The nominal sizes of the ferrules is 8 mm, 10 mm, 15mm, 20mm, 25mm, 32mm, 40mm, 50mm and are manufactured in leaded tin bronze. The salient dimensions are as given in I.S. 2692. 10.0 Traps: The fittings which are placed at the end of soil pipes or sullage pipes to prevent the passage of foul gases from the pipes to the outside are called traps. Between every fixture and the waste line is a trap - a curved section of pipe that traps water within it. All types of traps maintain water seal between the pipe and the outside which does not permit foul gases to escape from the pipes. The trapped water forms an airtight seal that prevents sewer gas from entering the home. The efficiency of trap largely depends upon the depth of water seal. The water depth of water seal most commonly adopted in most trap is 50 mm. At the bottom of their curve, some traps have a clean-out plug that provides access to the trap, making it easier to clear out any clogs. Body Cap Washer plate and washer Copper washer Plug
130 PLUMBING FIXTURES 10.1 There are three main types of traps i.e. P type, Q type and S type. Out of these Q type is not seen very common. a) P-traps: Designed for waste lines that come out of a wall, P-traps are shaped like the letter P lying face down. They re located under sinks, tubs, and showers. b) S-traps: Designed for waste lines that come out of the floor, S-traps can sometimes allow sewer gas into the home. So installing S-traps in new homes are not recommended. 10.2 Types of traps based on their use:- a) Floor trap:- The traps which are used for admitting waste water from floors of the rooms, kitchens, baths etc. in to sullage pipe are called floor traps. Mostly these traps are P type. These are provided with cast iron/ galvanized /stainless steel gratings at the top to prevent the entry of solid and large sticky matters, into the drain pipe to avoid frequent blockage. These traps are also called as Nahani Trap. b) Gully traps:- This is provided at junction in the drainage system. There are two entry locations for these types of traps. Waste from bathrooms, kitchen etc. enter through horizontal inlet. Water from floor cleaning or from rain water system enters from top grating screen. These traps provide wider entry to flow, smooth surface, easy cleaning arrangements and deep water seal. The water seal is usually 50.00 mm to 75mm deep. The top is covered by cast iron/galvanized Room/kitchen sweepings C.I. grating at floor level Access gate Water level To house drain (sullage pipe) P-type S-type 180 o 92.5 o + 2.5 o
131 PLUMBING FIXTURES /stainless steel gratings to exclude the entry of coarser materials to avoid blockage. c) Intercepting traps:- The trap which is often provided at the junction of a house sewer at the junction of house sewer and a municipal sewer. This intercepts the foul gas from the municipal sewer, from entering into the house drainage system.
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- Fall '17
- Ralph Intal