Decree No. 2 / 1994 Coll.
Decree of the Czech Mining Office laying down the conditions for the construction and operation of the mine fire water pipeline
Valid
Effective from 18.01.1994
2
DECLARATION
Czech Mining Office
of 29 November 1993
laying down the conditions for the construction and operation of the mine fire pipeline
The Czech Mining Office provides pursuant to § 6 paragraph 6 (a) of the Act of the Czech National Council No. 61 / 1988 Coll., on Mining Activities, Explosives and State Mining Administration, as amended by the Act of the Czech National Council No. 425 / 1990 Coll., Act of the Czech National Council No. 542 / 1991 Coll. and Act No. 169 / 1993 Coll.:
INTRODUCTORY PROVISIONS
Scope
This decree applies to the construction and operation of the mine fire ducts in deep mines.
Interpretation of terms
For the purposes of this decree, it shall be considered as:
(a) fire water which, in the event of a mine fire, is intended to be extinguished;
(b) mine fire main supply and distribution of fire water,
(c) the vertical mining work of the pit, the arrow and also the tilting mining work of the surface.
Basic provisions
(1) The mine fire pipeline must be distributed and dimensioned in such a way that it can be removed from the amount of fire water pursuant to Section 4.
(2) The mine fire main may also be used for the supply of technological water and for the purpose of protecting the mine against the explosion of coal dust.
(3) The mine fire main must be protected against freezing.
(4) Fire water shall not contain particles of more than 1,2 mm size.
TECHNICAL REQUIREMENTS
Parameters of mine fire water supply
The mine fire main must be designed to allow
(a) on coal mines in all used and accessible mining works, on other mines in the places referred to in § 13 (2) (a), the supply of fire water at a quantity of at least 400 l.min-1 at a hydraulic pressure at a flow rate of 0,25 MPa, the hydrostatic pressure at the end of the pipe being not less than 0,4 MPa;
(b) in the fluent mines of Class II of the accident hazard, bring to the fire site in the manner specified in the emergency plan the amount of water specified by that plan, but not less than 900 l.min-1, while complying with the pressure specified in (a).
Calculation of the water supply network in the mine
The dimension of individual piping branches for the required flow and pressure parameters may be determined according to the nomogram for determination of resistance in the steel pipe used in Annex 1. This nomogram is compiled according to the Lummert formula at the current coefficient of friction λ = 0,047. For multi-year pipelines, an increase in friction coefficient shall be taken into account.
Connecting the mine fire main and the discharge pipe
(1) Exhaust series of main service stations must be able to connect quickly to the mine fire main. The possible interconnections are set out in Annex 1, Figure 1.
(2) The case of failure to supply fire water from the surface to the mine must be addressed in the emergency plan.
Material
(1) Steel pipes are used for mining fire pipes.
(2) Shavings must be made of materials of the same or better properties as the material of the pipe.
(3) The connection is made by flange connections or welding.
(4) The sealing of flange joints shall be determined taking into account the hydrostatic pressure in the pipe and resistance to the effects of liquids, corrosion and heat.
(5) Fire fittings shall be of non-sparkling material which resists corrosion and the effects of the mine environment.
(6) Fire fittings and hoses must withstand limit pressure (Section 10).
_
Pipe in pit
The water supply line in the pit shall be dimensioned to a pressure equal to the sum of the pressure on the gangway pit or the overflow sink and the hydrostatic pressure at the site. Pipe fixation shall be carried out in accordance with the special Regulation .1)
Fire protection of vertical mining works
(1) All draw-in pits and all arches with rear wind guidance must be equipped with fire damping wreaths.
(2) The fire damping wreaths are not equipped with those airholes and airheads that determine the racing mines with the approval of the district mining office.
(3) Fire dampening wreaths are built in two degrees. The first stage is intended for immediate action against the fire after detection and must be designed only for such volume flow, so that the aeromotor pressure caused by falling water does not cause undesirable changes in wind flow, pumping or overload of main or auxiliary fans, etc. The second stage shall be dimensioned to the highest available flow rate.
(4) If the calculation and evaluation of the effects of falling water proves that the use of a second degree fire damping wreath does not cause undesirable changes in wind flow and does not endanger the ventilation equipment, only one stage, designed as a second degree, may be installed in pits and arches.
(5) The size of the aeromotor pressure induced by falling water is calculated according to the formulae:
Δp = 16,4.q8,9 + in Pa,
ΔpL = Δp.L.10-2 Pa,
where
Δp is the pressure induced by falling water at 100 m depth in Pa,
ΔpL is the pressure at any depth of the pit or arrow in Pa,
L is the depth of the pit or the chipper in m,
q is the flow rate of falling water in l.min-1 per 1m2 of pit or arrow cross section;
v is the wind current rate in the pit or the arrow in m.s.1
(6) The number of degrees of fire damping wreaths shall be determined on the basis of the calculation of the size of the aeromotor pressure induced by falling water and the assessment of the effects of falling water on the wind net and on the ventilation equipment. The accuracy of the calculations shall be verified by practical testing or modelling.
