تعیین تجربی موقعیت نشتی گاز خط لوله فشار بالا با استفاده از روش نشرآوایی

نوع مقاله: مقاله علمی- ترویجی

نویسندگان

1 بازرسی فنی منطقه دو عملیات انتقال گاز ایران

2 مدیر عامل شرکت توسعه و تحقیق ایرانیان (تتا)

چکیده

در این تحقیق تعیین قابلیت آزمون نشرآوایی (آکوستیک امیشن[i]) در تعیین محل نشتی گاز در خط لوله انتقال گاز سراسری ایران با قطر خارجی56 اینچ و فشار psi1050، ارزیابی شد. با توجه به اعلام گزارش وجود نشتی ppm1500 در لوله به طول 8/37 متر محصور داخل غلاف بتنی(ccw[ii])، با عنایت به گازدار بودن خط لوله، عدم امکان قطع جریان و همچنین هزینه بالای تخریب غلاف بتنی، با استفاده از آزمون نشرآوایی، احتمال وجود نشتی در غلاف بتنی و تخمین موقعیت آن ارزیابی شد. در این آزمون در دو سر لوله خارج از غلاف بتنی با نصب حسگرهای پیزوالکتریک عملیات داده­برداری جهت شناسایی منابع صوتی ناشی از نشتی موجود انجام شد. پس از مکان‌یابی داده­های دریافتی با توجه به مشخصات اصلی سیگنال نشتی یعنی RMS و زمان ماندگاری، محل نشتی ردیابی و شناسایی شد. نتایج آزمون حاکی ازعدم وجود نشتی گاز در غلاف بتنی بوده و موقعیت نشتی در محلی خارج از آن شناسایی گردید. با حفاری محل تخمین زده شده توسط نشرآوایی ، نشتی موجود در سر جوش محیطی[iii]، به علت ترک طولی بر روی جوش در ساعت 6 لوله مشاهده شد. که پس از تخلیه گاز خط لوله، جوش تعمیر و هیچ آسیبی به غلاف بتنی وارد نشد.



[i]. Acoustic Emission


[ii]. Concrete Coating Weight


[iii]. Girth Weld

کلیدواژه‌ها

موضوعات


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