NABCB Accredited Inspection Bodies
MITRA S. K. Pvt. Ltd.
Address Shrachi Centre (5th Floor),74B, Acharya Jagadish Chandra Bose Road, Kolkata - 700016, India
Contact Person Ms. Mili Das
Designation Quality Manager
Tel +91 33 4014 3000 / 2265 0006 / 2265 0007 0124-2386533
Fax +91 33 2265 0008 0124-2386533
Email ID
Accreditation Cert. No.. IB 066
Valid From 06 January 2020
Valid Upto 05 January 2027
Accreditation Standard ISO/IEC 17020:2012
Type of Inspection Body Type A
Scopes of Accreditation

Field of Inspection

Type and Range of Inspection

Standards / Regulations / Methods / Procedures

Number identification with year of publication


IAF Scope 02
Coal & Coke

Inspection of cargo at vessel, rake, truck, barges, conveyor, stationary stockpile before / during / after loading & Unloading.

As per customer's requirements in the form of Work Order

Sampling and Sample preparation

ASTM D2234/D2234M-17

ASTM D346/D346M-11

ISO 18283 :2006

IS: 436 (Part 1 / Sec-1) - 1964, RA 2019

ASTM D2013 /D2013M - 18

Doc. No.: WI/MSK/COKE/01

Standard practice for collection of gross sample of coal

Standard practice for collection and preparation of Coke samples for laboratory analysis

Hard Coal & Coke - Manual Sampling

IS 436 (part 1, Sec-1) Methods of sampling of coal & coke -Manual sampling

Standard practice for preparing coal samples for analysis

Methods of sampling of coke

Quantity Assessment

Doc. No.: WI/MSK/PSA/01


Work Instruction for Physical Stock Assessment

Work Instruction for Volumetric Rake Assessment

Size Analysis

ISO 1953:2015

IS: 437 - 1979, RA 2019

Hard Coal - Size analysis by sieving

Size analysis of Coal & Coke for marketing

The following offices of   MITRA S. K. Pvt. Ltd. are included under accreditation




Key activities performed


Main office

Shrachi Centre (5th Floor),74B, Acharya Jagadish Chandra Bose Road, Kolkata - 700016, West Bengal

Top management functions, quality management system functions, administration & accounts, other key activities as applicable to main office.


Branch office

Bhubaneswar- N-5/100, IRC Village, Nayapalli, Bhubaneswar - 751015

Inspection contract review, Inspection planning & execution, Inspection personnel authorization & assignment, Issue of inspection reports / certificates.


Branch office

Paradip- HB-44, Madhuban, Paradip Port, Pin-754 142

Inspection planning & execution, Inspection personnel authorization & assignment.

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