- Length of one rod from each diameter is to be measured and written in Stock Register.

- Weight of rods vary from the standard weight.

- Calculating the weight of steel based on the sample unit weight is necessary to avoid manipulation by the Supplier.

- This actual weight of steel is required for the periodical Reconciliation of Steel.

**Say, for example**

**100 MT of 16mm Ø bars of Fe500 grade are required to procure. Assume the weight of bar received is 1.63 kg/Rm.**

**⇒ Total Weight of Steel received = 100,000 kg**

**⇒ Standard Weight of Steel = 1.58 kg/m**

**⇒ ∴ Length of Steel received = 100,000 / 1.63 = 61,349.693 m**

**⇒ But the length of Steel as per Standard weight = 100,000 / 1.58 = 63,291.139 m**

**⇒ Loss of Weight = ( 1.63 – 1.58 ) / 1.58 = 3.16 %**

**This is the Rolling Margin in Reinforcement Steel.**

**The Allowable deviation in Rolling Margin in R/f Steel ( IS 1786 ) :**

**8 mm to 10 mm : ± 7.0 %**

**12 mm to 16 mm : ± 5.0 %**

**20 mm & above : ± 3.0 %**

**⇒ Weight computed by measurement & Standard weight**

** = 61,349.693 x 1.58 = 96,932.50 kg**

**⇒ Loss of Weight = 100,000 – 96,932.50 = 3067.50 kg**

How can this reconciliation be done by using ‘assumed value’ ie 1.63kg/m ? Means on site I want to this….why would I assume to calculate deviation….it will change as per our assumption.

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U don’t hav to assume the value. Instead u can consider by cutting a rod by 1 metre and noting down itz respective weight. OR u can know itz value by weighing the rods by weigh bridge. After u know the tonnage, u also hv the length of the rod n the total numbers from the supplier receipt slip. Through diz, thus u can calculate the weight in kg/m.

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