| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | 30396867_36.pdf <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | 30396867_word doc.pdf <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | 3 Terms and definitions 4 Fire hydrants 4.1 General <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 4.2 Type 1 fire hydrant <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 4.3 Type 2 fire hydrant 4.3.1 Classification <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 4.3.2 Dimensions <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.3.3 Materials 4.3.3.1 All copper alloy materials used in the construction of fire hydrants shall conform to BS EN 1982, BS EN 12163, BS EN 12164, BS EN 12165, BS EN 12167 or BS EN 12168. 4.3.3.2 The threaded part of the valve that engages with the stem shall be copper alloy. 4.3.3.3 All components of the valve operating mechanism shall consist of materials that avoid the risk of corrosion or galling resulting in seizure or mechanical failure. 4.3.3.4 Stems of type 2 fire hydrants shall be manufactured from stainless steel conforming to BS EN 10088-1 with a minimum chromium content of 13%, or copper alloy (see 4.3.3.1). <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.3.3.5 Stainless steel outlets shall be manufactured from grades conforming to BS EN 10088-1 with a minimum chromium content of 13%. 4.3.4 Sealings 4.3.5 Stem seals <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.3.6 Bonnets <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5 Outlets 5.1 The outlets shall be manufactured from copper alloy or stainless steel materials conforming to 4.3.3 and shall conform to 10.3 and 10.4. The outlet shall conform to the dimensions shown in Figure 3. 5.2 Components involved in the attachment or retention of fire hydrant outlets shall not be made from plastics. 5.3 The design of the fire hydrant and the outlet shall allow full engagement onto the outlet of a standpipe conforming to BS 336:1989, Figure 12. 5.4 Outlets connected by means other than that described for type 2b and type 2c shall be secured by two independent and functionally different means. These different means shall each be capable of preventing the outlet becoming unintentionally detach… 5.5 Outlets connected by means other than that described for type 2b and type 2c shall conform to the type requirements in Clause 10 with: 5.6 The screwed outlet shall be provided with a cap to cover the outlet, see Figure 6. It shall be securely attached to the fire hydrant by a chain or other flexible device. <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6 Stem drive 6.1 Dimensional and performance requirements <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 6.2 Closing direction 6.3 Stem termination 7 Draining system 7.1 Each type 2 fire hydrant and each duckfoot bend on a type 1 fire hydrant shall be provided with a drain boss on the outlet side. It shall be located at the lowest practicable point that allows the fitting of a blank plug, drilled drip plug or self… 7.2 Where fitted to the fire hydrant, the draining system shall perform in accordance with BS EN 1074-6:2008, 5.6. In addition, the manufacturer shall specify the volume of retained water and the time for draining. 8 Coating 8.1 All ferrous components liable to corrosion shall be prepared and coated in accordance with WIS 4-52-01 [N2] and WIS 4-52-02 [N3] or specifier\u2019s requirements. 8.2 Fasteners involved in the construction of a fire hydrant shall either be of an appropriate grade of stainless steel having a minimum chromium content of 13%, or be coated in accordance with WIS 4-52-03 [N4] or an equivalent standard for a barrier … 8.3 Details of the coating process or standard used shall be specified in the manufacturer\u2019s literature. 9 Maintenance of water purity (potable water systems only) 10 Type requirements 10.1 General 10.2 Hydraulic characteristics <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 10.3 Load\/deflection requirements of screwed outlets 10.3.1 Ten sample outlets shall be tested in accordance with A.1. 10.3.2 Five of these samples, when tested in accordance with A.1.4.1, shall exhibit a maximum angular deflection of not greater than 7.5 and shall have a residual angle of deflection of not greater than 2 , both measured from the unloaded datum posit… 10.3.3 Additionally, the samples shall exhibit no fractures and shall not have sustained damage that prevents subsequent reconnection of the standpipe. 