SPM EXL翼形螺母

SPM EXL翼形螺母正在申请专利，其设计旨在降低导致传统翼形螺母故障的重力，同时提供可实施在新的和使用中的客户资产上的解决方案。

产品概述

设计挑战

翼形螺母故障有两个主要来源：周期性负荷引起的疲劳裂纹和锤击产生的过大负载冲击。与泵送操作期间产生的典型脉动相配合的连续侧向载荷力对铁锤设备产生显着的应力水平。因此，疲劳裂纹形成可能发生在螺纹根部，其可以轴向传播并导致意外的分离。

解决方案

SPM EXL翼形螺母正在申请专利，有助于从源头解决故障，并在内螺纹上具有全根半径，以帮助小化应力浓度。这种设计特征还有另外的益处，即增大间隙以增加螺纹中积聚的碎屑，有助于正确组装。向前延伸的稠化剂凸耳与较大的外径配对可通过抑制传播路径减少裂纹，并提供更大的表面积来吸收铁锤冲击载荷。 SPM EXL翼形螺母可以改进现有的SPM产品，并且与大多数现有的具有相当尺寸和压力等级的铁锤联接头兼容。

设计确认

SPM EXL翼形螺母的设计旨在使关键位置的应力浓度小化。通过综合分析证实，该设计减少的疲劳应力导致故障前的循环增加了235%。这种疲劳分析主要基于1500 lb. 交替侧向载荷。

应用

压裂

固井

油井服务

关于鼎恒石油

四川鼎恒石油是Weir SPM的授权代理商，若需要购买SPM产品或需要了解产品详细参数及相关疑问，可直接进入鼎恒石油官网咨询网站客服或者拨打销售热线18000522697。

四川鼎恒石油机械设备有限公司(http://www.dinghengot.com)是一家拥有进出口经营权，长期从事国内外石油天然气设备和配件的专业销售公司。鼎恒石油公司总部设在四川成都，在加拿大大不列颠哥伦比亚省成立了分公司。我公司与多家世界知名制造厂商建立了紧密的合作关系。

注：该文章由鼎恒石油编译，转发须注明出处。

附英文原文：

SPM® EXL Wing Nut

The patent pending SPM® EXL wing nut is designed to reduce stresses that have been a cause of legacy wing nut failures, while providing a solution that can be implemented on new and in-use customer assets.

Overview

Design Challenges

There are two primary sources of wing nut failure: fatigue cracks from cyclical loading and excessive load impact from hammer strikes. Continual side load forces paired with the typical pulsations produced during pumping operations create significant levels of stress on hammer unions. Consequently, fatigue crack formations may develop at the thread root which can propagate axially and lead to an unexpected separation.

The Solution

The patent pending SPM® EXL wing nut helps address failures at their source and features a full root radius on the internal threads to help minimize stress concentrations. This design feature also provides the additional benefit of added clearance for debris accumulation in the threads, assisting with proper assembly. Thicker lugs that extend forward, paired with a larger outside diameter, reduce cracking by suppressing the propagation path and provide a greater surface area to absorb hammer impact loads. The SPM® EXL wing nut can be retrofitted to existing SPM® product and is compatible with most existing hammer union connections of comparable size and pressure rating.

Design Validation

The SPM® EXL wing nut is engineered to minimize stress concentrations at critical locations. A comprehensive analysis confirmed the design reduced fatigue stress resulting in a 235% increase in cycles prior to failure. This fatigue analysis is based on 1,500 lb. alternating side load.

Applications

Fracking

Cementing

Well Service