(7) For the fire-extinguishing wreath of the first degree, the water supply of the volume flow determined by calculation shall be provided, to the fire-extinguishing wreath of the second degree with a volume flow of not less than 50 l.min-1 per 1 m2 of pit or chib cross-section.
(8) Fire damping wreaths (both degrees) are placed
(a) in the towing pits under the fire hatches as close as possible to the deafening pit;
(b) in a chipper with a wind-current conductivity as close as possible to the top floor of the chipper;
(c) in windy pits and in bends with wind current at the highest wind speed of 10 m.s-1 as in draw pits.
(9) The water supply to fire damping wreaths shall be operated manually by means of shutoff closures. For the first stage of the fire damping wreaths and for the fire damping wreaths referred to in paragraph 4, automatic control may also be used in addition to the manual control with the distribution of sensors in such locations and distances as to safely indicate the occurrence of the fire and to activate the device. Slippers shall be placed so that they are easily accessible in the event of a fire. To check the water flow, a pressure gauge is placed behind the slide in the direction of the current. If two levels of fire damping wreaths are used, the maximum permissible pressure corresponding to the volume flow of water for the first stage shall be indicated on the fire damper of the fire damping wreath. This pressure when using first-degree fire-fighting wreaths shall not be exceeded.
(10) The stoppers shall be marked with information labels and shall be adequately secured against misuse.
(11) The working capacity of the abatement device shall be checked regularly, no later than 6 months. The volume flow rate shall be checked by means of a measuring device located behind the slide in the direction of the current. The check shall be carried out by the designated staff member. The check shall be recorded indicating the outcome of the check and the measures taken to remedy the deficiencies identified.
Limit pressure
Technical measures shall be taken to avoid increasing the pressure of water in the pipe above the limit pressure. The value of the limit pressure is given by the lowest value of the nominal pressure of used fire hoses and fittings, which is 1,2 MPa for hemp hoses, 1,37 MPa for insulated hoses and 1,6 MPa for wall hydrants.
Reducing stations and sinks
(1) The pressure in the mine fire duct may be reduced if necessary by a reduction station or pit.
(2) The reduction station must be located in an accessible location. Handling of a reduction station shall be prevented from unauthorised persons.
(3) If a pit is used to reduce the pressure, it must be adjusted to ensure that the water supply is continuous in accordance with § 4. The recommended content of one pit is 5 m3. The line may also have several parts interconnected.
Safety valves
After the bypass of the reduction station, the safety valves with the pressurised set pressure shall be fitted less than the limit pressure value.
Location of turnovers for connecting fire hoses
(1) In order to ensure the collection of fire water, the pipeline of the mine fire water duct must be equipped with taps with wall hydrants for connection of fire hoses. Wall hydrant 52 or 75 is connected watertight to the threaded neck of the respective water supply line. The throat slope shall be adjusted according to local conditions so that when used there is no refraction of the attached fire hose.
(2) The sides with wall hydrants must be:
(a) at all mines
1. in the case of estuary of the diaphragm or of the receptacle, if it is the main mine,
2. on the deafening pits,
3. in each crash site of the pit and the shilib,
4. in warehouses and in explosives warehouses,
5. in the case of stores of flammable substances,
6. in places designated by the race mine after discussion with the Regional Mining Rescue Station,
(b) on coal mines also
1. for all underground facilities (chambers), about 5 to 10 m in front of the entrance on the towing side,
2. in corridors with belt transport at distances of not more than 50 m,
3. on all other operated corridors and other used long mining works at distances of no more than 200 m,
4. in the case of wall breakdowns and the families of embossed long mining works, not more than 50 m from the break (face) on both the draught and the airway side,
5. in corridors with belt transport with a bow of more than 5 ° at a distance of not more than 40 m,
6. in the case of open works passing through the compositions liable to self-ignition 20 m prior to fouling, another after 50 m and the last at a distance of 20 m after crossing the mine full profile into the rock,
7.5 m from the last belt beam in the direction against the flow of mine winds,
8. at the end of each branch of the mine fire main,
9. on the preparatory and breach corridors for chambers not more than 50 m from the front or chamber;
10th at the beginning and end of a separate wind department.
Wall hydrants 75 are connected to the valve turnovers at the beginning and end of the separate wind department and at ramifications in the 2nd class of danger.
(3) The emergency plan will identify high fire risk sites. In these areas, the possibility of collecting fire water and the distribution of hose cabinets must also be ensured.
Armatures and hose cabinets
(1) The closing fittings are placed behind each turn of the branch of the pipeline network in all directions. In addition, they are located for greater operationality of the closing slide at distances of about 500 to 800 m from the turnovers of individual branches.
(2) The discharge throat of the wall hydrant must be easily accessible.
(3) The hose portable housing shall be made of non-combustible material and shall contain at least the following equipment:
(a) fire hose with fixed halves 52 x 20 3 pcs,
b) hook wrench for couplings and bolts 1 pcs,
(c) hose hugs 5 pcs,
(d) a screen or fog current of 1 pcs.
