Bellows Seal

Please explain to me how does a bellows seal works in the bonnet of a valve? Why is it needed? What are the factors in choosing the right one?? The simpler, the better.

Bit of Excel help

I am trying to make an excel worksheet that will summarise entries to other worksheets in the workbook. My problem is that I can find no variable reference methods ie I want the summary to list the next piece of data in a column taken from a monthly worksheet. The Monthly worksheet may have 1 to 3 h

Quality of water for concreting

I have sampled a source of water for concreting. The analysis is as follows:

pH-7.4; TDS- 626ppm; Total hardness- 220; TSS- NIL; Inorganic impurity- 516ppm; Organic impurities- 110ppm; Chloride content-180ppm; Phosphate content- Nil.

Please advise on the suitability of this water for concr

Finding Natural Gas Velocity

Dear all,

Request a simple answer for how to calculate velocity for natural gas in 2" inch SS316L pipe with 3164 kg/hr flow, inlet pr. of 30 barg & exit pressure of 24 barg, with route lenght of nearly 30 mtrs.?

how to read electrical schematics

I have been in the construction field for a couple of years as an electrical engineer. I have worked with electricians quite a bit. I have always been curious to learn how to read the electrical schematic drawings that they use. I know enough to understand what is meant when they are given a f

fire figthing calculation

Hi! I am a guest here in this forum. I was given the task of a fire fighting calculation. I am using elite software for this calculation. I am new in fire fighting design, My problem is where can I search for the value of, Static pessure test, residual pressure test and flow rate test. Is some one i

light magnetic balls

I am looking for light weight magnetic balls for a science demonstration for elementary school kids that I teach. magnetic coating on plastic balls or very light magnetic balls would be ideal. Is there a place I look for these?

suggestions will be greatly appreciated

Thanks

Pal

history of flat glass

Dear all, last evening I watched a movie about the 18 century,and there were shown windows with panes.I was amazed,because if I'm not wrong as i was a kid I a read book about the history of glass.

As much as I remember there was written that that the first flat glass manufacturing technology wa

Reading books during traveling?

I am sory for asking an out of forum question but I am wondering for its answer. It is generally said that reading books etc. is prohibited during sitting in bus and traveling on road because it has negative effects on eyes. Is it true?