DGMS (Tech.) (S&T) Circular No. of Dhanbad, Dated.2 i 01·. The Owners, Agents and Managers of all mines. Sub Guidelines on Occupational . KB minsafety Apr on (Tech)(Approval) Cir No. Files > DGMS Circulars Name DGMS (Tech) Circular 1 of DGMS CIRCULAR LEGISLATIVE AMENDMENT IN THE MINES RULES, CLICK ME TO DOWNLOAD DGMS CIRCULAR.

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The objective is documentation of the standard procedure to be followed for grant of approval under relevant statute to equipment, appliances, machinery and other materials used in mines. The document is divided in several sections each dealing with a particular area of the approval procedure. It is believed that this document will help in clearing many doubts which may arise in course of the approval process and help all concerned in understanding the system in a more comprehensive manner.


It is universally understood that quality inputs result in quality output. This is true in all sphere of activity and is equally relevant in a hazardous occupation like mining where time and again experience has established the need for competent manpower, constant vigilance, sustained use of safe methods and quality materials and equipment which would go a long way in achieving better safety and health conditions of workers engaged in the mines. Use of faulty machinery, equipment, tools and materials had in the past resulted in accidents, disasters and dangerous situations.

This had led to framing of mine safety legislation requiring approval of certain equipment and material to be used in mines. However, grant of approval has been restricted to cover specific equipment and material only. Mining is a hazardous occupation and therefore the equipment, machinery, tools and materials used in mines need to be safe, robust and reliable capable of working safely under hostile environment. The equipment need dgmd remain safe under prolonged usage maybe even in adverse dgs.

In view of this, within the process of approval the actual performance in mines and pitworthiness of the products are also assessed, in addition to examining conformity to relevant standards. A list of equipment and materials requiring approval under the provisions of various statute, standards followed and BIS licensing requirement is given at Appendix-I.

The list also includes the equipment requiring approval through notification in official gazette issued under enabling provisions by DGMS from time to time. The said notifications are given at Appendix-IA. The general procedure for dealing with cases of approval is given in the following paras, in most of the cases this procedure is followed. However, there may be cases, which may deviate slightly from the laid down procedure under special circumstances or due to unique nature of the equipment or material.

The above documents are scrutinised and if found in order, Field Trial approval is granted with a validity ranging from three months to one year depending on the equipment. In case of explosives field trial approval is granted for a specified number of shots, and in case of Fire Resistant Hydraulic Fluid, field trial is given for specified hours. If the above reports are satisfactory, approval is granted for a specified period which differ for different equipment.

Interested manufacturers are required to submit applications in a prescribed format which is available from DGMS head office at Dhanbad. A sample application format is given at Appendix-II. In case there is any change in respect of the information furnished in the application, the applicant shall forthwith send information in the same format duly revised but in no case later than one month from the date of such change.

Testing is mainly divided into two parts, type tests and routine tests. Type tests carried out on a prototype to ensure its conformity to the relevant standards.

DGMS approval is accorded on the basis of type test, and routine tests are to be carried out by manufacturers at their work-site for quality assurance.

Prototype of any equipment, material or appliance where Indian Standards exist, need to be tested as per the relevant standard in an approved test house in India.

DGMS Circulars | Nova Mining

A copy of the circular mentioned above is given at Appendix-III. In certain cases circilars testing memorandum may have to be formulated in consultation with DGMS. If facilities for all the required tests are not available in one test house the required tests can be conducted at more than one approved test house.


Two copies of test certificates, one original and one certified copy thereof have to be submitted along with the application. In case of imported equipment, they need to be tested firculars accordance to relevant Indian Standards, if available. In such cases test certificates from countries of origin of the equipment may be accepted on merit at the discretion of the approving authority.

In the first stage the examination of a particular case involves dgmd following. The test reports are examined with reference to relevant Indian Standards wherever applicable.

Studies are made in respect of drawings and the test reports and these are analysed to determine whether the equipment, material or appliance has met the criteria mentioned in the prescribed standard and passed the performance and safety tests successfully. In such cases if an application is received without BIS certification, the application may be entertained and field trials fgms.

However, approval is accorded only after submitting valid BIS certification or a condition is incorporated in the approval that BIS license shall be obtained before manufacturing and marketing of the product.

Inspection of the manufacturing facilities of the applicant may be made to assess capability of the manufacturer in respect of quality control, testing and other facilities. A format for reporting such an inspection is given at Appendix-IV. On approval, letters permitting field trial are issued to the manufacturer with copies to the users.


The period of field trials vary between 3 months to one year depending on the type of equipment, material or appliance. The periods for conducting actual field trials for different equipment and materials is given in terms of time and quantity in Appendix-V. It is necessary to ensure that trials are conducted in mines suitable for the purpose and will offer adequate scope for monitoring of the performance by DGMS.

For optimum results it may be necessary to conduct field trial at more than one mine, as may be decided by DGMS.

