Views: 0 Author: Site Editor Publish Time: 2023-02-20 Origin: Site
ERA PVC-U gaskets are connected with gasket joints. These gaskets do not provide a mechanical bond but instead use the weight of the backfill to hold the connection in place. Sometimes the gaskets are part of the pipe (bell-end) while other times they are a separate fitting.
Procedure：
1. Pipes may be jointed out of the 
trench but it is preferable that connections be made in the trench
to prevent possible “pulling” of the joint.
2. Check that the spigot end, if cut in the field, has
a chamfer of approximately 12° to 15°.
3. Clean the socket, especially the ring groove. Do not use rag with lubricant on it.
4. Some pipes have captive rings which must not
be removed in the field. For all other rubber ring joint types, clean and dry the ring and ring groove and insert the rubber ring into the groove as shown on the label.
5. Run your finger around the lead-in angle of the rubber ring to check that it is correctly seated, not twisted, and that it is evenly distributed around the
ring groove.
6. Clean the spigot end of the pipe as far back as the witness mark. Ensure all burs are removed.
7. Apply jointing lubricant to the spigot end as far back as the witness mark and especially to the chamfered section. Note: Keep the rubber ring and ring groove free of jointing lubricant until the joint is actually being made.
8. Align the spigot with the socket and apply a firm, even thrust to push the spigot into the socket. It is possible to joint 100mm and 150mm diameter pipes by hand. However, larger diameter pipes such as 200 mm and above may require the use of a bar and timber block as illustrated. Alternatively, a commercially available pipe puller may be used to joint the pipes. Joint so that the witness mark is just showing
9. Brace the socket end of the line so that previously jointed pipes are prevented from closing up
10. Inspect each joint to ensure that the witness mark is just visible at the face of each socket.
11. Pipe joints should not be pushed home to the bottom of the socket. The witness mark shows the optimum insertion depth. This is to allow for possible expansion of the pipe.
12. If a pipe joint is homed too far, it may be withdrawn immediately, but once the lubricant is dry (which takes only a few minutes in hot weather) mechanical aids are required to pull the joint apart.
13. With mechanical assistance, rubber ring joints can be recovered and remade years after the original joint was made. New rubber rings should be used and care should be taken to ensure that there is no damage to pipe or socket.
14. If the joint is likely to be dismantled in the future the task is much easier if silicone lubricant is used.
