Blog

by Nick Gromicko  from InterNachi

With barbecue season already here, homeowners should heed the following safety precautions in order to keep their families and property safe.

• Propane grills present an enormous fire hazard, as the Consumer Product Safety Commission (CPSC) is aware of more than 500 fires that result annually from their misuse or malfunction. The following precautions are recommended specifically when using propane grills:
  • Store propane tanks outdoors and never near the grill or any other heat source. In addition, never store or transport them in your car’s trunk.
  • Make sure to completely turn off the gas after you have finished, or when you are changing the tank. Even a small gas leak can cause a deadly explosion. 
  • Check for damage to a tank before refilling it, and only buy propane from reputable suppliers.
  • Never use a propane barbecue grill on a terrace, balcony or roof, as this is dangerous and illegal.
  • No more than two 20-pound propane tanks are allowed on the property of a one- or two-family home.
  • To inspect for a leak, spray a soapy solution over the connections and watch for bubbles. If you see evidence of a leak, reconnect the components and try again. If bubbles persist, replace the leaking parts before using the grill.
  • Make sure connections are secure before turning on the gas, especially if the grill hasn’t been used in months. The most dangerous time to use a propane grill is at the beginning of the barbeque season.
  • Ignite a propane grill with the lid open, not closed. Propane can accumulate beneath a closed lid and explode.
  • When finished, turn off the gas first, and then the controls. This way, residual gas in the pipe will be used up.

• Charcoal grills pose a serious poisoning threat due to the venting of carbon monoxide (CO). The CPSC estimates that 20 people die annually from accidentally ingesting CO from charcoal grills.  These grills can also be a potential fire hazard. Follow these precautions when using charcoal grills:
  • Never use a charcoal grill indoors, even if the area is ventilated. CO is colorless and odorless, and you will not know you are in danger until it is too late.
  • Use only barbeque starter fluid to start the grill, and don’t add the fluid to an open flame. It is possible for the flame to follow the fluid’s path back to the container as you’re holding it.
  • Let the fluid soak into the coals for a minute before igniting them to allow explosive vapors to dissipate.
  • Charcoal grills are permitted on terraces and balconies only if there is at least 10 feet of clearance from the building, and a water source immediately nearby, such as a hose (or 4 gallons of water).
  • Be careful not to spill any fluid on yourself, and stand back when igniting the grill. Keep the charcoal lighter fluid container at a safe distance from the grill.
  • When cleaning the grill, dispose of the ashes in a metal container with a tight lid, and add water. Do not remove the ashes until they have fully cooled.
  • Fill the base of the grill with charcoal to a depth of no more than 2 inches.

• Electric grills are probably safer than propane and charcoal grills, but safety precautions need to be used with them as well. Follow these tips when using electric grills:
  • Do not use lighter fluid or any other combustible materials. 
  • When using an extension cord, make sure it is rated for the amperage required by the grill. The cord should be unplugged when not in use, and out of a busy foot path to prevent tripping.
  • As always, follow the manufacturer’s instructions.

Safety Recommendations for General Grill Use

• Always make sure that the grill is used in a safe place, where kids and pets won’t touch or bump into it. Keep in mind that the grill will still be hot after you finish cooking, and anyone coming into contact with it could be burned.
• If you use a grill lighter, make sure you don’t leave it lying around where children can reach it. They will quickly learn how to use it.
• Never leave the grill unattended, as this is generally when accidents happen.
• Keep a fire extinguisher or garden hose nearby.
• Ensure that the grill is completely cooled before moving it or placing it back in storage.
• Ensure that the grill is only used on a flat surface that cannot burn, and well away from any shed, trees or shrubs.
• Clean out the grease and other debris in the grill periodically. Be sure to look for rust or other signs of deterioration.
• Don’t wear loose clothing that might catch fire while you’re cooking.
• Use long-handled barbecue tools and flame-resistant oven mitts.
• Keep alcoholic beverages away from the grill; they are flammable!

In summary, homeowners should exercise caution when using any kind of grill, as they can harm life and property in numerous ways. 

by Nick Gromicko  from InterNachi

Anti-scald valves, also known as tempering valves and mixing valves, mix cold water in with outgoing hot water so that the hot water that leaves a fixture is not hot enough to scald a person.

Facts and Figures

• Scalds account for 20% of all burns.
• More than 2,000 American children are scalded each year, mostly in the bathroom and kitchen.
• Scalding and other types of burns require costly and expensive hospital stays, often involving skin grafts and plastic surgery.
• Scalding may lead to additional injuries, such as falls and heart attacks, especially among the elderly.
• Water that is 160º F can cause scalding in 0.5 seconds.

Unwanted temperature fluctuations are an annoyance and a safety hazard. When a toilet is flushed, for instance, cold water flows into the toilet’s tank and lowers the pressure in the cold-water pipes. If someone is taking a shower, they will suddenly feel the water become hotter as less cold water is available to the shower valve. By the same principle, the shower water will become colder when someone in the house uses the hot-water faucet. This condition is exacerbated by plumbing that’s clogged, narrow, or installed in showers equipped with low-flow or multiple showerheads. A sudden burst of hot water can cause serious burns, particularly in young children, who have thinner skin than adults. Also, a startling thermal shock – hot or cold – may cause a person to fall in the shower as he or she scrambles on the slippery surface to adjust the water temperature. The elderly and physically challenged are at particular risk.

Anti-scald valves mitigate this danger by maintaining water temperature at a safe level, even as pressures fluctuate in water supply lines. They look similar to ordinary shower and tub valves and are equipped with a special diaphragm or piston mechanism that immediately balances the pressure of the hot- and cold-water inputs, limiting one or the other to keep the temperature within a range of several degrees. As a side effect, the use of an anti-scald valve increases the amount of available hot water, as it is drawn more slowly from the water heater. Inspectors and homeowners may want to check with the authority having jurisdiction (AHJ) to see if these safety measures are required in new construction in their area.

Installation of anti-scald valves is typically simple and inexpensive. Most models are installed in the hot-water line and require a cold-water feed. They also require a swing check valve on the cold-water feed line to prevent hot water from entering the cold-water system. They may be installed at the water heater to safeguard the plumbing for the whole building, or only at specific fixtures.

The actual temperature of the water that comes out of the fixture may be somewhat different than the target temperature set on the anti-scald valve. Such irregularities may be due to long, uninsulated plumbing lines or defects in the valve itself. Users may fine-tune the valve with a rotating mechanism that will allow the water to become hotter or colder, depending on which way it’s turned. Homeowners may contact an InterNACHI inspector or a qualified plumber if they have further questions or concerns.

In summary, anti-scald valves are used to reduce water temperature fluctuations that may otherwise inconvenience or harm unsuspecting building occupants.