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# Pipe Weight by Surface Area

## Pipe Weight by Surface Area

(OP)
Good Day Everyone,

Could someone help me calculating the weight of pipe because the painting company is calculating the price through surface area of pipe and its weight and weight of the paint in microns.

Example Given are:

Pipe OD is 0.53 m2/Meter
Pipe Thickness is 7.11 MM
Pipe Weight 28.83 Kg/Meter
Pipe Length is 6,000 MM

Paint Micron is 1 Micron = 7.625 Grams

Please help me how to calculate the total weight of given above using 6,000 MM pipe length.
Also, it was painted by hot dipped galvanized including inside surface of pipe.

Thank you

JOHN

### RE: Pipe Weight by Surface Area

Overall painted area= 0.53*6000/1000=... m2
bare pipe weight= 28.83*6000/1000=... kg

Paint Micron is 1 Micron = 7.625 Grams (Paint thk is 1 micron = 7.625 gr/m2)

Paint weight= 7.625*0.53*6000/1000=... gr

### RE: Pipe Weight by Surface Area

newbee

Somethings rather strange here.

I've never heard of painting companies charging by weight of pipe.

Paint comes in thicknesses higher than 1 micron primer is often 25 and top coat 50-100 microns.

~Make sure you're not confusing "mils" ( 1/1000") with a micron

Why you need to paint galvanized pipe and also work out the cot for a 6 metre length of pipe is beyond me

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Pipe Weight by Surface Area

This almost sounds as if 6M long pipe segments for modules are being shipped to a facility for painting, but it's still odd, as LI says.

### RE: Pipe Weight by Surface Area

newbee,
Never heard of hot dip galvanising as "paint". Quote"Also, it was painted by hot dipped galvanized including inside surface of pipe". What type of brush do you use to paint a pipe with "hot dip galvanising" ?

### RE: Pipe Weight by Surface Area

Is that "Hot dip galvanizing" going to affect the fluid service (chemically contaminating) inside the pipe? Welding to sections, or bolting each spool to its mate? Instrumentation bosses and fittings and service connections all complete prior to galvanizing?

### RE: Pipe Weight by Surface Area

as shown, zinc coating is generally specified by weight, not thickness. However, not sure why you would galvanize a large diameter pipe.

#### Quote (FENCE SPEC)

Steel pipe is available in two grades: A or B. Grade A is zinc-coated with 0.54 kg per square meter [1.8 ounces per square foot] of zinc. Grade B consists of a zinc-coating with 0.27 kg per square meter [0.9 ounce per square foot]

### RE: Pipe Weight by Surface Area

For example, NFPA requires some foam piping to be galvanized.

### RE: Pipe Weight by Surface Area

Typical here for hot dip galvanising to be changed by the weight of thing being galvanised. For typical structural sections it works out fair. But thick sections would be in the galvaniser's favour and thin section better for the purchaser.

### RE: Pipe Weight by Surface Area

(OP)
It was mistake using about the word "paint", actual we did is we sent the pipe spool 6" at galvanizing company for hot dip galvanizing.
The service for the pipe is for Service Air use for chemical processing plant.

The galvanizing company is weighing the spool thru weight bridge ( the trailer will pass the weighing scale without spool and back again with spool) result weight is thru subtracting.

But we discuss with our seniors that we lost some money of this because the flange with 300 LB has too much weight but the surface is just small. same with the o'let.

As of now, we are finding calculation that would fairly give us the correct weight.

Maybe you could have any formula that can help us finding the correct weight of spool after galvanizing.
Pipe schedule is 40, length is 6000
micron after galvanizing is 131.

thanks everyone

### RE: Pipe Weight by Surface Area

To what accuracy is the cargo weighed?

### RE: Pipe Weight by Surface Area

PI x OD(mm) x 0.131 x 6000 = volume in mm3

Pipe OD doesn't change with pipe schedule, only ID

Volume x density of dried galvanising = weight.

Multiply by number of pipe spools.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Pipe Weight by Surface Area

Not exactly a good approximation, because the galvanizing company has to hot dip the (very heavy, but low surface area) 300 lb-rated flanges on each spool. On the other hand, each 300 lb flanges has much more surface area than its "apparent length" because of the OD, the sealing face, and the back face (and a few bolt holes) are all getting the galvanizing coating.

So: Do the real math. Calc the actual area of the pipe (inside and outside) per foot (or per meter). Calc the number of flanges, the exposed area of each flange, the total length of the straight "pipe" and elbows, the number of spools. It's your project, your company's profits being lost (? - Or maybe gained) by your your estimate that YOU need to defend. Just do the bloody math.

### RE: Pipe Weight by Surface Area

Hmmmn. If hot-dip galvanizing, the interior AND exterior of each 6 meter pipe spool is going to be coated. (Whether it needs galvanizing or not it's going to get coated to the thickness specified.)

So, what the is the OD and ID of the 6 meter schedule 40 pipe? (Hint: This is a homework assignment for the original poster.) How many 300 lb flanges are on each spool (2, probably).

The rest is simple algebra.

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