10.3.4 The remaining five samples, when tested in accordance with A.1.4.2, shall exhibit no leakage during the test. 10.4 Strength and leak tightness requirements of type 2a and type 2d screwed outlets \u2013 resistance of screwed outlets to rotational force 10.5 Resistance of fire hydrants to operating forces 10.5.1 This test shall be carried out before the tests in 10.6 and 10.7. 10.5.2 When subjected to a minimum hydraulic pressure of (PFA + 0.4) MPa (PFA + 4.0 bar), fire hydrants shall withstand, in both fully open and fully closed positions, a torque of (210 \u00b110) Nm applied simultaneously with a lateral force giving a bendi… 10.6 Strength and leak tightness requirements of type 2a and type 2d bonnets \u2013 resistance of bonnets to rotational force <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 10.7 Endurance of the outlet requirement 10.8 Air release 10.9 Obturator impact resistance 11 Fire hydrant assembly \u2013 resistance to internal pressure of the shell and of all pressure containing components and resistance of the obturator to differential pressure 12 Hydrostatic test certificate 13 Marking and additional data 13.1 Each fire hydrant assembly shall be clearly marked in accordance with BS EN 1074-6, BS EN 14339 and the following: 13.2 Additional fire hydrant data shall be provided in accordance with BS EN 14339:2005, 6.2. <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 14 Surface box frames and covers 14.1 General 14.2 Grading 14.3 Materials 14.4 Manufacture, workmanship and coating 14.5 Design features 14.5.1 Clear opening <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 14.6 Frame depth and width 14.7 Surface box cover lifting arrangement 14.7.1 General 14.7.1.1 To ensure that the dynamic effects or momentum do not mask a potential for the fire hydrant cover to fall through the frame, the cover shall be one-piece unless it can be demonstrated that multiple-piece cover components fulfil the requiremen… 14.7.1.2 The design of the cover shall allow its direct removal from the frame by a single user using a prising bar (of the limits of the dimensions in Figure 8) engaged in a prising slot to free, lift and rotate that end of the cover to the point whe… 14.7.1.3 Where the cover has more than one prising slot intended for use in cover removal, the requirement in 14.7.1.2 shall apply to the cover being lifted by each of these prising slots in succession. 14.7.1.4 Opening of the cover using a prising bar shall not preclude an alternative opening method that uses lifting keys inserted into the keyways following cover-loosening by a prising bar (of the limits of the dimensions in Figure 8). <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 14.7.1.5 Frames or covers shall be provided with a minimum of two prising slots, see Figure 9. The dimensions of the prising slots shall be: <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 14.7.1.6 The cover shall indicate the primary prising slot. 14.7.1.7 The thickness of cover and frame material at the prising slot locations shall be appropriate for the expected leverage loads from prising bar usage. Such material thicknesses shall not show cracking or visible plastic deformation during prisi… 14.7.1.8 Two keyholes shall be provided for single-piece covers or one keyhole in each cover component for multiple-piece cover designs. The keyholes shall be located to allow a balanced lift during cover removal unless other deliberate design feature… 14.7.2 Keyholes 14.7.3 Additional requirements <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 15 Fire hydrant chamber alignment 16 Marking 16.1 Surface box covers shall be clearly marked by having the words \u201cFIRE HYDRANT\u201d in letters not less than 30 mm high, or the initials \u201cF.H.\u201d in letters not less than 75 mm high, cast into the cover. 16.2 In accordance with 14.2, the following marking shall clearly be cast into the cover and frame as \u201cBS 5834-2 and BS 750 Grade A\u201d or \u201cBS 5834-2 and BS 750 Grade B\u201d. 17 Type requirements <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 18 Production requirements 19 Test certificate Annex A 20 (normative) Type tests for fire hydrant strength, security and endurance 20.1 Load\/deflection test 20.1.1 Principle 20.1.2 Apparatus 20.1.2.1 Specimen fire hydrant (with outlet) or specimen outlet (in the case of type 2b and type 2c), mounted to a rigid plate capable of enabling an internal water pressure of (PFA + 0.4) MPa (PFA + 4) bar to be applied. 