New content on “Ask Grohe” Page

We are please to announce that we have new and updated content on the “Grohe – Ask the experts” page for December 2008. The old content is captured in this post for your reference.

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Previous Questions : Courtesy Grohe India Private Limited

1. What causes the water temperature to change in the shower when someone flushes in the toilet or runs another water appliance in the house?

MR Rubin Mehta – Washi – Navi Mumbai

The possible reasons can be

– Differential hot and cold pressures
– Geyser is not connected with pressurized line
– Insufficient header line

During installation of pipe lines it is important to use pipes with enough volume and pressure so that many fixtures can be used at the same time. Running two fixtures is recommended on a 1/2″ line. So a standard bathroom would have a 3/4″ line for cold header line and a 1/2″ line for the hot water is sufficient.

2. What does a vent do for the plumbing system?

Varsha Usgaonkar, Interior designer, Navi Mumbai.

A plumbing system vent is basically used to “vent” the gasses off plumbing system in home or a commercial building. If you want to see a plumbing vent, look from your roof approximately 12″  high. For every pipe that goes down, one needs to go up. The obvious reason we have vents is that sewer gases need to be vented outside the dwelling. When water goes down a pipe, air needs to follow it.  Without the vent pipe, the draining liquid will try to such air through P-traps, Nahani traps, water seal of W.c. etc. If the air is sucked through any of the plumbing fixtures, the fixtures become dry or no water seal which will result in unbearable smell in house coming from the now dry seal on the P-Trap. Hence it is imperative that the waste and vent system should keep sewer gas out of the dwelling and also drain every fixture well.

3. Our house was constructed 20 years back. I am facing a peculiar problem since last 3 months. When I turn on my health faucet, I get black and smelly water and after about a minute it clears up. Smell also comes in my bathroom basin tap or cold water. Surprisingly I do not have this problem in my shower area. What can be the possible reason?

Mr. M.C. Mohan, Chinmaya Nagar. Chennai.

This problem is common in old galvanized iron supply pipes. Water color is mostly (rusty) red but sometimes black due to accumulations inside the pipelines. It usually happens in both hot and cold lines and it flushes out after a minute. Water color does not change in the shower area as there may not be any accumulation in that particular pipe. If possible, visually inspect your pipes to see the amount of accumulation inside your pipelines. If you find that there is a lot of accumulation, replacing the pipes is the best option.

4. Is vitrifies tile better than marble or granite?

MR. Y.P.K. Reddy, Gajuwaka, Vizag.

Vitrified tiles have far superior properties compared to marble or natural granite because being a manufactured product their quality is controlled whereas in naturally occurring marble and granite good quality is just a natural thing. Vitrified tiles posses much better mechanical strength, scratch resistance, resistance to acids, alkalies and chemicals, resistance to staining etc. compared  to marble or natural granite.

5. Can I use compressed air to pressure test a plastic plumbing system?

Mr. Vinod Chauhan, Project Engineer. Navi Mumbai.

No, unless the procedure being used has been clearly and explicitly approved by the manufacturer(s) of the plastic products or system being tested. Compressed air contains a large amount of stored energy that presents a serious safety hazard, should the piping system fail for any reason. The uncalibrated pressure gauge of the pressure system may also cause serious problems.

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