![]() 7.14 clearly illustrates expansion joint. This joint is used at such places where pipes expand or contract due to change in atmospheric temperature and thus checks the setting of thermal stresses in the pipes. Now a days sometimes to reduce the cost of filling lead, certain patented compounds of sulphur and other materials are filled in the joints, but these materials do not provided flexibility equal to that of lead. This is somewhat slightly flexible joint allow the pipes to be laid on flat curved without pipe specials. dia pipe, to about 45-50 kg for 120 cm diameter pipe. The quantity of lead required per joint varies from 3.5 to 4 kg for 15 cm. The lead which shrinks while cooling is again tightened by means of chalking tool and hammer. When the lead has hardened, the runner is removed. The space between the hemp yarn and the clamp runner is filled with molten lead. The molten lead is then poured into the V-shaped opening left in the top by the clamped joint runner. Sometimes wet clay is used to make tight contact between the runner and the pipe so that hot lead may not run out of the joint space. ![]() After packing of hemp a gasket or joint runner is clamped in place round the joint so that it fits tightly against the outer edge of the bell. The hemp is tightly packed to maintain regular annular space and for preventing jointing material from falling inside the pipe. After this yarn of hemp is wrapped around the spigot end of the pipe and is tightly filled in the joint by means of yarning iron up to 5 cm depth. For the construction of this joint the spigot or normal end of one pipe is slipped in socket or bell end of the other pipe until contact is made at the base of the bell. ![]() This type of joint is mostly used for cast iron pipes. Sometimes this is called bell and spigot joint. Various types of joints which are mostly used in pipes are as follows: 1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |