The manual pressure testing pump is a tool used for conducting pressure tests on equipment such as pipes, containers, and valves. It is commonly employed for pressure measurement and leak detection in systems like floor heating, PPR water pipes, and fire protection pipes.
A typical pressure testing pump consists of a metal casing, a copper pump head, a pressure gauge, a manual operating lever, and connecting hoses. By operating the manual lever, the piston pump is driven to inject water or hydraulic oil under pressure into the pipe to be tested. The pressure gauge can display the pressure value in real time, which is used to determine whether the system can withstand the pressure and whether there is any leakage.
The manual pressure testing pump is small in size and easy to operate. It is widely used in scenarios such as home decoration, project acceptance, and industrial equipment inspection, and is an important tool for ensuring the safe operation of pipeline systems.
Many users often focus on the pressure range and pump body volume when choosing a pressure testing pump, but they may overlook its working medium.
lThe medium of the pressure testing pump is a crucial aspect that cannot be ignored in the selection of a pressure testing pump.
The selection of the medium for the pressure test pump mainly depends on the material, purpose, safety requirements and environmental conditions of the tested system. Water and oil are the two most commonly used media, each with its own applicable scenarios and limitations. The following is an analysis of their characteristics and usage environments:
lWater as a medium
Water is the most common pressure test medium, especially widely used in civilian and industrial pipeline systems.
1. Advantages: Non-flammable, non-toxic, low cost, easily accessible, extremely low compressibility, stable pressure transmission, and easy to observe leaks.
2. Applicable environments:
Civil building pipelines: such as PPR pipes, floor heating pipes, water supply pipes, fire protection pipes, etc.
General industrial pipelines: such as water treatment systems, cooling water systems, non-oil medium transportation pipelines.
High safety requirements scenarios: such as oxygen pipelines, food-grade pipelines, medical pipelines, etc. Using water can avoid the fire or explosion risks brought by gases or oils.
3. Limitations:
It cannot be used in "oil-avoidance" systems, such as oxygen pipelines, food-grade pipelines, medical pipelines, etc.
It needs to be protected from freezing in low-temperature environments, otherwise it will cause the pipeline or pump body to crack.
For stainless steel pipes, the chlorine ion content in the water needs to be controlled (typically ≤ 25 ppm) to prevent stress corrosion.
lOil as the medium
Oil-based media (such as hydraulic oil, mineral oil) are mainly used in specific industrial systems, especially in situations where lubricity, rust prevention, or sealing properties are required.
1. Advantages: Good lubrication, can protect the pump body and the measured system; strong rust prevention ability; suitable for high-pressure and high-viscosity systems; does not corrode metals.
2. Applicable environments:
Hydraulic systems: such as hydraulic stations, hydraulic cylinders, hydraulic valves, etc.
High-pressure equipment: such as pressure vessels, boilers, valves, etc., especially when pressure needs to be maintained or long-term testing is required.
High-temperature or low-temperature environments: the viscosity of the oil changes little, suitable for testing in extreme temperatures.
Systems without water: such as precision machinery, electronic equipment cooling systems, oil transportation pipelines, etc.
3. Limitations:
High cost, and requires specialized recycling and treatment, with high environmental requirements.
Flammable, with fire risk, must be kept away from fire sources.
Has swelling effect on rubber seals, need to ensure that the system sealing materials are oil-resistant.
lMedium selection basis:
1. System material: materials sensitive to chlorine ions such as stainless steel, copper pipes, etc., should avoid using water containing chlorine; rubber seals need to confirm whether they are oil-resistant.
2. System usage: systems for transporting water, gases, priority use water; systems for transporting oil, chemicals, can consider using oil or dedicated media.
3. Safety requirements: systems with flammable, explosive, toxic media, must use water or inert gas, strictly prohibit the use of oil or air.
4. Environmental conditions: in low-temperature environments, need to prevent freezing, can consider adding antifreeze or using oil; in high-temperature environments, need to consider the thermal stability of the medium.
lTest purpose: only requires short-term strength test, use water; requires long-term pressure retention or simulation of actual working conditions, can consider using oil.
lSummary
Water and oil each have their advantages and disadvantages. When choosing, one should consider the system material, purpose, safety, environment and cost comprehensively. Generally, water is the preferred medium as it is safe, economical and easy to operate; oil is used in specific industrial systems, especially in situations requiring lubrication, rust prevention and high pressure. If frequent changes of media are needed, it is recommended to equip two dedicated pumps, or select a compatible pressure testing pump, and strictly follow the cleaning and maintenance procedures.