π DGMS Factory Inspection & Audit Checklist β Appendix XIX
Factory inspection is a mandatory step before DGMS grants approval for:
Flameproof equipment
Intrinsically safe equipment
Gas detectors
Electrical machinery
PPE & safety devices
Importer-based equipment
DGMS verifies whether the manufacturerβs production system matches the approved design, standards & safety requirements. Appendix XIX of the DGMS Approval Policy explains exact factory audit points, which we decode below in simple OME style.
πΉ 1. Purpose of DGMS Factory Inspection DGMS conducts factory audits to ensure:
β Correct manufacturing practices β Consistency with technical drawings β Proper quality & safety checks β Calibration of testing equipment β Good traceability system β No unauthorized modification β Adequate test facilities β Controlled production environment
πΉ 2. When Is DGMS Factory Audit Mandatory?
A factory audit is needed in:
1) New DGMS Approval Before issuing approval for the first time.
2) Renewal (Every 3 Years) To verify consistent quality.
3) Suspension / Complaint Cases On receiving field complaints.
4) Imported Equipment (IAR Audit) DGMS inspects service facilities of the Indian Authorized Representative.
πΉ 3. Components of DGMS Factory Audit (Appendix XIX)
A DGMS audit covers 8 major sections:
β 1) Quality Management System (QMS) DGMS checks:
β 6) Material Traceability & Stores Every part must be traceable to:
Batch number
Supplier certificate
Material grade
Inspection report
Raw material acceptance
DGMS checks whether materials used = material in technical drawings.
β 7) Quality Control Records Factory must maintain:
Incoming inspection reports
In-process inspection
Routine test results
Final inspection checklist
Non-conformance records (NCR)
CAPA reports
DGMS ensures all products are batch-tested before dispatch.
β 8) Compliance with Approved Drawings The most important part:
β ANY deviation from drawing = Rejection Examples:
Flamepath dimensions changed
Material changed
PCB design modified
Thickness variations
Fastener grade change
Only DGMS-approved drawings must be in production.
πΉ 4. DGMS Factory Audit Procedure
DGMS Issues Audit Notice β Manufacturer Prepares Documents β DGMS Inspection Team Visits Factory β Verification of QMS, Testing & Production β Check Against Appendix XIX Checklist β Non-Conformity Report (if any) β Corrective Action by Manufacturer β Audit Clearance Issued If non-conformity is not resolved β DGMS rejects/withdraws approval.
πΉ 5. Documents Required During DGMS Factory Audit
ISO 9001 certificate
QAR/QAN
Calibration certificates
Raw material test certificates
Purchase records
Test equipment list
Batch test reports
TG (Technical File)
Flamepath measurement reports
Employee qualification/skill matrix
πΉ 6. Common Reasons for Audit Failure
β Flamepath machining errors β Lack of calibration β No batch test reports β Unauthorized design changes β Poor traceability system β QMS not updated β Production vs. drawing mismatch β Fabricated test reports β Non-certified raw materials
πΉ 7. How to Prepare for DGMS Factory Audit (Checklist)
β Ensure ALL drawings are DGMS approved
β Maintain proper calibration records
β Keep dedicated gauges for flamepaths
β Maintain raw material certification
β Ensure batch-wise QC records
β Provide traceability of every component
β Train QC inspectors & operators
β Keep production as per QMS manual
π₯ 25 MCQs (DGMS Pattern) with Answers
1) Factory audit requirement comes from β a) Appendix VI b) Appendix XIX c) CMR 2017 d) Indian Standards e) None Ans: b
2) DGMS audit checks β
a) GST b) HR files c) Manufacturing & testing d) Parking area e) None Ans: c
3) Calibration records must be β
a) Optional b) Mandatory c) Rare d) Weekly only e) None Ans: b
4) ISO required for DGMS approval β
a) ISO 22000 b) ISO 27001 c) ISO 9001 d) ISO 45001 e) None Ans: c
5) Ex equipment drawings must be β
a) Verbal b) DGMS approved c) Hand-sketched d) Suggested only e) None Ans: b
6) Flamepath finish should be β
a) Rough b) Painted c) Smooth (Ra β€ 6.3 ΞΌm) d) Cracked e) None Ans: c
7) Unauthorized design change leads to β
a) Discount b) Promotion c) Rejection/withdrawal d) Team party e) None Ans: c
8) Test equipment must be β
a) Random b) Calibrated c) Broken d) Cheap e) None Ans: b
9) QAR stands for β
a) Quality Alteration Reference b) Quality Assurance Report c) Quantity Audit Result d) Quota Adjustment Rule Ans: b
10) Factory audit ensures β
a) Festivals b) Employee leave c) Production matches approved drawings d) Salaries e) None Ans: c
11) PCB changes need β
a) No permission b) Fresh DGMS approval c) Manager approval d) Storekeeper permission e) None Ans: b
12) Flamepath measured using β
a) Tape b) Rope c) Feeler gauges/micrometers d) Colour card e) None Ans: c
13) Raw material certificate ensures β
a) Colour b) Smell c) Weight d) Correct grade used e) None Ans: d
14) Field trial data required for β
a) First approval b) Renewal c) GST audit d) Factory layout e) None Ans: b
15) DGMS checks QMS β
a) Monthly b) Sometimes c) During audit d) Every day Ans: c
16) Batch testing is β
a) Optional b) Mandatory c) Not needed d) Temporary Ans: b
17) Flameproof test facility required for β
a) Footwear b) Ex-d equipment c) Gas cylinders d) Uniforms Ans: b
18) Test reports must be β
a) Editable b) Original & signed c) Only photocopies d) Verbal Ans: b
19) Factory audit fails if β
a) Machines working b) Drawings correct c) Calibration outdated d) QMS updated Ans: c
20) Production deviation from drawing β
a) Allowed b) Forbidden c) Encouraged d) Free Ans: b
21) Material traceability used for β
a) Decoration b) Music c) Fun d) Tracking materials used Ans: d
22) Testing infrastructure includes β
a) Toy tools b) HV tester, gauges, pressure test c) Paint brushes d) Fans Ans: b
23) Factory layout part of β
a) Finance b) QMS documentation c) Housekeeping d) Labour law Ans: b
24) DGMS audit team looks for β
a) Company profit b) Employee holidays c) Compliance & safety d) Office chairs Ans: c
25) Purpose of DGMS factory audit β
a) Increase sales b) Reduce workers c) Ensure safe & compliant manufacturing d) Save electricity Ans: c
π Conclusion
DGMS Factory Inspection (Appendix XIX) ensures that equipment is manufactured with proper quality, safety, calibration & control. A high-quality audit system ensures:
Zero design deviation
Authentic testing
Reliable performance
Safe use in gassy mines
Every manufacturer must follow Appendix XIX to avoid rejection, suspension or withdrawal of DGMS approval.
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