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TOP
JoshuaEliot
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
Industry info
Wiki
Q&A
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Q
do pvc usually start because of stress
JoshuaEliot
PandoraChild
Release Time:
August 11, 2024, 4:26 AM
Premature Ventricular Contractions (PVCs) are extra heartbeats that originate in one of the heart’s ventricles and can indeed be triggered by stress, among other factors. The reason behind this is the body’s response to stress, which often involves the release of adrenaline and other stress hormones. These hormones can increase heart rate and modify the heart’s rhythm, sometimes resulting in PVCs. However, PVCs can also be caused by caffeine, alcohol consumption, and an imbalance of electrolytes, or they can occur without any identifiable cause. In most cases, PVCs are benign, especially in healthy individuals without underlying heart disease. However, if they are frequent or bothersome, or if you have heart disease, it’s important to speak with a healthcare provider for further evaluation and management. Lifestyle modifications, such as reducing stress and limiting caffeine and alcohol intake, may help decrease the occurrence of PVCs.
0
Q
is nylon and pvc the same
JoshuaEliot
TheresaBunyan
Release Time:
August 7, 2024, 7:34 PM
Nylon and PVC (Polyvinyl Chloride) are distinct materials with different chemical compositions, properties, and applications. Nylon is a synthetic polymer, a type of plastic derived from petroleum, known for its strength, elasticity, and resistance to abrasion and chemicals. It is widely used in the textile industry for making fabrics, ropes, and in various engineering applications due to its durability and flexibility. PVC, on the other hand, is a thermoplastic polymer that is rigid, durable, and resistant to environmental factors such as moisture, chemicals, and corrosive substances. It is extensively used in construction for pipes, doors, windows, and in healthcare for medical devices. PVC can also be made flexible and soft by adding plasticizers, expanding its use to include hoses, electrical cable insulation, and inflatable products. Despite both being plastics, their differences lie in their chemical structures, physical properties, and suitability for various applications, indic...
0
Q
what temp does pvc release toxins
BruceCarl
JoshuaEliot
Release Time:
August 7, 2024, 8:33 AM
Polyvinyl chloride (PVC) is a widely used plastic in various applications due to its durability and versatility. However, concerns have been raised about the potential release of harmful chemicals when PVC is subjected to high temperatures. PVC starts to decompose and release toxic substances, including dioxins and hydrogen chloride (HCl), at temperatures around 175°C (347°F). At these temperatures, the plastic begins to break down, leading to the emission of hazardous gases and particles. It’s important to note that the exact temperature at which PVC releases toxins can vary depending on factors such as the specific composition of the PVC material and the presence of additives like stabilizers and plasticizers. To minimize health risks, it is recommended to avoid exposing PVC products to high heat, especially in environments where people may inhale fumes or where the off-gassing could pose an environmental hazard. For instance, PVC should not be used in applications involving di...
0
Q
how is pvc electrical conduit measured
AndreBob
JoshuaEliot
Release Time:
July 26, 2024, 1:15 PM
PVC electrical conduit is measured primarily based on its inside diameter (ID) and outside diameter (OD), with the size typically referring to its ID. The OD is crucial for fittings and connections, ensuring a tight and secure assembly. Length is also a significant measurement, with conduits usually available in standard lengths, commonly 10 feet in the United States. Wall thickness can vary, affecting durability and protection level, categorized by Schedule (e.g., Schedule 40 or 80), with Schedule 80 having thicker walls and offering more protection than Schedule 40. Additionally, the conduit’s bend radius is important for installation, especially in applications requiring turns or curves. Accurate measurement ensures compatibility with fittings, ease of installation, and compliance with codes and standards.
0
Q
is a pvc a st depressin
JoshuaEliot
WalkerNorton
Release Time:
July 24, 2024, 2:30 AM
PVC, or Premature Ventricular Contraction, and ST depression are distinct entities related to heart electrical activity. PVCs are extra, abnormal heartbeats arising from the ventricles, causing an irregular rhythm. They can be felt as skipped beats or palpitations. On an ECG, PVCs are characterized by an early and wide QRS complex without a preceding P wave. On the other hand, ST depression is an ECG finding that indicates myocardial ischemia, where part of the heart is not receiving enough oxygen. It’s seen as a downward deflection of the ST segment from the baseline. While PVCs can sometimes be associated with underlying heart disease, they don’t directly cause ST depression. However, certain conditions can lead to both PVCs and ST depression, such as ischemic heart disease. It’s important for a healthcare professional to evaluate these ECG findings to determine their significance and whether they warrant further investigation or treatment.
