3000 psi 3500?
it is W/C=.45 or W/C= .55 it is depends on the type of concrete
First you need the size of the pipe and the volume of water supply. Pressure will vary during usage. Standard well system operates between 20-40 psi and city systems operate from 50-70 psi.
The 'J' has to do with the heat treatment of the material, and the 55 is the minimum yield strength (MYS) of the material is ksi (or thousand psi)
well , reinforcement steel required for slab is nearly 0.7 to 0.8% of the volume of concrete so if concrete is 1 cum then steel will be 1*0.7/100 =0.007 but density of steel is 7850 kg/ cum so 0.007*7850=54.95 say 55 kg per cum so steel required to reinforce 1 cum concrete for slab is approximately 55 kgs.
This cannot be answered without knowing the width and depth.
According to AUTO ZONE in phoenix, the freon need it is 2.13 psi when empty. about 32 oz, gauge need to be calibated according the climet temeperature where you live @ : 65=25-35 psi 70=35-40 psi 75=35-45 psi 70=40-50 psi 85=45-55 psi 90=45-55 psi 95=50-55 psi 100=50-55 psi 105=50-55 psi 110=50-55 psi here some videos: http://www.efproducts.com/instructional_videos.html
4.6 Cubic yards
Must have no less then 55 PSI. and no more then 62 PSI. The specs. are 55 to 62 LBS. PSI.
35 - 55 psi
55
about 40 psi at idle, and 55-65 psi when driving
fuel pressure should be 48-55 psi
55 PSI to 62 PSI no higher are lower are you will have starting or running problems.
55 - 61 psi Drops 3 - 10 psi when started
48 to 55 psi, non turbo engine
55-60 psi
Required for what ? Factory specifications call for a minimum of 13 psi at warm idle. Approximately 10-30 psi at idles and 40-70 psi at 55 mph is considered normal.