Pro and Cons of Using a Malleable Iron Pipe

While malleable iron pipe fittings may sound old-fashioned next to lightweight PVC pipe, it has become valuable once more for solar heating systems, and other applications. Learn more about the pros and cons of malleable iron pipe below.


Pros of Malleable Iron Pipe


Malleable iron pipe fitting is the conduit system of choice for solar heating systems. Most solar heating systems for interior heat and hot water supplies use a dense fluid to trap solar energy. This fluid becomes much too hot for PVC pipes to tolerate, but malleable iron pipe is ideal to transport it. All the fittings of a solar heat system can be made of malleable iron pipe. Malleable iron pipe fitting is also best for cold water plumbing, as it retains its shape in the coldest conditions. Malleable iron is used for galvanized pipe fittings and can be zinc coated for rust and corrosion prevention prior to installation in a plumbing system.


Cons of Malleable Iron Pipe


Malleable iron pipe fitting without a galvanized zinc coating is unsuitable for factories and fluid transport facilities located near ocean and lake docks. It can rust and corrode on exposure to salt and other waterborne minerals. Heavy malleable iron pipe has been replaced by PVC for household plumbing.


If you need more information about malleable iron pipe fittings, visit the website of Golden Highope: to find pipe fittings you need.



Article Source:

How to Disconnect a Galvanized Pipe Fitting

Contemporary plumbers use copper and CPVC pipes to plumb residential water lines, but it’s still common to find galvanized steel water pipes in older homes and outdoor water lines. Galvanized pipes come in diameters from 1/2 inch to 8 inches, with 2-inch and larger pipes normally reserved for industrial use. The threaded pipes connect with threaded fittings. When you need to remove a fitting, you sometimes have your work cut out for you.


Single-Port Fittings

The concept with single-port fittings is simple: tighten your wrench around a spigot or cap connected to a galvanized pipe, and turn it counterclockwise to remove it. The reality is seldom that simple, however, because you will usually find the fitting rusted in place. At the very least, you’ll have to hold the pipe steady with one pipe wrench while you turn the fitting with another. You will need muscle power, too – lots of it. Once you get the fitting to move, the rest is easy, but you sometimes need to augment your best efforts with spray lubricant to accomplish removal.


Two-Port Fittings

Disconnecting a fitting with two ports, like a coupling or elbow, presents a dilemma. The question becomes how to loosen the fitting from one pipe without tightening it onto the other. The answer is that, to loosen the fitting from one pipe, you must first cut it loose from the other. You can cut through galvanized pipe with a hacksaw, but the job goes much faster if you use a reciprocating saw with a metal-cutting blade. Don’t forget to turn the water off before you cut into the pipe, or you’ll be dealing with an uncontrollable spray. You risk a scalding if the water is hot.


Tees and Crosses

The procedure for removing multiple-port fittings like tees and crosses is similar to disconnecting double-port fittings. You must cut all the pipes connected to the fitting but one. Making two cuts on each pipe to remove a small section gives you the clearance you need to turn the fitting. If you plan to replace the fitting, you’ll also have to replace the cut pipes, and replacing one extra pipe isn’t much more work. Therefore, it’s usually more expedient to simply cut all the pipes rather than trying to unscrew the fitting, which is probably locked onto the threads anyway.


Disassembling a Pipe System

When you assemble a system of galvanized pipes, you begin at one end and screw on pipes and fittings in order until you reach the other end. Disassembling the system is the reverse procedure, but you need a free end from which to start. That means cutting through at least one pipe unless there is a union somewhere in the system that you can take apart. When disassembling a system of old pipes that they won’t reuse, plumbers usually don’t go to the trouble of unscrewing them. They simply cut them apart with a reciprocating saw.


By the way, when mentioned galvanized pipe fittings, you maybe think where I can find them? The pipe fittings manufacturer that I recommend you is Golden Highope.


Golden Highope Industrial Inc. Ltd. offers galvanized and malleable iron pipe fittings, their products are designed, manufactured and shipped in compliance with API, ASTM, JIS, DIN, DAN, SMS and many other international quality standards from the spectroscopic tested. MECH is a China well-known brand of galvanized / malleable pipe fittings, which divided into two different series, American standard and British standard.


Learn more specifications of galvanized pipe fittings, welcome to visit Golden Highope’s website: Feel free to send inquiry to them.



Article Source:

Tell You Some Simple Introduction of Pipe Fittings

The components used in a piping system to connect the various sections of the pipe in order to change the direction of flow, are called fittings. Fittings are made from a number of materials including steel, bronze, cast iron, plastic and glass.


Standards have been established to ensure that fittings are made from proper materials and are able to handle the designed pressures. Some of the important functions of these fittings are:


  • Changing the direction of flow


  • Providing branch connections


  • Changing the size of lines


  • Closing lines


  • Connecting lines.


Fittings for Changing The Direction of Flow


To change the direction of flow, the pipe fittings that are normally used are referred to as elbows. Elbows generally come in all angles but those that are commonly used are the 45° and 90° ones.


Fittings for Changing The Size of The Pipelines


The function of the reducer is to reduce the line to a smaller pipe size. One reason for doing so is to increase the pressure in the system.


Pipe Joints


Pipe joints can be of the screwed, flanged or welded type. Each of these joints which are widely used, have their own advantages and disadvantages.


Screwed fittings are joined to the pipe by means of threads. The main advantage of the threaded joints is that the pipe length can be easily tailored at a later stage. As a threaded joint has metal-to-metal contact between the threads of two mating parts of the pipe, the risk of leakage is high. Hence sealing of the threaded joint becomes very important. The traditional method of providing a seal between the mating threads is to coat the threads with a paste dope. In recent years, the invention of Teflon sealing tapes has made for a more effective solution. The Teflon (being a registered trademark of Du Pont De Neumors and Company) tape can be simply wound over the threads for sealing.


Flanged fittings are either forged or made as cast pipe fittings. A flange is a rim or ring at the end of the fitting, which mates with another section of the pipe. Pipe sections can also be made with flanged ends. Flanges are joined either by being bolted together or by being welded together. The flanged faces again have metal-to-metal contact and proper sealing needs to be provided between the two mating surfaces to avoid leakages. A gasket is usually inserted between the mating surfaces of two flanges, which are bolted together. Normally, compressed asbestos gaskets can be used under conditions of normal pressure and temperature. However, when the system operates under higher pressure and temperature conditions, higher-grade gaskets are used.


Other pipe fittings used in flanged connections include expansion joints and vibration dampeners. Expansion joints have three functions:


  1. They compensate for slight changes in the length of the pipes, by allowing the joined sections of rigid pipes to expand or contract with changes in temperature.


  1. They allow pipe motion either to the side or along the length of the pipe, as the pipe shifts after installation.


  1. They help dampen vibration to some extent and reduce the noise carried along the pipe and originating from distant pumps.


It has a leak proof tube that extends through the bore and forms the outside surface of the flanges. Natural or synthetic rubber compounds are used for this purpose, depending on the type of application. Other types of expansion joints include metal bellows (corrugated type), spiral wound types and slip joint types.


Vibration dampeners are designed specifically to absorb vibration because vibrations reduce the life of the pipes as well as the operating equipment. They also eliminate line noises carried by the pipes.


Wellgrow Industries Corp. is the professional cast pipe fittings and other stainless fittings manufacturer in the industry. If you are interested in learning more information about pipe fittings, try to visit the website of Wellgrow to see what products they can offer you!



Article Source: