PLUMBING MATERIALS.doc - PLUMBING MATERIALS INTRODUCTION...

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PLUMBING MATERIALS INTRODUCTION There are numerous kind of materials available for plumbing installation but so far,the most popular & commonly used are: 1. Cast iron soil pipe 7. Galvanized steel pipe 2. Acid resistant cast iron pipe 8. Galvanized wrought iron pipe 3. Asbestos pipe 9. Brass pipe 4. Bituminous fiber sewer pipe 10. Copper pipe 5. Vitrified clay pipe 11. Plastic or synthetic pipe 6. Lead pipe 12. Stainless steel pipe Not all of these materials enumerated however ,will be used in one plumbing system installation.The choice of the kind of pipe to be installed,depends upon the ffg considerations. 1. Quality & durability 2. Resistance to external & internal contact w/ foreign matters 3. Resistance to acid waste & other chemical elements that will pass into it. 4. Cost of materials & labor. Sometimes a combination of two or more types of plumbing materials,are used to suit the purpose intended for the installation,while availing of the advantages it offers to plumbing. CAST IRON PIPE For the past several decades,the most popular & generally specified materials for the drainage system in buildings is the cast iron pipe.It is durable,convienintly installed & answer to the most plumbing needs of all types of building less than 25 storey high.However building taller than 25 storey do not specify the use of cast iron pipe bec of constant vibrations w/c causes water leak of the pipe joints. To a certain extend,cast iron pipe is also affected by corrosion caused by the action of carbon dioxide,sulfur oxide & methane gases forming solutions of carbonic acid & sulfuric acid. These acids attack the metallic material causing a slow chemical reaction or oxidation to take place forming a ferrous oxide called rust. Cast iron pipes are of two types 1. The SV type w/c is generally used for building installation & 2. The XV type classified as the extra duty pipe used for underground installation Cast iron pipes has four varieties
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1. Standard pipe 3. Single hub pipe 2. Double hub pipe 4.hubless pipe ACID RESISTANCE CAST IRON PIPE- made from alloy of cast iron & silicon.It is widely used in chemical laboratories,industries & other installation where acid waste are being discharge.Basically,this type of pipe is brittle in character & requires stronger support for each pipe installated horizontally to prevent sagging of joints. ASBESTOS PIPE Asbestos pipe is made of asbestos fibers & Portland cement.The thickness of the pipe is twice as that of the standard cast iron pipe.Asbestos pipe could be used as soil,waste ventilation & downspout.This kind of pipe is remarkably superior for embedment in concrete structure for having the same material properties. Joints All joints are suitability grouted & firmly packed w/ oakum or old hemp rope.They are soaked in tar to be watertight & well secured w/ pure lead not less that 25mm deep,well calked or filled w/ cement mortar.For chimney joints mineral lead is replaced w/ cement mortar.
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