Guide To Fire Fighting Pipes and Fittings

Fire-fighting pipes and fittings are the most basic components of the fire-fighting system, connecting fire-fighting equipment, and delivering fire-fighting water. 

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Due to special requirements, the thickness and material of fire pipelines have special regulations, and they are sprayed with red paint. Fighting Pipes and Fittings must have the characteristics of pressure resistance, corrosion resistance and high temperature resistance.

Standardized fire piping facilities

As a standardized industrial product, fire pipes and fittings are strictly divided into different specifications. If buyers want to buy suitable products, they must have a clear understanding of these specifications. 

Now, let's follow this guide to learn what to look out for when selecting fire pipes and fittings.

1. Selection of Fire Fighting Pipe Types

Pipe type is an important factor affecting the quality of pipe grooved connections. Most of today's fire pipeline facilities are connected by grooves. For the advantages of grooved connections, you can refer to the following:

Grooved Couplings: The Fastest Way to Connect Pipe

The groove connection method is suitable for a wide range of pipeline types. "Technical Regulations for Grooved Connection Pipeline Engineering" (CECS151:) points out: "The groove connection method can be used for galvanized welded steel pipes and welded steel pipes, galvanized seamless steel pipes and seamless steel pipes, stainless steel pipes, etc.&#; However, since the form of the weld has a certain influence on the quality of the steel pipe groove connection, the weld seam of the welded steel pipe is prominent, which is not conducive to the pressure groove of the steel pipe. Therefore, seamless steel pipes should be the first choice during installation and construction, followed by straight seam welded pipes, and spiral welded pipes should be avoided. If it is necessary to use the spiral welded pipe, the corresponding grooved pipe fittings should also be used.

2. Quality requirements for Fire Fighting pipes

Since the grooved pipe fitting is engaged with the outer wall of the pipe, excessive deviation of the outer diameter of the pipe will cause the pipe to not match the clamp, which will cause the joint to seep. In addition, unqualified pipe material, weak galvanized layer, and insufficient thickness of the pipe wall may cause the pipe to break, the galvanized layer to fall off in large quantities, or the high-frequency weld to crack, which will eventually lead to water seepage or rupture of the joint. Therefore, strict control of pipe quality is essential. All kinds of pipes should comply with the corresponding national standards. For example, galvanized welded steel pipes should meet the requirements of "Galvanized Welded Steel Pipes for Low-Pressure Fluid Transport" (GB/T), and seamless steel pipes should comply with "Seamless Steel Pipes for Fluid Transport" ( GB/T), the plastic-coated galvanized welded steel pipe and the plastic-coated seamless steel pipe shall meet the requirements of "plastic-coated composite steel pipe for water supply" (CJ/T). In addition, the wall thickness of the steel pipe shall also meet the minimum wall thickness requirements.

3. Roundness control of nozzles

Insufficient roundness of the nozzle is an important reason that affects the quality of the pipe groove connection. Before construction, the roundness of incoming pipes should be checked. The inspection can be carried out according to the following methods: Divide the pipe section into 8 equal parts, measure 4 diameters respectively, and compare them with the standard value. Where the roundness is not up to standard pipe sections should be rounded or cut off. The roundness of the pipeline is not up to standard, which is often caused by the collision of the pipeline or the extrusion of the pipes during transportation or loading and unloading. China has good experience in pipe transportation. The engineers and technicians in this country have adopted the method of installing a cross support frame at the pipe end, which has solved the problem of pipeline compression and deformation, which is worth learning and popularizing.

4. Choice of sealing ring

The sealing ring used in the grooved pipe joint realizes the sealing performance of the system by increasing the pressure. From the cross-section, it belongs to the "C" type design. The higher the pressure, the better the sealing performance. The material used for the sealing ring can be determined according to the medium conveyed by the pipeline, and different materials have different letter codes on the sealing ring. For example, EPDM rubber (code E, black) is usually used in fire engineering systems; silicone rubber (code S, the sealing ring material of the pressure cooker, is milky white) for drinking water; Nitrile rubber (code D, orange); natural rubber (code N, black). Therefore, in fire protection projects, black EPDM rubber rings must be used.

Fire fittings with black EPDM seals

5. Rated working pressure of Fire Fighting grooved fittings

Rated working pressure refers to the maximum allowable working pressure of grooved fittings under working conditions, expressed in megapascals (MPa). At present, the rated working pressure of grooved fittings produced by various manufacturers in China is basically the same, namely, Grooved pipe fittings (such as elbows, tees, crosses, etc.) are generally 2.5Mpa; while threaded reducing tees and crosses; threaded mechanical tees and crosses; threaded flanges and other threaded pipe fittings are usually is 1.6MPa. The number of kilograms usually mentioned in engineering refers to the pressure of kilograms per square centimeter. Its code is Kgf/&#; 2, and its relationship with Mpa is 1Mpa&#;10 Kgf/ cm2.

