GB 5310-2008 Seamless steel tubes and pipes for high pressure boiler (Text of Document is in English)

01/10/2009

25P

$96.00 USD

5. Size, Shape and Weight

5.1 Outside Diameter and Wall Thickness
5.1.1 Steel tube shall be delivered according to nominal outside diameter and nominal wall thickness unless otherwise stated in this contract. According to the buyers' requirements and through the negotiation by the buyer and the seller, steel tube may be delivered according to nominal outside diameter and minimum wall thickness, nominal inside diameter and nominal wall thickness or other dimensions.
5.1.2 Nominal outside diameter and wall thickness of steel tube shall meet the requirements of GB/T 17395. According to the requirements of the buyer and through negotiation by the buyer and the seller, the steel tubes with other nominal outside diameter and wall thickness beyond GB/T 17395 may be supplied.
If the steel tubes are delivered according to nominal inside diameter and nominal wall thickness, their dimensions shall be determined by the buyer and the seller.
Note: if there is no specific explanation, the said wall thickness (PREFIX = V ) in this standard contains nominal wall thickness and minimum wall thickness; while the said outside diameter ( ) contains nominal outside diameter and calculation outside diameter.
5.1.3 If the steel tubes are delivered according to nominal outside diameter and nominal wall thickness, allowable deviation of their nominal outside diameter and nominal wall thickness shall meet the requirements of Table 1.
If the steel tubes are delivered according to nominal outside diameter and minimum wall thickness, the allowable deviation of their nominal outside diameter shall meet the requirements of Table 1; while the allowable deviation of wall thickness shall meet the requirements of Table 2.
If the steel tubes are delivered according to nominal inside diameter and nominal wall thickness, allowable deviation of their nominal inside diameter is ±1.0% ; and the allowable deviation of nominal wall thickness shall meet the requirements of Table 1.
5.1.4 If allowable deviation grade of steel tube dimension is not indicated by the buyer in the contract, the allowable deviation of outside diameter and wall thickness of steel tube shall meet the requirements of ordinary grade.
According to the requirements of the buyer and through negotiation by the buyer and the seller, other steel tubes within the allowable deviation may be supplied beyond those specified in Table 1 and Table 2. or steel tubes with other inside diameter allowable deviation may also be supplied. All these shall be indicated in the contract.