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ASTM D4161 Coupling leakage hydrostatic pressure test for GRP fiberglass Pipe Joints seals

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ASTM D4161: Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe Joints Using Flexible Elastomeric Seals


ASTM D4161 specification covers axially unrestricted socket gasket joints, including joints required for mechanically fabricated 'fiberglass' (glass fiber reinforced thermoset resin) piping systems, ranging from 8 inches (200 mm) to 156 inches (4000 mm), using flexible elastomeric seals to ensure tightness. The piping systems can be pressure (typically up to 250 psi) or non-pressure systems, used for water, chemicals, or gases that are non-corrosive to the materials specified in this specification. 


Joint type and structural characteristics:

This standard specification covers two types of axial unrestrained fittings, both of which achieve joint seal integrity through elastomer seal compression:

Joint typeSealing ring positionCompression methodApplicable scenarios
Socket fittingsCircumferential compression inside the   socketRadial compressionStandard pressure piping
Push-in fittingsThe socket is stretched outward and   peripherallyRadial compressionQuick installation occasions
Coupling connectorsDouble socket socketBidirectional compressionPipeline connection transition


Laboratory performance testing requirements

All tests must be performed on components that provide minimal sealing compression, and hydrostatic pressure testing pressures are twice the rated pressure (pressure pipe) or 29 psi (200 kPa) (pressureless pipes).

Test typeTest conditionsEligibility criteriaTest time
Angular deflection test

The deflection angle is specified according to the pipe diameter.

ASTM D4161 Coupling leakage hydrostatic pressure test for GRP fiberglass Pipe Joints seals

No leakage10 minutes
Lateral offset test100 lb/in diameter loadNo leakage10 minutes
Vacuum/external pressure test11.6psi external pressure or vacuumPressure increase ≤ 0.1 psiSeal for 10 minutes

Angular deflection testing has specific requirements according to different pipe diameters: 20 inches and below pipes have a deflection angle of 3°, 20-33 inches is 2°, 33-60 inches is 1°, and more than 60 inches is 0.5°. 

ASTM D4161 Coupling leakage hydrostatic pressure test for GRP fiberglass Pipe Joints seals



Related products and device

ASTM D4161 GRP Pipe Hydrostatic Pressure Testing Machine

hydrostatic pressure testing machine is designed according to ISO 1167, ASTM D1598, ASTM D1599. Under a stipulated constant hydrostatic pressure force, keeping provision time; or inside the pipe, apply a constant and rapid hydraulic pressure to make the specimen broken in a short period time, check the max. pressure force, then calculate the ring stress.

ASTM D4161 GRP Hydrostatic pressure constant temperature tank​

Constant temperature water tank is a crucial piece of equipment for hydrostatic pressure tests, particularly for long-term and burst tests. It is designed to maintain a constant pressure and temperature during testing, which is essential for accurately assessing the strength and durability of pipe.

ASTM D4161 GRP End cap of pipe pressure test

Stainless Steel End Caps For Pipe Hydrostatic Pressure and Burst Testing are designed for internal hydrostatic pressure testing of pipes and fittings. It is used to seal the sample in order to generate internal pressure in the sample, with the characters: ISO 1167 Type A structure.

ASTM D4161 Piping System Joints Sealing Leak Tightness Tester

Piping System Joints Leak Tightness Tester it is used to determine the maximum negative pressure value of thermoplastic pipe and composite pipe, and is a necessary testing equipment for plastic pipe manufacturers and testing institutions.

Related Standard

ASTM D1598 test for long-term hydrostatic pressure of plastic pipe

ASTM D1598 is a standard test method that determines the time-to-failure of thermoplastic and reinforced thermosetting/resin pipes under constant internal pressure at a controlled temperature, which is critical for establishing hydrostatic design basis and ensuring long-term pipeline reliability.

ASTM D1599 Pipe short-time hydraulic burst pressure test

ASTM D1599 is titled "Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings." It is a fundamental short-term, destructive pressure test used to determine the ultimate failure pressure (often called the "burst pressure") of thermoplastic pipe, tubing, or fittings under rapidly applied internal pressure at a specified temperature. Typically completed within 60–70 seconds, mainly for quality control and short-term design validation. 

ASTM D1598, D1599 Plastic Pipe Constant or short time pressure testing methods

ASTM D1598: Standard Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure.

ASTM D1598 test method covers the determination of the time-to-failure of both thermoplastic and reinforced thermosetting/resin pipe under constant internal pressure.This test method provides a method of characterizing plastics in the form of pipe under the conditions prescribed.


ASTM D1599: Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings.

ASTM D1599 test method establishes the short-time hydraulic failure pressure of thermoplastic or reinforced thermosetting resin pipe, tubing, or fittings. Data obtained by this test method are of use only in predicting the behavior of pipe, tubing, and fittings under conditions of temperature, time, method of loading, and hoop stress similar to those used in the actual test. They are generally not indicative of the long-term strength of thermoplastic or reinforced thermosetting resin pipe, tubing, and fittings


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