieve specified hook height, travel speeds, and duty cycle for 2 continuous hours without fault.

Section 9: Documentation Requirements

A commonly underspecified area that creates long-term maintenance problems:

Document	Required At	Notes

General arrangement drawing (approved)	Before manufacture	Check clearances before you approve
Load flow diagram (wheel loads)	Before civil design	Input to runway beam design
Electrical schematic (as-built)	At commissioning	Laminated copy to be mounted in panel
Maintenance manual	At commissioning	Must include lubrication schedule, maintenance intervals, and adjustment procedures
Spare parts list (with OEM part numbers)	At commissioning	Minimum 2-year recommended spares list
Wire rope test certificate	At commissioning	Traceability to rope manufacturer
Weld inspection records	On request	For structural welds on main girder
Warranty certificate	At commissioning	State warranty period (minimum 12 months from commissioning)

Section 10: Warranty and After-Sales Obligation

Warranty period: Minimum 12 months from date of commissioning (not dispatch)
Response time: OEM / agent must provide on-site response within 48 hours for critical failures (define "critical" as: crane unable to operate)
Parts availability commitment: OEM must commit to supplying spare parts for minimum 10 years from commissioning date
Service technician proximity: Require OEM to confirm nearest qualified service technician location and response capability

The Pre-Issue Specification Review Checklist

Before issuing your specification to market, verify:

[ ] FEM duty class explicitly stated and justified by process data
[ ] Electrical supply voltage and frequency stated
[ ] Hoist speed (lifting) and VFD requirement stated
[ ] Building dimensions drawing attached
[ ] Required clearances stated (roof, column, obstruction)
[ ] Testing requirements (FAT and SAT) explicitly included
[ ] Required documentation list included
[ ] Warranty period and parts availability commitment required
[ ] Applicable standards stated with conflict resolution clause
[ ] Spare parts first-year package required in scope

Key Takeaways

Duty class underspecification is the most costly omission. Derive the FEM group from actual process data, not estimation.

Electrical supply details must be explicit. Voltage, frequency, and phase configuration errors cause post-delivery modification costs that equal 10–20% of purchase price.

Require clearance confirmation before manufacture approval. A drawing approval step protects you from dimensional surprises.

FAT and SAT are mandatory, not optional. If the vendor's standard scope does not include them, add them and assess the cost.

Documentation is part of the asset. An as-built electrical schematic is worth its weight in emergency maintenance hours. Require it as a commissioning condition.