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9.1 General Requirements

Couplings shall be seamless, be of the same grade and type and the same PSL, or higher, as the pipe and be given the same heat treatment as the pipe, except as provided in 9.2.

Couplings shall be machined from coupling blanks made from coupling stock, coupling material or hot forgings except Grades C110 and Q125 couplings which shall not be made from hot forgings.

For Grade C110 coupling blanks heat-treated individually, only method 10.2.3 c) shall be used. See K.4 (SR 9) for optional requirements for Grades C110 and Q125 coupling blanks.

When couplings are electroplated, the electroplating process should be controlled to minimize hydrogen absorption.

9.2 Alternative Grades or Heat Treatments

9.2.1 When heat treatment is not stipulated in the purchase agreement, Grade H40 pipe shall be furnished with Grade H40, J55, or K55 couplings which are either as-rolled, normalized, normalized and tempered, or quenched and tempered.

9.2.2 When heat treatment is not stipulated in the purchase agreement, Grade J55 pipe shall be furnished with Grade J55 or K55 couplings which are either as-rolled, normalized, normalized and tempered, or quenched and tempered.

9.2.3 When heat treatment is not stipulated in the purchase agreement, Grade K55 pipe shall be furnished with Grade K55 couplings which are either as-rolled, normalized, normalized and tempered, or quenched and tempered.

9.2.4 Grade J55 EU tubing shall be furnished with Grade L80 Type 1 special clearance couplings when specified in the purchase agreement.

9.2.5 Grades J55 and K55 buttress casing shall be furnished with Grade L80 Type 1 couplings when specified in the purchase agreement.

9.2.6 Normalized Grade N80 Type 1 pipe shall be furnished with either Grade N80 Type 1 or N80Q couplings.

9.2.7 Normalized and tempered Grade N80 Type 1 pipe shall be furnished with either normalized and tempered Grade N80 Type 1 or N80Q couplings.

9.2.8 Grades N80 Type 1 and N80Q EU tubing shall be furnished with Grade P110 special clearance couplings when specified in the purchase agreement.

9.2.9 Grades N80 Type 1 and N80Q buttress casing shall be furnished with Grade P110 couplings when specified in the purchase agreement.

9.2.10 Grade P110 buttress casing shall be furnished with Grade Q125 couplings when specified in the purchase agreement.