Gaskets and Packing An introduction to Gaskets Packing

40105-07 Gaskets and Packing An introduction to Gaskets Packing
O-rings

1.0.0 Introductory Review Gaskets Packing O-rings
Seals two flat mating surfaces. Rigid (non-moving) joints only. Packing Packed into a cavity (packing gland). Rigid, rotating, or sliding joints. O-rings Fits into a groove on one surface and compresses against the other surface. Rigid or rotating joints. Q1

SECTION 4 : FABRICATING GASKETS
How to Fabricate Gaskets General Layout Procedures 2, 4, 8, 16, 32, and 64 hole flanges 3, 6, 12, 24, and 48 hole flanges Odd-numbered hole flanges

4.0.0 Fabricating Gaskets Most gaskets may be purchased.
If a gasket is needed before it can be delivered, Or, if it cost is a factor: Gaskets may be cut easily on the shop floor.

4.1.0 Laying Out A New Gasket Specific details for
General layout procedures: These steps detail laying out the outside and inside diameters and the bolt circle. Note that these steps are the standard procedures to start making any gasket.

4.1.0 Laying Out A New Gasket General Layout Procedures Step 1:
Select the proper gasket material. Step 2: Measure the inside diameter of the flange. Measure the outside diameter of the flange. Measure the diameter of the BOLT CIRCLE.

4.1.0 Laying Out A New Gasket Explanation of Bolt Circle:
The bolt circle is the imaginary circle that is concentric with the flange diameters and passes through the centers of the bolt holes. The most accurate method of measuring the bolt circle is to: Measure from the outside edge of one hole to the inside edge of the hole that is directly across from the first hole. Q13

4.1.0 Laying Out A New Gasket Bolt Circle:

4.1.0 Laying Out A New Gasket Step 3: Step 4:
Divide each diameter by 2 to determine the radius of each circle. Step 4: Draw a line horizontally (left to right) across the center of the gasket material. Draw a point on the line in the center of the gasket material. This point is the “Center Mark”. You do not have to be exactly in the center of the gasket; just close to it.

4.1.0 Laying Out A New Gasket Step 4:

Set compass to the dimension of the outside radius of the flange. Step 6: Set the compass point on the center mark. Draw a circle. This circle is the outside diameter of the flange.

Set compass to the dimension of the inside radius of the flange. Step 8: Set the compass point on the center mark. Draw a circle. This circle is the inside diameter of the flange.

Set compass to the dimension of the bolt circle radius of the flange. Step 10: Set the compass point on the center mark. Draw a circle. This circle is the bolt circle diameter of the flange.

4.1.0 Laying Out A New Gasket Step 10: Outside Diameter Bolt Circle
Inside Diameter

Set compass to a dimension that is just less than the outside diameter of the flange. Step 12: Set the compass point on the left-side intersection of the horizontal line and the outside diameter of the flange. Draw an arc above and below the outside diameter of the flange.

Keep the compass set to the same dimension. This is very important to accurately bisect the angle. Step 14: Set the compass point on the right-side intersection of the horizontal line and the outside diameter of the flange. Draw an arc above and below the outside diameter of the flange.

4.1.0 Laying Out A New Gasket Step 15:
Note that the two top arcs intersect. Note that the two bottom arcs intersect. Draw a vertical (up and down) line from the top intersection of the arcs to the bottom intersection of the arcs. If you have accurately bisected the angle, this line will precisely pass through the original center mark. If not, erase arcs and start over.

4.1.0 Laying Out A New Gasket Step 16: To draw the bolt hole:
Measure the diameter of the bolt hole on the flange. Divide by 2 to obtain the radius. Set compass to this radius. Side Note: As a general rule, flange bolt holes will be 1/8” larger than the nominal diameter of the bolt.

4.1.0 Laying Out A New Gasket Step 17:
This step details the layout of the bolt holes. 17-2B is step 17 for a 2-bolt (2B) flange. 17-4B is step 17 for a 4-bolt (4B) flange. 17-6B is step 17 for a 6-bolt (6B) flange. And so on.

2, 4, 8, 16, 32, and 64 hole flanges:

4.1.0 Laying Out A New Gasket FOR A 2-BOLT FLANGE

4.1.0 Laying Out A New Gasket Step 17–2B1: For a two-bolt flange:
Set compass point on the intersection of the left side of the bolt circle and the horizontal center line. Draw the bolt hole. Set compass point on the intersection of the right side of the bolt circle and the horizontal center line.

4.1.0 Laying Out A New Gasket Step 17–2B1: 2-Bolt Flange 360/2=180
Holes are 180* apart 2-Bolt Flange

4.1.0 Laying Out A New Gasket Step 17–4B1: For a four-bolt flange:
Set compass point on the intersection of the left side of the bolt circle and the horizontal center line. Draw the bolt hole. Set compass point on the intersection of the right side of the bolt circle and the horizontal center line. Set compass point on the intersection of the top of the bolt circle and the horizontal center line. Set compass point on the intersection of the bottom of the bolt circle and the horizontal center line.

Holes are 90* apart

4.1.0 Laying Out A New Gasket Step 17-8B1:
To layout bolt holes for an 8-hole flange: Follow steps for laying out a 4-hole. Step 17-4B1. When four holes are drawn, then proceed to the next step:

To layout bolt holes for an 8-hole flange: Set compass point on the center mark of the top hole. Set the pencil on the center mark of the right hole. Draw an arc up and to the right. Draw up until you are about even with the top hole.