20.1.2.2 A standpipe of sufficient length or a blanking cap (modified to have a suitable loading bar connected to the test outlet). The standpipe or loading bar shall be of sufficient length that the specified bending moment can be generated by a forc… <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | A.0.1 Test specimens A.0.2 Procedure A.0.2.1 Apply a minimum bending moment of 1 500 Nm, as described in A.1.2, for 10 s. Document the angular deflection at this point. Remove the applied force and, after 2 min, measure the residual angular deflection. <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | A.0.2.2 With a hydrostatic pressure of (PFA + 0.4) MPa (PFA + 4.0) bar applied within the outlet, apply a minimum bending moment of 750 Nm, as described in A.1.2, for a period of 1 min checking for leaks. At the end of this period remove the applied… A.0.2.3 Repeat the test procedure in A.1.4.1 and A.1.4.2 on the same sample three times with the force applied at approximately 45 , 90 and 180 from the position of the first test. A.0.2.4 Repeat the test procedure in A.1.4.3 on the same sample in, potentially, the most vulnerable orientation of the outlet to the force, unless this position has already been covered by the test procedure in A.1.4.2 and A.1.4.3. A.1 Test for rotational resistance of outlet A.1.1 Principle A.1.2 Apparatus A.1.2.1 Test rig, capable of withstanding test forces provided to mount the fire hydrant. A.1.3 Test specimens A.1.4 Procedure A.1.4.1 Mount and secure the fire hydrant by its inlet connection to the test rig. Fit a blanking cap to the outlet and, if necessary, provide a means of rigidly securing it to the threaded portion of the outlet to prevent the cap being removed during… A.1.4.2 Apply a torque of (50 \u00b12.5) Nm directly to the outlet in a clockwise direction, hold for a minimum of 30 s and observe for any visual movement. Repeat the test in an anticlockwise direction and observe for any visual movement. A.1.4.3 Repeat A.2.4.2 with a torque of (300 \u00b115) Nm and measure the total rotational movement (from fully clockwise to fully anticlockwise) of the outlet. A.1.4.4 Repeat A.2.4.3 with an internal hydrostatic pressure of (PFA + 0.4 MPa (PFA + 4.0) bar. Examine the outlet\/body joint during the test for visible signs of leakage. A.2 Test for rotational resistance of bonnets A.2.1 Principle A.2.2 Apparatus A.2.2.1 Test rig, capable of withstanding test forces provided to mount the fire hydrant. A.2.3 Test specimens <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | A.2.4 Procedure A.2.4.1 Mount the fire hydrant on the test rig and fit a blanking cap to the outlet. Provide a means of applying a torque either directly to the bonnet or by any suitable device that does not add to the strength of the body\/bonnet connecting system. A.2.4.2 Apply a torque of (50 \u00b12.5) Nm directly to the bonnet in a clockwise direction, hold for a minimum of 30 s and observe for any visual movement. Repeat the test in an anticlockwise direction and observe for any visual movement. A.2.4.3 Repeat A.3.4.2 with a torque of (300 \u00b115) Nm and measure the total rotational movement (from fully clockwise to fully anticlockwise) of the bonnet. A.2.4.4 Repeat A.3.4.3 with an internal hydrostatic pressure of (PFA + 0.4) MPa (PFA + 4.0)bar. Examine the bonnet\/body joint during the test for visible signs of leakage. A.3 Flow rate testing Annex B (normative) Type hydrostatic tests for screwed outlets B.1 Principle B.2 Apparatus B.2.1 Test rig, capable of withstanding test forces shall be provided to mount the fire hydrant. B.3 Test specimens B.4 Procedure B.4.1 Mount the outlet to a fire hydrant. Fit a standpipe or blanking cap in accordance with BS 336 to the outlet with a torque of (150 \u00b17.5) Nm and then remove it. Repeat this procedure 200 times. B.4.2 Blank off the screwed outlet using a blanking cap and connect the other end to a pressurized water supply. B.4.3 Subject the screwed outlet to a hydraulic pressure of not less than 1.5 \u00d7 PFA for a period of not less than 1 min. <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Annex C (normative) Air release test C.1 Principle C.2 Apparatus C.3 Procedure C.3.1 Ensure the hydrant is conditioned at 20 C (\u00b12 C) for a period of 6 h. Mount the hydrant to a container of at least 2500 cc internal volume. Close the hydrant valve to the maximum operating torque (MOT). C.3.2 Charge the container with water at a pressure of 0.1 bar