Standard performance parameters for fire hydrants

The mechanical properties of the valve stem are as follows:6.2According to the prescribed method of testing, its tensile strength should be greater than420N/mm2.

5.2.4 SNJTypeSNZJTypeSNWTypeSNZWThe application of throttling devices for indoor fire hydrants complies withGB/T 1176The prescribed cast copper alloy or other metal materials with properties not inferior to cast copper alloy.

5.2.5 SNJTypeSNZJTypeSNWTypeSNZWThe spring of the indoor fire hydrant should be made of corrosion-resistant or anti-corrosion treated materials.

5.3 Basic dimensions and tolerances

The basic dimensions of indoor fire hydrants should comply with the table3the provisions Its tolerance should comply withGB/T 1804 vLevel regulations.

watch3 basic size

Nominal Diameter DN/mm	model	water inlet		basic size/mm
		pipe thread	thread depth	Height after closing ≤	Center height of water outlet	The distance between the center of the valve stem and the outer edge of the interface is ≤
25	SN25	Rp 1	18	135	48	82
50	SN50	Rp 2	22	185	65	110
	SNZ50			205	65～71
	SNS50	Rp 2½	25	205	71	120
	SNSS50			230	100	112
60	SN65	Rp 2½	25	205	71	120
	SNZ65			225	71～100
	SNZJ65 SNZW65					126
	SNJ65 SNW65
	SNS65	Rp 3			75
	SNSS65			270	110
80	SN80	Rp 3	25	225	80	126

5.4 sealing element

All sealing parts of indoor fire hydrants should be equipped with sealing components.

5.5 Fixed interface

The fixed interface should comply withGB 3265Qualified products as specified. Its type should beKNType. The nominal diameter of the fixed interface should be consistent with the nominal diameter of the indoor fire hydrant.

5.5.1sealing performance

press6.4.1When conducting sealing performance tests on fixed interfaces using the prescribed method, there should be no leakage.

5.5.2Water pressure intensity

press6.4.2When conducting sealing performance tests on fixed interfaces using the prescribed methods, no cracks or fractures should occur. After the experiment, it should be able to operate normally.

5.6 handwheel

The type and size of the handwheel should comply withJB/T 1692the provisions The diameter of the handwheel should comply with the table4the provisions The tolerance of its dimensions should comply withGB/T 1804 vLevel regulations. Arrows and letters indicating the direction of the switch should be clearly cast on the rim of the handwheel.

watch4 handwheel diameter

Nominal DiameterDN/mm	Model	handwheel diameter/mm
25	SN25	80
50	SN50TheSNZ50TheSNS50TheSNSS50	120
65	SN65TheSNZ65TheSNJ65TheSNZJ65TheSNW65TheSNZW65TheSNSS65	120
	SNS65	140
80	SN80	140

5.7 thread

The inlet, outlet, and fixed interface connection of indoor fire hydrants should be cylindrical pipe threads, and the thread size of the inlet should comply with the table3The regulations; The valve stem and valve stem nut should have trapezoidal threads.

5.8 Valve stem lifting performance

The assembled indoor fire hydrant valve stem should rise and fall smoothly and flexibly, without any jamming or loosening. press6.7According to the prescribed method of testing, the maximum torque of the rotating valve stem must not exceed8.0N?m.

5.9 Rotation performance

press6.8The prescribed method for transferring wellSNZTypeSNZJType andSNZWWhen conducting a rotational performance test on indoor fire hydrants, the valve body should be able to360Rotate in degrees, and the rotation should be flexible. The maximum torque required to rotate the valve body should not exceed10.0 N?m.

5.10 Open height

SNTypeSNZTypeSNSTypeSNZSSThe opening height of indoor fire hydrants should not be less than1/3D（DThe nominal diameter.

5.11 intensity

press6.10When conducting hydraulic strength tests on the strength and material tightness of the valve body and valve cover, the valve body and valve cover should be able to withstand2.4MPaPressure, continuous2minThere shall be no rupture or leakage.

5.12 sealing performance

press6.11When conducting water pressure sealing tests on assembled indoor fire hydrants, each sealing part should be able to withstand1.6MPaPressure, continuous2minThere shall be no leakage phenomenon.

5.13 pressure loss

SNTypeSNZTypeSNSTypeSNZSSThe inlet flow rate of the indoor fire hydrant is2.5m/sUnder certain conditions, the pressure loss caused by hydraulic friction shall not exceed0.02MPa.

