What is the standard material for these manhole steps?

Cast iron conforming to Grade FG 150 as per IS 210 (Clause 3.1).

What is the proof load that a step must withstand?

The step must withstand a vertical load of 1.35 kN applied at the center of the tread for one minute without showing any permanent set or visual cracks (Clause 7.1).

What is the minimum embedment length of the step into the manhole wall?

The shank should be embedded into the masonry or concrete for a minimum length of 115 mm (Fig. 1).

Are these steps required to be galvanized?

Galvanizing is optional and should be done only if specified by the purchaser. If required, it must conform to IS 2629 (Clause 8.1).

IS 5455

: 1969

cast-iron steps for manholes

CurrentSpecializedSpecificationBIMWater Resources · Sanitary Appliances and Water Fittings

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This standard specifies the requirements for material, shape, dimensions, manufacturing, and testing of cast iron steps used to provide access into manholes. It ensures the steps are strong, durable, and safe for personnel entry and exit from drainage and sewerage systems.

cast-iron steps for manholes

Quick Reference Values

Material specificationCast iron conforming to Grade FG 150 of IS 210

Minimum width of tread130 mm

Minimum depth of tread115 mm

Minimum length of shank for embedment115 mm

Proof load test value1.35 kN applied vertically

Maximum deflection under proof load6 mm

Minimum weight of zinc coating (galvanizing)610 g/m²

Practical Notes

Ensure steps are properly embedded in the manhole wall to the specified depth of 115 mm to achieve required pull-out strength.

For corrosive environments or where specified, ensure steps are hot-dip galvanized as per Clause 8 to prevent premature rusting.

Verify the 'ISI' mark on the product as a confirmation of compliance with the standard during material procurement.