maximum for a period of 5 mins, such that the level of water traps not less than 2500 cc of air plus the volume of the closed hydrant valve at the inlet side of the obturator. <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | C.3.3 Open the hydrant until the air audibly commences to vent to atmosphere then apply a further 60 in the opening direction to the stem. Complete opening the further 60 in less than 1 s of the initial air vent. C.3.4 Maintain this position at 16 bar until all air is evacuated and fluid is released from the outlet. C.3.5 Close the hydrant to MOT. C.3.6 Repeat this cycle 50 times. C.3.7 After completion of C.3.6, complete tests in accordance with BS EN 1074-6:2008, 5.1.2, 5.2.2 and 5.2.3. C.4 Test report Annex D (normative) Obturator impact resistance test D.1 Principle D.2 Procedure D.2.1 Condition the hydrant at \u221210 C for 2 h. D.2.2 Within 30 seconds of removal from the environment, allow a 3 kg, 25 mm diameter spherical tip to fall freely from a height of 1 m through the centre of the outlet onto the hydrant obturator with the hydrant secured in the normal operating position. D.2.3 Following the impact test, test the hydrant in accordance with BS EN 1074-6:2008, 5.1.2, 5.2.2 and 5.2.3. D.3 Test report Annex E (normative) Hydrant box cover opening procedure Annex F (normative) Information to be supplied by the purchaser <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Annex G (normative) Type and production loading tests for surface box frames and covers G.1 Principle G.2 Apparatus G.2.1 Standard frame, to be used as a supporting frame. G.2.2 Bearing block, of 300 mm ( 200 mm, of hardwood faced with hard rubber or other resilient material. Ensure that it is sufficiently rigid so that the load on the cover is evenly distributed over the full area of the block. For the tilt test, the b… G.2.3 Device, preferably a hydraulic testing machine, for applying the load, capable of applying a load at least 25% greater than 300 kN for grade A and 125 kN for grade B. Where used, a testing machine shall be in accordance with the accuracy requir… G.2.4 Measuring device, accurate to 0.1 mm, suitable for indicating deflection measurements on spheroidal graphite cast iron units. G.3 Surface box frame and cover type tests (all material types) G.3.1 Tilt test procedure G.3.1.1 Following the application of a bedding-in load in accordance with BS 5834-2:2011, Annex A, test the cover and frame in accordance with Clause 16 using the apparatus described in G.2. G.3.1.2 Apply the test load to a new cover and frame in accordance with Clause 16. Apply the load through the bearing block placed on the cover so that nominally 75% of the bearing block is located outside of the perimeter of the upper frame edge. Rep… G.3.1.3 Cover removal test G.3.1.4 Design load test G.3.1.5 Apply a test load of 300 kN for grade A and 125 kN for grade B without shock, and sustain it for a minimum of 30 s. <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | G.4 Surface box frame and cover type tests (additional tests for non-metallic products) G.5 Production batch load and permanent set tests G.5.1 Grey cast iron frames and covers G.5.1.1 Procedure G.5.1.1.1 Support the cover in the frame (G.2.1) and position the bearing block (G.2.2) centrally on and wholly within the perimeter of the unit being tested. G.5.1.1.2 Apply the appropriate test load from Table 1 without shock and sustain it for a minimum of 30 s. G.5.2 Frames and covers in all other materials G.5.2.1 Procedure G.5.2.1.1 Support the cover in the frame (G.2.1) and position the bearing block (G.2.2) centrally on and wholly within the perimeter of the unit being tested. G.5.2.1.2 Before the load is applied take an initial reading with the measuring device (G.2.4) at a point midway between two selected supporting seatings to establish a datum point. G.5.2.1.3 Where it is not practicable to make this measurement exactly on the line drawn between the two supporting seatings, take it on a line parallel to, and as near as possible to, this line. G.5.2.1.4 Apply the appropriate test load from Table 1 without shock five times and sustain alternating maximum and zero loads for minimum periods of 20 s; take a second reading at the datum point. G.5.2.2 Expression of results Annex H (normative) Alignment and depth of the hydrant in the chamber <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" BS 750. Underground fire hydrants. Surface box frames and covers. Specification<\/b><\/p>\n |