DGMS Circulars 1935-2017

In case of rescue apparatus, field trial is conducted at one or more of the rescue stations before grant of approval. For an application complete in all respects, the time period between receipt of application in DGMS and grant of field trial approval should not normally exceed ninety 90 days. Copies of the field trial approval letters are endorsed to concerned Dy. The concerned Director of Mines Safety in charge of the regional office under which the mine where field trials are conducted falls and Director of Mines Safety Electricalwhere applicable, circulzrs to be kept informed about the trials by the manufacturers.

During field trials, the performance of the equipment, material, etc. In some cases the trials are witnessed by the officers of DGMS. Field trial reporting formats for different types of equipment, material, appliances, etc. After successful completion of field trial and receipt of satisfactory field trial reports, the case is examined and recommendations made for grant dgmz regular approval.

In case any shortcomings are observed during field trials, the same is communicated both during the trials as well as at the end of the trials to the manufacturer along with a copy to the user. The manufacturer may seek extension of the field trial which may be granted based on the merit of the case.

There are cases when field trial report submitted by the user points out some deficiencies, such reports are forwarded to the manufacturers for comments or for taking corrective measures. The Director General of Mines Safety grants the approval with suitable conditions on receiving recommendations from the dgmms dealing departments.

The manufacturers are required to display the mark prominently on every product. All approvals are valid for 0211 particular period ranging from dtms 1 to five 5 years.

Appendix-V gives periods of validity of approval for different equipment, material and appliances. In the past, approval granted were either renewable type or type with permanent approval status. In some cases approvals were given permanent status after few renewals. However, there could be cases where manufacturing of the particular product had been stopped, the standards have undergone complete change or the conditions of usage have changed.

This could create serious consequences jeopardizing safety. As such this necessitates a review of the approvals at regular intervals. Hence, it is necessary that the approvals have a period of validity and even those products which had received permanent approval in the past need to be converted into approvals on renewable basis.


In some cases initial approval is granted for a period of one year after completion of field trials. Application for renewal of such approvals shall be made by the manufacturer at least sixty days prior to the expiry of the approval. The application must be accompanied by satisfactory performance reports from the users.

In case of other renewals the manufacturer must apply six months before the expiry of the approval, accompanied by sample performance reports from the users and valid BIS license where applicable. The criteria for grant of renewal would be, i satisfactory performance reports from users, ii no complaints about the product from the users or others, iii valid BIS license where applicable. From time to time, Indian and other Standards are subject to revisions incorporating various changes including testing and quality control systems.

An equipment, material or appliance which had been granted approval based on such standards need to be amended incorporating the changes. Manufacturers need to make immediate application for amendment of the approval, failing which the approval shall be treated as revoked.

Item Self-rescuer has been deleted from the list, as specific provision exist under Regulation D of the Coal Mines regulations, Safety belts should conform to IS Such circualrs belts shall be treated at par with the safety belts accorded approval by DGMS in past.

GSR – In exercise of the powers conferred on me under sub-regulation 3 of regulation of the Coal Mine Regulations,I, V Mahajan, Chief Inspector of Mines re-designated as the Director General of Mines Safety declare 1 st July, as the date from which the following items will not be used in underground coal mines unless the same are of such type, standard and make as approved by me by a general or special order in writing: In the said notification: A number of accidents occur every year due to defective couplings between tubs.

Investigation into the causes of such failures of couplings have revealed that the defects were due to one or more of the following factors: Couplings in use in the industry not conforming to the designs shown in the Annexure referred and not specially approved separately shall be withdrawn forthwith from the date of issue of this circular.

Only following material shall be used: To achieve better mechanical properties it should be normalised and tempered. Every coupling after all forging and welding operations shall be normalised in a recognised establishment and certificate for heat-treatment shall be obtained. For steels mentioned at 2. L circuulars which the coupling is designed and shall be tested for cracks etc.

In case any crack is detected either visually or by magnetic particle inspection and any coupling failing in proof load test, another lot of equal number shall be tested and in case any coupling failing in the subsequent test such coupling circukars lot will be tested.

L for which the coupling is designed. A record of coupling in use stating the reference number, date of manufacture and date of use shall be maintained.

If couplings are procured from more than one manufacturer, the name, address and other relevant informations in respect of each shall be recorded in a bound paged book. Fortnightly inspections as prescribed in the regulations shall be conscientiously made and a report of such examination shall be kept.

Any coupling involved in derailment or accident shall be specially inspected at the earliest opportunity and if suspected to have been damaged it shall not be used unless certified by a competent person superior in rank to one taking the inspection and report of such inspection be kept.

You are aware that under Reg. These enquiries have also revealed that some failures of couplings occurred owing to use of material that was not of the required quality, adoption of defective manufacturing process, non-maintenance of designed shape, circklars. As a result of this exercise it has been decided that 5 tonne corculars should be manufactured as per designs Dtms. These may be fully complied with. Forge welding of steel is not desirable. Electrical welding shall be done where necessary and where are welding is done, slag shall be carefully cleaned at each stage.

Holes shall be drilled and not punched.