6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Civil Services - Question 6 - 2020 - Paper 1

B brass compression joints are commonly used to securely connect copper pipes. They allow for easy installation and provide strong, leak-free connections.

Soldered joints are primarily used to join A copper pipes. This method involves melting a filler metal, tin, or solder to create a strong and durable connection.

The easiest way to cut PVC pipes is by using A pipe cutter. This tool is designed to make clean and precise cuts with minimal effort.

A thermoplastic is a popular form of polyvinyl chloride, commonly used due to its durability and resistance to environmental stress.

Joining method A is a Compression joint, and joining method B is an O-ring compression connection.

Method A (Compression joint) is used to connect pipes, ensuring a tight seal where movement is expected. B (O-ring compression connection) is more often used in areas where additional sealing is required to prevent leakage, such as in hydraulic pipes.

A is the overflow device of the bath. Its function is to allow excess water to flow out if the bath is filled beyond a certain level, thus preventing overflow and potential flooding.

The diameter of the pipe used for B is typically 22 mm.

The type of trap installed at C is a P-trap, which helps to prevent sewer gases from entering the living space.

If the inspection eye at D is not installed:

1. There will be no access to the pipe for maintenance.
2. It will not be possible to inspect for blockages, potentially leading to plumbing issues.

E is the water seal or water level indicator, which helps maintain the proper level of water in the trap, preventing odors.

1. The gradient of pipe installations must be correct, typically 1:40 or 1:60 to ensure proper flow.
2. The diameter of any drainage pipe must be adequate to carry the sludge effectively, generally at least 100 mm.
3. Pipes must conform to SABS standards to ensure durability and correctness in installations.

Refer to the diagram on ANSWER SHEET 6.5, ensuring proper junctions, branch pipes, and gully connections are indicated for effective waste management.

The symbol for a manhole is typically represented as a rectangle with a lid on top.

The symbol for a bidet could be represented by a simple rectangular shape with an indication for water supply.

The colour used on a house plan for existing drains is typically black.

The colour used on a house plan for waste-water pipes is usually green.

The purpose of a septic tank is to collect, decompose, and treat sewage from households. It allows solid waste to settle and be broken down by anaerobic bacteria, providing a solution for waste management in areas without a central sewage system.