MSS SP-44 covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for steel pipeline flanges.

MSS SP-44涵蓋了鋼製管道法蘭的壓力溫度額定值、材料、尺寸、公差、標記和測試。

MSS SP-44 is the standard for high-strength, cold-worked, carbon steel grade welding for pipelines. It provides guidelines for the design, manufacturing, and testing of flanges used in pipeline systems.

MSS SP-44是管道高強度冷加工碳鋼級焊接的標準。它為管道係統中使用的法蘭的設計、製造和測試提供了指導方針。

The flanges covered by MSS SP-44 range in size from NPS 12 to NPS 24, and they are equivalent to ASME B16.5 flanges. Additionally, MSS SP-44 also covers flanges larger than NPS 26, which are known as ASME B16.47 Series A flanges.

MSS SP-44涵蓋的法蘭尺寸範圍為NPS 12至NPS 24，與ASME B16.5法蘭相當。此外，MSS SP-44還涵蓋了大於NPS 26的法蘭，即ASME B16.47 A係列法蘭。

It is important to note that MSS SP-44 is the only source for NPS 22 flange dimensions.

值得注意的是，MSS SP-44是NPS 22法蘭尺寸的唯一來源。

The standard inlcudes all the flange types in forged steel or steel inlcudes Weld Neck Flange, Slip On Flange, Lap Joint Flange and Blind flanges and etc.

該標準涵蓋了鍛鋼或鋼製的所有法蘭類型，包括焊接頸法蘭、滑動法蘭、搭接法蘭和盲板法蘭等。

Dimensional and tolerance requirements for NPS 10 and smaller flanges in this standard refer to ASME B16.5. 

本標準中NPS 10及以下法蘭的尺寸和公差要求參見ASME B16.5

Pressure Temperature Ratings壓力溫度額定值

Flanges understand the standard has follwing pressure ratings: Class 150, 300, 400, 600 or 900.法蘭知道該標準具有以下壓力等級：150、300、400、600或900級。

Sizes尺寸

NPS and DN as follows:NPS和DN如下：

Materials of MSS SP-44MSS SP-44的材料

All materials used for making MSS SP-44 flanges shall be "killed" steel. It shall be suitable for field welding to other flanges, fittings, or pipe manufactured according to ASTM A105, A53, A106, A350, A381, A516, A537, A694, A707 and API 5L.

用於製造MSS SP-44法蘭的所有材料應為“鎮靜”鋼。它應適用於現場焊接至根據ASTM A105、A53、A106、A350、A381、A516、A537、A694、A707和API 5L製造的其他法蘭、配件或管道。

It defines maximum carbon content of 0.30%, and CE shall not exceed 0.48%, based on ladle analysis, without prior approval of the purchaser. If the CE exceeds 0.45%, the flange shal be marked with actual CE result. All test methods shall be as specified in ASTM A370.

根據鋼包分析，未經買方事先批準，其規定的最大碳含量為0.30%，CE不得超過0.48%。如果CE超過0.45%，法蘭上應標記實際CE結果。所有試驗方法應符合ASTM A370的規定。

Chemical Composition化學成分

Table 1

Tensile Requirements of MSS SP-44MSS SP-44的拉伸要求

Tensile Requirements拉伸要求

SI (Metric) and U.S. CustomarySI（公製）和美國慣用單位

Impact Test衝擊試驗

Impact testing is not required for Grade F42 and lower. F42級及以下不需要進行衝擊試驗。 

From each steel sheet, one set (three specimens) shall be tested at a maximum temperature of -45℃ (-50℉) and show 27J (20ft-lb) minimum average, 20J (15 ft-lb) individual minium.

從每塊鋼板中，應在-45℃（-50℉）的最高溫度下對一組（三個試樣）進行測試，並顯示最小平均值27J（20ft-lb），單個最小值20J（15ft-lib）。

Hardness硬度

Hardness shall be HBW 235 as maximum.

硬度最大應為HBW 235。

Bolting螺栓連接

Boltings listed in Table 3 shall be used in flanged joints covered by MSS SP-44. Bolting produced from other materials may be used if permitted by the applicable code or governmental regulation. 

MSS SP-44涵蓋的法蘭接頭應使用表3中列出的螺栓。如果適用規範或政府法規允許，可以使用其他材料製成的螺栓。 

Heat Treatment熱處理

MSS SP-42 F42 and higher grades shall be normalized, normalized and tempered, quenched and tempered, or precipitation treated and aged. Class 400 and higher classes of Grade F36 flanges shall be anneald, normalized, normalized and tempered, or quenched and tempered as defined in ASTM A961; But the minimum tempering temperature shall be 540℃ (1000℉).

