Ideally
1- Every change of the direction greater then 45 deg
2- at the base of the stack / leader
3- Every 50 feet
4- At the main house trap
Water Jetting
ABOVE the sewer line and on an angle away
A 3 or 4 inch pipe sticking straight up out of the ground? This is the clean out for the sewer line. If sewage is coming out of it, this means the sewer line is clogged or collapsed from there to the main city sewer. If you have a septic tank, the tank is full and needs to be pumped out.
That would depend on where the block is located and the HJA
Yes, they can be opened for routine sewer and drain and leader cleaning
All clean outs have to be accessible or what is the purpose of installing them? They can be placed behind an access door or under a floor plate
A crown of a sewer refers to the highest point of the internal surface of a sewer pipe. It is the portion where water flows and is typically located at the top of the pipe's arch or curve. The crown is designed to facilitate the smooth flow of wastewater or stormwater.
Yes. The roof vent is usally located on the roof. If the vent is clogged, it can create numerous issues and prevent your plumbing system from working properly.
The way you ask this question is too broad. Which part of your sewer pipe needs replacing? Exposed pipe in your basement or crawlspace is too simple for you to be asking about. If you mean the sewer pipe that connects your house to the city sewer (generally under the street) you have a big task. Depending on what part of the country you are in, this section of your sewer pipe can be anywhere between 4 feet and 20 feet deep. In either case you'll need a backhoe to dig it up.
The purpose of a sewer pipe is to collect waste from drains and peoples homes and transport it through the sewer system to the sewer plant. There it is treated and the water is recycled.
No. You vent air from a sewer line.
That depends alot on your location and what codes your jurisdiction has adopted. From the 2006 International Plumbing Code, "water service pipe and the building sewer SHALL be separated by 5 feet of undisturbed or compacted earth." There are exceptions, 1. "the required separation distance shall not apply where the bottom of the water service pipe within 5 feet of the sewer is a minimum of 12 inches above the top of the highest point of the sewer and the pipe materials conform to Table 702.3. 2. water service pipe is permitted to be located in the same trench with a building sewer, provided such a sewer is constructed of materials listed in Table 702.3. 3. the required separation distance shall not apply where a water service pipe crosses a sewer pipe, provided the water service pipe is sleeved to at least 5 feet horizontally from the sewer pipe center-line on both sides of such crossing with pipe materials listed in Table 605.3, 702.2, or 702.3." So, no, there is no minimum separation IF the materials you are using bear the correct ASTM #. (Your building sewer pipe will probably have ASTM F 891 stamped on it.)