How to Handle the Most Common Polypropylene Storage Tank Issues?

Polypropylene storage tanks are widely used in various industries for storing aggressive materials and chemicals. However, like any other storage system, they are prone to common issues that can compromise their performance and longevity. Handling polypropylene tanks requires proper knowledge of their material properties, installation, maintenance, and repair. In this blog post, we will provide a comprehensive guide on how to handle the most common polypropylene storage tank issues.

Addressing Compatibility Issues

Polypropylene storage tanks are a popular choice for storing a variety of substances due to their durability and chemical resistance. However, not all chemicals are compatible with polypropylene, and it's important to check with the manufacturer before filling up your tank. 

Strong acids or bases can corrode polypropylene, and even compatible chemicals can weaken the tank over time through plasticization. 

To prevent this, make sure not to exceed the maximum recommended storage temperature for your tank and substance. If polypropylene isn't the right choice for your needs, consider other materials like stainless steel, fiberglass, or high-density polyethylene (HDPE). Proper handling of polypropylene tanks is crucial for safe and efficient chemical storage.

Avoiding Contamination

When handling polypropylene tanks, it is important to take proper precautions to avoid cross-contamination and ensure the longevity of the tank. To avoid cross-contamination, only store one type of chemical in a polypropylene tank at a time. Thoroughly cleaning the tank between uses is also important. Flush it with a compatible solvent and then rinse it with water. Let all parts air dry completely to remove any remaining residue before refilling.

With care and proper maintenance, a polypropylene storage tank can provide safe containment for years. Doing compatibility checks, monitoring temperatures, preventing a mixture of chemicals and routine cleanings will help ensure your tank stays in good working order and avoids premature damage or failure. Thus at the time of polypropylene tank handling taking these precautions will help you to get the most value from your investment and avoid costly repairs, replacements, or accidents.

Properly Venting For Pressure And Vacuum

Proper venting is key to avoiding pressure buildup that could damage your tank. You'll want to install a pressure/vacuum vent, also known as a PVV. This allows air to escape when the pressure inside the tank gets too high but also lets air back in when there's negative pressure.

For most polypropylene tanks, a PVV that opens at around 2 to 3 psi should work well. Make sure to mount the vent at the highest point of the tank roof. This allows any built-up gas to easily escape. You'll also want to choose a vent specifically intended for chemical storage, as it will have the proper seals and materials to handle fumes.

In addition to a PVV, you may need an emergency pressure relief valve or EPRV. This high-capacity vent opens if pressure spikes quickly. It should be rated for at least the maximum pressure your tank can handle. An EPRV prevents catastrophic failure in case of a process upset.

Don't forget a vacuum breaker to prevent tank collapse from negative pressure. This one-way valve lets air in but not out. Mount it near the bottom of the tank, opposite the PVV.

You may want a conservation vent to maintain a slight positive pressure and prevent outside air from entering. This specialized vent only cracks open at very small pressure differentials.

With the proper vents in place - PVV, EPRV, vacuum breaker, and possibly a conservation vent - your polypropylene tank will have the breathing room it needs to operate safely. Keep an eye on vent seals and test EPRVs regularly to ensure proper functioning. Your tank's life depends on it!

Proper Installation Of Tank Fittings

Proper installation of the fittings and components on your polypropylene storage tank is crucial to ensure safe and effective operation.

First, install the tank on a sturdy, level foundation that can support the total weight when full. Concrete pads are ideal, but you can also use gravel or sand. Make sure the foundation is flat and even so, the tank sits level. An unleveled tank can cause structural stress and prevent proper drainage.

Next, secure the tank to its foundation to avoid shifting or toppling. Strap the tank to concrete anchors or bolt it directly to the foundation. You should also install protective barriers like concrete bollards around the tank for added stability and to prevent impact damage.

All tanks require multiple fittings like manways, valves, pumps, and piping. Manways provide access inside the tank for cleaning and maintenance. Valves control the flow into and out of the tank. Pumps move the stored liquid to where it’s needed. Piping delivers the liquid to and from the pumps and valves.

When installing fittings and pipes, use high-quality, chemically-resistant materials that won’t corrode or contaminate the stored liquid. Tightly seal all joints and connections to prevent leaks. Provide isolation valves so you can shut off parts of the system when needed. Clearly label all pipes to avoid confusion.

Vents allow airflow in and out of the tank and prevent pressure buildup. Install at least two vents, positioned at opposite ends of the tank. Screens or filters over the vents will keep out insects, debris, and contaminants.

Following proper procedures when installing your polypropylene storage tank and its components will help maximize the safety, efficiency, and overall lifespan of the system. Take the time to do it right the first time, and your tank should provide many years of trouble-free operation.

Maintaining Proper Temperatures

Proper handling of polypropylene tanks involves maintaining the appropriate temperature levels to prevent issues and ensure safe operation. 

As a general rule of thumb, polypropylene has a maximum continuous operating temperature. Exceeding this temperature can cause the material to soften, melt, or warp which damages the structural integrity of the tank. High heat also speeds up the oxidation process, causing the plastic to break down faster.

When it comes to polypropylene tank handling, avoiding overheating, place your storage tank in a temperature-controlled environment. If located outside, provide shade from direct sunlight during warmer months. You can also install cooling equipment like exhaust fans, air conditioning units, or chillers to regulate the temperature.

Conversely, extremely cold temperatures can cause polypropylene to become brittle. For colder climates, you may need to install heating equipment to maintain minimum temperatures.

Fluctuating temperatures can be just as damaging. As temperatures change, plastics expand and contract at different rates which places stress on the material. Wide temperature swings accelerate fatigue and significantly reduce the lifespan of your storage tank. For the best results, keep temperatures consistent and avoid frequent or rapid changes.

Monitoring and controlling the temperature of your polypropylene storage tank is critical to maximizing its performance and durability. By maintaining moderate, steady temperatures within the safe operating range, you can avoid issues like warping, oxidation, brittleness, and fatigue - keeping your tank in working condition for years to come.

Annual Inspection And Maintenance of Polypropylene Storage Tanks

Annual inspection and maintenance are critical to the safe handling of polypropylene storage tanks. Regular inspections help identify potential problems proactively, which can prevent tank failure and environmental contamination. Here are some key points to consider when performing annual inspection and maintenance of polypropylene storage tanks:

• Empty the storage tank and neutralize any remaining chemicals before the inspection.

• Check the tank's secondary containment and venting system to ensure proper function.

• Perform inspections against approved drawings, specifications, and standards.

• Hire certified external inspectors for five-yearly inspections.

• Follow inspection guidelines and take necessary corrective actions to avoid unintended chemical release.

• Regular maintenance practices for polypropylene storage tanks to ensure longevity and performance.

• Check the compatibility of tank, fittings, and gasket material with stored chemicals and anticipated storage temperatures.

• Inspect tanks for damage and wear.

By following these guidelines, you can ensure the safe handling of polypropylene tanks and avoid costly surprise failures. Regular inspection and maintenance practices can extend the safe operating life of polypropylene storage tanks and help prevent environmental contamination.

Endnote!

Don't let common polypropylene storage tank issues get you down! By properly handling polypropylene tanks, you can avoid costly failures and environmental disasters. From aggressive materials to fitting failure, we've got you covered with expert tips and solutions. At Arvind Anticor, we're here to help you ensure safe and efficient chemical storage. So why wait? Request a free consultation today and let us help you handle your polypropylene storage tank issues like a pro!