MSS SP-42 F42及更高等級應進行正火、正火和回火、淬火和回火，或沉澱處理和時效。400級及以上F36級法蘭應按照ASTM A961的規定進行退火、正火、正火和回火，或淬火和回火；但最低回火溫度應為540℃（1000℉）。

MSS SP-44 Flange Design Spec  MSS SP-44法蘭設計規範

Tolerances 公差

Drilling template鑽孔模板

The flange drilling template is determined as follows:法蘭鑽孔模板確定如下：

The Class 150 flange drilling template is identical to the Class 125 in ASME B16.5 and ASME B16.1.

150級法蘭鑽孔模板與ASME B16.5和ASME B16.1中的125級相同。

The drilled template for class 300 flanges smaller than or equal to NPS24 is the same as that for class 250 flanges in ASME B16.5 and ASME B16.1. The drilled templates for class 400, class 600, and class 900 flanges in sizes less than or equal to NPS24 are the same as those for ASME B16.5.

小於或等於NPS24的300級法蘭的鑽孔模板與ASME B16.5和ASME B16.1中的250級法蘭的模板相同。尺寸小於或等於NPS24的400級、600級和900級法蘭的鑽孔模板與ASME B16.5的鑽孔模板相同。

The NPS 26 through NPS 60 Class 150, 300, 400, 600, and 900 flanges are the same as those of series A flanges in ASME standard B16.47.

NPS 26至NPS 60 150、300、400、600和900級法蘭與ASME標準B16.47中的A係列法蘭相同。

Flange Ring design法蘭環設計

For flanges with nominal pipe diameter less than or equal to NPS24, the outer diameter and flange thickness shall meet the requirements of ASME B16.5. For flanges with nominal pipe diameters of NPS26 through NPS60, the outer diameter and flange thickness shall comply with the requirements of ASME B16.47 for series A flanges

對於公稱管徑小於或等於NPS24的法蘭，外徑和法蘭厚度應符合ASME B16.5的要求。對於公稱管徑為NPS26至NPS60的法蘭，外徑和法蘭厚度應符合ASME B16.47對A係列法蘭的要求

Hub Design樞紐設計

ASME B16.5 and B16.47 weld flange ratings are based on the weld flange neck and have a calculated wall thickness at least equal to the pipe. The pipe has a specified minimum yield strength of 276 MPa (40000 psi) and a maximum bore size.

輪轂設計ASME B16.5和B16.47焊接法蘭額定值基於焊接法蘭頸部，計算壁厚至少等於管道。該管道的規定最小屈服強度為276 MPa（40000 psi），最大孔徑為。

NPS 60 and Smaller   NPS 60及以下

When the mechanical properties (minimum yield strength) of the various parts are equal to or greater than the line to which it is connected, the flange neck may be the same size as specified in the ASME B16.5 or 16.47A series.

當各部件的機械性能（最小屈服強度）等於或大於其連接的管線時，法蘭頸的尺寸可以與ASME B16.5或16.47A係列中規定的尺寸相同。

Marking標記

Flanges shall be marked in accordance with the rules specified in MSS Standard Practice SP-25. In addition, the letter PL should be added before the level symbol. The grade symbol on the weld neck flange marks the material grade of the weld flange neck.

法蘭應按照MSS標準規程SP-25中規定的規則進行標記。此外，字母PL應添加在電平符號之前。焊接法蘭上的等級符號標記了焊接法蘭頸部的材料等級。

Facing外裝

The accuracy of the pipe flange contact surface should be determined by the visual comparison method using the Ra sample block instead of the stylus plotter and the electronic magnifier.

管道法蘭接觸麵的精度應通過使用Ra樣品塊而不是觸針繪圖儀和電子放大器的視覺比較法來確定。

Raised Face 凸麵

It provide concentric serrated or helical teeth with an accuracy between 3.2 μm (125 μinch) and 6.3μm (250μinch). The cutting tool used shall have a radius greater than or equal to 1.5mm (0.06 in) and 1.7 to 2.2 grooves per mm (44 to 55 grooves per inch).

它提供同心鋸齒或螺旋齒，精度在3.2μm（125μ英寸）至6.3μm（250μ英寸）之間。所用切削刀具的半徑應大於或等於1.5mm（0.06英寸），每毫米1.7至2.2個凹槽（每英寸44至55個凹槽）。

Ring Joint環形密封麵型

The side surface roughness of gasket groove shall not exceed 1.6μm （63μinch）.

墊片槽的側麵粗糙度不得超過1.6μm（63μin）。

Flange Testing翻邊

Hydrostatic test of the flange is not required. However, the hydrostatic pressure test of the flange joint may be carried out at a pressure not exceeding 1.5 times the 38 ° C (100 ° F) rating.

無需對法蘭進行靜水壓試驗。但是，翻邊的靜水壓試驗可以在不超過38°C（100°F）額定值1.5倍的壓力下進行。