5.14 Pressure reduction, pressure stabilization performance, and flow rate

5.14.1Pressure reducing performance and flow rate

SNJTypeSNZJIndoor fire hydrant type6.13.1According to the prescribed method for testing, the pressure values at the inlet and outlet should be provided by the production unit, and the allowable deviation of the outlet pressure should be ±0.02MPa, and the traffic is greater than5.0L/s.

5.14.2Pressure reducing and stabilizing performance and flow rate

SNWTypeSNZWIndoor fire hydrant type6.13.2The prescribed method shall be used for testing, and its voltage stabilization performance and flow rate shall comply with the table5According to regulations, pressure oscillations must not occur during the process of increasing and decreasing pressure in the experiment.

watch5 Pressure reducing and stabilizing performance and flow rate

Pressure reduction and stabilization category	Inlet pressureP1/MPa	Inlet pressureP2/MPa	trafficQ/（L/s）
Ⅰ	0.4～0.8	0.25～0.35	Q≥5.0
Ⅱ	0.4～1.2
Ⅲ	0.4～1.6

5.15 corrosion resistance

press6.14The corrosion resistance test should be conducted using the prescribed method, and the sample should not suffer from corrosion damage. After the experiment, the lifting performance, rotation performance, and sealing performance of the valve stem should be inspected and respectively meet the requirements5.8、5.9、5.12the provisions

6 Test Method

6.1 appearance

Visually inspect the appearance quality of indoor fire hydrants, which should comply with5.1requirement.

6.2 Valve stem material

6.2.1After removing the valve stem of the indoor fire hydrant, pressGB/T 228Processing into test bars according to regulations.

6.2.2Experimental steps are as followsGB/T 228According to the regulations, the results should comply with5.2.3the provisions

6.3 Basic dimension inspection

Place the indoor fire hydrant vertically on a flat surface and measure the dimensions of each part of the hydrant using a universal measuring tool. The results should comply with the requirements5.3requirement.

6.4 Fixed interface

6.4.1sealing performance

6.4.1.1experimental setup

Test the pressure pump and equip it with a stabilizing device;

Pressure gauge: accuracy not less than1.5Grade, range not exceeding6MPa；

Stopwatch.

6.4.1.2Experimental Procedure

After connecting the fixed interface sample to the corresponding specification interface cover, install it on the testing device, fill the sample with water and eliminate the air in the sample, and slowly and evenly increase the pressure1.6MPaMaintain pressure2minObserve the condition of the pattern during the pressure holding process, and the test results should comply with5.5.1regulations.

6.4.2Water pressure intensity

6.4.2.1The experimental apparatus is the same6.4.1.1the provisions

6.4.2.2use6.4.1.2Test method: Increase the water pressure to2.4MPaMaintain pressure2minThe test results should comply with5.5.2regulations.

6.5 handwheel

Measure the dimensions of each part of the handwheel with a universal measuring tool, visually inspect the appearance of the handwheel, and the results should comply with5.7the provisions

6.6 thread

Measure the thread with a thread gauge or other thread measuring tool, and the result should comply with5.7the provisions

6.7 Valve stem lifting performance

6.7.1experimental setup

The sample device is the same6.4.1.1regulations.

6.7.2Test preparation

Clear the oil and dirt inside the valve body, install the indoor fire hydrant on the experimental device with the valve stem in a horizontal position and the water outlet facing upwards, and fill the chamber with water to remove air.

6.7.3Experimental Procedure

Rotate the handwheel by hand to visually and tactfully check the flexibility of the valve stem during the full opening process of the valve disc. Rotate the handwheel by hand to close the valve disc, apply pressure from the inlet end, and gradually increase the pressure to1.6MPaAfterwards, use a measuring tool to measure the maximum torque required for the valve stem to rotate during the full opening process of the valve disc, which should comply with5.8the provisions

6.8 Rotation performance

6.8.1The experimental setup is the same as6.4.1.1regulations.

6.8.2Preparation for the experiment6.7.2regulations.

6.8.3Rotate the handwheel by hand to close the valve disc, apply pressure from the inlet end, and gradually increase the pressure to1.6MPaAfterwards, rotate the valve body to visually and tactfully check the rotation angle and flexibility of the valve body. The maximum torque required to measure the rotation of the valve body using measuring tools should comply with5.9the provisions

6.9 Open height

Place the indoor fire hydrant vertically on a flat surface, and use a height gauge to measure the upward distance of the valve stem when the valve disc is in the closed position to the maximum open state. The measurement results should be consistent with each other5.10the provisions

6.10 intensity

6.10.1The experimental apparatus is the same6.4.1.1regulations.

6.10.2Preparation for the experiment6.7.2regulations.

