A reward of 500 wealth points is offered for an answer regarding the definition of a single-piece top-mounted ball valve!
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I’m facing an issue in the bidding process: the tender document requires a single-piece top-mounted ball valve with flange connection； The manufacturer uses a single-piece top-mounted ball valve, but the flange and the valve body are connected by welding ； However, after submitting the bid, the client rejected it on the grounds that the flange and valve body had to be forged as a single unit ； I checked various relevant domestic and international standards, but none provided an accurate description; no precise definition of the connection method between the flange and the valve body could be found in the standards for top-mounted ball valves ； Those who can provide relevant standards or authoritative information are requested to answer this question. Accurate and authoritative materials are required; 500 wealth points will be added upon adoption ；
Misinterpretation of the problem: Xiao Ming is hungry and asks someone else to buy steamed buns for him; Li buys plain wheat flour steamed buns. Xiaoming refused it on the grounds that the steamed buns had to be made with kneaded dough; is there any regulation for this? The claims made by the owner were also put forward by them during previous bidding processes; they explained that welding makes the structure stronger and more durable. Party A had no solution, and in the end, the bid was rejected on the grounds that Party A could not be trusted. As a bidder, there is no real need to delve deeply into the employer’s practices; what has been done meets the load specifications and there is a track record of successful projects, so it’s impossible to ignore the tendering party’s misinterpretations. It’s impossible to guarantee winning every bid.
I really couldn’t find any information on this. By the way, I’d like to add that this isn’t the main reason why you didn’t win the bid; factors such as price, communication prior to bidding, and after-sales service also play a role.
Perhaps it’s just a far-fetched excuse concocted by the owner to reject the bid
Check the standards adopted in the tender documents as well as the technical requirements of those documents.
Check the standards adopted in the tender documents as well as the technical requirements of those documents. Follow the standards and requirements strictly.
Design specifications for top-mounted ball valves: API 6A, API 6D, ANSI B16.34, BS 5351. Structural length: ANSI B16.10. Connection standards: ANSI B16.5. Body materials: carbon steel, stainless steel, alloy steel. Pressure testing: API 598. Pressure range: Class 600–1500. Diameter: 2″–12″. The valve features a monolithic body design with upper-mounted pivot-mounted support; it has a flange structure as well as a pivot-mounted ball stem. It offers a dual-block and bleed function, along with a high-strength monolithic ball stem structure.
It’s just used to introduce this technical discussion, without considering other reasons for disqualification! Thank you!
The tender documents do not require an integral valve body; only a top-mounted single unit is specified. No relevant provisions can be found in the standard specifications
I have checked API6D and ANSI B16.34, but found no relevant information； For the single-piece top-mounted design, there are only 3 structural diagrams for reference; it is not specified whether the valve body and the flange must be forged or cast as one unit – it is only stated that the valve body can be cast, forged, or welded together, with no detailed description provided! The bid only mentions single-piece top-mounted ball valves, with no requirement for a flange integrated with the valve body ；
Indeed, if we set aside these factors and focus solely on the technical aspects, we hope to find a professional and authoritative response