Wedge wire screen quality and documentation

Wedge wire screen quality system

SIMO Screens works to an ISO 9001:2015 quality management system covering enquiry review, drawing control, purchasing and material identification, welding, fabrication, inspection and dispatch. Every order follows the same documented route from the approved drawing to the packed screen.

The certificate is held in the former company name, SIMO Screens Private Limited, and a copy is shared with quotations or on request.

Water well screens to IS 8110:2019

Our water well screens are made to IS 8110:2019, the Bureau of Indian Standards specification for well screens and slotted pipes, which gives tube well and borewell buyers a recognised basis for specification and inspection. The design method is covered in the water well screen design guide.

Material control and the mill test certificate

Incoming wire, rod, plate and pipe are checked against their mill certificates, identified and stored apart by grade, so that the alloy recorded on the Mill Test Certificate is the alloy in the finished screen. The MTC is supplied with every product and records chemical composition and mechanical properties, and EN 10204 type 3.1 certificates are supplied where specified.

Profile wire is formed in house to SIMO profile codes, which fix the shape, head width and height of each wire. Dimensions are checked with calibrated micrometers before welding.

Slot control and tolerance

Slot is checked with feeler gauges at welding set-up, during the welding run and at the end of each screen. Optical measurement is used where a physical gauge cannot be used.

The standard slot tolerance is plus or minus 5 percent of the nominal slot, stated on the drawing. The final inspection report records the minimum, maximum and mean slot, and each screen is released only when these readings fall within the stated tolerance.

Inspection stages

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Fabrication welds are visually inspected, and dye penetrant testing to ISO 3452 or ASTM E165 is carried out wherever it is specified. Methods, frequencies and records for each stage are set out in the inspection and testing plan.

Marking and traceability

Each screen is identified by a QR-coded tag carrying its job number, item and slot, and is laser marked on the screen where the client requires it. Heat numbers remain traceable from the MTC to the finished screen.

Services through approved agencies

The following are arranged on request through approved agencies, under SIMO quality control:

• Positive material identification (PMI) of wire, rod and fabricated parts
• Pickling and passivation to ASTM A380 or ASTM A967, and electropolishing
• Chrome plating of pressure screen baskets
• Dynamic balancing of centrifuge baskets

Documents

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Customer and third-party witness inspection can be arranged on request at agreed points. The content of each document and how to check it on receipt are explained in the quality documentation guide.