In the continuous mines of Class II danger class, the hose portable housing located in the positions referred to in the last sentence of Paragraph 13 (2) shall also contain a reduction half-coupling for the transition from screw C 52 to B 75.
CONTROL, MEASUREMENT AND MARKING
Control of mine fire ducts
Control 2) the condition of pipes and all water distribution accessories consists mainly of control
(a) whether the mine fire pipeline is under pressure;
(b) all flange and threaded joints for tightness;
(c) all fittings in the net, the correct function of which is maintained by the treatment or replacement of seals, spinning and lubrication of spindles, cleaning of seating surfaces and the like;
(d) the contents of the hose cabinets;
(e) pit and reduction stations including safety valves.
Method of pressure and quantity control
(1) A T-piece equipped with a control gauge of 0 to 1,5 MPa and a screen 21 mm or 32 mm in diameter, as set out in Annex No 2, shall be used to measure the amount and pressure of water in the mine fire water duct. The measuring T-piece fitted with a 52 or 75 fixed coupling shall be connected directly to the wall hydrant.
(2) Hydraulic pressure is measured when the wall hydrant is fully opened. The pressure value shall be subtracted on the pressure gauge after its stabilization after the hydrant has been fully opened. The amount of water which passes through a screen with a diameter of 21 and 32 mm at various pressures shall be evaluated in accordance with the table set out in Annex 3, which is part of this Decree.
(3) A record should be made of the outcome of these checks and of the measures taken to remedy the defects.
(4) The physical measuring sites of the quantity delivered in accordance with Paragraph 4 (1) (b) shall determine the racing mine according to local conditions.
Marking
(1) To denote the pipeline (3), a dark red 20 cm wide stripe at a distance of 30 m is sufficient for the mine fire ducts The marking must also be on every turnoff and fittings.
(2) The hose cabinets must be painted with red paint and marked with a white sign "hose cabinet" of 10 cm or a white "H" of 20 cm.
TRANSITIONAL AND FINAL PROVISIONS
Transitional provisions
The obligations referred to in Articles 9 (2) and 9 (6) in the last sentence shall be fulfilled by 31 December 1994 at the latest.
Exceptions
The Czech Mining Authority may, in exceptional cases, allow exemptions from the provisions of Sections 4, 6 (1), 7 (1) and (5), 9 (1), 13 and 14 (4), at the request submitted together with the proposal for a replacement measure.
Efficacy
This decree shall take effect on the day of its publication.
Chairman:
Ing. Bartoš v. r.
Příloha č. 1
Annex No 1
1 - Mining fire main
2 - Expression manifold service
3 - Pump manifold backup
4 - Pressure gauge
5 - Locking slide
6 - Reduction valve
7 - Insurance valve
8 - Manual regulating valve
Fig. 1. Schematic of connection of the mine fire main and discharge pipe
NOMOGRAM FOR DETERMINATION OF THE RESULTS IN THE USE OF STEEL STRENGTH (BY LAMMERT SAMPLING)
Příloha č. 2
Annex No 2
T-piece for measuring hydraulic pressure
| POŘ. Č. SOUČÁSTI | NÁZEV SOUČÁSTI |
|---|---|
| 1 | T - KUS - OCEL.TRUBKA ZÁVIT. G2 S NÁTRUBKEM M 20 × 1,5 |
| 2 | PLÁŠŤ PEVNÉ SPOJKY |
| 3 | CLONA - OCEL |
| 4 | TĚSNĚNÍ - USEŇ |
| 5 | KONTROLNÍ TLAKOMĚR 100 - 0/1,6 MPa |
Příloha č. 3
Annex No 3
Table for water flow assessment
| Hydraulický přetlak za průtoku (MPa) | Průtok (l.min-1) clonou o průměru | |
|---|---|---|
| 21 mm | 32 mm | |
| 0,10 | 169 | 370 |
| 0,20 | 384 | 750 |
| 0,25 | 454 | 880 |
| 0,30 | 511 | 960 |
| 0,35 | 559 | 1040 |
| 0,40 | 600 | 1100 |
| 0,45 | 637 | 1170 |
| 0,50 | 670 | |
| 0,55 | 700 | |
| 0,60 | 727 | |
| 0,65 | 751 | |
| 0,70 | 775 | |
| 0,75 | 796 | |
| 0,80 | 810 | |
| 0,85 | 835 | |
| 0,90 | 853 | |
| 0,95 | 870 | |
| 1,00 | 886 | |
| 1,05 | 900 | |
1) Decree of the Czech Mining Authority No. 22 / 1989 Coll., on safety and health at work and safety at operation in mining and mining activities in underground as amended.
2) § 173 (2) of Decree No 22 / 1989 Coll.
3) § 222 (3) of Decree No 22 / 1989 Coll.
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Regulation Information
| Citation | Decree of the Czech Mining Office No. 2 / 1994 Coll., laying down the conditions for the construction and operation of the mine fire water pipeline |
|---|---|
| Regulation Type | - |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 18.01.1994 |
|---|---|
| Effective from | 18.01.1994 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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