6.10.3Rotate the handwheel by hand to place the valve disc in the maximum open position, seal the outlet, and add water and pressure from the inlet end, gradually increasing the pressure to2.4MPaAfterwards, maintain pressure2minAnd with a handle length not exceeding200mmThe quality is0.5kgThe result of lightly tapping the valve body and cover with a copper hammer should comply with5.11the provisions

6.11 sealing performance

6.11.1test device

The experimental apparatus is the same6.4.1.1regulations.

6.11.2Experimental preparation

Preparation for the experiment6.7.2regulations.

6.11.3Test steps for sealing performance between valve disc and valve seat

Rotate the handwheel by hand to close the valve disc, apply pressure from the inlet end, and gradually increase the pressure to1.6MPaAfterwards, maintain pressure2minThe result should comply with5.12the provisions

Note: The sealing between the valve disc and the valve seat should be achieved by manually turning the handwheel to close it, and tools should not be used for assistance.

6.11.4Experimental steps for sealing performance of other connection parts

Seal the outlet end, lift the valve disc to the maximum open position, and add water and pressure from the inlet end, gradually increasing the pressure to1.6MPaAfterwards, maintain pressure2minThe result should comply with5.12the provisions

6.11.5Experimental steps for sealing performance of rotary indoor fire hydrants

Install the rotating indoor fire hydrant100time0°～360After the ° rotation test, turn the handwheel by hand to close the valve disc, apply pressure from the inlet end, and gradually increase the pressure to1.6MPaAfterwards, maintain pressure2minThe space between the valve disc and the valve seat, as well as between the valve base and the plug body, should comply with5.12the provisions Then seal the outlet end, lift the valve disc to the maximum open position, and add water and pressure from the inlet end, gradually increasing the pressure to1.6MPaAfterwards, maintain pressure2minThe result should comply with5.12the provisions

6.12 pressure loss

6.12.1Test preparation

Clean the oil and dirt inside the chamber of the indoor fire hydrant according to the diagram1Install the piping as shown.

6.12.2Experimental steps

Open the valve disc to the maximum position, seal one outlet of the single valve dual outlet indoor fire hydrant, and close one valve disc of the dual valve dual outlet indoor fire hydrant. Adjust the opening height of the shut-off valve and throttle valve to maintain the inlet flow rate2.5m/sUsing a differential pressure transmitter to measure the pressure difference between the inlet and outlet should comply with5.13the provisions

6.13 Pressure reduction, pressure stabilization performance, and flow rate

6.13.1Pressure reducing performance and flow rate

6.13.1.1Preparation for the experiment6.12.1regulations.

6.13.1.2Open the valve disc to the maximum position and manually adjust itSNJType andSNZJThe throttling device of the indoor fire hydrant should be adjusted to the position of the pressure value after the hydrant provided by the production unit. The opening height of the shut-off valve and throttling valve should be adjusted to raise the inlet water pressure to a certain value provided by the production unit. The pressure value and flow rate after the hydrant should comply with the requirements5.14.1the provisions

6.13.2Pressure reducing and stabilizing performance and flow rate

6.13.2.1Preparation for the experiment6.12.1regulations.

6.13.2.2Open the valve disc to the maximum position, adjust the opening height of the shut-off valve and throttle valve, and slowly raise the inlet water pressure to the gauge5The specified pressure, post plug pressure value, and flow rate should comply with5.14.2the provisions

6.14 corrosion resistance

6.14.1Before the experiment, soak and clean the surface of the specimen in neutral cleaning solution, rinse it with clean water, dry it, and place it in a salt spray box in its normal installation state.

6.14.2The test conditions for salt spray corrosion test are as follows:

Salt solution concentration:50g/L±1g/L;

Salt spray settling rate:1.0mL/h～2.0mL/h(In)80cm2Within the horizontal collection area;

Salt solution in35At ℃pHThe value should be maintained at6.5～7.2Within the scope;

The temperature of the space for storing test specimens in the salt spray box is35℃±2℃。

Spray method: continuous spray8hThen stop spraying16h，24hFor one cycle, a total of5One cycle. When stopping spray, do not heat it, close the salt spray box and let it cool naturally.

6.14.3After the experiment is completed, remove the specimen, rinse the surface of the specimen with flowing cold water, and dry it at room temperature24hThe above. dry

After drying, the samples are separately processed according to6.7、6.8、6.11The test method is used to inspect the lifting performance, rotation performance, and sealing performance of the valve stem,

The results should be consistent with each other5.8、5.9、5.12the provisions

7 Inspection Rules

7.1 Inspection classification and items

7.1.1type test

7.1.1.1When one of the following situations occurs, a type inspection should be conducted.

a)During the trial production and finalization evaluation of new products;

b)After formal production, if there are significant changes in the product structure, materials, processes, or processing methods of key processes;

c)When a major quality accident occurs;

d)Product discontinuation1Over years old, when production resumes;

e)When quality supervision agencies make requirements;

f)Normal production is full3During the year.

