Twin Sphere Molded Rubber Expansion Joints (AJT Series)

Features

• Higher burst pressure ratings vs. AMT Series Rubber Expansion Joints
• Applicable for suction and delivery (discharge).
• Designed for greater compression, elongation, and angular movement than the single sphere expansion joint.
• Excellent for absorbing thermal expansion and eliminating sound and vibration.
• Gaskets and packing not required.
• Good electrical insulator.
• Absorbs water pulsation and minimizes water hammering.
• DIN PN10/PN16 drilled flanges available upon request (See DIN Flange section for dimensions)
• Working pressure ratings based on 4:1 safety margin (at 70°F).

 

Applications

• Pressure piping systems in building equipment and general industrial plants.
• Pump and turbine lines used for power generation plants, industrial machinery and universal pump blowers.
• Feed-water & drainage lines for waterworks & sanitary piping systems.
• Pipelines for industrial plants and shipbuilding yards.

 

Specifications: Twin Sphere Molded Rubber Expansion Joints (AJT Series)

ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE STATED

API Part Number	Size	Face To Face Dimensions	Allowable Motion Ratings* Compression	Allowable Motion Ratings* Elongation	Allowable Motion Ratings* Lateral	Allowable Motion Ratings* Angular	Installation Tolerances Compression	Installation Tolerances Elongation	Installation Tolerances Lateral	Installation Tolerances Angular
AJT0100**	1	5.00	2.00	1.00	1.75	45°	0.25	0.13	0.31	10°
AJT0125**	1.25	7.00	2.00	1.00	1.75	45°	0.25	0.13	0.31	10°
AJT0150**	1.5	7.00	2.00	1.00	1.75	45°	0.25	0.13	0.31	10°
AJT0200**	2	7.00	2.00	1.00	1.75	45°	0.25	0.13	0.31	10°
AJT0250	2.5	7.00	2.00	1.00	1.75	35°	0.25	0.13	0.31	10°
AJT0300	3	7.00	2.00	1.00	1.75	35°	0.25	0.13	0.31	10°
AJT0400	4	9.00	2.00	1.38	1.56	35°	0.25	0.13	0.31	10°
AJT0500	5	9.00	2.00	1.38	1.56	30°	0.25	0.13	0.38	10°
AJT0600	6	9.00	2.38	1.38	1.56	25°	0.25	0.13	0.38	8°
AJT0800	8	13.00	2.38	1.50	1.38	20°	0.25	0.13	0.50	5°
AJT1000	10	13.00	2.38	1.50	1.38	15°	0.25	0.13	0.50	5°
AJT1200	12	13.00	2.38	1.50	1.38	15°	0.25	0.13	0.50	5°
AJT1400	14	13.75	2.38	1.50	1.13	12°	0.25	0.13	0.31	4°
AJT1600	16	13.75	2.38	1.50	1.13	10°	0.25	0.13	0.31	4°
AJT1800	18	13.75	2.38	1.50	1.13	10°	0.25	0.13	0.31	3°
AJT2000	20	13.75	2.38	1.50	1.13	10°	0.25	0.13	0.31	3°
AJT2400	24	13.75	2.38	1.50	1.13	10°	0.25	0.13	0.50	3°

“*”- Non Concurrent Ratings. “**”- Sizes ≤ 2″ do not have root rings. Warning: Do NOT elongate Twin Sphere Molded Rubber Expansion Joints when installing for suction service.

Part Number Structure

Part Number Section	Options
Type	AJT = Twin Sphere Flanged Expansion Joint (Steel)
Size	XXXX = Size in inches going out 2 decimal places
Body Material	NE = Neoprene EP = EPDM BN = Buna-N/Nitrile/NBR
Flange Material	STL = Steel
Class	150 = 150# Drilling 300 = 300# DrillingP10 = DIN PN10 Drilling P16 = DIN PN16 Drilling
Example	AJT0200-NE-STL-150 = 2″ Twin Sphere Expansion Joint with Neoprene Body and Steel Flanges with 150# Drill Pattern

 

Operating Conditions

Size Range	1” – 12”	14” – 24” & 28″
Operating Pressure	up to 225 psi (up to 160°F)	up to 150 psi (up to 160°F)
Burst Pressure	900 psi (at 70°F)	600 psi (at 70°F)
Vacuum Rating*	26 in/hg	15 in/hg
Operating Temp. Range*	Neoprene: 14°F- 180°F EPDM: 14°F- 210°F Buna-N/Nitrile/NBR: 14°F- 180°F	Neoprene: 14°F- 180°F EPDM: 14°F- 210°F Buna-N/Nitrile/NBR: 14°F- 180°F

Warnings:

• Pressure ratings listed in the above table are for temperatures up to 160°F. For temperature service above 160°F, please contact API Sales for actual working pressure ratings.
• Limit rods are required in systems that are unanchored and recommended in all other applications.
• Not for use in steam applications.

 

Materials

Part	Part Description	Material
1	Flanges	Mild Steel – Plated
2	Reinforcement Cord	Nylon
3	Reinforcing Wire	Mild Steel
4	Tube	Synthetic Rubber
5	Cover	Synthetic Rubber
6	Root Ring	Mild Steel Plated