corrosion coupon

Corrosion coupon are a very inexpensive and common method for checking the corrosion rate in water, oil and gas equipment.  This disposable part provides a high precision in determining the corrosion rate of the equipment for inspectors and operators. In addition, the use of coupons will be useful in recognizing the corrosion type of the equipment. .

Coupons made by Mirab Sanat Industries are as follows:

Strip corrosion coupons

Disk and  Flush Disk coupons

Scale corrosion coupons

Wheel Test Coupons

  • Strip corrosion coupons

The most common type of coupon is the strip corrosion coupon. These types of coupons have the highest contact levels compared to other coupons, and due to high contact levels, corrosion and weight loss mechanisms are more visible. Its dimensions typically as bellow:

Strip type( 3 inch):

76.2 x 19 x 3.2 mm (3 x 1 x 1/8 inches). Usually these coupons have two holes for mounting and the surface is in good contact for a corrosion test of about 3000 mm².

Strip type( 2 inch or china type):

50.8 x 19 x 3 mm (3 x 1 x 1/8 inches). Usually these coupons have two holes for mounting and the surface is in good contact for a corrosion test of about 2000 mm².

Strip type( 3 inch narrow type):

In cases where the pipe size do not let the common coupons the narrow type coupons are used. This coupons has the dimension of  76.2 x 12.7x 1.6 mm (3 x ½ x1/16 inches). c

Strip corrosion coupon
Strip corrosion coupon
Strip corrosion coupon
Strip corrosion coupon

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  •  Disk and  Flush Disk corrosion coupons

Disc Coupons

These coupons are used to simulate the movement of fluid in the wall of the pipes and their dimensions are ∅ 31.8 × 3.2 mm (1.25 × 1/8 inches). The effective contact surface in these coupons is 1700 mm² and in the middle of the hole for easy opening and closing. Multi-phase systems use multi-coupon systems to examine different phases.

Flush Disk corrosion coupons

industries uses this type of coupons in places that can not be used with regular coupons, and the interference generated in the flow of the line is unacceptable. Their standard dimensions are ∅ 31.8 × 3.2 mm (1.25 × 1/8 inches). The effective contact level in these coupons is 1500 mm².

coupon-disc
coupon disc
Flush disk coupon
Flush disk coupon

جهت مشاهده این صفحه به زبان فارسی کلیک کنید

  • Scale corrosion coupons

These types of coupons are generally used to check the formation velocity and sediment type in pipes that are likely to form sediments. In general, they can also be used to determine the time required for pigging intervals. These coupons generally have two hole rows of six holes per row, each with a maximum diameter of 30% of the coupling width and a minimum of 0.5 mm.

جهت مشاهده این صفحه به زبان فارسی کلیک کنید

  •  Wheel Test Coupons

This type of coupons are used in wheel test machine with the commandeered dimension of 75.4×12.5×0.127 mm (3 × ½ × 0.005 inch).

wheel test coupon
wheel test coupon

wheel test couopon

جهت مشاهده این صفحه به زبان فارسی کلیک کنید

Material type

Usually coupons are made of low-carbon steel, stainless steel, copper, bronze, brass and Inconel. Nevertheless, Mirab Industries declares its readiness to design and build coupons with other materials on the order of the buyer.

Material typeAlloySimilar name
Low carbon steelAISI 1010ASTM A512/St12
Low carbon steelAISI 1018ASTM A512/St37
Low carbon steelAPI 5L
Low carbon steelASTM A106
Low carbon steelSAE 30418/8
Stainless steelSAE 31618/10
Cupro-nickel, 90/1090/10
TitaniumTi-Al6-4V
Aluminiumserries 6xxx and 2xxx

Other coupon properties

Coupons, according to the buyer’s request, can have two roughness classes:

Preparation techniqueStandard featureSurface roughness (Ra- µm)
As received NACE No. 1/SSPC-SP50.5-1
Blasted NACE No. 1/SSPC-SP100.6-1.4
Polished NACE No. 1/SSPC-SP50.2-0.8
  • All coupons have a laser hacked code and coupon code on the body.
  • All coupons are annealed before cutting to eliminate the cold work .
  • All coupons are produced by water and wire cut and are not punched.
  • All coupons are carefully weighted and then packed up to four digits.
  • All coupons are packed in double layer (VCI bag) and have one year expiration date.
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