7.1.1.2The product type inspection items should be in accordance with the table6The regulations are in place.

7.1.2Factory Inspection

The factory inspection items of the product should be in accordance with the table6The regulations are in place.

watch6 Type inspection items, factory inspection items, and non-conforming categories

Inspection items and content		type Inspection Item	Factory inspection items		Unqualified category
			full inspection	random inspection	Aclass	Bclass	Cclass
Appearance quality	Casting quality	★	★				★
	Coating color	★	★				★
	coating quality	★	★				★
material	Valve stem, valve seat, and valve stem nut	★		★	★
	Valve body, valve cover, and valve disc	★		★		★
	Tensile strength of valve stem	★		★		★
Basic dimensions and tolerances	Basic Parameters	★		★	★
	Inlet thread	★		★		★
	basic size	★		★			★
sealing element		★	★				★
Fixed interface	Specification and type	★	★				★
	sealing performance	★		★			★
	Water pressure intensity	★		★	★
handwheel	Type and size	★		★			★
	Switch direction	★		★	★
Valve stem lifting performance		★		★		★
Rotation performance		★		★		★
Open height		★	★	★			★
intensity		★	★		★
sealing performance	Between valve disc and valve seat	★	★		★
	Between the rotating base and the bolt body	★	★		★
	Between other sealed parts	★	★			★
pressure loss		★		★	★
Pressure reduction, pressure stabilization performance, and flow rate	Pressure reducing performance	★		★	★
	Pressure reducing and stabilizing performance	★		★	★
	traffic	★		★	★
corrosion resistance		★		★	★
logo	no sign	★		★	★
	other	★		★		★

7.2 sampling method

7.2.1The type inspection adopts random sampling, with a sample size of each model3The platform.

7.2.2Factory inspection is conducted for each50The table is in one batch, and each batch randomly selects samples of each model3The platform.

7.3 Judgment of inspection results

7.3.1type test

If any of the following situations occur during the type inspection of indoor fire hydrant products, the product shall be judged as unqualified.

appearAClass projects are not qualified;

appearBThe number of unqualified projects in the class is greater than or equal to2；

appearCThe number of unqualified projects in the class is greater than or equal to4；

If there is already one itemBWhen the class project is unqualified,CThe number of unqualified projects in the class is greater than or equal to2.

7.3.2Factory Inspection

All the factory inspection items of indoor fire hydrants are qualified, and this batch of indoor fire hydrants is qualified.

There is oneAIf the class project is unqualified, then the batch of indoor fire hydrants is unqualified. if there isBClass project orCIf the class project is unqualified, double sampling inspection is allowed. If there are any unqualified items, the batch of indoor fire hydrants will be judged as unqualified.

8 Requirements for Writing User Manual

The user manual should be in accordance withGB 9969.1The user manual should include at least the following content:

a)Working principle of indoor fire hydrant;

b)Main performance parameters of indoor fire hydrants;

c)Installation, use and maintenance instructions, precautions;

d)after-sale service;

e)Name and detailed address of the manufacturing unit;

f)Implement standards.

9 Marking, packaging, transportation, and storage

9.1 logo

9.1.1product logo

The model, specification, trademark or factory name should be cast on the valve body or valve cover of each product, and should not be cast in a protruding shape on the hexagonal surface of the valve body. Text, symbols, graphics, etc. should be intuitive and eye-catching

9.1.2packaging mark

The product packaging box should have the following markings:

a)Product name, model, manufacturing date, and product number;

b)Name and address of the manufacturing plant;

c)conform toGB/T 191Required storage and transportation diagram markings;

9.2 packaging

9.2.1When packaging indoor fire hydrants, the valve disc should be closed and rust proof grease should be applied to the threads.

9.2.2Wrap the indoor fire hydrant in paper or plastic bags and pack it in a hard paper packaging box. Depending on the specifications and models, assemble several boxes into one packaging box, seal it, and tie it with strapping. The strapping should be firm and reliable.

9.2.3The packaging box should contain the following technical documents:

a)Qualification certificate of product inspection;

b)Product manual;

c)Random attachment list;

9.3 transportation

Indoor fire hydrants should be protected from rain, collisions, and heavy pressure during transportation and loading/unloading.

9.4 storage

Indoor fire hydrants should be stored in a dry and ventilated room to prevent moisture, and should not be inverted or exposed to corrosive gases.