Recent content by hahor

... is the contractor paid by the hour or does a unit rate contract apply?

advsign2, what kind of contract do you have? Progess Measurement is easy when you have a times & material contract based on Labor Time Values (John Page or any other system). But maybe that's beyond your control at this point in time. Kind Regards, hahor

Hello Physics, you may want to try the "Engineer's Approach": v = k * SQRT(delta p / density) Q = A * v Measure your flow rate at 5 different heights of the bottle, calculate "k", that's it. Kind Regards, hahor

Hello SShep, you may want to try this: http://eltherm.com/mod/Products/Heated+hoses+%7C+heated+sample+lines-CA.htm?id=150 Kind Regards, hahor

Admanderson, put the tank on load cells. Kind Regards, hahor

Hello ifran, try to get a copy of "Estimators Piping Man-Hour Manual" by John S. Page, Gulf Professional Publishing. This will answer most of your questions. Kind Regards, hahor

Hi Tinerfe, please do a Google search "john s page estimating manual" and you will see a whole bunch of books with labor time values. Amazon is a good source to obtain these books. Kind Regards, hahor

Hello Lukin, use a hydrometer for sufuric acid. Kind Regards, hahor

hello sarm, assume approx. 300 L/HR for a 1" line. Kind Regards, hahor

Hello RJB, you are right. Kind Regards, hahor

Hello RJB, just a quick answer, sorry about the outdated units. Heat of Solution for 1kg HCl: acid concentration [weight-%] 0.1% 485 kcal 25% 427 kcal 30% 408 kcal 35% 392 kcal 40% 374 kcal Kind Regards, hahor

Hello Iradah, - subscription to Chemical Engineering is for free - maybe you employer has a Subscription to Chemical Week or could arrange it for you - a 1967 analysis is definitely too old - M&S index is published on the “Economic Indicators” page of Chemical Engineering Magazine - To check if...

Hello Iradah, 1. better than nothing to start with: http://www.chemweek.com/services/engineering_and_construction/6233.html 2. Look up published data in Engineering & Economics Magazines like "Chemical Engineering" or "Chemical Week" and try to correlate capacity with capital cost; escalate...

Bryan, please have a look at the section "Feingewinde" https://www.wegertseder.com/pages/techdat/td7-gewinde.asp Kind Regards, hahor

Yobbo, why not just implement a minimum flow recycle line with a restriction orifice (Mindestmengenbypaß)? Just have a look at the pump curve and calculate an orifice diameter for pressure and flow conditions at the minimum duty point. When flow increases dp goes down and less flow will recycle...