The pipe fittings show a pressure capacity of 2.5MPA

6. Standard for grooved pipe fittings:

Chinese Standard: Grooved pipe fittings belong to the automatic sprinkler system, design standard GB .11-; technical specification GB/T -.

International Standard: American Design Standard AWWA C606; International Standard ISO .

Groove connection standard: ASME B36.10, ASTM A53-A53M, ISO.

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7. Material standard of grooved pipe fittings

China requires that the material grade should not be lower than QT450-10;

Tensile strength σb (MPa): &#;450

Conditional yield strength σ0.2 (MPa): &#;310

Elongation δ (%): &#;10

Hardness: 160&#;210HB

Chemical element content: carbon C: 3.70-4.00; Si: 2.15-2.93; Mn: 0.46-0.66; S: 0.010-0.016; P: 0.027-0.07; Mg: 0.027-0.050; Re: 0.026&#;0.043

Learn more

I believe that after reading this guide, you already have a certain understanding of fire fighting pipes and fittings. 

If you want to know more, please click the link below to enter the official website of Jianzhi Group, where there is more knowledge about fire pipe fittings.

https://www.malleableiron-pipefitting.com/industry-knowledge/ 

Pipe fittings are mainly used for connecting pipes of several diameters and sizes. Generally of ductile iron or carbon steel, fire sprinkler pipes and related fitting are made which are used for carrying water or other liquids to connect firefighting equipment. It is also known by the term fire protection fittings and pipes. Based on the corresponding rules and standards, the fire pipeline requires to be painted in red to make it separate from other pipeline systems. As the fire sprinkler pipe is usually installed in a static position, it needs a high level and restricts quality control. Fire sprinkler pipe and fittings required to possess good pressure resistance, corrosion resistance, and high-temperature resistance.

Pipe and fittings material types -

•         Carbon steel
•         Ductile iron
•         Stainless steel
•         Alloy steel
•         Composite or plastic pipe
•         Galvanized pipe
•         Available coatings -
•         Epoxy coating
•         Zinc coating

Features of epoxy coated fire pipe -

Fire pipe which comes with the external and internal epoxy coating is using the modified heavy epoxy powder that has good chemical corrosive resistance. In this way, for solving the problems like corrosive, surface rust, internal scaling, and others, and for preventing from blocking, prominently increases the fire sprinkler pipe's durability. Again, on the other hand, flameproof materials are added in the coatings for making fire sprinkler pipes heat resistance better than other types of pipes. So this makes even the working temperature increases rapidly will also not affect the fire pipe's performance. So for this firefighting pipes which has an internal and external epoxy coating which is much better than galvanized pipe on the durability and performance.

Determining the best connection for firefighting pipes

There are four types of connections for connecting fire pipe or fittings which are grooved, butt weld connection, flange connection, and threaded connection. You need to use fire sprinkler pipe fitting as the only the connection pipe fittings which complied with the right standards must be used in the event of any pipe diameter change in the fire pipe systems. Only the connection pipe fitting which complied with the right standards should be used in the event of any pipe diameter change in the fire pipe systems.

Firefighting Pipe Fittings -

Fire sprinkler pipe fittings types are similar to the general pipelines. In regards to the applications, there are tee, elbow, reducing tee, cross, caps, clamps, unions, and others. In regards to materials, there are alloy, carbon, stainless. With regards to connection types, it is the same as pipe connection types.

Grooved Fittings - Elbow, Tee, Cross, Reducer, Cap

For connecting standpipe to control fire pipeline, support in different directions and sizes, and distribute pipeline, grooved fittings are the best in the fire sprinkler pipe fittings. By using a groove connection, the project time is shorter with faster installations and easier maintenance.

Grooved Coupling

In a ductile iron grooved coupling, there are three parts which include, gasket, housing, and track head bolts along with nuts. They are majorly used in fire sprinkler pipelines. By the housing, the grooves of standpipe ends are engaged.  A sealed chamber with bolts and nuts tightened are formed by encompassing the gasket. This creates a leak-tight structure of a self-restrained pipe joint.

The industrial and economical development, fire sprinkler pipe and fittings are used widely in almost all types of industries and companies and they are extremely important for our daily lives. So you must definitely choose high-class firefighting pipes and fittings for your projects.

Dutco Tennant LLC has a wide collection of firefighting pipes and fittings. We are proud suppliers of products from frischhut and Zhucheng. With us you can be aware to get the most advanced range of solutions which will offer you with the best in class performance for all your projects.

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