4.1.0 Laying Out A New Gasket Step 17–8B2: 8-Bolt Flange

To layout bolt holes for an 8-hole flange: Now reverse the compass for the same two holes: Set compass point on the center mark of the right hole. Set the pencil on the center mark of the top hole. Draw an arc up and to the right. Draw up until you are about even with the right hole.

To layout bolt holes for an 8-hole flange: Note that the two arcs intersect. Draw a line from this arc intersection to the original flange center mark.

To layout bolt holes for an 8-hole flange: Set compass to the bolt hole radius. Set compass point on the intersection of the line and the bolt circle diameter. Draw the bolt hole.

To layout bolt holes for an 8-hole flange: Steps17-8B2 through 17-8B5 Must be repeated three times: For the top and left bolt holes. For the left and bottom bolt holes. For the bottom and right bolt holes.

Holes are 45* apart

To layout bolt holes for a 16-hole flange: Follow steps17-8B1 through 17-8B6 to layout the first eight holes. Bisect each space between the eight holes to accurately layout the other eight holes. Follow the same basic procedures as outlined in Steps 17-8B2 through 17-8B6. Understand that there will twice as many.

4.1.0 Laying Out A New Gasket Step 17–16B1: 16-Bolt Flange 360/16=22.5
Holes are 22.5* apart

4.1.0 Laying Out A New Gasket Step 17-2 -4 -8 -16 -32 -64 Repetition:
Review Steps 17-4B, 17-8B, and 17-16B. Bisect 2 opposite holes to obtain 4 holes. Bisect 4 holes to obtain 8 holes. Bisect 8 holes to obtain 16 holes. Bisect 16 holes to obtain 32 holes. Bisect 32 holes to obtain 64 holes. And so on it goes>>>>>>>>>

3, 6, 12, 24, and 48 hole flanges:

To lay out holes for a 6-bolt flange: To accomplish this, it is absolutely necessary that you understand: The radius of a circle will chord the circumference exactly 6 times.

Set the compass to the bolt hole radius. Set compass point on the intersection of the horizontal center line and the left side of the bolt circle diameter. Draw the bolt hole.

Set compass point on the intersection of the horizontal center line and the left side of the bolt circle diameter. Set compass pencil on the original center mark. Draw an arc up and to the left until the arc crosses the bolt circle diameter.

Set compass point on the intersection of the first arc and the bolt circle diameter. Draw an arc crossing the bolt circle diameter to the right of the first arc.

Set compass point on the intersection of the second arc and the bolt circle diameter. Draw an arc crossing the bolt circle diameter below and to the right of the second arc. Note that this arc crosses the intersection of the right side of the horizontal center line and the bolt circle diameter. If not, erase and start over.

Set compass point on the intersection of the third arc and the bolt circle diameter. Draw an arc crossing the bolt circle diameter below and to the left of the third arc.

Set compass point on the intersection of the fourth arc and the bolt circle diameter. Draw an arc crossing the bolt circle diameter to the left of the fourth arc.

Set compass point on the intersection of the fifth arc and the bolt circle diameter. Draw an arc crossing the bolt circle diameter to the left and above the fifth arc. Note that this arc precisely crosses the first starting point where the horizontal center line crosses the bolt circle diameter. If not, erase and start over.

Set compass to the radius of the bolt hole. Draw the remaining 5 bolt holes. Set compass point on the intersection of each arc and the bolt circle diameter. Draw each bolt hole.

Holes are 60* apart

To layout bolt holes for a 3-hole flange: Follow steps17-6B1 through 17-6B8 to layout six holes. This locates twice as many holes as you need, equally spaced on the bolt circle diameter. Erase every other hole.

Holes are 120* apart

To layout bolt holes for a 12-hole flange: Follow steps17-6B1 through 17-6B8 to layout the first six holes. This locates every other hole (six of them). Bisect each space between the six holes to accurately layout the other six holes. Follow the same basic procedures as outlined in Steps 17-8B2 through 17-8B6. Understand that there will six bisect operations.

Holes are 30* apart

4.1.0 Laying Out A New Gasket Step 17-3-6-12-24-48 Repetition:
Review Steps 17-6B, and 17-12B. Layout six holes for a six-hole flange. Erase every other hole to obtain 3 holes. Bisect the 6 holes to obtain 12 holes. Bisect the 12 holes to obtain 24 holes. Bisect the 24 holes to obtain 48 holes. And so on it goes>>>>>>>>>

Odd-numbered hole flanges:

4.1.0 Laying Out A New Gasket FOR A ODD NUMBERED -BOLT FLANGE

4.1.0 Laying Out A New Gasket Step 17-Odd Number:
If you have a protractor, you can layout an odd-number (3,5,7, etc.) bolt pattern: Divide 360 by the number of bolt holes to obtain the angle between each hole. 360 / 3 = 120 degrees 360 / 5 = 72 degrees 360 / 7 = 51.4 degrees 360 / 9 = 40 degrees There are several 3-hole flanges; but, as a general rule, odd- numbered bolt holes, over 3, are not used on flanges. Q14

4.1.0 Laying Out A New Gasket Step 17–Odd: 5-Bolt Flange 144 72
360/5=72 Holes are 72* apart

Gaskets and Packing An introduction to Gaskets Packing

Similar presentations

Presentation on theme: "Gaskets and Packing An introduction to Gaskets Packing"— Presentation transcript:

Similar presentations

About project

Feedback

Log in

Auth with social network:

Gaskets and Packing An introduction to Gaskets Packing

Similar presentations

Presentation on theme: "Gaskets and Packing An introduction to Gaskets Packing"— Presentation transcript:

Similar presentations

About project

Feedback