Can a safety valve on a pressure vessel be installed on a short pipe connected to the vessel?

It’s possible, but pay attention to the diameter of that short tube and whether it is connected to the gas phase space inside the container

It is possible, but it is necessary to ensure that the dimensions of the short tube meet the requirements for safe venting

Yes, but it is necessary to verify the back pressure at the inlet of the safety valve

It’s possible; many systems are installed this way, but it’s necessary to ensure that the diameter of the connecting pipe is not smaller than the diameter of the inlet pipe of the safety valve

1 The so-called installation of a safety valve on the pressure vessel itself is achieved by connecting the safety valve via a short pipe. 2 The specifications of this short pipe (inner diameter and cross-section) must be sufficient to accommodate the maximum discharge capacity of the safety valve. 3 When the safety valve activates, the airflow generates a bending moment at the base of the short pipe; therefore, the wall thickness and height of this short pipe must meet the strength requirements

Yes, 1. But be sure that the diameter of this short tube meets the requirements for safe discharge volume. 2. Also, check whether it is connected to the gas space of the inner container. 3. Pay attention to the direction of the safety valve’s discharge outlet

Provisions are set out in Chapter 4, Section 1 of Safety Management and Operation of Pressure Vessels

(4) The installation of safety valves must meet the following requirements: 1) Safety valves should be installed vertically, either in the liquid phase area of the pressure vessel or on pipes connected to the gas phase space of the pressure vessel. 2) The cross-sectional area of the connecting pipes and fittings between the pressure vessel and the safety valves must not be smaller than the inlet cross-sectional area of the safety valves; such connections should be as short and straight as possible. The cross-sectional area at the inlet of these connections should be at least equal to that of the safety valve inlets. 3) When two or more safety valves are installed at a single connection point on the pressure vessel… 4) It is generally not advisable to install stop valves between the safety valve and the pressure vessel. To enable online calibration of safety valves, a rupture disc device can be installed between the safety valve and the pressure vessel. For pressure vessels containing media with extremely high, high, or moderate toxicity, flammable media, corrosive or viscous media, or valuable media, in order to facilitate the cleaning and replacement of safety valves, a shut-off valve may be installed between the safety valve and the pressure vessel only with the approval of the technical person in charge of pressure vessel safety at the using unit, and after reliable preventive measures have been put in place. During the normal operation of the pressure vessel, the stop valve must remain fully open (sealed with a lead seal or locked); the design and diameter of the stop valve must not interfere with the safe venting function of the safety valve. For containers holding flammable, explosive, toxic, or viscous media, a globe valve can be installed to facilitate the replacement and cleaning of the safety valve. However, the flow area of this globe valve must not be smaller than the minimum flow area of the safety valve, and reliable measures as well as strict procedures must be in place to ensure that the globe valve remains fully open during operation. 5) The installation location of the safety valve should facilitate inspection and maintenance. 6) Safety valves installed in outdoor environments must have reliable measures to prevent water inside the valve from freezing in winter. 7) A safety valve equipped with an exhaust pipe; the minimum cross-sectional area of the exhaust pipe should be greater than that of the safety valve’s outlet. The exhaust pipe should be as short and straight as possible, and no valves shall be installed on it. 8) When installing a lever-type safety valve, its valve stem must be kept in a vertical position. The bolts of all the inlet and outlet pipe connection flanges must be tightened evenly to prevent additional stress from being applied to the valve body, which could disrupt its concentricity and affect the proper functioning of the safety valve. (5) Before installation, the new safety valve must be adjusted according to its intended use before it can be installed and put into operation.

In addition, a safety valve and a root valve are also required