Page 111 - Pipeline Rules of Thumb Handbook

98 Pipeline Rules of Thumb Handbook

Normal engagement between male and female threads to make tight joints

Normal engagement

The normal amount of engagement to make a tight joint
for various types of screwed material is given in the table.
These dimensions have been established from tests made
under practical working conditions.
The normal engagement specified for American Standard
Pipe Thread and API Line Pipe Thread joints is based on
parts being threaded to the American Standard for Pipe
Threads or the API Standard for Line Pipe Threads. Dimensions, in Inches
In order to obtain the thread engagements listed in the Dimensions given do not allow for variations in
table it is necessary to vary the torque or power applied tapping or threading
according to the size, metal and weight of material used. For Size A Size A
example, it requires considerably less power to make up a
screwed joint using a light bronze valve than a high pressure 1/8 1/4 2 1/2 15/16
steel valve. 1/4 3/8 3 1
3/8 3/8 3 1/2 1 1/16
1/2 1/2 4 1 1/8
3/4 9/16 5 1 1/4
1 11/16 6 1 5/16
1 1/4 11/16 8 1 7/16
1 1/2 11/16 10 1 5/8
2 3/4 12 1 3/4
Reprinted with permission—Crane Company

Hand-held computer calculates pipe weight, contents, velocity
Programs, written for the HP 41 CV computer equipped with printer, work with English or metric units
Frank E. Hangs, P. E., Sovereign Engineering, Inc., Houston

Pipeline engineers, accountants, and system operators are A printer is essential.
deeply involved with data concerning line pipe such as: Results for the WEIGHT category are calculated by an API
How much does it weigh (lb/ft, tons/mi)? What are the formula and given as: Pounds (mass) per ft; kg per m. Short
corresponding metric units? tons (2,000lb) per mile; metric tons per km.
How much will it contain (bbl/mi, gal/100ft, cu m/km)?
The content results are: bbl/mi, gal (U.S.)/100ft, cu ft/mi,
What are velocities at various feed rates (ft/sec, mi/hr,
L/m, cu m/km.
m/hr)?
The following program, written for the Hewlett Packard Flowrates can be input to give: b/h or b/d; gal
HP 41 CV hand-held computer, develops a lot of useful data (U.S.)/min; or gal/hr or gal/d; cu ft/min, /hr, /d; cu m/min,
for steel pipe for any outside diameter and wall thickness. /hr, /d.
Either English or metric units may be entered. Velocity results: mph; fps; km/hr; m/sec.