0
Q
how deep to bury irrigation pvc
JoshuaEliot
LaurenSailsbury
Release Time:
July 20, 2024, 5:59 AM
The depth at which you should bury PVC pipes for irrigation purposes varies, but a general rule is to aim for 12 to 18 inches (30 to 45 cm) deep. This depth ensures the pipes are protected from traffic and most surface disruptions while reducing the risk of freeze damage in colder climates. For areas with light traffic or if you’re using the pipes for drip irrigation where the water is delivered at a lower pressure, you might opt for the shallower end of this range. However, in regions prone to frost, going deeper can help prevent the pipes from freezing and bursting. Local building codes and ordinances might also dictate specific requirements, so it’s important to check these before digging. Additionally, consider adding a layer of sand or fine gravel below and above the pipe to protect it from sharp rocks that could cause damage.
0
Q
what kind of nails needed for outside corner pvc molding
JoshuaEliot
MarvinSalome
Release Time:
July 13, 2024, 4:24 AM
When installing outside corner PVC molding, it’s important to choose the right kind of nails to ensure durability and a clean finish. Stainless steel or galvanized nails are recommended due to their rust-resistant properties, which are crucial for outdoor applications to prevent staining and degradation of the PVC. The nails should also have a small head to be less visible and easy to fill if necessary. Typically, a size of 6d (2-inch) nail is sufficient for securing PVC trim, but the exact size may vary based on the specific application and the thickness of the molding. It’s also essential to pre-drill holes to prevent the PVC from splitting, especially in colder temperatures. Choosing the right nails will guarantee that your PVC molding holds up well against the elements and maintains its appearance over time.
0
Q
a collector built from copper and pvc
JoshuaEliot
JillVirginia
Release Time:
July 13, 2024, 5:49 AM
A collector built from copper and PVC combines the thermal conductivity of copper with the durability and ease of assembly offered by PVC. Copper is a top choice for heat collection due to its high thermal conductivity, enabling efficient heat transfer. This makes it ideal for solar collectors or heat exchanger systems. PVC, on the other hand, is resistant to corrosion, provides good insulation, and is cost-effective, making it suitable for the structural parts of the collector. However, when building a collector with these materials, it’s important to consider the compatibility between copper and PVC, especially regarding thermal expansion and chemical resistance. Connectors or adaptors designed for this purpose can mitigate potential issues. Additionally, PVC’s maximum temperature tolerance is generally lower than copper’s, meaning the system’s operating temperature must be carefully managed to avoid damaging the PVC components. This combination can provide a ...
0
Q
does pvc glue go bad
JoshuaEliot
MaggieMaurice
Release Time:
April 18, 2024, 10:24 AM
PVC glue, also known as PVC cement, is a solvent-based adhesive used for bonding PVC pipes and fittings. It does go bad over time, losing its effectiveness due to solvent evaporation that occurs once the container is opened. The shelf life of an unopened can is approximately 2 years under ideal conditions, which include storage away from extreme temperatures and direct sunlight. However, once opened, its potency diminishes more quickly, and it’s recommended to use it within a year for optimal performance. Signs that PVC glue has gone bad include thickening or gelling of the cement, a pronounced change in color, or an inability to form a proper bond when used. To ensure the reliability of your PVC connections, it’s advisable to replace any glue that is suspected of being old or compromised.
0
Q
polyvinyl chloride toxicity symptoms
JoshuaEliot
BradyOliver
Release Time:
April 15, 2024, 5:20 AM
Polyvinyl chloride (PVC) is a widely used plastic in various applications, from plumbing to clothing. However, its production and disposal release toxins like dioxins, which can enter the human body through inhalation, ingestion, or skin contact. Acute toxicity symptoms may include respiratory distress, skin irritations, and in severe cases, central nervous system effects such as dizziness or headaches. Chronic exposure can lead to more serious conditions, including cancer, reproductive damage, and endocrine disruption. It’s crucial to handle PVC products with care, use protective gear in industrial settings, and dispose of PVC waste responsibly to minimize exposure risks.
0
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