## Mill hydro test pressure per ASTM A530 for A106 pipes

## Mill hydro test pressure per ASTM A530 for A106 pipes

(OP)

What seems to be the intend of the hydro test specified through the below, Is it not a strength test. At 2500 psi, it does not seem to be.

"22. Hydrostatic Test Requirements

22.1 Except as provided in 22.2 and 22.3, each length of

pipe shall be tested by the manufacturer to a hydrostatic

pressure which will produce in the pipe wall a stress not less

that 60 % of the minimum specified yield strength for carbon

and ferritic alloy steel pipe, or 50 % of the specified minimum

yield strength for austenitic alloy steel pipe. The test pressure

or stress shall be determined by the following equation:

P 5 2St/D or S 5 PD/2t (3)

where:

P = hydrostatic test pressure in psi or MPa,

S = pipe wall stress in psi or MPa,

t = specified nominal wall thickness, nominal wall thickness

corresponding to specified ANSI schedule number,

or 1.143 times the specified minimal wall thickness,

in. [mm], and

D = specified outside diameter, outside diameter corresponding

to specified ANSI pipe size, or outside

diameter calculated by adding 2t (as defined above) to

the specified inside diameter, in. [mm].

22.1.1 The hydrostatic test pressure determined by the

equation shall be rounded to the nearest 50 psi [0.5 MPa] for

pressures below 1000 psi [7 MPa], and to the nearest 100 psi

[1 MPa] for pressures 1000 psi [7 MPa] and above. The

hydrostatic test may be performed prior to cutting to final

length, or prior to upsetting, swaging, expanding, bending, or

other forming operations.

22.2 Regardless of pipe-wall stress-level determined by Eq

3, the minimum hydrostatic test pressure required to satisfy

these requirements need not exceed 2500 psi [17.0 MPa] for

outside diameters (see D in 22.1) of 3.5 in. [88.9 mm] or less,

nor 2800 psi [19.0 MPa] for outside diameters over 3.5 in.

[88.9 mm]. This does not prohibit testing at higher pressures at

the manufacturer’s option or as provided in 22.3.

22.3 With concurrence of the manufacturer, a minimum

hydrostatic test pressure in excess of the requirements of 22.2

or 22.1, or both, may be stated on the order.

22.4 The test pressure shall be held for a minimum of 5 s,

without resultant leakage through the pipe wall. For welded

pipe, the test pressure shall be held for a time sufficient to

permit the inspector to examine the entire length of the welded

seam."

"22. Hydrostatic Test Requirements

22.1 Except as provided in 22.2 and 22.3, each length of

pipe shall be tested by the manufacturer to a hydrostatic

pressure which will produce in the pipe wall a stress not less

that 60 % of the minimum specified yield strength for carbon

and ferritic alloy steel pipe, or 50 % of the specified minimum

yield strength for austenitic alloy steel pipe. The test pressure

or stress shall be determined by the following equation:

P 5 2St/D or S 5 PD/2t (3)

where:

P = hydrostatic test pressure in psi or MPa,

S = pipe wall stress in psi or MPa,

t = specified nominal wall thickness, nominal wall thickness

corresponding to specified ANSI schedule number,

or 1.143 times the specified minimal wall thickness,

in. [mm], and

D = specified outside diameter, outside diameter corresponding

to specified ANSI pipe size, or outside

diameter calculated by adding 2t (as defined above) to

the specified inside diameter, in. [mm].

22.1.1 The hydrostatic test pressure determined by the

equation shall be rounded to the nearest 50 psi [0.5 MPa] for

pressures below 1000 psi [7 MPa], and to the nearest 100 psi

[1 MPa] for pressures 1000 psi [7 MPa] and above. The

hydrostatic test may be performed prior to cutting to final

length, or prior to upsetting, swaging, expanding, bending, or

other forming operations.

22.2 Regardless of pipe-wall stress-level determined by Eq

3, the minimum hydrostatic test pressure required to satisfy

these requirements need not exceed 2500 psi [17.0 MPa] for

outside diameters (see D in 22.1) of 3.5 in. [88.9 mm] or less,

nor 2800 psi [19.0 MPa] for outside diameters over 3.5 in.

[88.9 mm]. This does not prohibit testing at higher pressures at

the manufacturer’s option or as provided in 22.3.

22.3 With concurrence of the manufacturer, a minimum

hydrostatic test pressure in excess of the requirements of 22.2

or 22.1, or both, may be stated on the order.

22.4 The test pressure shall be held for a minimum of 5 s,

without resultant leakage through the pipe wall. For welded

pipe, the test pressure shall be held for a time sufficient to

permit the inspector to examine the entire length of the welded

seam."

## RE: Mill hydro test pressure per ASTM A530 for A106 pipes

You can't use hydro as a nondestructive strength test, if you use high enough pressures to verify strength you will be deforming the product.

= = = = = = = = = = = = = = = = = = = =

Plymouth Tube

## RE: Mill hydro test pressure per ASTM A530 for A106 pipes

Why is that the mill test pressure required much lesser. The term 5 in the formula is not understood.

Is a strength test a destructive test that will deform beyond the elastic limits?

## RE: Mill hydro test pressure per ASTM A530 for A106 pipes

## RE: Mill hydro test pressure per ASTM A530 for A106 pipes

## RE: Mill hydro test pressure per ASTM A530 for A106 pipes

## RE: Mill hydro test pressure per ASTM A530 for A106 pipes