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Discussion on the Layout of Safety Valve and Its Piping Design

Discussion on the Layout of Safety Valve and Its Piping Design

brass  safety valve

The safety valve is the best overpressure protection device on the pressure equipment, the container and the pipeline. When the medium pressure rises above the allowable value, the safety valve will automatically open and then the total discharge will prevent the pressure from rising, thus protecting the equipment and its operation Personnel safety; when the pressure down to the specified value, the safety valve automatically closed in time to prevent the media continue to discharge, reduce losses. Since the safety valve is an automatic valve, it is often used as the last protection device for the pressurized device. In this sense, its role can not be replaced by other protective devices.

brass  safety valve

First, the safety valve layout
The safety valve should be mounted upright and as close as possible to the protected equipment or pipe. If not close to the arrangement, the total pressure drop from the protected equipment or pipe to the inlet of the safety valve shall not exceed 3% of the safe value of the safety valve or 1/3 of the maximum allowable opening and closing pressure Whichever is smaller), the pressure drop over the General Assembly will cause the safety valve to take off frequently. Engineering practice commonly used to reduce the pressure drop approach by the appropriate expansion of the safety valve inlet diameter, the use of long radius elbow, reduce the number of elbows to reduce the total pressure drop pipe.
Safety valve installation location should be mainly considered easy maintenance. Therefore, the safety valve should be set up maintenance platform, which can facilitate the piping is also easy to regularly check the safety valve, maintenance and calibration work. When arranging a heavy safety valve, consider the possibility of lifting the relief valve after disassembly. If necessary, install the boom and the site and space for the maintenance of the inspection. Engineering practice, the common practice is to install the safety valve in the top of the tube. In this way, on the one hand, higher than the venting manifold, on the other hand the safety valve is arranged on the top of the pipe to facilitate maintenance.
If it is difficult to install on the container body for special reasons, it may be considered to be installed on the outlet pipe. However, the pipe between the safety valve installation and the container should avoid sudden bending and partial shrinkage. Resistance, causing the accumulation of dirt clogging and so on.

Second, the safety valve inlet pipe design

Safety Valve

Safety valve inlet pipe design should be short and straight, and should use long radius elbow. Pipes shall have a slope of at least 5% and a slope-protected system; the inlet pipe shall be compensated for the need for compensation within the operating temperature range. The inlet pipe should be avoided as far as possible to avoid the bag-shaped bend, if not avoided, then the condensable material in the bag-shaped low point of continuous flow of the drainage tube connected to the same pressure system, if the condensate is easy to become thick or solid, then this Drainage tube to heat; for non-condensable media, in the bag at the lowest bend is easy to close the operation of the release valve.

The minimum cross-sectional area of the channel of the inlet pipe shall not be less than the inlet cross-sectional area of the safety valve. For high pressure and large displacement applications, the inlet pipe should have a sufficiently large fillet radius at the inlet; or a tapered channel, the inlet cross-sectional area of the tapered channel is approximately twice the outlet cross-sectional area.

Safety Valve

The inlet pipe should be of sufficient strength and appropriate to increase the support of the support to withstand stresses caused by the combined action of the medium pressure, the temperature and the release of the safety valve, and to avoid the vibration of the equipment to the safety valve and to the seal of the safety valve.
Third, the safety valve outlet piping design

Safety valve outlet pipe design should consider the back pressure does not exceed the constant value of the safety valve. For ordinary spring-type safety valve, the back pressure does not exceed 10% of the safety valve constant pressure.

Safety Valve

For the liquid phase of the safety valve outlet pipeline should be as high as the venting manifold, mainly to avoid the condensate reflux affect the normal use of safety valve. The outlet of the safety valve should also be higher than the manifold when the medium discharged into the vent pipe or to the torch manifold with condensate or condensable gas. Otherwise, you should consider automatic drainage measures. Engineering practice generally through the drain pipe access tank and then through the pump or gas purge sent to the dispensing tank centralized treatment.
The outlet pipe of the safety valve discharged into the torch should be diverted to the top of the discharge manifold at a distance of 45 ° to prevent the condensate from flowing into the manifold and reduce the back pressure of the safety valve.
As the material is discharged, the discharge of the material will produce a certain force on the discharge pipe and through the discharge pipe to the safety valve, the resulting force and torque will be the equipment nozzle and safety valve inlet and outlet pipes have a negative impact, and even cause Safety valve seal leaked accident. It should be the safety valve outlet reaction calculation, and consider their own weight, vibration, wind load, thermal expansion and contraction factors such as set the appropriate support.
Fourth, the safety valve before and after the cut off valve and bypass valve settings
1. Set the valve before and after the safety valve
In the production, the safety valve replacement, the equipment is not necessarily cut off, so most enterprises in order to ensure production, in the safety valve before the installation of shut-off valve. The general should use a single gate valve, and sealed, the stem should be installed horizontally, so that the valve stem and valve plate connected to the corrosion or loose when the valve plate down. When the safety valve test expires, after the break after the break, you can close the safety valve inlet shut-off valve, remove the safety valve for calibration or replacement. According to the actual production experience, the main situation before the installation of the main closure valve:
1.1 safety valve in the normal production of the valve leakage and overpressure can not be reset after opening.
1.2 to facilitate the technical supervision department in the production of the safety valve for monitoring.
1.3 in the important equipment, processes directly affect the production system of the start and stop, to the enterprise caused economic losses.
1.4 Equipment and devices for the production or storage of contaminants or dangerous gases and liquids.
For safety valves that are discharged to the torch or enclosed system, even if the outlet pipe does not need to be provided with a bypass, a shut-off valve is normally installed on the outlet of the safety valve and sealed to allow the safety valve to be damaged. , Otherwise the entire torch or closed system should be shut down.
2. Safety valve bypass setting
The safety valve bypass setting is not required. The purpose of the safety valve bypass is to allow the safety valve to protect the equipment and the system without downtime to repair the safety valve. Only those important safety valves that require on-line maintenance and no downtime need to be provided with a bypass. It is not necessary to set the bypass if the equipment and system protected by the safety valve can be serviced during the shutdown operation of the safety valve failure. Another effect of the bypass is to open the bypass purge to the torch system when the equipment and the system are purged during open shutdown.

The safety valve bypass is installed on the outside of the shut-off valve of the inlet and outlet valves of the safety valve (between the bypass and the safety valve), which is generally the same as the inlet pipe; it is best to install a pressure gauge on the pipeline near the safety valve, This allows you to monitor system pressure at any time.

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