D-LINE tube fittings are designed to provide a leak-freeconnection and applied in chemical, petrochemical, oilreineries, shipbuilding, power generation and pulp andpapers. The double ferrule design is a mechanism usedfor sealing and gripping tubing. Through the mechanicalfor sealing and gripping.

INTRODUCTION

When the nut is tightened, the black and front ferrulesmove axially, The axial movement does not allow anytorque transfer from the fitting to tubing and the mechani-cal properties of tubing are maintained. The front ferrulecreates a seal against the fitting body and on the tubingoutside diameter while the back ferrule axially advancethe front ferrule and radially provides an effective tube grip.

FEATURES

D-LINE twin ferrule tube fittings are made of 316 stain-less steel and supplied in imperial size from1/8” O.D. to 1” O.D.

MATERIAL

316 Stainless steel: -321 °F TO 1200°F (-196°C to 649°C)TEMPERATURE

In order to ensure reliable and leak-free installation, tub-ing should be considered as one of fitting components.

TUBING

FRACTIONAL TUBING

0.028”0.028”0.035”0.035”

1/8”1/4”5/16”3/8”

TUBING O.D.NOMINAL

MIN. WALLTHICKNESS

TUBING O.D.

1/2”5/8”3/4”1”

NOMINALMIN. WALLTHICKNESS

0.049”0.065”0.065”0.083”

NPT, BSPT (BS21) and ISO7/1 taper threads must use athread sealant and proper lubrication to provide leak-freeconnection and prevent from galling that is mostly cormonin stainless steel.

SEALINGTaper Thread

No reverse angle is used. A self centering taper is used at hex wich centers a “Bonded” washer seal ( usually metal andelastomer” to seal the surface surrounding the female thread.

Form A

A metal gasket (usually copper) gasket performs the sealingbetween the face of body and the surface surrounding thefemale threads

Form B

tube fitting

The working pressure varies depending on temperature.The working pressure at various temperatures can beobtained by multiplying the working pressure at ambienttemperature (-20°F to 100°F or -29°C to 37°C) by thetemperature derating factor in the table below.

TEMPERATURE (°F)

100200300400500600700800900100011001200

316 SS

1.001.001.000.960.900.850.820.790.780.760.620.37

MAXIMUM ALLOWABLE WORKING PRESSURE TABLEFully annealed austenitic type 304 or 316 seamless tubing ASTM A269 or ASTM A213, or equivalent.Tubing to be free from dirt, scratches, weld seam, draw mark and suitable for bending and flaring.Recommended hardness: 80 HRB or less.

STAINLESS STEEL TUBE INCH SIZE

1/8”1/4”5/16”3/8”1/2”3/4”7/8”1”

TUBE O.D. (INCHES)

TUBE WALL THICKNESS IN INCHES

0.0497,5005,8004,8003,7002,4002,000

0.065

10,2008,0006,5005,1003,3002,8002,400

0.03510,9005,1004,0003,3002,600

0.083

6,7004,2003,6003,100

For gas service, applyingthe wall thickness only onoutside of shade boundary

- Allowable stress of 20,000 psi between -20°F and 100°F and (-29°C and 37°C) based on ultimate tensile strenght 75,000 psi

- Based on minimum wall thickness and maximum O.D. allowable by ASTM A269

NOTE:1. Pressure calculations are based on maximum O.D. and minimum wall thickness without allowance for corrosion and erosion.

2. Figures shown are not for design purpose but for reference only. The accuracy of information here is not liability of outcompany.

tube fitting

D-LINE two ferrule tube fittings are supplied finger tight and readyfor immediate use. A leak tight and mechanically safe installation iseasily made by turning the nut 1.1/4 turns or 3/4 turn for a smaller sizein 1/8” O.D.Prior to installation, make sure to have tubeend cut 90 degree andremove burrs from inside and outside tube ends.

INSTALLATION INSTRUCTIONS

1. Insert well prepared tubing into D-LINE two ferruletube fittingsuntil tubing end is firmly seated on the bodyshoulder.

2. Mark the nut at position no. 6 for identificationof starting point to count the number of turns

3. When holding the fitting body with a wrench toprevent the body from turning, tighten the nut withanother wrench 1.1/4 turns to position no.9.

Note:It is the responsibility of users to use the productsfor their specific application and adequately applysealant and lubrication to system installation.

Improper installation or intermixing components ofother manufacturers may cause personal injury orproperty losses.